ANALYSIS ON THE COUPLING OF SUBSIDENCE PROCESSES, MAGMATIC ACTIVITIES, TEMPERATURE-PRESSURE FIELD EVOLUTION AND HYDROCARBON ACCUMULATION IN THE NANPU SAG OF THE BOHAIWAN BASIN

The Nanpu Sag,which is located in the northern part of the Huanghua Depression in the Bohaiwan Basin,is a hydrocarbon-bearing sag developed since the Cenozoic.It went through faulting and depression two evolutionary stages.The denudation restoration showed that the infilling of the basin had "e pisodic" subsidence features.By studing on magmatic activities and temperature-pressure field evolution as well as their relations to subsidence ratio,the time sequence of magmatic activities in basin evolution and its coupling relation to sedimentation were determined,and the relationship between magmatic activities and the ancient temperature-pressure field evolution of the basin was distinguished.This will provide new and important research thought and means for the recognition of hydrocarbon accumulation conditions.