【摘要】 小草湖洼陷紧邻生油洼陷,随着研究的深入,勘探层系由中侏罗统三间房组向西山窑组拓展,油气藏类型由构造型向构造-岩性型转变,基于高分辨层序地层分析,综合应用钻井测井、地震资料及分析测试等成果,系统开展油气成藏特征及主控因素分析。研究表明,该区油气成藏受控于构造、岩性、断层三重因素,南北向左旋走滑断层为油气运移提供了良好的通道,辫状河三角洲水下分流河道控制着储集层砂体的平面分布,晚燕山及早喜山期古构造控制油气的运聚及规模;红台—大步构造带东段剩余圈闭多,油气运聚系统良好,砂体发育,是下一步勘探的主要方向。更多还原

【Abstract】 Xiaocaohu Depression is located in the vicinity of oil- generation depression. The exploration strata have been extended from the Middle Jurassic Sanjianfang Fm to Xishanyao Fm,and from structural reservoir to structural- lithologic reservoir. Based on high- resolution sequence stratigraphy analysis,the drilling,logging,seismic and test data are combined to systematically analyze hydrocarbon accumulation characteristics and main controlling factors. Research shows that hydrocarbon accumulation in this area is mainly controlled by structure,lithology and fault. NS left- lateral strike- slip faults provide favorable channel for hydrocarbon transport,braided- river deltaunderwater distributary channels control the plane distribution of reservoir sandbody,and Late Yanshanian and Early Himalayan palaeo- structures control the hydrocarbon migration,accumulation and scale. There are many remaining traps in the eastern Hongtai- Dabu structural belt with favorable hydrocarbon migration and accumulation and well- developed sandbody,which is the main target of further exploration.更多还原