基于互相关的仿真算法(CCSIM)的页岩数字岩心重构

Shale Digital Core Reconstruction Based on CCSIM Method

页岩储层具有低孔、低渗,矿物组分复杂及各向异性突出等特点,其基础的岩石物理研究实验很难进行,而数字岩心模型可为页岩的岩石物理实验数值模拟奠定基础。针对页岩储层的特殊性质,利用二维扫描电镜图像,选用基于互相关的仿真算法(CCSIM),实现了岩石数字岩心模型的重构。该方法计算效率较高,重构结果与原始二维切片形态具有良好的一致性,再现了页岩组分的长距离连通性,验证了CCSIM用于下一步页岩多尺度三维模型构建的可行性。

The shale reservoirs had the characteristics of low porosity and low permeability,complex mineral components and prominent anisotropy.Therefore,it was difficult to carry out the experiment of basic shale rock physics research.The digital core model could lay a foundation for the numerical simulation of shale rock physics experiment.According to the special properties of shale reservoirs,a two-dimensional scanning electron microscope image was used.New images were reconstructed by using the cross-correlation-based simulation (CCSIM).The method was efficient for calculation,and the reconstruction results were consistent with the shapes of original 2D slices.The long-distance connectivity of shale components is reproduced,and the feasibility of using CCSIM constructing a multi-scale three-dimensional model of shale in the next step is verified.