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Affecting factors and application of the stable hydrogen isotopes of alkane gases 预览
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作者 HUANG Shipeng DUAN Shufu +8 位作者 WANG Zecheng JIANG Qingchun JIANG Hua SU Wang Feng Qingfu HUANG Tongfei YUAN Miao REN Mengyi CHEN Xiaoyue 《石油勘探与开发:英文版》 2019年第3期518-530,共13页
To study the composition, affecting factors of the stable hydrogen isotopes of alkane gases and their application to identification of the natural gas origin and maturities, the chemical and isotopic compositions of 1... To study the composition, affecting factors of the stable hydrogen isotopes of alkane gases and their application to identification of the natural gas origin and maturities, the chemical and isotopic compositions of 118 gas samples of Carboniferous- Permian in the Ordos Basin, and of Triassic in the Sichuan Basin, combined with 68 gas samples from the Sinian and Cambrian reservoirs in the Sichuan Basin, and Ordovician and Siliurian reservoirs of Tarim Basin, are analyzed comprehensively. The following conclusions are obtained:(1) Natural gases in the study area and strata of the Ordos and Sichuan basins are dominated by alkane gases, and the dryness coefficients and maturities of the Carboniferous-Permian gases in the Ordos Basin are higher than the gases in the Triassic Xujiahe Formation of the Sichuan Basin, while the hydrogen isotopes of the latter ones are much enriched in 2H than the former.(2) The δ2HCH4-C1/C2+3 genetic identification diagram of natural gas was drawn, and the diagrams of hydrogen isotopic differences between the heavy alkane gases and methane vs. hydrogen isotopes of alkane gases can also be used in natural gas genetic identification.(3) The δ2HCH4-Ro formulas of coal-formed gas in different areas of the two basins are given, and the δ2HC2H6-δ2HCH4 is a new index for maturity, and the (δ2HC2H6-δ2HCH4)-Ro formula of the coal-formed gas can be used to calculate the maturity of the natural gas.(4) The stable hydrogen isotopes of alkane gases are affected by parent materials in source rocks, maturity, mixing and the aqueous medium conditions, among which the aqueous paleo-salinity is the key factor. To sum up, the hydrogen isotopes of alkane gases are affected by multiple factors, and they are significant to the identification of the origin, and maturity of natural gas, and the water environment during the deposition of source rocks. 展开更多
关键词 ALKANE GASES MATURITY hydrogen isotope gas origin aqueous salinity ORDOS BASIN Sichuan BASIN TARIM BASIN
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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
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
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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Structural architecture of Neoproterozoic rifting depression groups in the Tarim Basin and their formation dynamics
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作者 Bizhu HE Cunli JIAO +10 位作者 Taizhu HUANG Xingui ZHOU Zhihui CAI Zicheng CAO Zhongzheng JIANG Junwen CUI Zhuoyin YU Weiwei CHEN Ruohan LIU Xiaorui YUN Guangming HAO 《中国科学:地球科学英文版》 SCIE EI CAS CSCD 2019年第3期529-549,共21页
The Tarim Basin is the largest, oil-bearing, superimposed basin in the northwest of China. The evolution and tectonic properties of the initial Tarim Basin have been hotly disputed and remain enigmatic. The Neoprotero... The Tarim Basin is the largest, oil-bearing, superimposed basin in the northwest of China. The evolution and tectonic properties of the initial Tarim Basin have been hotly disputed and remain enigmatic. The Neoproterozoic basin is covered by a vast desert and a huge-thickness of sedimentary strata, has experienced multiple tectonic movements, had a low signal to noise ratios(SNRs) of deep seismic reflection data, all of which have posed critical obstacles to research. We analysed four field outcrops, 18 wells distributed throughout the basin, 27 reprocessed seismic reflection profiles with higher SNRs across the basin and many ancillary local 2D and 3D profiles and aeromagnetic data. We found about 20 normal fault-controlled rifting depressions of the Cryogenian and Ediacaran scattered throughout the basin, which developed on the Precambrian metamorphic and crystalline basement. The structural framework is clearly different from that of the overlying Phanerozoic. The rifting depressions consist of mainly half grabens, symmetrical troughs and