东海盆地丽水凹陷异常压力带与油气聚集模式

ABNORMAL PRESSURE BELTS AND HYDROCARBON ACCUMULATION MODELS IN THE LISHUI SAG,THE DONGHAI BASIN

姜亮 金强 葛和平 王伟锋

JIANG Liang JIN Qiang GE He-ping WANG Wei-feng

清华大学 力学系, 北京 100084 2. 中国海洋石油 东海石油公司 研究所, 上海 200030 3. 石油大学, 山东 东营 257061

Mechanism Department, Qinghua University, Beijing 100084, China 2. Donghai Petroleum Company, CNOOC, Shanghai 200030, China 3. University of Petroleum, Dongying, Shandong 257061, China

钻井资料证实,东海盆地丽水凹陷下第三系明月峰组普遍存在异常高压。作者综合了地质、钻井、测井、测试等多方面资料,研究了丽水凹陷异常高压的类型、成因机制及特征,分析了异常高压对油气运聚、成藏机制和油气分布规律的控制作用,总结出在异常高压作用下油气成藏的 3种模式,即在异常高压封隔层之上的砂岩成藏模式、在超压层内部的成藏模式和在封隔层之下的成藏模式。这些模式对油气勘探与开发具有重要的指导意义。

It is proved by well data that abnormal high-pressure exists widely in the Paleogene Mingyuefeng Formation of the Lishui Sag,the Donghai Basin.In this paper,the geologic,drilling,logging and testing data are synthesized,the types,genetic mechanism and characteristics of abnormal high-pressure in the Lishui Sag are studied,and the control action of abnormal high-pressure to hydrocarbon migration and accumulation,pool-forming mechanism and hydrocarbon distribution rules is analysed.At last,three models of hydrocarbon accumulation under abnormal high-pressure are summarized,that is,the sandstone accumulation model above abnormal high-pressure sealing layers,the accumulation model within overpressure layers and the accumulation model under sealing layers.These models have important directive significance to hydrocarbon exploration and development.

中国海洋石油总公司“九五”科技勘探项目(97040203)

https://doi.org/10.11781/sysydz200201048