摘要
东濮凹陷具有东西分带、南北分区的构造—沉积格局。综合分析拉张速率与断陷速率的比值以及火山岩分布认为,在沙三段沉积时期东濮凹陷北部的拉张速率小而断陷速率大,且火山岩不发育,有利于烃源岩的大规模发育,而南部地区则相对不利于烃源岩的大量发育。通过分析研究区构造—沉积演化对储、盖层空间组合以及油气运移、成藏模式的影响认为,东濮凹陷发育异常压力,从洼陷带向中央隆起带和西部斜坡带,其压力逐渐降低,致使中央隆起带和西部斜坡带具有油气运聚的水动力学背景,为离心流的指向区,有利于油气在浮力作用下聚集成藏。研究区北部地区的生储盖组合和运聚条件均优于南部地区,北部地区更有利于油气的富集成藏。
The structural-depositional framework of Dongpu sag has a zonation from east to west and north to south.Through comprehensive analysis on the ratio of extensional and downfaulted rate and volcanic distribution,it is suggested that depositional period in Sha3 member is favorable to large-scale development of the hydrocarbon source rocks due to the small extensional rate and fast downfaulted rate and inactive volcanic activity in the north of Dongpu sag;thus that the south of Dongpu sag is not good for the development of the hydrocarbon source rocks in comparison.The structural-depositional evolution in the research area has impact on spatial combination of reservoirs and cap rocks and oil-gas migration and accumulation model.Abnormal pressure develops in Dongpu sag and the pressure decreases gradually from the subsag belt to the central uplift belt and western slope belt.So the central uplift belt and western slope belt become the directional areas of centrifugal flow that can provide favorable hydrodynamic condition for oil-gas accumulation under the role of buoyancy.The northern research area is more favorable for oil-gas accumulation than the south for better source-reservoir-seal combination and migration-accumulation conditions.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2014年第4期50-53,57,共5页
Petroleum Geology and Recovery Efficiency
关键词
构造格局
沉积演化
拉张速率
断陷速率
浮力
油气成藏模式
东濮凹陷
structural framework
depositional evolution
extensional rate
downfaulted rate
buoyancy
oil-gas accumulation model
Dongpu sag