horst-grabens. From the northeast to southwest of the basin,they are divided into three rifting depression groups with the WNW, ENE, and NW-trends that are mainly controlled by normal faults. The maximum thicknesses of the strata are up to 4100 m. From the Cryogenian to Ediacaran, most of the main inherited faults to active and eventually ceased at the end of the Ediacaran or Early Cambrian, while subsidence centres appeared and migrated eastward along the faults. They revealed that the different parts of the Tarim continental block were in NNE-SSWoriented and NNW-SSE-oriented extensional paleo-stress fields(relative to the present) during the Neoproterozoic, and were accompanied by clockwise shearing. According to the analysis of the activities of syn-sedimentary faults, filling sediments,magmatic events, and coordination with aeromagnetic anomalies, the tectonic properties of the fault depressions are different and are primarily continental rifts or intra-continental fault- 展开更多
关键词 RIFTING DEPRESSION groups Normal faults EXTENSIONAL and clockwise shearing CRYOGENIAN and EDIACARAN Continental rift and intra-continental fault-controlled BASIN Tarim BASIN
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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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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Sedimentary model reconstruction and exploration significance of Permian He 8 Member in Ordos Basin,NW China 预览
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作者 XIAO Hongping LIU Rui’e +2 位作者 ZHANG Fudong LIN Changsong ZHANG Mengyuan 《石油勘探与开发:英文版》 2019年第2期280-292,共13页
Based on the Late Paleozoic geological background and the latest exploration achievements of the Ordos Basin and North China platform, it is concluded that during the sedimentary period of Permian He 8 Member, the are... Based on the Late Paleozoic geological background and the latest exploration achievements of the Ordos Basin and North China platform, it is concluded that during the sedimentary period of Permian He 8 Member, the area in concern had multiple material sources, multiple river systems, flat terrain, shallow sedimentary water, widely distributed fluvial facies sand body and no continuous lake area, so alluvial river sedimentary system developed in the whole region. Based on stratigraphic correlation and division, and a large number of drilling and outcrop data, a comprehensive analysis of lithofacies and sedimentary facies types and distribution was carried out to reconstruct the ancient geographic pattern of the He 8 Member sedimentary period. The results of paleogeography restoration show that the area of Ordos Basin was the "runoff area" in the sedimentary slope in the western part of the North China platform during the sedimentary period of He 8 Member, the whole region was mainly alluvial plain sedimentation featuring alternate fluvial facies, flood plain facies and flood-plain lake facies. According to the results of flume deposition simulation experiment, a new sedimentary model of "alluvial river & flood-plain lake" is established, which reveals the genesis of large area gravel sand body in He 8 Member of this area and provides geological basis for the exploration of tight gas in the south of the basin. 展开更多
关键词 ORDOS Basin He 8 MEMBER North China platform paleogeographic restoration ALLUVIAL river flood-plain lake SEDIMENTARY model exploration significance
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Sedimentary geochemical proxies for methane seepage at Site C14 in the Qiongdongnan Basin in the northern South China Sea 预览
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作者 Tiantian Sun Daidai Wu +3 位作者 Fei Yang Lihua Liu Xuegang Chen Ying Ye 《海洋学报:英文版》 SCIE CAS CSCD 2019年第7期84-95,共12页
Recent studies have shown that specific geochemical characteristics of sediments can be used to reconstruct past methane seepage events.In this work,the correlation between the Sr/Ca and Mg/Ca ratios of sediment sampl... Recent studies have shown that specific geochemical characteristics of sediments can be used to reconstruct past methane seepage events.In this work,the correlation between the Sr/Ca and Mg/Ca ratios of sediment samples is analyzed and the sulfate concentration profile in Site C14 from cold-seep sediments in the Qiongdongnan Basin in northern South China Sea is obtained.The results confirmed that,sulfate at 0–247 cm below sea floor(Unit I)is mainly consumed by organic matter sulfate