一种基于井控的反射PP波和反射PS波振幅匹配方法

摘要

针对PP波与PS波传播方式不同,资料处理因素不同造成两者叠后地震剖面不能保持振幅相对强弱关系的问题,这里提出了一种基于井控的单层反射PP波和反射PS波的振幅匹配方法.该方法利用目的层附近标准层PP波和PS波合成地震记录上理论振幅关系,校正实际地震剖面上两者的振幅相对关系,能有效恢复PS波地震振幅.将该方法应用于四川盆地川中某地区三维三分量资料的振幅恢复,利用须三底界PP波和PS波理论振幅关系校正实际地震剖面两者振幅关系,有效恢复了PS波地震数据振幅,并利用振幅匹配后多波数据,采用最大波峰振幅比信息实现了储层的定量预测:PP波、PS波振幅比值大于2为含气有利区,后续6口开发井5口井与钻井吻合,振幅比符合率达83.3%.该振幅匹配方法具备一定的计算精度,能有效恢复PP波与PS波地震数据振幅相对关系,最终实现振幅信息的定量含气预测.%On the issues of the unmatched post-stack PP and PS wave amplitude because of the differences of the PP and PS wave propagation type and the data processing factors, this study provides a technique to calibrate and match the PP and PS amplitude based on the well-controlled reflected PP and PS wave, which synthesized by the standard layer. This method has successfully used in the amplitude recovery of the 3D3C data in Penglai area, Sichuan basin, basing on the theoretical PP and PS amplitude relationship to calibrate the actual PS amplitude and effectively recover the amplitude of PS seismic data. Moreover, the method contributes to the amplitude quantitative prediction by the ratio of the maximum wave peak of the PP and PS, which the PP to PS ratio more than 2 represents the favorable gas bearing areas and it attain to the prediction success ratio about 83.3%. In addition, this amplitude matching method has a higher calculation precision to effectively recover the PP and PS amplitude relationship and gets to goal of the quantitative gas prediction by amplitude information.