Time-lapse seismic applications in China offshore gas fields
ZHOU Jia-xiong1,2, XIE Yu-hong2, CHEN Zhi-hong2, Martin Riviere3, LIU Wei-wei2, SUN Yue-cheng2
1 School of Resources,China University of Geosciences,Wuhan,Hubei,430074;China;
2 CNOOC Ltd.Zhanjiang,Zhanjiang,Guangdong, 524057; China;
3 BP China E&P Company,Shenzhen,Guangdong,518067,China
Abstract：The paper presents time-lapse seismic practices in YC13-1 and DF1-1,two offshore gas fields in South China Sea.The drained blocks and residual gas distribution of YC13-1 Gas Filed are predicted by time-lapse seismic data interpretation combined with core measurement.Based on YC13-1 time-lapse seismic study,a systemic time-lapse seismic study of DF1-1 Gas Field is conducted.In the study,several difficulties have been overcome: dataset matching in time-lapse data processing,calibration of time-lapse data with well information,and pressure decrease in blocks while the gas saturation and the gas water contact unchanged.The time-lapse seismic results are applied to update depletion plan,and the new data show it will get better recovery and better benefits.
