TFEM探测JZ地区潜山内幕目标的模拟及试验

Target detection simulation and experiments in buried hills with TFEM method

针对JZ地区的潜山内幕油气勘探目标,探讨时频电磁法探测的有效性。根据该区已知资料建立地质模型,开展目标体位于不同构造位置、具有不同规模以及与围岩电阻率存在不同差异等情况下的正演模拟,得到其电场水平分量振幅曲线及去除背景场后的纯电场水平分量振幅断面图。对结果进行分析,了解了潜山内幕目标产生的电磁异常规律;与实测结果进行比较,讨论了探测内幕目标的可行性。野外试验结果证实,使用时频电磁法能够有效探测到潜山内幕含油气目标。

We discuss in this paper the feasibility for buried hill reservoir detection with time-frequency electromagnetic(TFEM)method.First we build a geological model based on the available data in JZ region,then conduct forward modeling of targets with different sizes and resistivity at different positions in buried hills.Both electric field amplitude curves and pure amplitude profiles without background are obtained in different situations.We analyze electromagnetic anomaly of buried hills.Field experiments were conducted for testing the feasibility.The results demonstrated that oil-saturated targets in buried hills can be characterized by time-frequency electromagnetic responses.