海上拖缆采集地震数据接收点位移校正

发布时间：2018-05-29 11:02

本文选题：接收点位移校正 + 拖缆　；参考：《石油地球物理勘探》2017年01期

【摘要】：海上拖缆地震数据采集时,接收点位移会使成像剖面产生与采集船航向相反的偏移,越晚到达的信号越偏离实际位置。针对常规P1/90导航文件提供的时间信息只精确到1s、精度较低的问题,采用具有更高精度的P2/94导航文件的时间信息计算船速,逐条电缆校正地震数据;通过建立弧长坐标的方法,将平面上的曲线映射为弧长坐标中的直线,降低数据插值的复杂性。模型数据和实际资料的测试证明,经接收点位移校正减小了时移地震两次采集时船速不同带来的成像误差,使资料的一致性更好,有利于突出储层物性变化的地震响应,提高油气藏变化监测的精度。该方法不仅针对海上时移地震资料匹配处理有效,对常规深水地震勘探同样具有借鉴意义。
[Abstract]:During seismic data acquisition of towed cables, the displacement of the receiving point will cause the imaging profile to shift opposite to the direction of the acquisition ship, and the later the arrival signal is, the more the actual position will be. In order to solve the problem that the time information provided by the conventional P1 / 90 navigation file is only as accurate as 1 s, and the accuracy is low, the ship speed is calculated by using the time information of the P 2 / 94 navigation file with higher accuracy, the seismic data is corrected by cable, and the method of establishing arc length coordinates is adopted. The curve on the plane is mapped to a straight line in the arc length coordinate, which reduces the complexity of data interpolation. The test of model data and actual data shows that the imaging error caused by different ship velocities in two time-lapse seismic acquisition is reduced by the displacement correction of the receiving point, and the consistency of the data is better, which is beneficial to outburst the seismic response of reservoir physical property change. Improve the accuracy of oil and gas reservoir change monitoring. This method is not only effective for offshore time-lapse seismic data matching, but also useful for conventional deep-water seismic exploration.
【作者单位】：中海油研究总院;海洋石油勘探国家工程实验室;
【基金】：中海油有限公司综合研究项目“海上时移地震技术优化与应用”(YXKY-2015-ZY-03) 国家重大专项课题“中国近海中深层地震勘探关键技术”(2016ZX05024001)联合资助
【分类号】：P631.46

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