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Lacustrine Basin Fills in an Early Cretaceous Half-Graben, Jiuquan Basin, NW China: Controlling Factors and Implications for Source Rock Depositional Processes and Heterogeneity
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作者 Chengcheng Zhang Hua Wang +4 位作者 Si Chen Junjie Yu Yuantao Liao Zongsheng Lu Jun Wei 《地球科学学刊:英文版》 SCIE CAS CSCD 2019年第1期158-175,共18页
Studies on basin fills have provided significant insights into reservoir distribution and prediction in petroliferous basins, however, the effect of basin fills on source rock properties has been underexplored. This p... Studies on basin fills have provided significant insights into reservoir distribution and prediction in petroliferous basins, however, the effect of basin fills on source rock properties has been underexplored. This paper documents basin filling characteristics and their implications for depositional processes and heterogeneity of source rock in the Qingnan subsag of the Jiuquan Basin, by using subsurface geological data from recent hydrocarbon exploration efforts in this area. Drill core data reveals that the basin fill of the Qingnan subsag was dominated by fan delta-lacustrine systems, in which deposition of the fan deltas along the basin margin was mainly through gravity flows. The temporal and spatial evolution of the depositional systems indicates that the basin fill was characterized by a continuously retrogradational process, with decreasing extent of fan deltas in vertical succession. Weakening of tectonic activities and climate change from humid to semi-arid are interpreted to be the main control factors that were responsible for the retrogradational basin fill. The different depositional environments in the early stage and late stage of the retrogradational basin filling history resulted in the different depositional processes and properties of source rocks. This study suggests that source rock heterogeneity associated with basin fills in lacustrine basins should be considered in hydrocarbon exploration. 展开更多
关键词 BASIN FILLS source rock DEPOSITIONAL process RIFT BASIN Jiuquan BASIN
Discovery of Triassic volcanic-sedimentary strata in the basement of Songliao Basin
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作者 Yongkang Yin Youfeng Gao +2 位作者 Pujun Wang Xuejiao Qu Haibo Liu 《科学通报:英文版》 SCIE EI CSCD 2019年第10期644-646,共3页
In the Songliao Basin, the existence of lower Mesozoic strata remains a debatable issue. Previous studies indicated the absence of Triassic to Lower and Middle Jurassic strata in northeastern China because of uplift a... In the Songliao Basin, the existence of lower Mesozoic strata remains a debatable issue. Previous studies indicated the absence of Triassic to Lower and Middle Jurassic strata in northeastern China because of uplift and erosion events associated with the return of geo-synclinal folds and orogenic movement during the Late Permian-Early Jurassic. To date, geochronological studies of intrusive and metamorphic rocks in the basement of the Songliao Basin have also confirmed Carboniferous, Permian, and Late Jurassic ages for the basement formations in general [1-4]. In the International Continental Scientific Drilling Project (ICDP) in the Songliao Basin, radiometric dating has been carried out for the entire drilling core of the SK-2 east borehole. As a result, we have discovered Triassic volcanic-sedimentary strata in the basement of the Songliao Basin. 展开更多
关键词 Songliao BASIN MESOZOIC strata REMAINS the Songliao BASIN
Analysis of occurrence characteristics of geothermal resources and its relation to control structures in Zibo City, China 预览
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作者 TAN Xiao-bo WEI Shan-ming +1 位作者 BO Ben-yu JIANG Dian-qing 《地下水科学与工程:英文版》 2019年第1期70-76,共7页
According to the geothermal geological conditions, the geothermal resources in Zibo can be divided into sedimentary basin type and tectonic basin type. The main thermal reservoirs of sedimentary basin type are the Neo... According to the geothermal geological conditions, the geothermal resources in Zibo can be divided into sedimentary basin type and tectonic basin type. The main thermal reservoirs of sedimentary basin type are the Neogene Guantao Formation and the Paleogene Dongying Formation.The thermal reservoirs of tectonic basin type are mainly the Ordovician Majiagou Group. The characteristics of reservoir, cap, pass and source of thermal resource types in different areas are elaborated. Based on the analysis of the wellforming conditions of the existing geothermal wells in the area, combined with the geothermal anomaly areas and hydrogeochemistry, it was discovered that the fault structures in the area, especially the deep faults such as Yuwangshan fault, Wangmushan fault, Zhangdian fault and Chaomizhuang graben, play an important role in controlling the occurrence and distribution of tectonic basin-type geothermal resources in Zibo City. 展开更多
关键词 Zibo CITY SEDIMENTARY BASIN TYPES TECTONIC BASIN TYPES Structures
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Application of channel-belt scaling relationship to Middle Jurassic sourceto- sink system in the Saishiteng area of the northern Qaidam Basin, NW China
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作者 Bing-Qiang Liu Long-Yi Shao +2 位作者 Xue-Tian Wang Ya-Nan Li Jie Xu 《古地理学报:英文版》 CSCD 2019年第2期181-197,共17页
