Journal
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
Volume 27, Issue -, Pages 496-503Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jngse.2015.08.017
Keywords
Shale; Digital core; Multiple-point statistics (MPS) method; Markov chain Monte Carlo (MCMC) method; Superposition algorithm
Categories
Funding
- National Natural Science Foundation of China [51304232, 51490654, 51234007]
- National Basic Research Program of China [2014CB239103]
- Ministry of Education of China [311009]
- Specialized Research Fund for the Doctoral Program of Higher Education [20120133120017]
- Fundamental Research Funds for the Central Universities [14CX05026A, 14CX06090A]
- Introducing Talents of Discipline to Universities [B08028]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1294]
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A shale matrix is too tight to be described using conventional methods, and digital core technology is becoming an alternative method. Because both organic and inorganic pores exist in the shale matrix, a digital core and a pore network model that could describe these two types of pores at the same time are constructed in this paper. Firstly, the inorganic pore digital core is constructed based on the multiple-point statistics method, and the organic pore digital core is constructed based on the Markov chain Monte Carlo method. The two types of digital cores are superposed together according to a superposition algorithm, which includes information about the shale organic and inorganic pores. The pore network models of different constructed digital cores are extracted using the pore space medial axis method. Finally, based on these platforms, the geometry and topology structure properties, the pore size distribution and the coordination number of a shale sample are analyzed. The results show that the pore size distribution of the shale sample generally ranges from 2 nm to 100 nm, mainly distributing from 5 nm to 20 nm. The coordination number is almost always in the range of 2-3. The digital core results match well with the experimental results to some extent for our study case. (C) 2015 Elsevier B.V. All rights reserved.
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