苏北盆地高邮凹陷断层-岩性油藏断层封闭性研究

Fault sealing study on fault-lithologic reservoirs in Gaoyou Depression of Subei Basin

董才源 刘震 李储华 刘启东

中国石油勘探开发研究院，北京 100083 中国石油大学（北京）油气资源与探测国家重点实验室，北京 102249 中国石化江苏油田分公司地质科学研究院，江苏 扬州 225009

基于苏北盆地高邮凹陷戴南组断层-岩性油藏断层现今与成藏期垂向正应力研究，分析了断层垂向封闭性演化规律。高邮凹陷主要断层-岩性复合油藏现今断层正应力分布在13.8~25.0 MPa，断层垂向封闭性正应力临界值为13.8 MPa，成藏期正应力分布于8.9~20.2 MPa，多数控藏断层成藏期开启作为输导通道，现今封闭成为遮挡条件，但偶有例外，邵深1油藏控藏断层成藏期与现今皆封闭，此类油藏极有可能自生自储。

Fault sealing evolution is analyzed based on the normal stress calculation of Dainan Formation reservoir. The favorable area of fault-lithologic reservoirs is predicted in Gaoyou Depression of Subei Basin. It is concluded that the present normal stress of major faults in fault-lithologic reservoirs is from 13.8 to 25 MPa and the critical value of fault sealing is 13.8 MPa. The normal stress of faults in fault-lithologic reservoirs in accumulation period is from 8.9 to 20.2 MPa, most of the reservoir faults are open in the accumulation period, but they are closed now. However, there is one reservoir with fault sealing all the time, which is Shaoshen 1 reservoir thought to be the own source type.

10.6056/dkyqt201306002