Palaeodrainage basin, as an important component of the source-to-sink system, contains critical information on provenance and palaeoenvironment. Previous studies indicate that the scaling relationships of source-to-si... Palaeodrainage basin, as an important component of the source-to-sink system, contains critical information on provenance and palaeoenvironment. Previous studies indicate that the scaling relationships of source-to-sink system components generally follow power laws, and channel-belt thickness represents a reliable first-order proxy for the drainage area. In this study, a database of borehole cores and geophysical well logs of the Jurassic coal measures from Saishiteng area in the northern Qaidam Basin was used to reconstruct the palaeogeography, and to identify single-story channel-belts. Three palaeochannels, namely, River A, River B and River C, were identified which were persistent throughout the Dameigou and Shimengou Formations during the Middle Jurassic. The mean channel-belt thicknesses of River A, River B and River C in the Dameigou Formation were 9.8 m, 8.9 m and 7.9 m, respectively, and those in the Shimengou Formation were 7.4 m, 6.2m and 5.4 m, respectively. We estimate the drainage area of three major rivers by using scaling relationships between drainage area and channel-belt thickness. The drainage areas of River A, River B and River C in the Dameigou Formation were 63.0 × 10^3 km^2, 50.1 × 10^3 km^2 and 37.7 × 10^3 km^2, respectively, and those in the Shimengou Formation were 32.3 × 10^3 km^2, 21.2 × 10^3 km^2 and 15.3 × 10^3 km^2, respectively. The drainage basin lengths of River A, River B and River C in the Dameigou Formation were 300.4 km, 239 km and 180.2 km, respectively, and those in the Shimengou Formation were 154.3 km, 10^1.3 km and 73.1 km, respectively. For both the Dameigou and Shimengou Formations, River A showed the largest scale, followed by River B and River C succeedingly, which was mainly determined by the stretch direction of provenance in the southern Qilian Mountains. The variations of channel-belt thickness, drainage area and drainage basin length between Dameigou and Shimengou Formations are the response of source-to-sink system to the transformation from extension to 展开更多
关键词 Northern Qaidam BASIN Middle Jurassic SOURCE-TO-SINK SYSTEM Drainage BASIN Channel-belt scaling relationship
New Discovery of Upper Crustal High-and Low-VelocityBelts and High-Velocity Core in the Tarim Basin 预览
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作者 WANG Tengfei JIN Zhenkui +5 位作者 YU Xiaoxia CHENG Rihui SONG Xue YANG Baojun LI Shuo SHI Shuting 《地质学报:英文版》 SCIE CAS CSCD 2019年第1期229-230,共2页
The Tarim Basin is the biggest oil-and gas-bearing basin in China,which has undergone long-term and complicated evolutionary history.During each evolutional stage and in different sub-basins in the same stage,the Tari... The Tarim Basin is the biggest oil-and gas-bearing basin in China,which has undergone long-term and complicated evolutionary history.During each evolutional stage and in different sub-basins in the same stage,the Tarim Basin has different proto-types,and it is thus named a composite and superimposed basin.A study on the basement nature of such a complex but significant to the national oil and gas strategy basin is of great significance(Huang Chenjun et al.,2017).Based on earthquake data,detailed velocity structure of deep basin can be obtained in order to research the basement nature. 展开更多
关键词 The TARIM BASIN the BIGGEST the TARIM BASIN
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Sedimentary and geochemical characteristics of the Triassic Chang 7 Member shale in the Southeastern Ordos Basin,Central China
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作者 Jing-Wei Cui Ru-Kai Zhu +1 位作者 Zhong Luo Sen Li 《石油科学:英文版》 SCIE CAS CSCD 2019年第2期285-297,共13页
The Ordos Basin is the largest petroliferous basin in China, where the Chang 7 Member shale serves as the major source rock in the basin, with an area of more than 100,000 km2 So far, sedimentary and geochemical chara... The Ordos Basin is the largest petroliferous basin in China, where the Chang 7 Member shale serves as the major source rock in the basin, with an area of more than 100,000 km2 So far, sedimentary and geochemical characterizations have rarely been conducted on the shale in shallow(< 1000 m) areas in the southeastern part of the basin, but such characterizations can help identify the genesis of organic-rich shale and promote the prediction and recovery of shale oil. In this paper,several outcrop sections of the Chang 7 Member in the Tongchuan area were observed and sampled, and sedimentary and geochemical characterizations were conducted for the well-outcropped YSC section. The study results show that the Chang7 Member shale is widely distributed laterally with variable thickness. The organic-rich shale is 7-25 m thick in total and exhibits obvious horizontal variation in mineral composition. In the eastern sections, the shale contains organic matter of TypeⅡ2-Ⅲ and is low in thermal maturity, with high clay mineral content, low K-feldspar content, and no pyrite. In the western sections, the shale contains Type Ⅱ1 organic matter and is low in thermal maturity, with high clay mineral, K-feldspar, and pyrite contents. The YSC section reveals three obvious intervals in vertical mineral composition and organic abundance.The Chang 7 Member organic-rich shale(TOC > 10%) contains mainly sapropelite and liptinite, with Type Ⅱ kerogen. It is generally characterized by a hydrocarbon potential of more than 70 mg/g, low maturity, and shallow-semideep lacustrine facies. In the western sections, the shale, still in a low maturity stage, has a higher hydrocarbon potential and is optional for shale oil recovery. However, the Chang 7 Member shale in the study area is highly heterogeneous and its shale oil recovery is practical only in the organic-rich intervals. 展开更多
关键词 ORDOS Basin CHANG 7 MEMBER oil Organic-rich SHALE SEDIMENTARY CHARACTERISTICS Geochemical CHARACTERISTICS
Hypervelocity Impacts and Exposed Lithospheric Mantle: A Way to Recognize Large Terrestrial Impact Basins?
