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苏北盆地高邮凹陷古近系戴南组沉积相及其对隐蔽油气藏的控制 预览 被引量:55

Sedimentary facies and its controlling on subtle oil and gas reservoirs of the Dainan Formation of Paleogene in Gaoyou Sag,Subei Basin
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摘要 苏北盆地高邮凹陷是江苏油田的主要油气勘探开发区,是一个南断北超的典型箕状断陷湖盆,其中的古近系戴南组为一套厚度近2 000 m的河湖相砂泥岩地层,从下到上分为一段和二段.通过沉积充填分析和沉积相编图,戴南组一段沉积时,苏北盆地断陷构造活动相对强烈,地形高差大,水体相对较深,水体范围相对较小,从南向北分别发育近岸水下扇、湖底扇、三角洲等沉积相类型.戴南组二段沉积时,断陷构造活动有所减弱,地形高差变小,水体相对较浅,水体范围扩大至整个凹陷,从南向北分别发育扇三角洲、湖底扇、三角洲等沉积相类型.利用砂岩等厚图等资料,确定了戴南组的沉积相图.沉积相在平面上分布范围明确,纵向上既有差异性又有继承性.高邮凹陷边缘和内部的同沉积断层对沉积相和砂体的发育分布起着重要的控制作用,沉积相控制了油气分布,特别是对隐蔽油气藏的形成起重要作用.高邮凹陷戴南组的隐蔽圈闭类型主要有地层超覆、断层-岩性、砂岩上倾尖灭及透镜体圈闭等.湖底扇、三角洲前缘、扇三角洲前缘、近岸水下扇中扇等为有利的储集岩相带.结合石油地质条件的分析,确定了联18-马18井区等几个有利的隐蔽油藏勘探区. The Gaoyou Sag of the Subei Basin is one of the important oil and gas exploration a nd development areas in Jiangsu Oilfield,and is a typical dustpan shaped subside nce lacustrine basin with a fault as its south boundary and a slope to the north .The Dainan Formation in the Gaoyou Sag is 2 000 m thick and mainly compris es flu vial-lacustrine sandstone and mudstone,and is divided into 2 members.Sedimenta ry filling process of the Dainan Formation was an alyzed and sedimentary facies maps were drawn.During the sedimentary period of Member 1,the tectonic activity of the basin was comparatively stronger and altitude diffe rence between the boundary and the sag was relatively bigger. The water was deeper and the scope of water was smaller.Consequently,proximal subaqueous fan, sublacustrine fan and delta facies were developed from south to north respectively.When the Member 2 of the Dainan Formation was deposited, the tec tonic activity was comparatively weaker and altitude difference between th e boun dary and the sag became smaller.The water was shallower and the sag was entire l y covered by the water.Consequently,fan delta,sublacustrine fan and delta f acies were developed from south to north respectively.Based on the isoline ma ps of sandstone and other data, the maps of sedimentary facies of the Dainan Formation were drawn.The sedimentary facies were developed in specific places in plan e and shows differences and inheritance in vertical evolution.The syndeposit ional faults,either as boundary or within the Gaoyou Sag,are key factors cont rolling the distribution of sedimentary facies and sandbodies.The developme nt of sedimentary facies controls the development and distribution of oi l and gas res ervoirs,especially subtle ones.The main subtle traps of the Dainan Formatio n in Gaoyou Sag mainly include stratigraphic overlap,fault-lithologic,upwar d thinout and lenticular ones.The favorable oil-bearing facies belts i nclude subla custine fan ,delta front,fan delt
作者 张喜林 朱筱敏 钟大康 梁兵 曹冰 杨立干 Zhang Xilin 1 Zhu Xiaomin 1 Zhong Dakang 1 Liang Bing 2 Cao Bing 2 Yang Ligan 2 1 Faculty of Resources and Information,China University of Petroleu m,Beijing 102249 2 Geological Research Institute of Jiangsu Oilfield Branch Company,SINOPEC,Yangz hou 225009,Jiangsu
出处 《古地理学报》 CAS CSCD 2005年第2期 207-218,共12页 Journal of Palaeogeography
基金 中国石油化工集团公司资助项目
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