Characteristics of Cavity Differential Dissolution of Jintan Salt Cave Gas Reservoir

doi:10.11885/j.issn.1674-5086.2018.04.19.02

Abstract

Abstract: In China, salt mines that can be used for salt cave gas reservoir construction are mostly composed of layered salt rocks, and differential dissolution of the cavity often occurs during solution mining. Research into the characteristics and causes of such phenomenon can provide references for future construction of salt cave gas reservoirs in China. This work investigates the Jintan Salt Cave Gas Reservoir, which is the first salt cave gas reservoir in China. Based on sonar cavity data, differential dissolution in the cavity can be quantitatively analyzed using the differential dissolution coefficient, which is the ratio of the maximum cavity radius to the minimum radius in the same plane. The direction of the maximum radius is the direction of differential dissolution in the cavity. The statistical results reveal that, for the Jintan Gas Reservoir, the differential dissolution coefficient in the cavity is 1.13~11.88, and differential dissolution occurs primarily along the northeast-southwest direction. The causes of differential dissolution in the cavity are analyzed by integrating the thickness and ground stress data of interlayers and salt layers that can be used for mining. It is believed that non-uniform collapses of interlayers during solution mining can lead to differential dissolution in the cavity. Thicker salt layers that are more suitable for mining result in greater likelihood and severity of differential dissolution in the cavity. The ground stress directions significantly influence partial melting in the cavity.

Key words: salt cave gas reservoir, Jintan, cavity morphology, causes of differential dissolution, ground stress, solution mining

CLC Number:

TE122

QI Deshan, LI Shuping, WANG Yuangang. Characteristics of Cavity Differential Dissolution of Jintan Salt Cave Gas Reservoir[J]. 西南石油大学学报(自然科学版), 2019, 41(2): 75-83.

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