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作者 Peter Olds 《地球科学学刊:英文版》 SCIE CAS CSCD 2019年第3期451-459,共9页
On the Moon and Mars olivine of probable mantle origin is detected at rims of large Late Heavy Bombardment (LHB) age impact basins for which excavation depth estimates exceed crustal thickness estimates. But lunar Cri... On the Moon and Mars olivine of probable mantle origin is detected at rims of large Late Heavy Bombardment (LHB) age impact basins for which excavation depth estimates exceed crustal thickness estimates. But lunar Crisium size impact basins are not recognized on Earth nor expected in the Phanerozoic from conventional interpretations of crater size frequency distributions. In this study several large circular to elliptical basin structures on Earth, for which hypothesized impact excavation depth would greatly exceed crustal thickness, are examined for the presence of exposed lithospheric mantle, expressed as ophiolite, at the rims. Three Phanerozoic impact basins, modified by plate tecto ics and tentatively correlated with "ophiolite obductionM plus global extinction events, are proposed here. These tentatively suggested Phanerozoic impact basins are:(1) Yucatan Basin/Puerto Rico Trench with a Greater Antilles ophiolite rim. Cretaceous-Paleogene Boundary global extinction may correlate with Maastrichtian ophiolite obduction in Southeast Cuba.(2) Loyalty Basin with a New Caledonia ophiolite plus (fEntrecasteaux Ridge rim. Late Eocene global extinction may correlate with obduction of the New Caledonia Peridotite Nappe.(3) Sulu Sea Basin with a Palawan, Sabah etc. ophiolite rim. The Middle Miocene Disruption Event may correlate with ophiolite obduction plus ophiolitic melange emplacement in Sabah and in Palawan. These originally circular to elliptical belts of exposed lithospheric mantle may serve as strain markers for relative plate motions in the vicinity of plate boundaries during post-impact geologic times. It is further speculated that plate boundaries may be initiated and/or modified by such impacts. 展开更多
关键词 OLIVINE mantle IMPACT basin OPHIOLITE OBDUCTION mass EXTINCTION
Formation and evolution of the tertiary carbonate reefs in the Madura Strait Basin of Indonesia 预览
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作者 RAN Weimin LUAN Xiwu +5 位作者 LU Yintao LIU Hong YANG Jiajia ZHAO Yang HE Wenchang YAN Zhonghui 《海洋湖沼学报(英文)》 SCIE CAS CSCD 2019年第1期47-61,共15页
Analysis of 2D seismic data over 4 500 km in length from the Madura Strait Basin in the East Java Sea reveals seismic refl ection characteristics of reefs and associated sedimentary bodies,including asymmetrical or sy... Analysis of 2D seismic data over 4 500 km in length from the Madura Strait Basin in the East Java Sea reveals seismic refl ection characteristics of reefs and associated sedimentary bodies,including asymmetrical or symmetrical dome reflections,slope progradational reflections,chaotic reflections and discontinuous strong reflections inside the reef,which onlap the fl ank of the reef.It is concluded that the developmental paleo-environment of most reefs is mainly conducive to shallow marine carbonate platform facies and platform margin facies,based on well core data,variations in seismic facies and strata thickness.The formation and evolution of all reefs are primarily infl uenced by the tectonic framework of the Madura Strait Basin.Platform margin reefs are principally controlled by two types of structures:one is a series of E-W trending Paleogene normal faults,and the other is an E-W trending Neogene inversion structures.In addition,wave actions,tidal currents and other ocean currents play an accelerated role in sorting,rounding and redeposition for the accumulation and evolution of reefs.Tertiary reefs in the MSB can be divided into four types:1)an open platform coral reef of Late Oligocene to Early Miocene,2)a platform margin coral reef controlled by normal faults in Late Oligocene to Early Miocene,3)a platform margin Globigerina moundreef controlled by a“hidden”inversion structure in Early Pliocene,and 4)a platform margin Globigerina mound-reef controlled by thrust faults in the early Pliocene.Patterns of the formation and evolution of reefs are also suggested. 展开更多
关键词 reef seismic reflection characteristics FORMATION and EVOLUTION TERTIARY Madura STRAIT Basin Indonesia
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Paleogeomorphic Influence on Facies Characteristics and Reservoir Prediction in Lacustrine Basin—By Taking Cretaceous Reservoirs in the Western Slope of SL Basin,China as an Example 预览
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作者 Longtao Cui Qianping Zhang +2 位作者 Xue Liu Ming Yang Jianmin Zhu 《长江油气(英文版)》 2019年第2期113-124,共12页
