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在浅水环境中,利用频率域海洋可控源电磁法探测油气藏薄层面临着挑战,这是因为空气波支配着电磁响应而它只含有少量海底电阻率结构的信息.本文研究了空气波对时间域可控源电磁(CSEM)响应的影响.空气波到达时间取决于海水深度.在浅水区空气波到达早,而在深海水区空气波到达晚,空气波与来自深部电阻体的电磁波出现在不同时间段.虽然在中等深度的海水区空气波和来自深部电阻体的电磁信号几乎同时到达,但与不含有油气藏的背景模型相比,仍可以看到明显的异常.浅水区勘探的好处在于可以使用表面拖曳系统.
In shallow water environment, it is challenge to detect thin reservoirs by frequency-controlled oceanic controlled source electromagnetic method because the airwaves are dominated by electromagnetic response and contain only a small amount of information about the resistivity structure of seafloor.In this paper, Time Domain Controlled Source Electromagnetic (CSEM) Response The arrival time of the airwaves depends on the seawater depth.When the airwaves arrive early in the shallow waters, and the airwaves arrive late in the deep seawater, the airwaves and the electromagnetic waves from the deep resistive body appear At different time intervals, significant air anomalies can still be seen compared to background models without oil and gas reservoirs, although the air waves in the seawater zone at moderate depths and electromagnetic signals from deep resistive bodies arrive almost simultaneously. The advantage is that you can use surface drag system.