碳酸盐岩双孔隙数字岩心结构特征分析-中国石油大学学报.pdfVIP

2013年摇 第37卷摇 摇 摇 摇 摇 摇 中国石油大学学报(自然科学版)摇 摇 摇 摇 摇 摇 摇 摇 Vol.37摇 No.2 摇 第2期摇 摇 摇 摇 摇 摇 摇 摇 Journal of China University of Petroleum摇 摇 摇 摇 摇 摇 摇 摇 Apr.2013 摇 摇 文章编号:1673鄄5005(2013)02鄄0071鄄04摇 摇 摇 doi:10.3969/ j.issn.1673鄄5005.2013.02.012 碳酸盐岩双孔隙数字岩心结构特征分析 王晨晨,姚摇 军,杨永飞,王摇 鑫,汲广胜,高摇 莹 (中国石油大学石油工程学院,山东青岛266580) 摘要:基于扫描电子显微镜(SEM),分别获取用来描述碳酸盐岩大孔隙和微孔隙特征的低分辨率岩心薄片和高分辨 率岩心薄片,利用马尔可夫链蒙特卡洛方法构建相应的大孔隙数字岩心和微孔隙数字岩心,并通过叠加法构建出同 时描述大孔隙和微孔隙性质的碳酸盐岩双孔隙数字岩心,最后对数字岩心的孔隙结构特征进行分析评价。 结果表 明:马尔可夫链蒙特卡洛法能够基于真实岩心薄片快速构建出三维数字岩心;叠加法构建的碳酸盐岩双孔隙数字岩 心的孔隙连通体积比明显提高,微孔隙的叠加对提高整个碳酸盐岩双孔隙数字岩心的连通性有着重要影响;碳酸盐 岩双孔隙数字岩心孔隙尺寸分布大体上遵从双峰分布,能够同时描述大孔隙和微孔隙特征。 关键词:碳酸盐岩;马尔可夫链蒙特卡洛法;叠加法;双孔隙数字岩心;孔隙结构特征 中图分类号:TE312摇 摇 摇 文献标志码:A Structure characteristics analysis of carbonate dual pore digital rock WANG Chen鄄chen,YAOJun,YANG Yong鄄fei,WANG Xin,JI Guang鄄sheng,GAO Ying (School of Petroleum Engineering in China University of Petroleum,Qingdao266580,China) Abstract:Based on scanning鄄electron microscopy,the lower resolution imageswere collectedto show macro pore properties while the high resolution images were collected to show micro pore properties,and Markov chain Monte Carlo (MCMC) methodwas used to construct the corresponding macro pore and micro pore digital rock respectively. Then superposition methodwas used to construct carbonate dual pore digital rock. Finally,pore structures of digital rockswere compared. The results show that MCMC methodcouldreconstructthe3Ddigitalrockquickly. Thecarbonatedualporedigitalrockconstruc鄄 ted by superpositionmethodhasahigherpercolatingvolumefraction,whichshowsthatmicroporehasanimportantinfluence on the total connectivity. The carbonate digital rock constructedby superposition methodhasabimodal pore size distribution which could describe the macro pore and micro pore characteristics simultaneously.