Favorable oil and gas target prediction with time-frequency electromagnetic method in T Basin
Zhao Yidan1, He Zhanxiang2, Zheng Qiugen1, Zhao Zhi2
1. School of Ocean Sciences, China University of Geosciences(Beijing), Beijing 100083, China; 2. GME and Geochemical Survey, BGP Inc., CNPC, Zhuozhou, Hebei 072751, China
Abstract:The differences in resistivity and polarization between oil-bearing traps and non oil-bearing traps are very obvious. Using high-power artificial source to excite electromagnetic field, time-frequency electromagnetic(TFEM) detects the resistivity and polarization anomalies caused by reservoirs, and then detects and evaluates favorable hydrocarbon targets. Through applications on different stages of oil and gas exploration in T Basin, different types of reservoirs are found with diffe-rent polarization anomaly characteristics. More than 68% of our prediction results by this approach in T Basin are proved as being consistent with latter drilling data. This article summarizes also the adaptability and limitation of TFEM.