Journal Published Online: 02 October 2020
Volume 9, Issue 1

Comprehensive Brittleness Evaluation on Cap Rock of X9 Gas Storage Using an Improved Geometric Polygon Method

CODEN: ACEMF9

Abstract

Brittleness is an important mechanical characteristic of rock and is critical to shale reservoir, which is characterized with low porosity and low permeability. Brittleness evaluation of cap rock plays an important role in the site selection, operation, and maintenance of underground gas storage. However, it is still a difficult problem for conducting a quantitative brittleness evaluation. In this article, the brittleness of X9’s cap rock has been evaluated by the five available effective methods that are based on mineral composition, elastic parameters, stress-strain curve, analytic hierarchy process, and fuzzy analytical hierarchy process, respectively, and the results of them are general, weak, weak, general, and general, respectively. Combined with the five evaluation results, a comprehensive brittleness evaluation based on geometric regular polygon method is proposed. The results show that the brittleness of X9’s cap rock is faint. Because of the comprehensive consideration of the limitations of existing brittleness evaluation methods, the excessive idealization of conventional regular polygon method, and the irrationality of division in evaluation grades, this method is improved based on the conventional regular polygon method and has advantages of comprehensive utility, strong feasibility, reliable result, and wide application range and can be used to evaluate similar targets.

Author Information

Wen, Caoxuan
School of Urban Construction, Yangtze University, Jingzhou, Hubei, China
Jia, Shanpo
Institute of Unconventional Oil and Gas, Northeast Petroleum University, Daqing, Heilongjiang, China
Shu, Ketong
State Grid Hubei Electric Power Co., Ltd., Xianning Power Supply Company, Xianning, Hubei, China
Liu, Tuanhui
Exploration and Development Research Institute of Huabei Oilfield Company, China Natinal Petroleum Corporation, Renqiu, Hebei, China
Pages: 15
Price: $25.00
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Details
Stock #: ACEM20190138
ISSN: 2379-1357
DOI: 10.1520/ACEM20190138