The West Slope of SL Basin,China,mainly targets on lithologic reservoirs for oil and gas.The paleogeomorphology and provenance direction analysis has great significance for predicting the type and distribution of sand... The West Slope of SL Basin,China,mainly targets on lithologic reservoirs for oil and gas.The paleogeomorphology and provenance direction analysis has great significance for predicting the type and distribution of sand body.According to the analysis of well logging,core and seismic data,braided delta and gravity sediment mainly develop in the study area.A backs tripping method is used to reconstruct the topography of Qingshankou to Yaojia Formation,Cretaceous.The West Slope is mainly controlled by two slope belts in Qingshankou Formation,with the width of upper slope 12-18 km and the gradient 0.7-0.8 degrees,the width of lower slope 13-15 km and the gradient 1.0 degrees.The West Slope is controlled by a single slope belt in Yaojia Formation,with the lower slope width of 13-16 km and the gradient 0.4 degrees.The relationship between the slope belt,provenance direction and sand body distribution is analyzed,and result shows that the combination of upper and lower slope controls the distribution of reservoir types,and the provenance supply rate controls the scale of sand body.The gravity flow develops when the provenance direction is parallel to slope direction,and the slope becomes transporting channel in vertical to provenance direction.The paleogeomorphology,lake level and provenance direction are the main control factors of sand body in West Slope. 展开更多
关键词 SL BASIN Paleogeomorphology SLOPE Belt Sedimentary Type
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Hydrological Simulation Using TRMM and CHIRPS Precipitation Estimates in the Lower Lancang-Mekong River Basin 预览
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作者 LUO Xian WU Wenqi +2 位作者 HE Daming LI Yungang JI Xuan 《中国地理科学:英文版》 SCIE CSCD 2019年第1期13-25,共13页
Satellite-based products with high spatial and temporal resolution provide useful precipitation information for data-sparse or ungauged large-scale watersheds. In the Lower Lancang-Mekong River Basin, rainfall station... Satellite-based products with high spatial and temporal resolution provide useful precipitation information for data-sparse or ungauged large-scale watersheds. In the Lower Lancang-Mekong River Basin, rainfall stations are sparse and unevenly distributed, and the transboundary characteristic makes the collection of precipitation data more difficult, which has restricted hydrological processes simulation. In this study, daily precipitation data from four datasets(gauge observations, inverse distance weighted(IDW) data, Tropical Rainfall Measuring Mission(TRMM) estimates, and Climate Hazards Group InfraRed Precipitation with Stations(CHIRPS) estimates), were applied to drive the Soil and Water Assessment Tool(SWAT) model, and then their capability for hydrological simulation in the Lower Lancang-Mekong River Basin were examined. TRMM and CHIRPS data showed good performances on precipitation estimation in the Lower Lancang-Mekong River Basin, with the better performance for TRMM product. The Nash-Sutcliffe efficiency(NSE) values of gauge, IDW, TRMM, and CHIRPS simulations during the calibration period were 0.87, 0.86, 0.95, and 0.93 for monthly flow, respectively, and those for daily flow were 0.75, 0.77, 0.86, and 0.84, respectively. TRMM and CHIRPS data were superior to rain gauge and IDW data for driving the hydrological model, and TRMM data produced the best simulation performance. Satellite-based precipitation estimates could be suitable data sources when simulating hydrological processes for large data-poor or ungauged watersheds, especially in international river basins for which precipitation observations are difficult to collect. CHIRPS data provide long precipitation time series from 1981 to near present and thus could be used as an alternative precipitation input for hydrological simulation, especially for the period without TRMM data. For satellite-based precipitation products, the differences in the occurrence frequencies and amounts of precipitation with different intensities would affect simulation re 展开更多
关键词 hydrological simulation satellite-based PRECIPITATION ESTIMATES spatial distribution of PRECIPITATION international RIVER the LOWER Lancang-Mekong RIVER Basin
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Remotely sensed estimation and mapping of soil moisture by eliminating the effect of vegetation cover 预览
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作者 WU Cheng-yong CAO Guang-chao +6 位作者 CHEN Ke-long E Chong-yi MAO Ya-hui ZHAO Shuang-kai WANG Qi SU Xiao-yi WEI Ya-lan 《农业科学学报:英文版》 SCIE CAS CSCD 2019年第2期316-327,共12页
Soil moisture(SM), which plays a crucial role in studies of the climate, ecology, agriculture and the environment, can be estimated and mapped by remote sensing technology over a wide region. However, remotely sensed ... Soil moisture(SM), which plays a crucial role in studies of the climate, ecology, agriculture and the environment, can be estimated and mapped by remote sensing technology over a wide region. However, remotely sensed SM is constrained by its estimation accuracy, which mainly stems from the influence of vegetation cover on soil spectra information in mixed pixels. To overcome the low-accuracy defects of existing surface albedo method for estimating SM, in this paper, Qinghai Lake Basin, an important animal husbandry production area in Qinghai Province, China, was chosen as an empirical research area. Using the surface albedo computed from moderate resolution imaging spectroradiometer(MODIS) reflectance products and the actual measured SM data, an albedo/vegetation coverage trapezoid feature space was constructed. Bare soil