时频电磁法勘探在尼日尔A区块的应用效果

TFEM applications in the Block A,Niger

尼日尔A区块地层介质纵向电性差异及流体极化效应明显,有利于应用时频电磁法勘探。根据此方法在该区可提取多种反映油气异常的参数,如极化参数、频率相关参数、时间常数、相位异常、振幅异常及电阻率异常。根据上述多种异常参数结合已知井的钻井结果进行分析,并制定利用上述异常参数评价油气显示的标准和原则,由此划分异常区带,以指导油气勘探,见到了较好的效果。

There are vertical obvious differences of electric property and polarization effect of fluid in earth layer medium in the Block A,Niger.Therefore a TFEM survey was conducted,which provide some hydrocarbon anomaly parameters,such as polarization anomaly,frequency correlation coefficient,time constant,phase and amplitude anomaly,and resistivity anomaly.The hydrocarbon indication standard and principle made by the integrated analysis of hydrocarbon anomaly parameters.And the previous drilled well results were used to classify the anomaly zones and guide the hydrocarbon exploration.Good results have been achieved by this approach in the Block A,Niger.