ON INDIRECT AFFECT OF ABNORMAL PORE FLUID PRESSURE TO THE SEAL OF GAS IN EACH PHASE
异常孔隙流体压力对各种相态天然气的间接封闭作用

Based on the study Ot tne formation mechanism and conditions of abnormal pore fluid pressure.The affect of abnormal pore fluid pressure to the seal of gas in each phase was deeply studied. Abnormal pore fluid pressure was considered not to seal gas in free phase directly, it can play an indirect role in sealing gas in free phase through increase of capillary seal ability of mudstone caprock. Abnormal pore fluid pressure was considered not also to seal gas in water-dissolving phase directly, it can play an indirect role in sealing gas in water-dissolving phase through increase of adsorptive fore of mudstone caprock. Abnormal pore fluid pressure was considered not to seal gas in diffusion phase directly, it can play an indirect role in sealing gas in diffusion phase through the formation of abnormal gas-bearing concentration of mudstone caprock.