albedo was extracted from the surface albedo mainly containing information of soil, vegetation, and both albedo models for estimating SM were constructed separately. The accuracy of the bare soil albedo model(root mean square error=4.20, mean absolute percent error=22.75%, and theil inequality coefficient=0.67) was higher than that of the existing surface albedo model(root mean square error=4.66, mean absolute percent error=25.46% and theil inequality coefficient=0.74). This result indicated that the bare soil albedo greatly improved the accuracy of SM estimation and mapping. As this method eliminated the effect of vegetation cover and restored the inherent soil spectra, it not only quantitatively estimates and maps SM at regional scales with high accuracy, but also provides a new way of improving the accuracy of soil organic matter estimation and mapping. 展开更多
关键词 SOIL moisture remote sensing BARE SOIL ALBEDO TRAPEZOID feature space QINGHAI Lake Basin
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Evaluating Suitability of Multiple Precipitation Products for the Lancang River Basin 预览
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作者 TANG Xiongpeng ZHANG Jianyun +7 位作者 WANG Guoqing YANG Qinli YANG Yanqing GUAN Tiesheng LIU Cuishan JIN Junliang LIU Yanli BAO Zhenxin 《中国地理科学:英文版》 SCIE CSCD 2019年第1期37-57,共21页
Global reanalysis precipitation products could provide valuable meteorological information for flow forecasting in poorly gauged areas, helping to overcome a long-standing challenge in the field. But not all data sour... Global reanalysis precipitation products could provide valuable meteorological information for flow forecasting in poorly gauged areas, helping to overcome a long-standing challenge in the field. But not all data sources are suitable for all regions or perform the same way in hydrological modeling, so it is essential to test the suitability of precipitation products before applying them. In this study, five widely used global high-resolution precipitation products-Asian Precipitation Highly Resolved Observational Data Integration Towards Evaluation of Water Resources(APHRODITE), National Centers for Environmental Prediction Climate Forecast System Reanalysis(NCEP-CFSR), Climate Hazards Group InfraRed Precipitation with Station Data(CHIRPS), China Gauge-based Daily Precipitation Analysis developed by China Meteorological Administration(CMA) and Agricultural Model Intercomparison and Improvement Project based on the NASA Modern-Era Retrospective Analysis for Research and Applications(AgMERRA)-were evaluated using statistical methods and a hydrological approach for their suitability for the Lancang River Basin. The results indicated that APHRODITE, CMA, AgMERRA and CHIRPS were more accurate precipitation indicators than NCEP-CFSR in terms of the multiyear average and seasonal spatial distribution pattern, all of the CHIRPS, Ag MERRA and APHRODITE perform better than CMA and NCEP-CFSR at the small, medium and high precipitation intensities ranges in subbasin11 and sunbabsin46. All five products performed better in subbasin46(a low-altitude region) than in subbasin11(a high-altitude region) on the daily and monthly scales. In addition to NCEP-CFSR, the other four products all presented encouraging potential for streamflow simulation at daily(Yunjinghong) and monthly(Yunjinghong, Jiuzhou and Gajiu) scale. Hydrological simulations forced with APHRODITE were the best of the five for the Yunjinghong station in capturing daily and monthly measured streamflow. Except for NCEP-CFSR, all products were very good for hydrologic 展开更多
关键词 MULTIPLE PRECIPITATION PRODUCTS SUITABILITY evaluation the Lancang River BASIN
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Orbital cyclicity in sedimentary sequence and climatic indications of C-O isotopes from Lower Cretaceous in Qingxi Sag,Jiuquan Basin,NW China 预览
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作者 Siding Jin Haiyang Cao +2 位作者 Hua Wang Michael Wagreich Sylvain Richoz 《地学前缘:英文版》 CAS CSCD 2019年第2期467-479,共13页
Sedimentary deposits of the Lower Cretaceous Xiagou Formation form the most significant potential hydrocarbon reservoirs in the Qingxi Sag,Jiuquan Basin(NW China).Zircon U-Pb ages of the dated basalts at the top of th... Sedimentary deposits of the Lower Cretaceous Xiagou Formation form the most significant potential hydrocarbon reservoirs in the Qingxi Sag,Jiuquan Basin(NW China).Zircon U-Pb ages of the dated basalts at the top of the Xiagou Formation give an isochron age of 115.6 Ma,and the sedimentation interval of the Xiagou Formation was speculated to range from about 125/124 Ma to 115 Ma based on paleontological research and stratigraphic correlation analysis.Here we use GR logging data as a palaeoenvironmental and palaeoclimatic proxy to conduct a detailed cyclostratigraphic study of five selected wells.Power spectra,evolutionary fast Fourier transformation and wavelet analysis all reveal significant sedimentary cycles in the Xiagou Formation.The ratios of cycle wavelengths in these stratigraphic units are 33.82 m:7.91 m:3.06 m:1.79 m,which is similar to the ratio of orbital targets of 20:5:2:1.The ratio of 20:5:2:1 is interpreted as Milankovitch cycles of 405 kyr long eccentricity,100 kyr short eccentricity,37 