基于小波变换的地震相干体算法及其应用

Computation of seismic coherence cube based on wavelet transform and its application

1. 中油股份勘探开发研究院西北分院，甘肃兰州730020;2. 大港油田，天津300280

1 .Northwest Branch of PetroChina Research Institute of Petroleum Exploration and Development，Lanzhou730020. China;2. Petro China Dagang Oilfield Company. Tianjin 300280. China

基于文献[1]、文献[2]和文献[3]的相干算法,提出了利用小波域分频计算瞬时特征参数,然后计算相干体。根据研究断层特征,用分频计算相干体进行重构。马东一唐南油田上第三系浅层油田及东营组高产油田是20世纪60年代初期发现并开发的老油田,目前该区存在着种种问题:断层多,构造复杂,而且以前所钻的井并非构造有利部位。为此,采用基于小波变换的地震相干体算法以搞清断裂展布。实际资料计算表明了该方法的有效性。

A method for calculation of coherence cube is put forward in the paper based on the algorithms of coherence cube computation proposed in references[l], [2], and[3]. The method extracts instantaneous features in wavelet domain with frequency division computation, and then calculates the coherence cube. Madong-Tangnan oilfield is discovered in the early 1960's and produced since then. There are several problems to be resolved in the oilfield such as rich in faults and complex in structures. The previously drilled wells are not in the favorite positions of the structures. The proposed method was used in investigation of fault distribution. Desired results are yielded which proves the effectiveness of the method.