reduction(OSR),while sulfate at 247–655 cm(UnitⅡ)is consumed by both the OSR and the anaerobic oxidation of methane(AOM).In addition,the bottom sediment layer is affected by weak methane seepage.The Mo and U enrichment factors also exhibit similar trends in their respective depth profiles.The responses of trace elements,including Co/Al,Ni/Al,Cr/Al and Zn/Al ratios to methane seepage allowed the study of depositional conditions and methane seepage events.Based on the results,it is speculated that the depositional conditions of UnitⅡchanged with depth from moderate conditions of sulfidic and oxic conditions to locally anoxic conditions,and finally to suboxic conditions due to methane fluid leakage.The stable isotope values of chromium-reducible sulfide produced by AOM and those of sulfide formed by OSR in the early diagenetic environment suffered serious depletion of 34S.This was probably due to weak methane leakage,which caused the slower upward diffusion and the effect of early diagenesis on the samples.It is necessary to consider the effects of depositional environments and diagenesis on these geochemical parameters. 展开更多
关键词 Qiongdongnan Basin trace elements stable ISOTOPE values ANAEROBIC oxidation of METHANE METHANE activity
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Type and distribution of Mid-Permian Maokou Formation karst reservoirs in southern Sichuan Basin,SW China 预览
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作者 HUANG Shipeng JIANG Qingchun +6 位作者 FENG Qingfu WU Ya LU Weihua SU Wang CHEN Xiaoyue REN Mengyi PENG Hui 《石油勘探与开发:英文版》 2019年第2期293-300,共8页
Based on the analysis of the responses of conventional logs such as natural gamma(GR), density(DEN), acoustic interval transit time(AC), compensated neutron(CNL), dual lateral resistivity(Rlld, Rlls), and caliper log(... Based on the analysis of the responses of conventional logs such as natural gamma(GR), density(DEN), acoustic interval transit time(AC), compensated neutron(CNL), dual lateral resistivity(Rlld, Rlls), and caliper log(CAL), combined with drilling data,cores, thin section and productivity of 65 wells, the reservoirs in the Mid-Permian Maokou Formation of southern Sichuan Basin were divided into four types, fractured-vuggy, pore-vuggy, fractured and fractured-cavity. The main reservoirs in high productivity wells are fractured-vuggy and pore-vuggy. The reservoirs of Maokou Formation are generally thin, and can be divided into the upper reservoir segment(layer a of the second member to the third member of Maokou Formation, P2 m^2 a-P2 m^3) and the lower segment(layer b of the second member of Maokou Formation, P2 m^2 b). The two reservoir segments are mainly controlled by two grain beaches during the sedimentation of P2 m^2 a-P2 m^3 and P2 m^2 b, the vertical zonation of karst, and the fractures. The upper reservoir segment is generally better than the lower one in development degree and single well productivity, and is much thicker than the lower one. It is thicker in the Yibin-Zigong-Weiyuan-Dazu area, the southwestern area of Chongqing and the southeastern area of Luzhou, while the lower segment is thicker in the Neijiang-Zigong-Luzhou area and the Dazu-Luzhou area. The areas with big reservoir thickness at tectonic slope or syncline parts are the favorable exploration areas. 展开更多
关键词 SOUTHERN Sichuan Basin Mid-Permian Maokou Formation karst reservoir cavity fracture grain BEACH logging response
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Grading evaluation and prediction of fracture-cavity reservoirs in Cambrian Longwangmiao Formation of Moxi area,Sichuan Basin,SW China 预览
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作者 WANG Bei LIU Xiangjun SIMA Liqiang 《石油勘探与开发:英文版》 2019年第2期301-313,共13页
By using core, thin section, well logging, seismic, well testing and other data, the reservoir grading evaluation parameters were selected, the classification criterion considering multiple factors for carbonate reser... By using core, thin section, well logging, seismic, well testing and other data, the reservoir grading evaluation parameters were selected, the classification criterion considering multiple factors for carbonate reservoirs in this area were established, and the main factors affecting the development of high quality reservoir were determined. By employing Formation MicroScanner Image(FMI) logging fracture-cavity recognition technology and reservoir seismic waveform classification technology, the spatial distribution of reservoirs of all grades were