kyr obliquity,and 22 kyr precession cycles respectively.A high-resolution astronomical time scale is constructed by tuning the stratigraphy into target curves of orbital cycles respectively.Based on the astronomical time scale,the absolute ages of 55 samples were estimated,which are used for subsequent stable carbon and oxygen isotope stratigraphy analysis.The analysis results of the five studied wells in the Qingxi Sag indicate:(1)a negative trend ofδ13C values upwards in the Xiagou Formation,and(2)negativeδ18O values with a positive trend upwards.Both relatively heavy values and pronounced covariances ofδ13C values andδ18O values indicate an arid-evaporationcontrolled climate during the sedimentary period of the Lower Cretaceous Xiagou Formation,Qingxi Sag,Jiuquan Basin.Moreover,positive covariances of SQK1g2t3 indicate extremely high temperature,and negative covariances of SQK1g1 indicate a relatively low temperature. 展开更多
关键词 Jiuquan Basin Qingxi SAG Xiagou Formation ORBITAL CYCLICITY Stable ISOTOPE
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提高盆地重叠分布矿产综合利用水平的思考 预览
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作者 姜杉钰 王峰 《国土资源情报》 2019年第2期26-30,共5页
盆地是矿产资源最为富集的地质单元,如何对盆地内的矿产资源进行综合勘查开采,合理避免矿业权叠置产生的矛盾冲突是当前亟待解决的问题。本文首先分析了盆地矿产资源的特点和勘查开采中存在的典型问题,在此基础上结合国内外经验和案例,... 盆地是矿产资源最为富集的地质单元,如何对盆地内的矿产资源进行综合勘查开采,合理避免矿业权叠置产生的矛盾冲突是当前亟待解决的问题。本文首先分析了盆地矿产资源的特点和勘查开采中存在的典型问题,在此基础上结合国内外经验和案例,为我国盆地矿产资源综合勘查开发提出对策建议。研究认为,我国盆地矿产资源综合勘查开采程度不高,各类矿产矿业权叠置问题突出,严重影响了盆地资源的综合利用。针对相关问题,建议有关部门首先做好盆地矿产资源综合规划,建立资料共享平台;其次应促进各方协同勘查开采,完善矿业权管理制度;再是补充和完善相关法律法规与技术标准规范,为矿山企业提供工作参考,也为政府监管提供抓手。 展开更多
关键词 盆地 重叠分布矿产 综合利用 矿业权
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Analysis of the Oldest Carbonate Gas Reservoir in China——New Geological Significance of the Dengying Gas Reservoir in the Weiyuan Structure, Sichuan Basin
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作者 Xiao Liang Shugen Liu +3 位作者 Shubei Wang Bin Deng Siyu Zhou Wenxin Ma 《地球科学学刊:英文版》 SCIE CAS CSCD 2019年第2期348-366,共19页
The Weiyuan Structure is the largest surface structure in the Sichuan Basin. However, the abundance of the Dengying Formation gas reservoir in the Weiyuan Structure is low. The height of the gas column is 244 m, but t... The Weiyuan Structure is the largest surface structure in the Sichuan Basin. However, the abundance of the Dengying Formation gas reservoir in the Weiyuan Structure is low. The height of the gas column is 244 m, but the integrated abundance is only 26.4%. After nearly 40 years of exploration, the Gaoshi1 Well and Moxi8 Well yielded gas flows that marked an important exploration success after the discovery of the Sinian Dengying Formation gas reservoir in the Weiyuan Structure, Sichuan Basin, Lower-Paleozoic in 1964. Combined with research examples of oil and gas migration and gas chimneys around the world, the authors used comprehensive geological-geophysical-geochemical research methods to provide a reasonable explanation of the low abundance of the gas reservoir in the Weiyuan Structure based on the surface and subsurface data. The latest research results show that(1) currently, the Weiyuan Structure is the apex of the Dengying Formation in the Mid-Sichuan Basin. The Guang’an, Longnüsi, Gaoshiti-Moxi, and Weiyuan structures are a series of traps in the Dengying Formation with gradual uplifting spill and closure points during the regional uplift of the Himalayan period. The natural gas of the Dengying Formation accumulated in different ways over a wide range and long distance in the Sichuan Basin.(2) At approximately 40 Ma, the Weiyuan area started to uplift and form the present structure, and it is the only outcropped area with the Triassic Jialingjiang Formation and Leikoupo Formation in the surface of the Sichuan Basin(except the steep structural belt in East Sichuan). Caused by the uplift and denudation, the core of the Weiyuan Structure has formed an escaping 'skylight' for natural gas. The evidence of a gas chimney includes(1) the component percentage of non-hydrocarbon gas, which decreased from the bottom to the top,(2) the pressure coefficient is normal because the gas reservoir from the Upper Sinian to the Lower Permian commonly have a normal pressure coefficient(an average of 1.0), and(3) the isotop 展开更多
关键词 SICHUAN Basin Weiyuan STRUCTURE Dengying Formation LATE reconstruction differential ACCUMULATION gas CHIMNEY
Recent snow cover variation in the Upper Indus Basin of Gilgit Baltistan, Hindukush Karakoram Himalaya
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作者 Hazrat BILAL CHAMHURI Siwar +1 位作者 MAZLIN Bin Mokhtar KASTURI Devi Kanniah 《山地科学学报:英文版》 SCIE CSCD 2019年第2期296-308,共13页
