• 地球物理学进展 , 2013,Vol.28(6)
  • 三维数字岩心建模方法综述
  • 刘学锋1    张伟伟2    孙建孟1   
  • 1. 中国石油大学(华东)理学院, 青岛 266580;
    2. 山东省高校新能源物理与材料科学重点实验室(中国石油大学), 青岛 266580;
    3. 中国石油大学(华东)地球科学与技术学院, 青岛 266580
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摘要:

三维数字岩心在孔隙尺度上描述了岩石的微观结构,已经成为定量分析岩石孔隙结构和岩石物理数值模拟的基础.本文介绍了构建三维数字岩心的两种常用方法:X射线层析扫描成像(CT)和基于岩石二维图像的重建算法,并分析了其优缺点和适用范围.以砂岩为例,定量比较了X射线CT、顺序指示模拟(SIS)、多点地质统计学(MPS)和过程法构建的三维数字岩心.结果表明:过程法重建的三维数字岩心的孔隙连通性与真实岩心最接近,而随机法重建的三维数字岩心孔隙连通性较差.结合复杂储层的岩石物理数值模拟,对三维数字岩心建模技术的发展方向做了展望,认为多尺度、多组分和纳米级三维数字岩心将在岩石物理数值模拟中发挥重要作用.

关键词: 重建算法   三维数字岩心   X射线层析扫描   数值模拟  

基金:

国家自然科学基金项目(41204084)、山东省自然科学基金(ZR2012DQ007)和中央高校基本科研业务费专项资金(12CX04084A)联合资助.

 

 

Methods of constructing 3-D digital cores: A review

LIU Xue-feng   ZHANG Wei-wei   SUN Jian-meng  

1. College of Science, China University of Petroleum, Qingdao 266580, China;   2. Key Laboratory of New Energy Physics & Materials Science in Universities of Shandong (China University of Petroleum), Qingdao 266580, China;   3. College of Geoscience, China University of Petroleum, Qingdao 266580, China  

Abstract:

3-D digital core describes the microstructure of rocks in pore scale, which has been the basis of numerical simulation of rock physics and pore structure analysis. A 3-D digital core can be obtained by X ray computed tomography (CT) or reconstruction algorithm based on 2-D images. The two kinds of methods are introduced detailed. Their advantages, disadvantages, and application scope are discussed. The 3-D digital cores constructed by X-ray CT, Sequential Indicator Simulation (SIS), Multi-point Statistics(MPS) and Process-based methods are compared quantitatively taking sandstone for example. The results show that Process-based method gives a good representation of connectivity of rock while the digital cores obtained by stochastic methods have poor connectivity of pore space. The trend of building 3-D digital cores is pointed out combining numerical simulation of rock physics for complex reservoir. The multi-scale, multi-component, and nano-scale digital cores will play an active role in the study of rock physics of complex reservoir.

Keywords: Reconstruction algorithm   Numerical simulation   X-ray computed tomography   3-D digital core