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海洋可控源电磁法的探测资料能有效反映海底油气藏的信息,但在实际应用中,特别是浅海环境下,空气波对测量资料有严重影响。空气波的影响会对可控源电磁法的数据处理结果带来差错。因此,开展抑制空气波的研究对海洋可控源电磁法的实际应用具有重要意义。为抑制空气波干扰,本文提出了一种可有效增大接收站距的合成源三维反褶积干涉法,获得大地反射响应的相对异常系数,同时分析了该方法对空气波的抑制能力。仿真结果与传统方法进行对比分析,验证了本文方法的有效性。通过仿真分析,本文给出合成源长度的选择方法,考察了海水深度对本文方法的影响,并给出相关结论。本文研究成果表明合成源条件下的大地反射响应可有效抑制空气波干扰,并能显著提高海洋可控源电磁法对高阻油气资源的探测能力;此外,本文研究成果将有助于海洋可控源电磁法系统设计中合成源长度和接收站距等参数指标的确定,也为未来海洋可控源电磁法中应用合成源三维反褶积干涉法提供理论基础。
The detection data of oceanic controlled source electromagnetic method can effectively reflect the information of submarine reservoirs, but in practical applications, especially in the shallow sea environment, the air wave has a serious impact on the measurement data. The effects of air waves can cause errors in the data processing results of the controlled source electromagnetic method. Therefore, to carry out suppression of the air wave research is of great significance to the practical application of the oceanic controllable source electromagnetic method. In order to restrain the air wave interference, this paper proposes a synthesis source three-dimensional deconvolution interferometer that can effectively increase the receiving station distance, and obtains the relative anomaly coefficient of the earth reflection response, and analyzes the suppression ability of the method to the air wave. The simulation results are compared with the traditional methods to verify the effectiveness of the proposed method. Through the simulation analysis, this paper gives the selection method of synthetic source length, examines the seawater depth on the impact of this method, and gives relevant conclusions. The results of this study show that the earth reflection response under synthetic source conditions can effectively suppress air wave interference and significantly improve the detection ability of oceanic controlled source electromagnetic method for high resistivity hydrocarbon resources. In addition, the results of this paper will contribute to the controllable oceanic The determination of synthetic source length and receiving station distance and other parameters in the source electromagnetic system design also provides the theoretical basis for the future application of synthetic source 3D deconvolution interferometry in marine controlled source electromagnetic method.