Three-dimensional characterization of micro-fractures in shale reservoir rocks  

作　　者：Chao Qi Xiaoqi Wang Wei Wang Jie Liu Jincai Tuo Keyu Liu 

机构地区：[1]School of Earth Sciences and Engineering,Sun Yat-sen University,Guangdong,510275,China [2]Research Institute of Petroleum Exploration and Development,PetroChina,Beijing,100083,China [3]Guangdong Provincial Key Laboratory of Mineral Resources&Geological Processes,Guangdong,510275,China [4]Gansu Provincial Key Laboratory of Petroleum Resources/Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,Gansu,730000,China [5]School of Geosciences,China University of Petroleum(East China),Shandong,266580,China

出　　处：《Petroleum Research》2018年第3期259-268,共10页石油研究（英文）

基　　金：This work was financially supported by the National Basic Research Program of China(973 Project)"Formation mechanism and enrichment law of China's terrestrial tight oil(shale oil)"(2014CB239004).

摘　　要：Fractures are crucial for unconventional hydrocarbon exploitation,but it is difficult to accurately observe the 3D spatial distribution characteristics of fractures.Microtomography(micro-CT)technology makes it possible to observe the 3D structures of fractures at micro-scale.In this study,micron-CT scanning is conducted on multiple mud-shale samples of source rocks in the Permian Lucaogou Formation,Junggar Basin.The Avizo^(®) software is applied to process and segment the micron-CT images,so as to obtain the 3D fracture structure model inside rock core.Therefore,the independently-developed CTSTA program is adopted to quantitatively describe the micro-fractures inside rock core,including fracture dimension,extension direction and extension scale.Meanwhile,this study summarizes the classification characteristics of fractures and their anisotropy.On this basis,the fractal dimensions of fractures can also be extracted.Previous studies show that the geometric features of fractures have self-similarity at large and small scales,which can be described by exponential laws;and the fractal dimension is a typical exponent.Through the quantitative description or characterization of 3D fractures at micro-scale,the distribution characteristics of fractures in large scales could be known.

关 键 词：Tight reservoir Microtomography FRACTURE CHARACTERIZATION Fractal dimension 

分 类 号：P61[天文地球—矿床学]