地震相控非线性随机反演方法在湘西北海相页岩气储层预测中的应用

Application of Seismic Nonlinear Random Inversion to Shale Gas Reservoir Prediction in Northwestern Hunan

以湘西北B-J页岩气区块为例,对工区内8口井的测井数据进行了统计分析,获得了龙马溪组页岩储层的岩石物理特征。采用地震相控非线性随机反演方法,以测井、地质信息作为约束条件,通过对叠后地震资料进行拓频等处理和反演,对B-J区块龙马溪组页岩储层进行了预测,提高了资料的纵向分辨率和横向延展性,揭示了页岩的储层展布特征。工区内新钻井的统计结果表明,预测与实钻吻合度较高,地震储层预测方法具有较高的可信度,在油气田勘探开发中具有良好的应用前景。

Taking shale gas in B-J play,northwest Hunan as an example,this paper has conducted a statistical analysis on logging data of 8 wells in this area and acquired rock characteristics of the Longmaxi shale.The seismic nonlinear random inversion method has been adopted to predict the shale gas reservoir of Longmaxi formation in B-J play,north-west of Hunan province by expanding the frequency band of post-stack seismic data taking logging and geological information as constraint conditions,which enhances the vertical resolution as well as horizontal extensibility and reveals the characteristics of shale reservoir.The prediction results of 7 wells have matched well with the actual drill situation,which shows that the seismic prediction method has high reliability and applicability in the oil and gas exploration.