Reservoir monitoring feasibility study with time lapse magnetotelluric survey in Sebei Gas Field
Hu Zuzhi1,2, He Zhanxiang1, Li Dechun1, Liu Yunxiang1, Sun Weibin1, Wang Caifu1, Wang Yongtao1
1. Non Seismic Department, BGP Inc., CNPC, Zhuozhou, Hebei 072751, China;
2. Institute of Geophysics and Geomatics, China University of Geosciences (Wuhan), Wuhan, Hubei 430074, China
Abstract：A time lapse electromagnetic survey was conducted in Sebei 2 Gas Field in Qaidam Basin for reservoir monitoring. Four continuous electromagnetic profiling (CEMP) lines with 199 sounding stations were laid out. Remote reference stations were used to suppress noise in the field. The techniques of high sampling of frequency to increase the data, fidelity static shift correction and high resolution two-dimensional inversion methods were adorted, which could improve greatly inversion resolution. For the time lapse magnetotelluric data, inversion sections show distinct high resistance characteristics in Sebei-2 Gas Field, which is very helpful for reservoir monitoring. The inversion results of the first survey data agree very well with the logging data, and the predicted boundaries and thickness of gas reservoir are consistent with drilling data. The inversion results of the second survey show that gas reservoir decreases from shallow to deep. All of These results indicate that time lapse magnetotelluric survey is feasible for reservoir monitoring. The third monitoring surveys will be carried out in the near future.
胡祖志, 何展翔, 李德春, 刘云祥, 孙文斌, 王财富, 王永涛. 涩北气藏时移大地电磁监测技术可行性研究[J]. 石油地球物理勘探, 2014, 49(5): 997-1005.
Hu Zuzhi, He Zhanxiang, Li Dechun, Liu Yunxiang, Sun Weibin, Wang Caifu, Wang Yongtao. Reservoir monitoring feasibility study with time lapse magnetotelluric survey in Sebei Gas Field. OGP, 2014, 49(5): 997-1005.
