Study on the Mechanism of Abnormal Pressure and Pressure Detection Method after Drilling for Xihu Depression in the East China Sea

The interpretation accuracy on the formation pressure in the deep layers of Xihu Depression is low in the East China Sea. In order to solve this problem, beginning from tectonic evolution history, study about the mechanism of abnormal pressure has been conducted, and detection method of pressure after drilling has been optimized. The study results indicated that the optimized method of pressure is high in accuracy, and can meet the requirements for post drilling evaluation.