predicted. On the basis of identifying four types of reservoir space developed in the study area by mercury injection experiment, a classification criterion was established using four reservoir grading evaluation parameters, median throat radius, effective porosity and effective permeability of fracture-cavity development zone, relationship between fracture and dissolution pore development and assemblage, and the reservoirs in the study area were classified into grade I high quality reservoir of fracture and cavity type, grade II average reservoir of fracture and porosity type, grade Ⅲ poor reservoir of intergranular pore type. Based on the three main factors controlling the development of high quality reservoir, structural location, sedimentary facies and epigenesis, the distribution of the 3 grades reservoirs in each well area and formation were predicted using geophysical response and percolation characteristics. Follow-up drilling has confirmed that the classification evaluation standard and prediction methods established are effective. 展开更多
关键词 Sichuan Basin Moxi area CAMBRIAN Longwangmiao Formation carbonate rock FRACTURE-CAVITY RESERVOIR RESERVOIR GRADING EVALUATION RESERVOIR PREDICTION
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Depth Distribution Pattern of Soil Organic Carbon in Forest from Taowan Basin of Funiu Mountain Area 预览
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作者 Xifeng NING Lina SONG Yaowu TIAN 《亚洲农业研究:英文版》 2019年第6期20-24,共5页
[Objectives]By testing applicability of SOC depth distribution model in geographical and climatic conditions of Funiu Mountain area,SOC depth distribution model in the region was established and applied. The construct... [Objectives]By testing applicability of SOC depth distribution model in geographical and climatic conditions of Funiu Mountain area,SOC depth distribution model in the region was established and applied. The constructed model was used to estimate SOC mass density in other regions,thereby obtaining SOC abundance distribution chart at different depths.[Methods]165 soil sampling sites were selected from Quercus variabilis forest,Pinus tabulaeformis forest,mixed forest,and shrub forest in Taowan basin of Funiu Mountain area,to determine SOC content at different depths,study SOC depth distribution pattern of forest in Taowan basin of Funiu Mountain area,and assess SOC reserve at different depths.[Results]Average SOC density of Q. variabilis forest,P. tabulaeformis forest,mixed forest,and shrub forest at the depth of 0-20 cm was 7. 92,8. 42,8. 14 and 9. 67 kg/m~2,and there was significant difference in SOC density between shrub forest and Q. variabilis forest,P. tabulaeformis forest,mixed forest( P < 0. 05),and SOC density of four kinds of vegetation all abruptly declined with soil depth increased. At the depth of 0-20 cm,correlation between SOC density and vegetation type,canopy density,clay content and sand content was significant,and the correlation with altitude was insignificant. When carbon density at the depth of 0-100 cm was used to describe regional SOC reserve,the estimated value was lower. The established space model could predict SOC density of forest.[Conclusions]The estimation of deep-layer SOC by the established model needed further consideration,and estimation method for special areas needed to be further demonstrated. 展开更多
关键词 Funiu MOUNTAIN Area Taowan BASIN FOREST Soil ORGANIC carbon DEPTH distribution
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Crude oil mobility and its controlling factors in tight sand reservoirs in northern Songliao Basin, East China 预览
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作者 FENG Jun ZHANG Bowei +9 位作者 FENG Zihui WANG Yachun ZHANG Juhe FU Xiaofei SUN Yonghe HUO Qiuli SHAO Hongmei ZENG Huasen QU Bin CHI Huanyuan 《石油勘探与开发:英文版》 2019年第2期324-334,共11页
