摘要
通过测井分析、岩心观察、"四性关系"(岩性、物性、电性、含油性)研究以及试油、试采数据分析,结合构造特征解析,总结了鄂尔多斯盆地姬塬油田红井子地区长9油层组的石油富集规律。长7烃源岩生成的油气以流体过剩压力为主要驱动力,通过孔隙和裂缝运移至长9储层;长7烃源岩排烃强度有限、动力不足,使油气无法完全充满长9储层,而长9内部普遍发育的底水进一步阻碍了油气向下运移;长9顶部稳定发育的隔层为油气聚集提供了必要的遮挡条件,少部分油气在长9内部夹层发育部位聚集;在具备有效遮挡的条件下,受岩性与物性的控制,油气优先聚集在长91顶部物性条件好的储层中。从砂体顶面构造与试油、试采效果关系来看,构造起伏对长9油气聚集的影响不大。
The paper summarized the hydrocarbon accumulation pattern in the formation based on analysis of logging and core data,relationship among lithology,physical property,electrical property and oil-bearing situation,as well as formation test and production test results from the Chang-9 reservoir in the Yanchang Formation of the Hongjingzi block in Jiyuan oilfield,Ordos Basin.It is suggested that the oil and gas generated in source rocks of the Chang-7 layer were mainly driven by the excess flow pressure inside and migrated to the Chang-9 reservoirs through pores and fractures.However,the hydrocarbon expulsion in Chang-7 was not strong enough to fully fill up the Chang-9 reservoirs.In addition the bottom water widely developed in the Chang-9 reservoirs impeded the further downward migration of hydrocarbons.The top barriers inside the Chang-9 provided the sealing conditions necessary for hydrocarbon accumulation in the reservoirs,resulting in the enrichment of some hydrocarbons in interlayers inside the Chang-9.Hydrocarbons might first accumulate in top layers of the Chang-91 where the physical properties were more favorable due to the dual control of lithology and physical properties.The relationship between structure features and formation testing as well as production testing results demonstrates that the structural relief has very little effect on oil and gas accumulations in the Chang-9 reservoirs.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
2012年第5期758-765,共8页
Oil & Gas Geology
基金
国家重点基础研究发展计划("973"计划)项目(2003CB214603)
关键词
隔层
烃源岩
石油富集规律
延长组
姬塬油田
鄂尔多斯盆地
barrier
source rock
hydrocarbon accumulation pattern
Yanchang Formation
Jiyuan oilfield
Ordos Basin
