全直径碳酸盐岩岩心孔隙空间重构方法

Pore-space reconstruction method research for full-diameter carbonate cores

张忆南 梁利喜 刘向君 李玮

西南石油大学油气藏地质及开发工程国家重点实验室，四川 成都 610500

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China

缝洞型碳酸盐岩多具有较强的非均质性，在标准尺寸岩心栓上进行的研究难以表征真实岩心孔洞缝结构特征，需在全直径岩心上开展研究。然而，受岩心尺寸影响，三维CT扫描结果中噪声较多且微裂缝等弱结构响应不明显，现有孔隙空间重构方法不适用。针对此问题，文中首先基于高低帽变换等图像增强算法以增强裂缝响应，在此基础上建立了缝洞型碳酸盐岩全直径岩心三维CT重构方法。应用结果表明，建立的算法能够较好地重构全直径缝洞型碳酸盐岩岩心三维孔隙空间。

Many fracture-cavity carbonate rocks have strong heterogeneity. Studies on standard-sized core bolts are difficult to characterize the true core hole-slot structure characteristics, and research needs to be carried out on full-diameter cores. However, due to the influence of core size, 3D CT scan results have more noise and weak structural responses such as micro-fractures are not obvious. The existing pore space reconstruction methods are not applicable. In response to this problem, this study first enhanced the fracture response based on image enhancement algorithms such as top-bottom hat transformation, and based on this, a 3D CT reconstruction method for fracture-cavity carbonate cores with full diameter was established. The application results show that the established algorithm can well reconstruct the 3D pore space of fractured-cavity carbonate cores with full diameter.

10.6056/dkyqt202103011