Taking tight oil in Gaotaizi and Fuyu oil layers of the Upper Cretaceous Qingshankou Formation in northern Songliao Basin as an example, based on analyses of nuclear magnetic resonance and high pressure mercury inject... Taking tight oil in Gaotaizi and Fuyu oil layers of the Upper Cretaceous Qingshankou Formation in northern Songliao Basin as an example, based on analyses of nuclear magnetic resonance and high pressure mercury injection, experiment methods of supercritical carbon dioxide displacement and extraction are firstly employed to quantify crude oil mobility in tight sand reservoirs with different lithologies and oil contents. The results show that, under the conditions of simulating the Cretaceous Qingshankou Formation in the northern Songliao Basin at a temperature of 76-89 °C and a pressure of 35-42 MPa, the lower limit of the porosity of the movable oil is4.4%, and the lower limit of the permeability is 0.015′10^-3 mm^2. The lower limit of the average pore throat radius is 21 nm. On this basis,a classification standard for three types of tight sand reservoirs is proposed. Type I reservoirs are characterized by the movable fluid saturation larger than 40%, the movable oil ratio(ratio of movable oil to total oil) greater than 30% and the starting pressure gradient in the range of 0.3-0.6 MPa/m;Type II reservoirs are characterized by the movable fluid saturation in the range of 10%–40%, the movable oil ratio in the range of 5%–30% and the starting pressure gradient in the range of 0.6–1.0 MPa/m;Type III reservoirs are characterized by the movable fluid saturation less than 10% in general, the movable oil ratio less than 5%, and the starting pressure gradient greater than1.0 MPa/m. The fluid mobility in tight sand reservoirs is mainly affected by diagenesis and sedimentary environment. Reservoirs with depth lower than 2000 m are dominated by type I reservoir, whereas those with greater depth are dominated by type I and II reservoirs.Reservoirs in inner delta-front facies are dominated by type I reservoir, whereas those in outer delta-front facies and shore-shallow lacustrine facies are dominated by type II and III reservoirs. 展开更多
关键词 northern Songliao Basin TIGHT OIL pore structure crude OIL MOBILITY displacement experiment movable OIL ratio Upper Cretaceous Qingshankou Formation
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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
Technical strategies for effective development and gas recovery enhancement of a large tight gas field: A case study of Sulige gas field, Ordos Basin, NW China 预览
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作者 JI Guang JIA Ailin +4 位作者 MENG Dewei GUO Zhi WANG Guoting CHENG Lihua ZHAO Xin 《石油勘探与开发:英文版》 2019年第3期629-641,共13页
Based on the analysis of influencing factors of tight gas recovery and reservoir geological characteristics, the types of remaining tight gas reserves in the Sulige gas field are summarized from the perspective of res... Based on the analysis of influencing factors of tight gas recovery and reservoir geological characteristics, the types of remaining tight gas reserves in the Sulige gas field are summarized from the perspective of residual gas genesis to estimate residual gas reserves of different types and provide corresponding technical strategies for enhancing gas recovery. The residual gas reserves in the Sulige gas field can be divided into four types: well pattern uncontrollable, horizontal well missing, imperfect perforation, blocking zone in composite sandbodies. Among them, the uncontrolled remaining gas of well pattern and blocking zone in composite sandbodies are the main body for tapping potential and improving recovery factor, and well pattern infilling adjustment is the main means. Taking into account reservoir geological characteristics, production dynamic response and economic benefit requirements, four methods for infilling vertical well pattern, i.e., quantitative geological model method, dynamic controlled range of gas well method, production interference method and economic and technical index evaluation method, as well as a design method of combined vertical well pattern with horizontal well pattern are established. Under certain economic and technological conditions, the reasonable well pattern density of enrichment zone of gas field is proved to be 4 wells per square kilometers, which can increase the recovery rate of the gas field from 32% to about 50%. Meanwhile, five matching techniques for enhancing gas recovery aimed at interlayer undeveloped residual gas have been formed, including tapping potential of old wells, technological technology optimizing of new wells, rational production system optimizing, drainage and gas producing, and reducing waste production, which could increase the recovery rate for 5% based on well pattern infilling. The research results provide effective support for the long-term stable production of 230×108 m3/a of the Sulige gas field and production growth in the Changqing gas a 展开更多
关键词 ORDOS Basin SULIGE GAS field TIGHT GAS remaining reserves well pattern INFILLING enhancing GAS recovery matching technologies
