一种预测天然气饱和度的新方法

摘要

A NI inversion method of linear rock physical properties transformation was introduced in previous studies, which can be used to predict gas saturation on the basis of prestack seismic data.The problem as to how to make the sensitivity analysis of the inver⁃sion results in order to correctly predict commercial gas reservoirs was discussed. By increasing the rock physical properties transform precision and strengthening the constraint of pore fluid transformation the authors further improved the inversion algorithm,which raises the accuracy of inversion effectively.The practical application results show that the quadratic equation NI inversion method can effective⁃ly predict the gas saturation in complex area.%先前[1]介绍了一种基于叠前地震资料预测天然气饱和度的线性岩石物理属性变换的NI反演方法，并对反演结果进行敏感性分析进而有效预测有商业开采价值的天然气藏。在此基础上通过提高岩石物理属性变换的精度和加强孔隙流体变换约束进一步改进反演算法，有效提高了NI反演的精度。实际应用结果表明，二次方程NI反演方法有效提高了复杂地区天然气饱和度的预测效果。