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Verification of the carbonate double-porosity conductivity model based on digital cores

Dong Huaimin, Sun Jianmeng, Li Yafen, Cui Likai, Yan Weichao and Zhang Jinyan
Verification of the carbonate double-porosity conductivity model based on digital cores
Interpretation (Tulsa) (May 2017) 5 (2): T173-T183

Abstract

Carbonate reservoirs have complicated pore structure and reserving space, and the pore size distribution ranges are very large. Pore structure distributions represent a bimodal or trimodal state, which is also accompanied with an obviously non-Archie phenomenon. Double- and triple-porosity conductivity models based on the classification of pore dimensions were of a good coincidence with the non-Archie behavior. We have adopted digital core technology to verify the carbonate double-porosity conductivity model. Also, many rock-physical experiments and numerical simulations were performed. Through CT scanning under appropriate resolutions, macro- and micropore digital cores, which could respectively characterize the different pores, were constructed for the carbonate samples. Then the superposition method was further applied to construct the superposition digital cores, which can characterize different pores simultaneously. To quantitatively analyze and compare the effect of basic structural parameters to different digital cores, the pore network model was extracted using the Lee-Kashyap-Chu algorithm to furtherly verify the differences between scanning resolutions and pore selection characterization. In terms of qualitative validation of the double-pore conductivity model, the electrical characteristics and resistivity index (RI) under different saturations were simulated using the finite-element method and the lattice Boltzmann method. The RI curves indicated that the calculation results from the double-pore conductivity model based on a digital core are coincident with the numerical simulation results. In other words, the digital core technology can verify the double-porosity conductivity model effectively.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 5
Serial Issue: 2
Title: Verification of the carbonate double-porosity conductivity model based on digital cores
Affiliation: China University of Petroleum, School of Geosciences, Qingdao, China
Pages: T173-T183
Published: 201705
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 33
Accession Number: 2017-069989
Categories: Economic geology, geology of energy sourcesSedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Secondary Affiliation: SINOPEC, CHN, China
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 201737
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