摘要
本文讨论了在压实作用下孔隙流体压力的形成以及与流体排驱的关系,指出异常孔隙流体压力是因岩石渗透率变化引起毛细管力增加而产生的,且二者之间在流体压力孕育过程中一直维持一个动态平衡状态。对于连续沉积的盆地,只有当异常孔隙流体压力增加到超过岩石的抗剪强度时,因岩石发生剪切破裂导致毛细管力降低,流体才被排出;对于强烈构造变动的盆地,因地层大量剥蚀引起负荷压力降低,其降低幅度达到或超过岩石的抗张强度时,岩石亦会破裂,并促使流体被排出。
In this paper the authors discuss the relationship between the pore fluid pressure and the fluid expulsion under the compaction, and suggests that the abnormal pore fluid pressure results from the increase of the capilary force due to the change of permeability and that a dynimic balance is maintained between them during the pregnancy of the fluid pressure. In sedimentary basins where deposition is continuous, when the abnormal pore fluid pressure exceeds the rock's shear strength, the capillary force will be decreased as a result of shearing fracturing of the rock, and the fluid will be expelled. Basins where intensed structural disturbance has occurred, when the decreased amplitude of load pressure reaches and exceeds the rock's tension strength because of a great amount of erosion, tension fissures will be produced in the rock and the fluid will be expelled.
出处
《地质论评》
CAS
CSCD
北大核心
1997年第3期297-302,共6页
Geological Review
关键词
泥岩压实
孔隙流体压力
流体排驱
油气运移
shale compaction, capillary force, pore fluid pressure, dynamic balance, fluid expulsion
