叠前弹性参数反演在浅层气藏识别中的应用

APPLICATION OF PRESTACK ELASTIC PARAMETER INVERSION IN THE IDENTIFICATION OF SHALLOW GAS RESERVOIR

针对浅层开展的叠前时间偏移处理为叠前反演提供了高质量的CRP道集资料。通过样品测试及测井曲线的标准化处理开展了横波预测和测井岩石物理分析，建立了气层识别的岩石物理图版，优选出对气层敏感的弹性参数。通过弹性参数反演出弹性参数数据体，以岩石物理图版为标准进行弹性参数交会分析得到的气层预测成果符合率超过80％。对比反演结果认为，弹性参数反演的纵向分辨率高，有利于薄互层气藏的识别。

The process of prestack time migration for shallow layer provides high-quality CRP gather data. Through the standardized process of sample tests and well logs, the shear wave prediction and petrophysical analyses of well logging are caught out, the petrophysical chart board to identify gas layer has been established, and finally the elas- tic parameters which are sensitive to the gas layer have been optimized. With the help of the above parameters, the data volume of the elastic parameters is inverted. The coincidence ratio of the obtained prediction results for gas layer is more than 80% by means of the cross and analyses of the elastic parameters taking petrophysical chart board as standard. The results of the correlation and inversion show that the vertical resolution of elastic parameter inversion is beneficial to the identification of thin interbeded gas reservoir.