Prediction Method of Sealing Capacity Distribution of Regional Mudstone Caprocks Damaged by Fault During the Hydrocarbon Accumulation Period

In order to study the distribution law of oil and gas above below regional mudstone caprocks damaged by fault in petroliferous basins, based on sealing mechanism degree during hydrocarbon accumulation period, paleo-juxtaposition thickness caprock was calculated determining paleo-fault throw faults paleo-thickness period. According relation between at known well points area caprock, maximum juxtaposition required for upper lower connection fault-associated fracture zone determined. On this basis, a set prediction methods capacity period established. Then, method applied damage Zhangdong Fault middle sub-member first member Shahejie Formation late depositional periods Minghuazhen Formations Qikou Sag Bohai Bay Basin The results show that is large. largest appears east, with an a-value greater than 1, followed west, 0.5 1. relatively minor occurs west part, less 0.5. part conducive preservation generated from source rock underlying third Formation, which consistent fact discovered near are mainly distributed its part. It shows feasible predict