摘要
冀中坳陷马西洼槽古近系沙河街组普遍发育异常高压带,异常高压主要发育在沙二段、沙三段,其中沙三上亚段最大压力系数达1.37,且异常压力系数由洼槽向洼缘逐渐降低。烃源岩生排烃是该区形成异常高压的主要原因。异常高压对马西洼槽油气成藏主要有3种作用:一是改善储层;二是增加盖层的封闭性;三是为油气运聚成藏提供动力。在此基础上建立了任东斜坡区高压—中孔岩性—构造油藏、洼槽区高压—中孔构造—岩性油藏及南马庄陡坡区常压—中高孔岩性或构造岩性复合油藏等3种成藏模式。
In Maxi area,abnormal overpressure occurs widely in the lower Tertiary Shahejie Formation, including the second and third members of the Shahejie Formation,especially the upper of the third member of Shahejie Formation with pressure coefficient over 1.37. Laterally,the pressure coefficient decreases from central part of sag to the edge. The major cause of the overpressure is related to the hydrocarbon generation. Three functions of overpressure for hydrocarbon pooling in the sag follow as：improve reservoir prop erty, enhance sealing capability, and provide the power for the deep hydrocarbon migration. Thus, the overpressure is important to hydrocarbon migration. We establish the pattern of overpressure-moderate pore structural petroleum pool in the Rendong slope, the pattern of overpressure-moderate pore-lithological petroleum pool in the central part of Maxi sag, and the pattern of overpressure-moderate and high pore-structural and lithological composite petroleum pool in Nanmazhuang slope.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2012年第4期707-712,共6页
Natural Gas Geoscience
基金
中国石油重大科技攻关项目"成熟探区油气分布规律与精细勘探技术研究"(编号:20011D-07)
中国石油重大科技攻关项目"成熟盆地油气成藏机制与精细勘探目标评价"项目(编号:2011D-0703)联合资助
关键词
马西洼槽
异常高压
油气成藏
成藏模式
Maxi sag
Overpressure
Hydrocarbon accumulation
Accumulation pattern
