基于测井约束的地震全波形反演方法

发布时间：2018-04-28 00:47

本文选题：全波形反演 + 低频信息　；参考：《石油地球物理勘探》2017年06期

【摘要】：在实际应用中全波形反演依赖于初始速度模型与低频信息,若初始模型精确度低常会引起周波跳跃现象。测井资料具有垂向分辨率高的特点,含有丰富的超低频与高频成分,测井信息的引入可以在一定程度上弥补地震频带缺失、反射数据精度低、信噪比低的不足,故从两个方面将先验信息引入全波形反演。一是充分利用可靠的测井数据低频信息建立较精确的初始速度模型,以弥补地震数据缺少低频信息的问题;二是在全波形反演目标泛函中引入先验模型约束项,利用测井数据约束反演过程,驱使反演沿给定的方向进行,以提高反演过程的稳定性,从而获得较高精度的速度模型。通过EAGE推覆体模型对所提方法进行试算,相对不加约束全波形反演结果得到改善;实际地震资料应用结果表明,使用测井约束的反演结果能更清楚地展示砂岩层,具有较高的分辨率,反演效果更好。
[Abstract]:In practical application, the full waveform inversion depends on the initial velocity model and the low frequency information. If the accuracy of the initial model is low, it will cause Zhou Bo jump phenomenon. The logging data have the characteristics of high vertical resolution and rich ultra-low frequency and high frequency components. The introduction of logging information can make up for the lack of seismic frequency band, the low accuracy of reflection data and the low signal-to-noise ratio to some extent. Therefore, priori information is introduced into full waveform inversion from two aspects. One is to make full use of the reliable low-frequency information of logging data to establish a more accurate initial velocity model to make up for the lack of low-frequency information in seismic data, the other is to introduce a priori model constraint term into the target functional of full-waveform inversion. In order to improve the stability of the inversion process and obtain a high accuracy velocity model, the inversion is driven along a given direction by using logging data to constrain the inversion process. The EAGE nappe model is used to test the method, and the result of unconstrained full waveform inversion is improved, and the application results of the actual seismic data show that the inversion results with logging constraints can show the sandstone formation more clearly. It has higher resolution and better inversion effect.
【作者单位】：中国石油大学(华东)地球科学与技术学院;海洋国家实验室海洋矿产资源评价与探测技术功能实验室;中国石化胜利油田物探研究院;
【基金】：国家重大科技专项(2016ZX05024-001-008)资助
【分类号】：P631.4

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