Luo Shengyuan1, He Sheng1, Song Guoqi2, Wang Yongshi2, Hao Xuefeng2, Jin Qiuyue3
1. Key Laboratory of Tectonics and Petroleum Resource of Ministry of Education, China University of Geosciences (Wuhan), Wuhan, Hubei 430074, China;
2. Shengli Oilfield Branch Co., SINOPEC, Dongying, Shandong 257015, China;
3. Zhanjiang Branch, CNOOC, Zhanjiang, Guangdong 524057, China
Abstract:Overpressures are commonly observed in the third and fourth member of Shahejie (Es3 and Es4) formations in Bonan Sag, Zhanhua Depression. The optimized and calibrated velocity data along with the Fillippone formula pressure prediction model have been used to predict formation pressure in Bonan Sag. VSP and logging information is used to calibrate seismic velocity, which reduces greatly velocity error and the uncertainty of pore pressure prediction. After determining the model parameters of the study area, we obtain each maximum and minimum velocity of seismic velocity spectrum. Using corrected seismic data and predictive models, we get the pore pressure 3D modeling. It offers a comprehensive picture by showing the overall variation in 3D view and reveals a comprehensive understanding of the pressure distribution at any direction slice. The pressure prediction may cause errors due to inaccurate seismic velocity and low seismic resolution. For our applications, 82 percent of the predictions are within an error less than 10 percent, which can meet the requirements of the exploration in the area.