广域电磁法在湘西北海相页岩气勘探中的应用

Marine shale gas exploration with wide field electromagnetic method in north-western Hunan

广域电磁法在南方山地有着探测深度大、效率高等优势,在油气资源勘探中有着重要的作用.广域电磁法可以在过渡带进行测量,以较小的收发距探测较大的深度,提高了精度和野外效率.湘西北海相页岩气探测揭示了该区碳质页岩的含碳量较高,相对上、下地层显示为低阻的特征.对测区六条测线进行了数据处理,形成的视电阻率断面图与地震剖面对比显示广域电磁法的探测效果明显.

Wide field electromagnetic method can be used in reservoirs exploration with large penetration depth and high efficiency. The results show that the method can be used to measure in transition zone, achieving a large penetration depth can be achieved with a small distance between transmitting and receiving,and the accuracy and efficiency was highly improved. Wide field electromagnetic method was applied for carbonaceous shale exploration in Hunan province, China. The carbonaceous shale shows as low resistivity because of its high carbon content. Six profile data has been process and interpret,and also the resistivity profile was basically same to the seismic section profile. The results show that the wide field electromagnetic method is effective for carbonaceous shale distribution detection.