随机地震反演在苏里格气田苏x井区储层预测中的应用

Application of Stochastic Seismic Inversion to Reservoir Prediction in Su X Well Block, Sulige Gas Field

苏里格气田苏x井区盒8段为典型的低孔低渗储层,含气砂岩的波阻抗与泥岩有较大的重叠,因此单纯利用波阻抗反演进行储层预测效果并不理想,针对此难题,提出了利用随机地震反演进行储层预测的新思路。首先对研究区盒8段储层的地球物理参数进行了分析,构建了岩性及含气性指示参数;在此基础上,通过随机模拟地震反演对研究区盒8段储层的岩性及含气性进行了预测。经钻井证实,该方法能较好地对苏x井区盒8段的致密储层进行预测。

The reservoir of HE-8 Member in Su X well block is typical of low porosity and permeability. The seismic impedance of gas sandstone is greatly overlapped with that of mudstone, therefore the method of reservoir predicting with seismic impedance inversion is not accurate. For the problem above, the method of reservoir predicting with stochastic seismic inversion is proposed in this paper. Geophysical parameters of HE-8 Member are firstly analyzed, in addition lithological and gassy parameters are predicted. On the basis above, lithological and gassy distribution is predicted by means ofstochastic seismic inversion. Verified by drilling￡?tight reservoir of HE-8 Member in Su X well block is predicted well by this method.