3D digital core modeling of shale gas reservoir rocks:A case study of conductivity model

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  • 1.Key Laboratory of Exploration Technologies for Oil and Gas Resources(Yangtze University),Wuhan 430100,China;
    2.Hubei Cooperative Innovatio Center of Unconventional Oil and Gas,Wuhan 430100,China;
    3.Key Laboratory of Geo-detection(China University of Geosciences,Beijing),Ministry of Education,Beijing 100083,China;
    4.Petroleum Exploration and Development Research Institute,SINOPEC,Beijing 100083,China

Received date: 2015-07-05

  Revised date: 2015-08-30

  Online published: 2019-09-20

Abstract

Due to the properties of low porosity,low permeability,prominent anisotropy and complex mineral composition,the basic research of shale reservoir rock,and the physical experiments cannot be carried out smoothly.The 3D digital core modeling is the foundation for the numerical simulation which could be the replacement of the experimental methods to study the rock's physical properties.However,the conventional modeling methods are not applicable to help rebuilding the digital core model of complex rock of shale gas reservoirs.In this paper,the 2D SEM and EDS images of shale gas reservoir rock were used to obtain the distribution characteristics of each composition.The components such as pore,clay,pyrite and organic matters which are needed in electrical conductivity simulation were selected.After choosing the appropriate scale(40μm3) which can reveal the macroscopic features of rocks,the Markov Chain-Monte Carlo(MCMC) method was chosen and improved to build the original 3D model of each micro components respectively.Then the models were nested into each other to form the final micron grade 3D model which contains several components and the characteristics of the original structure.The final model was evaluated and the results showed that the digital core model could be used for conductivity numerical simulation of shale gas reservoir.Using this method,models for the simulation of other physical properties could also be built.The disadvantages of this method were discussed and the suggestions to improve the modeling were given.

Cite this article

Nie Xin, Zou Chang-chun, Meng Xiao-hong, Jia Shuang, Wan Yu . 3D digital core modeling of shale gas reservoir rocks:A case study of conductivity model[J]. Natural Gas Geoscience, 2016 , 27(4) : 706 -715 . DOI: 10.11764/j.issn.1672-1926.2016.04.0706

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