基于特征曲线构建的地质统计反演在薄砂体预测中的应用

The application of geostatistical inversion based on characteristic curve structuring technology to thin sand body reservoir prediction

为了解决扇三角洲前缘薄砂体预测分辨率不高的问题,文中针对舍女寺油田女59断块的基本地质特点,利用约束稀疏脉冲反演和基于特征曲线构建的地质统计反演两种方法,对该区孔二段1砂组的砂体进行了预测,对计算结果的地质效果有效性进行了评价,根据不同井网密度及不同地下地质条件选择相适应的反演结果。与常规方法相比,采用基于特征曲线构建的地质统计反演适用于井密集开发区单砂体的预测。在井稀少的探区,约束稀疏脉冲反演方法更适合砂层组的预测。该项技术有效地指导了女59井区孔二段1砂组油砂体的开发工作。

In order to solve the problem of low prediction resolution for fan delta front thin sand body,the authors,considering basic geological characteristics of Nv59 fault-block in the Shenusi oilfield,utilized the advantages and disadvantages of the constrained sparse spike inversion and geostatistics inversion method,predicted sand body of Ek21 of this block,and evaluated the effectiveness of the geological effect of the calculated result. According to different well densities and different underground geological conditions,the authors chose adaptive inversion result.Compared with conventional methods,geostatistics inversion based on characteristic curve structuring is more suitable for single body prediction in development areas with dense wells. In areas where the wells are scarce,constrained sparse spike inversion is more suitable for prediction of thick sand group.This technique has guided the development of Ek21 oil sands at Nv59 fault block effectively.