致密砂岩储层测井数字岩石物理研究需求、进展与挑战

The Demand,Progresses and Challenge of Numerical Petrophysical Properties Research with Log Data in Tight Sand Reservoir

致密砂岩等非常规储层孔隙空间复杂,常规驱替等实验手段不能满足其岩石物理研究精度和时效性要求,亟需大力发展测井数字岩石物理分析技术。在分析测井数字岩石物理研究技术发展历史的基础上介绍了近年来在配套设备、模拟方法等方面取得的进展。结合致密砂岩储层特征讨论了该技术现阶段面临的4个主要问题和挑战:①分辨率与储层非均质性之间存在矛盾严重影响模拟精度;②图像分割与构建数字孔隙格架过程的多解性强;③缺乏能够模拟黏土矿物影响的方法模型;④现有模拟方法的时效性亟需优化完善。指出了该技术近期需重点攻关的2个方向为多分辨率三维孔隙网络整合和趋势云分析技术。

The unconventional oil ＆ gas resource, as tight sand reservoir, has more complex pore-structure. The frequently-used displacement experiment is inadequate in the accuracy and efficiency for the test of this kind of samples, and the numerical petrophysical properties research with log data is urgently needed. With historical review of numerical petrophysical technology, this paper gives detailed introduction on its recent development in associated equipment and numerical simulation methods. Based on tight sand reservoir characteristics, this paper discusses four challenges of this technology at the present stage. ① The contradiction between resolution and reservoir anisotropy influences simulation precision seriously; ② The image segmentation and numerical pore frame build process exists strong multiple solutions; ③ We do not have numerical models which could simulate influence of clay minerals; ④ The effectiveness of present simulation method needs to be optimized and completed. And the author suggests two key research directions of the numerical petrophysical technologies with log data in the near future： 3D pore network integration with multi-resolution and tendency cloud analysis technology.