准噶尔盆地车排子周缘油气输导体系特征及输导模式  

Characteristics of the hydrocarbon pathway system and transport model of the Chepaizi and its surrounding areas in the Junggar basin of China

作　　者：吴康军[1,2] 刘洛夫[1,2] 肖飞[1,2] 周长啸 徐正建[1,2] 

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油大学(北京)盆地与油藏研究中心,北京102249

出　　处：《中国矿业大学学报》2015年第1期86-96,共11页Journal of China University of Mining & Technology

基　　金：国家科技重大专项(2011ZX05003-001)

摘　　要：在分析车排子周缘油气藏分布特征的基础上,综合基础地质资料和分析化验数据,运用现代油气运移理论及地球化学示踪等技术,对本区的油气来源、输导通道、运移方向等进行精细研究,明确了各层系油气输导体系特征及输导模式,认为车排子周缘石炭系以上的地层总体具有西北部为浅层,东南部埋深较大的特征,而油气来自于东南部凹陷的深层.研究结果表明:新近系沙湾组稀油主要来源于侏罗系八道湾组煤系烃源岩,且可能有湖相原油的混源,白垩系清水河组和侏罗系八道湾组为同一类原油,均来自于二叠系乌尔禾组烃源岩;沙湾组、清水河组和八道湾组砂体砂地比均值分别为0.50,0.25和0.40,3个层位的砂体可作为油气侧向运移的通道;白垩系和侏罗系底部不整合面有油气显示的井都位于孔隙度为10%的区域内,是油气侧向运移的优势通道;地球化学参数示踪的油气运移方向指向砂体砂地比的高值区和不整合面孔隙度的高值区;石炭纪—侏罗纪发育的深大逆断层沟通了油源,而后期发育的正断层对油气藏起到了调整和改造作用.油气从深部向浅层、从凹陷向凸起的高部位运移而聚集成藏.深部的油气藏,输导体系单一,越靠近浅层,其输导体系越复杂.Based on the analysis of the reservoir distribution characteristics of Chepaizi and its surrounding areas,which combines the basic geologic information and test data,modern hydrocarbon migration theory and geochemical tracer techniques are adopted to investigate the oil-source,migration paths and direction of hydrocarbon in this study area.The features and model of the hydrocarbon migration system in each formation are certified.The burial depth of the strata above Carboniferous is shallower in the northwest and deeper in the southeast,and there is a hydrocarbon supply from the deep sag in the southeast.The results indicate that the light oil in the Neogene Shawan formation issourced from coal source rock of the Jurassic Badaowan formation,which may be mixed with some oils from lacustrine source rocks.Oil that accumulated in the Cretaceous Qinshuihe formation and Jurassic Badaowan formation are sourced from the source rock of Permian Wuerhe formation.The average thickness ratio of sand layer over total strata in the Shawan,Qinshuihe and Badaowan formations are0.50,0.25 and 0.40,respectively.Their sand bodies can be considered to be the preferred paths for hydrocarbon migration in the lateral direction.The wells with oil shows within unconformities at the bottom of Cretaceous and Jurassic are located in the area with porosity higher than 10%,indicating that the unconformities are suitable paths for hydrocarbon migration in the lateral direction.The geochemical tracer parameters show that the hydrocarbon migration direction points to the sand bodies with higher thickness ratio and unconformities with higher porosity.The deep and large thrust faults formed in the Carboniferous-Jurassic connect the hydrocarbon generation center with the accumulation areas.The normal faults subsequently developed exhibit a satisfactory adjustment and reforming effect to the hydrocarbon reservoirs.Hydrocarbon migrates from deep to shallow and from sag to uplift and subsequently accumulates in the higher positions of structures.The hydr

关 键 词：油源对比 油气运移 输导体系 车排子周缘 准噶尔盆地 

分 类 号：TE121[石油与天然气工程—油气勘探]