Microscopic Pore Structure of Surrounding Rock for Underground Strategic Petroleum Reserve (SPR) Caverns in Bedded Rock Salt

Nan Zhang, Wei Liu, Yun Zhang, Pengfei Shan and Xilin Shi
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Nan Zhang: Key Laboratory of Western Mines and Hazard Prevention, Ministry of Education of China, School of Energy Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Wei Liu: State Key Laboratory of Coal Mine Disaster and Control, Chongqing University, Chongqing 400044, China
Yun Zhang: Key Laboratory of Western Mines and Hazard Prevention, Ministry of Education of China, School of Energy Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Pengfei Shan: Key Laboratory of Western Mines and Hazard Prevention, Ministry of Education of China, School of Energy Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Xilin Shi: State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China

Energies, 2020, vol. 13, issue 7, 1-22

Abstract: Using salt caverns for an underground strategic petroleum reserve (SPR) is considered as an ideal approach due to the excellent characteristics of low porosity, low permeability, self-healing of damage, and strong plastic deformation ability of rock salt. Salt deposits in China are mostly layered rock salt structures, with the characteristics of many interlayers, bringing great challenges for the construction of SPR facilities. Studying the microscopic pore characteristics of the rock surrounding SPR salt caverns in different environments (with brine and crude oil erosion) is necessary because the essence of mechanical and permeability characteristics is the macroscopic embodiment of the microscopic pore structure. In this paper, XRD tests and SEM tests are carried out to determine the physical properties of storage media and surrounding rock. Gas adsorption tests and mercury intrusion tests are carried out to analyze the microscopic pore structure, specific surface area variation and total aperture distribution characteristics of SPR salt cavern host rock. Results show that: (1) Large numbers of cores in interlayer and caprock may provide favorable channels for the leakage of high-pressure crude oil and brine. (2) The blockage of pores by macromolecular organic matter (colloid and asphaltene) in crude oil will not significantly change the structural characteristics of the rock skeleton, which is beneficial to the long-term operation of the SPR salt cavern. (3) The water–rock interaction will bring obvious changes in the micro-pore structure of rock and increase the leakage risk of the storage medium. The results can provide theoretical bases and methods for the tightness analysis of China’s first underground SPR salt cavern.

Keywords: strategic petroleum reserve (SPR); bedded rock salt; salt cavern; pore characteristic; gas adsorption (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (7)

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