基于叠前同步反演的储层参数预测技术研究及应用

Study on reservoir parameters prediction technique based on pre-stack simultaneous inversion and its application

合理地预测油气藏孔隙度等参数的空间分布,是储量计算和地质建模等工作的基础。基于叠前同步反演技术,研究了储层参数的计算方法。在储层岩石物理特征精细分析的基础上,对测井资料进行了有针对性的优化处理;在此基础上利用叠前同步反演计算了纵波阻抗、横波阻抗、纵横波速度比等弹性参数;最后,在储层刻画的基础上,基于岩石物理分析和步聪法优选弹性参数,通过多属性拟合技术,估算了西湖凹陷A气田G1气藏的孔隙度。估算的结果与钻井吻合好,空间分布合理,取得了较好的效果。

The reasonable prediction of the spatial distribution of reservoir parameters such as porosity is the basis of the calculation of reserves and geological modeling. Based on the pre-stack simultaneous inversion, a method for calculating the reservoir parameters is studied. By analysis of the reservoir petro-physical feature, the optimized processing is performed on the log data. On this base, the elastic parameters such as the P-wave impedances, S-wave impedances and Poisson＇s ratio are calculated by prestack simultaneous inversion. And then, after the reservoir characterization, the petrophysical analysis and the step-wise method are used to select the best elastic parameters. Finally, by the multi-attributes fitting technology, the porosity of G1 gas reservoir in gas field A of Xihu sag is calculated from the inverted elastic parameters. The estimated porosity agrees with the drilling results and the space distribution is reasonable. It reaches a good result.