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地震反演和储层建模是储层横向预测的两种方法。地质统计学地震反演是一种基于模型的地震反演,采用地质统计学空间插值技术建立模型,将测井曲线或测井解释成果曲线转换为“假阻抗”来合成地震记录,寻找子波,再将地震道直接反演成储层属性。这种方法避免了波阻抗转换为储层属性所造成的误差。储层建模横向预测中,应用协克里金算法联合地震反演与原始测井两种数据,综合建立地质模型。在孤家子-后五家户气田实际应用中,选取具有代表性的R2.5梯度曲线进行反演,反演结果反映了砂体分布。结合各井点测井解释数据,进行了储层建模,提高了横向预测精度。
Seismic inversion and reservoir modeling are two methods of reservoir lateral prediction. Geostatistics Earthquake inversion is a model-based seismic inversion that uses geostatistical spatial interpolation techniques to build models that convert logging or logging interpretation results to “false impedances” to synthesize seismograms and look for wavelets The seismic trace is then directly inverted into reservoir properties. This method avoids the error caused by the conversion of wave impedance into reservoir properties. In the lateral prediction of reservoir modeling, the co-kriging algorithm is combined with the two data of seismic inversion and original logging to synthetically establish the geological model. In the practical application of Gejiu-Houjiahu gas field, a representative R2.5 gradient curve is selected for inversion, and the inversion result reflects the distribution of sand body. Combined with well logging interpretation data of each well point, reservoir modeling was done to improve the accuracy of lateral prediction.