CRP道集优化处理对叠前反演的影响

Effects analysis of CRP gather optimal processing on prestack inversion

叠前反演已在岩性预测和流体检测中广泛应用,其预测精度除了受反演方法本身影响外,还受到输入数据的影响。作为叠前反演的输入数据,CRP道集的质量对反演结果有很大的影响。文章从塔木察格盆地塔南地区叠前反演效果出发,提出面向叠前反演的CRP道集优化处理技术及基于正演AVO特征的CRP道集质量控制方法,并从子波、信噪比、反演残差等方面分析了道集优化处理对反演效果的影响。CRP道集优化处理显著提高了CRP道集质量,其处理数据成功应用于塔木察格盆地塔南地区叠前AVA同步反演,取得了很好的预测效果。

Elastic parameter inversion from prestack seismic amplitude data has an extensive application in the lithology and hydrocarbon prediction.Inversion algorithms as well as the quality of input data often exhibit direct impacts on its accuracy.As the basic data of prestack seismic inversion,the quality of CRP gather data has huge effects on inversion results.Based on the purpose of enhancing inversion accuracy,the key technologies of CRP gather data conditioning are presented.The value of this data conditioning method is verified by matching optimized CRP data with AVO response of well log,meanwhile,the improvement of inversion results are well demonstrated by analyzing from aspects of wavelets,S / N and residual error.Expectedly,and a desirable inversion result have been achieved,after this set of CRP data was successfully applied in prestack AVA simultaneous inversion in Tannan area of Tamuchage basin.