起伏地表最小二乘傅里叶有限差分偏移方法及应用

发布时间：2018-06-25 03:02

本文选题：起伏地表 + 保幅成像　；参考：《石油物探》2016年02期

【摘要】：随着我国西部勘探开发的深入,起伏地表情形下的保幅成像逐渐成为研究热点。在线性Born近似的基础上,推导了最小二乘偏移基本公式,利用傅里叶有限差分传播算子设计了对应的偏移算子和反偏移算子,结合"逐步延拓-累加"的波场传播模式,给出了起伏地表最小二乘傅里叶有限差分偏移方法。利用加拿大逆掩断层模型对方法进行了测试,结果表明,该方法能够较好地实现地下构造成像,明显改善中深部成像的保幅性和振幅横向均衡性。将该方法应用于陆上某探区实际资料的偏移成像试处理,结果较常规偏移方法在成像精度和中深层保幅性等方面都有一定程度的改善,说明该方法对起伏地表陆上资料具有一定的实用性。
[Abstract]:With the deepening of exploration and development in the west of China, the amplitude preserving imaging under the expression shape of the volt is gradually becoming a hot spot. On the basis of the linear Born approximation, the basic formula of the least squares offset is derived. The corresponding migration operator and counter migration operator are designed by the Fu Liye finite difference propagator, and the wave field of "gradual extension accumulation" is combined. In the propagation mode, the least square Fourier finite difference migration method of the undulating surface is given. The method is tested by the Canadian overthrust fault model. The results show that the method can well realize the imaging of the underground structure and improve the amplitude preserving and the transverse equilibrium of the middle depth imaging. The method is applied to a certain land exploration. The migration imaging of the actual data in the region has been improved to a certain extent compared with the conventional migration method in the imaging precision and the medium and deep depth preserving property, which shows that the method is practical for the land surface data on the undulating surface.
【作者单位】：中国石油大学(华东)地球科学与技术学院地球物理系;
【基金】：国家重点基础研究发展计划(973计划)(2014CB239006,2011CB202402) 国家自然科学基金(41104069;41274124) 中央高校科研业务费专项基金(R1401005A) 中石化胜利物探研究院委托课题(KJWX-2014-05)项目联合资助~~
【分类号】：P631.44

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