博兴洼陷沙四段异常压力分布规律及形成机理  

Distribution and formation mechanism of abnormal pressure of fourth member of Shahejie Formation,Boxing Sag

作　　者：吴伟[1,2] 李小梅[2] 邹灵[2] 唐东[2] 刘建磊[2] 

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]中国石化股份胜利油田分公司地质科学研究院,山东东营257015

出　　处：《油气地质与采收率》2008年第3期20-22,共3页Petroleum Geology and Recovery Efficiency

摘　　要：对博兴洼陷沙四段地层压力的分布进行了分析,干酪根的生烃作用是形成异常高压的主要原因,碳酸盐岩的深埋藏溶蚀作用形成了局部地区的异常低压,泥岩的不均衡压实作用和同生断裂的泄压作用等对地层压力分布格局也都产生了一定的影响。沙四段及其上覆的巨厚泥岩盖层符合压力封存箱特征,结合滩坝砂岩油藏的分布,认为博兴洼陷沙四段主要存在以箱内成藏为主、箱缘成藏为辅的成藏模式,异常高压是箱内成藏的主要动力。The analysis of formation pressure distribution of Es4 in Boxing Sag shows that the hydrocarbon generation from kerogen is an important cause of abnormal pressure,and the deep burial disso-lution in carbonate reservoirs formed local abnormally low pres-sure. Disequilibrium compaction of mudstone and pressure relief caused by contemporaneous fault may affect the distribution of formation pressure. The top boundaries of overpressure compart-ments are the thicker mudstone caprocks overlying Es4 ,and the bottom boundaries of that are the mudstones of Es4. By analyzing distribution of the beach bar sandstone reservoirs,the oil and gas of Es4 in Boxing Sag were mainly sealed in pressure compart-ments and seldom at the edge of the pressure compartments. The overpressure of fluids in source rocks is the major drive for hy-drocarbon accumulation.

关 键 词：异常压力 生烃作用 不均衡压实 溶蚀 博兴洼陷 

分 类 号：TE122.1[石油与天然气工程—油气勘探]