车西洼陷南坡油气成藏和富集的主控因素  

Main controlling factors of hydrocarbon accumulation and enrichment in the southern slope of Chexi sag

作　　者：万涛[1] 蒋有录[1] 林会喜[2] 彭传圣[2] 毕彩芹[2] 

机构地区：[1]中国石油大学地球资源与信息学院,山东东营257061 [2]胜利油田地质科学研究院,山东东营257015

出　　处：《中国石油大学学报（自然科学版）》2010年第6期38-44,共7页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家科技重大专项课题(2008ZX05006);国家自然科学基金项目(40972094)

摘　　要：依据地质录井、岩心压汞测试和地层测试等资料,应用生长断层活动性和封闭性的定量评价、岩石薄片分析和盆地模拟恢复古压力等方法,对车西洼陷南坡油气成藏和富集的主控因素进行定量分析。结果表明:馆陶组沉积期油源断层的活动时间和活动部位控制源上油气藏油气富集程度和宏观分布;研究区形成断层侧向封堵的条件为泥岩涂抹势大于22,泥岩涂抹因子小于1.5,断层泥比率大于0.73,沙二段底部、沙三上亚段和沙四上亚段达到断层侧向封堵条件;源下油气成藏主要受储层孔喉半径和成藏期沙三段底部剩余压力控制,沙四上亚段储层孔喉半径大于0.24μm,储层埋深小于4.0 km的沉积有利相带发育区为有利储层发育地区;源下油气藏含油边界附近,在明化镇组沉积末期(距今2 M a)存在沙三段底部剩余压力与储层排替压力下限的耦合关系,据此预测源下油气藏含油范围为明化镇末期沙三段底部剩余压力大于0.6 MPa的地区。Based on the data of geological logging,core mercury injection test and formation test,the quantitative analysis on the main controlling factors of hydrocarbon accumulation and enrichment in the southern slope of Chexi sag was studied by using technologies of quantitative evaluation of fault-activity and fault-seal,rock thin section analysis and reconstructed paleo pressure by basin modeling.The following are the conditions of fault-seal formation：The hydrocarbon accumulation degree and macroscopic distribution of reservoir upper source rock were controlled by the source faults activity time and site of Guantao formation.Clay smear potential is more than 22,and shale smear factor is less than 1.5,and smear gouge ratio is more than 0.73.The bottom of Sha 2 member,Sha 3 and Sha 4 upper subinterval match the conditions.The hydrocarbon accumulation of reservoir under source rock is controlled by pore throat radius of reservoir and surplus pressure in the bottom of Sha 3 member during the period of reservoir formation.Favorable reservoir of Sha 4 upper subinterval is located in the area where the pore throat radius is more than 0.24 μm and the buried depth of reservoir is less than 4 km and favorable sedimentary facies belt develops.Near the boundary of reservoir under source rock,surplus pressure and reservoir displacement pressure limitation in the phase of reservoir-forming are matched.Based on this,it can be predicted that the probable oil domain of reservoir under source rock is the stratum of late Minghuazhen formation sedimentary period（2 Ma before present） in the bottom of Sha 3 member whose surplus pressure is higher than 0.6 MPa.

关 键 词：车西洼陷 断层侧向封堵 油源断层 剩余压力 孔喉半径 含油范围 

分 类 号：TE122.1[石油与天然气工程—油气勘探]