子波反褶积在塔河油田地震解释中的应用

在塔河油田联片地震资料解释过程中,地震子波非零相位化造成的“伴随相位”假象很容易被当成有效反射加以解释。因此须对声波和密度测井资料进行环境校正,较准确地提取波阻抗反射系数,进而通过合成地震记录与井旁地震道的对比,从地震道中提取非零相位的实际地震子波,并对原地震体进行子波反褶积处理。处理后的地震体基本上消除了地震子波非零相位化引起的假象,地质反射特征清晰,分辨率明显提高。塔河油田下奥陶统顶面在未进行处理前,存在多个副相位,极易解释为不整合和砂岩透镜体,但处理后,喀斯特地貌清晰可见。

APPLICATION OF WAVELET DECONVOLUTION TO SEISMIC INTERPRETATION IN TAHE OILFIELD

During the processing of seismic data interpretation of Tahe Oilfield,pseudomorphism of adjoint phase caused by non zero phase wavelet was easily interpreted as effective reflection.It was necessary to extract impedance reflectivity based on environmental correction of sonic and density data, to extract actual non zero phase wavelet from seismic trace by comparing synthetic seismographic record with seismic trace near wells, and process seismic data with wavelet deconvolution. The processed seismic data had clear reflection character, high resolution and eliminated the pseudomorphism caused by non zero phase wavelet. The variance of coherency on the basis of processed seismic data showed clearly the characteristics of karst phenomenon on the top of Ordovician.