RELATIONSHIP BETWEEN FAULT SYSTEMAND ABNORMAL PRESSURE DISTRIBUTIONIN CONTINENTAL FAULT BASIN—A CASE STUDY OF THE DONGYING SAG OF JIYANG DEPRESSION OF BOHAI BAY BASIN

Continental fault basinis an important basin type in the east of China,and is significant for oil exploration and production.It is characterized by abnormal fluid pressure extensively formed in deep formation and complex fault system.Study of the mutual action of these two characteristics is helpful for the analysis of oil migration and accumulation.Based on the analysis of fluid pressure and fault characteristics of continental fault basin,a precise model of abnormal pressure distribution in sag is made.It is also discussed in this paper the spatial relationship between fluid pressure and fault system and the influence of fault system on vertical distribution of fluid pressure as well as the sealing characteristics.