Mountainous basins like the Upper Indus Basin(UIB) of Gilgit Baltistan(GB) are dependent on seasonal snowmelt and glacier melt. Monitoring of the snow-covered area(SCA) is not only vital for the overall hydrology of t... Mountainous basins like the Upper Indus Basin(UIB) of Gilgit Baltistan(GB) are dependent on seasonal snowmelt and glacier melt. Monitoring of the snow-covered area(SCA) is not only vital for the overall hydrology of the Indus basin but also important to the sustainable agriculture and hydropower system. The snow-covered area in the UIB of GB was investigated for changes over the last 18 years using the Moderate Resolution Imaging Spectroradiometer(MODIS) snow product. The study area was divided into five elevation zones ranging from 877-8564 meters above sea level(m ASL). In contrast to the global cryosphere related studies, SCA in the UIB is slightly increasing. Elevation based SCA analysis also indicated that SCA is slightly increasing in each elevation zone. However, a significant amount of snow is concentrated in areas above 5000 m ASL. Due to the strong correlation between SCA and precipitation, the precipitation data also follow a similar trend. Analysis of the climatic data suggests a statistically significant increase in total monthly precipitation and relative humidity, a slight decrease in mean monthly temperature and a significant upward tendency in monthly solar irradiance data. All these trends in combination with the increasing trend in global precipitation, winter westerly disturbances and orographic precipitation are the important factors behind the slightly increasing SCA in the study area. Our results though constrained by short observation period mainly contribute to the understanding of advancing snow cover and glaciers in Hindukush Karakoram. 展开更多
关键词 Snow MODIS WESTERLY disturbances Climate change UPPER Indus BASIN Glaciers
Relations of Uranium Enrichment and Carbonaceous Debris within the Daying Uranium Deposit, Northern Ordos Basin
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作者 Fan Zhang Yangquan Jiao +2 位作者 Liqun Wu Hui Rong Longhui Wang 《地球科学学刊:英文版》 SCIE CAS CSCD 2019年第1期142-157,共16页
Carbonaceous debris(CD)is widely distributed in the sandstone of the Daying Uranium Deposit,northern Ordos Basin,and coexists with uranium minerals,which provides a favorable case for studying their relationship.Vitri... Carbonaceous debris(CD)is widely distributed in the sandstone of the Daying Uranium Deposit,northern Ordos Basin,and coexists with uranium minerals,which provides a favorable case for studying their relationship.Vitrinite reflectance(VR),macerals,moisture,volatile matter,ash,total sulfur(St)and uranium concentration of CD within the sandstone were studied.The results show that VR ranges from 0.372%Ro to 0.510%Ro with an average value of 0.438%Ro,indicating that CD is in the stage of lignite.The contents of vitrinite(V),inertinite(I)and minerals range from 83.18%–99.48%,0–7.70%,and 0.34%–15.72%,respectively,with the corresponding average value of 95.51%,1.34%,and 3.15%,respectively which indicates that V is the major maceral.Moisture on air dried basis(Mad),volatile matter yield on dry,ash-free basis(Vdaf),ash yield on dried basis(Ad)and St mostly range from 7.95%–16.09%,44.70%–66.54%,4.84%–26.24% and 0.24%–1.12%,respectively,while their average values are 12.43%,53.41%,16.57% and 0.77%,respectively.It suggests that CD is of medium-high moisture,super-high volatile matter,low-medium ash and low sulfur.Uranium concentration ranges from 29 ppm to 92 ppm with an average value of 50 ppm,and uranium concentration increases with the decreased distance to CD.On the whole,Mad and Vdaf decrease with increasing burial depth,which indicates that CD experienced the burial metamorphism.However,Mad and Vdaf obviously decrease in uranium-rich areas whereas Ad and St noticeably increase.Comprehensive studies suggest that there is a certain relationship between uranium enrichment and CD.CD in the stage of lignite helps the adsorption of uranium.On one hand,radioactivity uranium enrichment makes organic matter maturation increase with a decrease in moisture and volatile matter.On the other hand,an increase in organic matter maturation,caused by radioactivity uranium enrichment,results in an increase in uranium minerals,which is instructive in the study of regional uranium mineralization and metallogenic regularity. 展开更多
关键词 CARBONACEOUS DEBRIS coal property parameters Daying URANIUM DEPOSIT ORDOS Basin
Application of Stable Strontium Isotope Geochemistry and Fluid Inclusion Microthermometry to Studies of Dolomitization of the Deeply Buried Cambrian Carbonate Successions in West-Central Tarim Basin, NW China
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作者 Ngong Roger Ngia Mingvi Hu +2 位作者 Da Gao Zhonggui Hu Chun-Yan Sun 《地球科学学刊:英文版》 SCIE CAS CSCD 2019年第1期176-193,共18页
Detailed petrographic,geochemical(O-C-Sr isotopes)and fluid inclusion studies of the deeply buried Cambrian carbonates in the West-central Tarim Basin revealed three types of crystalline dolomites(fine-crystalline,non... Detailed petrographic,geochemical(O-C-Sr isotopes)and fluid inclusion studies of the deeply buried Cambrian carbonates in the West-central Tarim Basin revealed three types of crystalline dolomites(fine-crystalline,nonplanar-a(s),dolomite(RD1),fine-to medium-crystalline,planar-e(s)dolomite(RD2),and medium-to coarse-crystalline,nonplanar-a dolomite(RD3)),medium-to coarsecrystalline,nonplanar-a saddle dolomite cement(CD)and early and later-stage calcite cement.The occurrence of RD1 along low-amplitude stylolites points to link with pressure dissolution by which minor Mg ions were likely released for replacive dolomitization during early-to intermediate-burial seawater dolomitization.The increasing crystal sizes of RD2 and RD3 with irregular overgrowth rims suggests intense recrystallization and replacement upon