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Influence of depressurization rate on gas production capacity of high-rank coal in the south of Qinshui Basin, China 预览
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作者 SU Xuefeng LIU Yan +3 位作者 CUI Zhouqi ZHANG Jianguo YU Li WANG Kai 《石油勘探与开发:英文版》 2019年第3期642-650,共9页
A desorption simulation experiment with the condition of simulated strata was designed. The experiment, under different depressurizing rates and the same fluid saturation, was conducted on the sample from 3# coal of D... A desorption simulation experiment with the condition of simulated strata was designed. The experiment, under different depressurizing rates and the same fluid saturation, was conducted on the sample from 3# coal of Daning coal mine in Jincheng, Shanxi Province. The gas production rate and pressure change at both ends of the sample were studied systematically, and the mechanisms of some phenomena in the experiment were discussed. The experimental results show that, whether at fast or slow depressurizing rate, the methane adsorbed to high-rank coal can effectively desorb and the desorption efficiency can reach above 90%. There is an obvious inflection point on the gas yield curve during the desorption process and it appears after the pressure on the lump of coal reduces below the desorption pressure. The desorption of methane from high-rank coal is mainly driven by differential pressure, and high pressure difference is conducive to fast desorption. In the scenario of fast depressurization, the desorption inflection appears earlier and the gas production rate in the stage of rapid desorption is higher. It is experimentally concluded that the originally recognized strategy of long-term slow CBM production is doubtful and the economic benefit of CBM exploitation from high-rank coal can be effectively improved by rapid drainage and pressure reduction. The field experiment results in pilot blocks of Fanzhuang and Zhengzhuang show that by increasing the drainage depressurization rate, the peak production of gas well would increase greatly, the time of gas well to reach the economic production shortened, the average time for a gas well to reach expected production reduced by half, and the peak gas production is higher. 展开更多
关键词 Qinshui Basin Fanzhuang BLOCK Zhengzhuang BLOCK high-rank COAL DEPRESSURIZATION RATE gas production RATE simulation experiment gas production capacity
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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
Major breakthrough of Well Gaotan 1 and exploration prospects of lower assemblage in southern margin of Junggar Basin, NW China 预览
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作者 DU Jinhu ZHI Dongming +5 位作者 LI Jianzhong YANG Disheng TANG Yong QI Xuefeng XIAO Lixin WEI Lingyun 《石油勘探与开发:英文版》 2019年第2期216-227,共12页
Well Gaotan 1 was tested a high yield oil and gas flow of more than 1 000 m~3 a day in the Cretaceous Qingshuihe Formation,marking a major breakthrough in the lower assemblage of the southern margin of Junggar Basin. ... Well Gaotan 1 was tested a high yield oil and gas flow of more than 1 000 m~3 a day in the Cretaceous Qingshuihe Formation,marking a major breakthrough in the lower assemblage of the southern margin of Junggar Basin. The lower assemblage in the southern margin of the Junggar Basin has favorable geological conditions for forming large Petroleum fields, including:(1) Multiple sets of source rocks, of which the Jurassic and Permian are the main source rocks, with a large source kitchen.(2) Multiple sets of effective reservoirs,namely Cretaceous Qingshuihe Formation, Jurassic Toutunhe Formation and the Khalza Formation etc.(3) Regional thick mudstone caprock of Cretaceous Tugulu Group, generally with abnormally high pressure and good sealing ability.(4) Giant structural traps and litho-stratigraphic traps are developed. The northern slope also has the conditions for large-scale litho-stratigraphic traps.(5) Static elements such as source rocks, reservoirs and caprocks are well matched, and the dynamic evolution is suitable for large oil and gas accumulation. The lower assemblage of the southern margin of the Junggar Basin has three favorable exploration directions, the Sikeshu Sag in the west part, the large structures in the middle and eastern part, and the northern slope. 展开更多
关键词 southern MARGIN of JUNGGAR Basin WELL Gaotan 1 LOWER ASSEMBLAGE accumulation condition exploration direction
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