叠前同步反演在M地区储层预测中的应用

Application research of the reservoir prediction in M region on using prestack synchronous inversion

经前人研究结果表明,珠江口盆地M地区常规叠后波阻抗较难识别储层和反映储层物性。使用叠前同步反演方法,即利用叠前CRP道集和测井信息,采用Fatti方程的改进形式进行反演,可同时获得纵波阻抗、横波阻抗、密度等弹性参数。结果表明,密度属性能很好地区分储层,反映储层物性,目的层灰岩和砂岩储层的沿层密度属性很好地反映了储层横向变化规律。实钻结果表明,预测结果与井实测结果吻合度较高,表明利用叠前同步反演技术进行珠江口盆地M地区储层预测是可行的。

The previous research results showed that it was difficult to identify reservoir and to indicate reservoir porosity property by using routine post-stack impedance in M region of Zhuj iangkou basin.Using prestack synchronous inversion tech-nology,by using prestack CRP gathers and logging data by the improvement form of Fatti equation,could obtain impedance, shear impedance,density data and so on at the same time.The results show that the density attribute could clearly distinguish reservoir,and indicate reservoir porosity property,the density attribute along the goal layers of limestone and sandstone reser-voir could clearly indicate the reservoir lateral chang law.The drilling results showed that the coincide was high between the prediction results and the actual measurement results,so it was feasible to predict reservoir by using prestack synchronous in-version technology in M region of Zhuj iangkou basin.