the RD1 or remaining precursor limestones by dolomitizing fluids during late intermediate burial dolomitization.The overlap ofδ18O,δ13C and 87Sr/86Sr values of RD1-RD3 and CD dolomite with coeval seawater values,suggests that the principal dolomitizing fluids that precipitated these dolomites was connate(Cambrian)seawater preserved in the host limestones/dolomites.Their high 87Sr/86Sr ratios suggest influx of radiogenic strontium into the Cambrian seawater.Two regimes of fluid flow are recognized in the study area:firstly,influx of magnesium-rich higher-temperature basinal brines along deep-seated faults/fractures,resulting in cementation by CD dolomite.Secondly,the incursion of meteoric waters,mixing with ascending highertemperature basinal brines,and an increase in Ca2+/Mg2+ratio in the fluids probably results in the precipitation of calcite cement in vugs and fractures. 展开更多
关键词 CAMBRIAN DOLOMITES C-O-Sr isotopes BURIAL DOLOMITIZATION West-central Tarim Basin fluid flow regimes
Sedimentary Facies, Sequence Stratigraphic Patterns in Pre-Cenozoic Inland Compressional Basin: Example from Early Yanshanian Succession of Eastern Yihezhuang Salient, Jiyang Depression, Bohai Bay Basin, China
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作者 Guangzeng Song Hua Wang +2 位作者 Meng Xu Jinda Xu Guoqing Sang 《地球科学学刊:英文版》 SCIE CAS CSCD 2019年第1期194-205,共12页
To improve the success rate of locating hydrocarbon reservoirs in pre-Cenozoic inland compressional basins, taking the Early Yanshanian succession of eastern Yihezhuang salient as an example, this paper studied the se... To improve the success rate of locating hydrocarbon reservoirs in pre-Cenozoic inland compressional basins, taking the Early Yanshanian succession of eastern Yihezhuang salient as an example, this paper studied the sedimentary facies and sequence stratigraphic patterns. First, through seismic profiles, well logs, cores and outcrops, the sequence framework was established and internal sedimentary facies were identified. Further, according to analysis of single-wells and connecting-wells, the vertical evolution and horizontal distribution of sedimentation inside the sequence frameworks were discussed. The following results were acquired:(1) meandering river characterized by dual structures superposing each other was developed, and the dual structures can be further divided into three kinds;(2) the entire Early Yanshanian succession was interpreted as one first-order sequence, composed of three third-order sequences, including SQ-Fz1, SQ-Fz2 and SQ-St from bottom to top. Each third-order sequence can be further divided into three system tracts;(3) in different system tracts, different types of dual structures developed separately, and sedimentary bodies showed different horizontal distribution scales and vertical superposition patterns. Finally, the model of sequence stratigraphic patterns was established. This study enhanced the use of sequence stratigraphy to inland tectonically active basins, and would be helpful to predict reservoirs in pre-Cenozoic residual basins. 展开更多
关键词 Early YANSHANIAN SUCCESSION SEQUENCE STRATIGRAPHIC PATTERNS INLAND compressional basin meandering river dual structure
Spatial-temporal coupling between high-quality source rocks and reservoirs for tight sandstone oil and gas accumulations in the Songliao Basin,China 预览
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作者 Laixing Cai Guolin Xiao +2 位作者 Shuangfang Lu Jiao Wang Zhiqiang Wu 《矿业科学技术学报:英文版》 CSCD 2019年第3期387-397,共11页
The spatial-temporal relationship between high-quality source rocks and reservoirs is a key factor when evaluating the formation,occurrence,and prospectivity of tight oil and gas reservoirs.In this study,we analyze th... The spatial-temporal relationship between high-quality source rocks and reservoirs is a key factor when evaluating the formation,occurrence,and prospectivity of tight oil and gas reservoirs.In this study,we analyze the fundamental oil and gas accumulation processes occurring in the Songliao Basin,contrasting tight oil sand reservoirs in the south with tight gas sand reservoirs in the north.This is done using geochemical data,constant-rate and conventional mercury injection experiments,and fluid inclusion analyses.Our results demonstrate that as far as fluid mobility is concerned,the expulsion center coincides with the overpressure zone,and its boundary limits the occurrence of tight oil and gas accumulations.In addition,the lower permeability limit of high-quality reservoirs,controlled by pore-throat structures,is 0.1×10^-3μm^2 in the fourth member of the Lower Cretaceous Quantou Formation(K1q^4)in the southern Songliao Basin,and 0.05×10^-3μm^2 in the Lower Cretaceous Shahezi Formation(K1sh)in the northern Songliao Basin.Furthermore,the results indicate that the formation of tight oil and gas reservoirs requires the densification of reservoirs prior to the main phase of hydrocarbon expulsion from the source rocks.Reservoir“sweet spots”develop at the intersection of high-quality source rocks(with high pore pressure)and reservoirs(with high permeability). 展开更多
关键词 Spatial-temporal COUPLING HIGH-QUALITY source rock HIGH-QUALITY SANDSTONE TIGHT SANDSTONE reservoir Songliao Basin
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