成藏期剩余压力与储层排替压力下限耦合恢复油气成藏过程——以济阳坳陷车西洼陷为例  

Reconstruction of hydrocarbon accumulation process by the matched relationship between surplus pressure and lower limit of reservoir displacement pressure in the hydrocarbon accumulation period:Taking Chexi Sag in Jiyang Depression as an example

作　　者：蒋有录[1] 万涛[1] 林会喜[2] 彭传圣[2] 

机构地区：[1]中国石油大学地球资源与信息学院,山东青岛266555 [2]中国石化胜利油田分公司地质科学研究院,山东东营257015

出　　处：《石油学报》2011年第2期265-272,共8页Acta Petrolei Sinica

基　　金：国家科技重大专项(2008ZX05006)资助

摘　　要：通过对济阳坳陷车西洼陷主要油田储层孔喉半径与含油气性关系的研究,确定了现今储层排替压力下限,结合地层沉积速率和压实模型,得到了不同时期储层排替压力下限。基于成藏期剩余压力与储层排替压力下限的耦合关系恢复了研究区主要油田源下油气藏的形成过程。在古近系东营组沉积末期有少量油气充注,在馆陶组沉积中期生烃范围恢复到东营组剥蚀期前的水平并再次充注,主体油藏大规模聚集形成于明化镇组沉积早期,南部斜坡带的潜山油气藏成藏期最晚,为明化镇组沉积末期(距今2Ma左右)。根据成藏期油气运聚动力与阻力的耦合关系,预测源下油气藏分布范围为明化镇组沉积末期沙三段底部剩余压力大于0.6MPa的地区。Based on the study of the relationship between the reservoir throat radius and petroliferous property in main oilfields of the Chexi Sag in the Jiyang Depression,the lower limit of displacement pressure for the present reservoirs was determined,and integrated with the deposition rate of formations and the compaction model,the lower limit of reservoir displacement pressure in different phases was then acquired as well.A hydrocarbon accumulation process of reservoirs under source rocks in the main oilfields of the Chexi Sag was reconstructed based on the matched relationship between surplus pressure and the lower limit of displacement pressure in the accumulation phase.The study result indicated that hydrocarbon accumulation at the end of the Dongying stage in Paleogene was limited,and the hydrocarbon generation domain of source rocks was restored in the middle Guantao stage as it used to be before the denudation at the terminal Dongying stage.A hydrocarbon accumulation phase of the main reservoirs occurred mainly in the early Minghuazhen stage（5Ma before present）,and the latest phase occurred in buried-hill oil-gas reservoirs of the southern slope zone at the terminal Minghuazhen stage（2Ma before present）.Based on the matched relationship between the driving force and resisting force of hydrocarbon migration and accumulation at the early Minghuazhen stage,the largest oil domain under source rocks was expected probably at the bottom of Es3 deposited at the terminal Minghuazhen stage,where surplus pressure is higher than 0.6MPa.

关 键 词：剩余压力 储层排替压力下限 油气成藏过程 源下油气藏 车西洼陷 济阳坳陷 

分 类 号：TE112.3[石油与天然气工程—油气勘探]