多点地质统计反演技术

Study on multi-point geological statistical inversion technology

在开发中后期,传统的基于两点统计的地震储层反演方法可提高碎屑岩储层纵向表征分辨率,获得高分辨率的反演结果。然而在储层形态上,两点统计反演难以刻画储层复杂形态及结构特征。多点地质统计反演则能够通过多个空间点联合分布刻画特定地质体形态,同时保证垂向高分辨率特征。给出了一种基于多点地质统计学的储层反演方法和流程,首先通过多点地质统计建模确定岩相分布,然后通过岩相与弹性属性的先验分布抽样获得岩相模型控制下的弹性参数场分布,最后通过合成地震记录与理论地震记录匹配决定最优岩相和弹性参数场,实现多点地质统计地震反演。理论模型对比研究表明:相对于传统的两点统计反演和稀疏脉冲反演,多点地质统计地震反演结果精度高,具有推广应用价值。

Traditional seismic reservoir inversion method based on two-point statistics can obtain high resolution inversion results.However,the two-point statistics can′t describe the geological information with complex structure.In this paper,a multi-point geostatistical inversion method is proposed.Firstly,the lithofacies distribution is determined by multi-point geostatistical modeling,and then the elastic parameter field distribution under the control of lithofacies model is obtained by sampling the prior distribution of lithofacies and elastic attributes.Finally,the optimal lithofacies and elastic parameter field are determined by matching synthetic seismic records with theoretical seismic records to realize multi-point geostatistical seismic inversion.The comparative study of theoretical models shows that the results of multi-point geostatistical seismic inversion are of high accuracy,and have the value of popularization and application.