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- Title
Using permeability mechanics behavior of typical carbonate to identify reservoir and caprock properties.
- Authors
Tong LIN; Tong-shan WANG; Jing-hai DONG; Yin ZENG; Zhi-de WU
- Abstract
At present, the study of carbonate rocks mainly focuses on the reservoir space of oil and gas. However, as oil and gas exploration expands into deeper and more ancient formations, effective carbonate reservoir-cap configuration becomes more critical. Exploration has proved that high porosity and permeability reservoirs are still developed in the favorable carbonate facies zones under deep burial conditions, but the development and configuration of carbonate cap has become a key factor restricting the exploration of deep carbonate rocks. In this study, the permeability evolution with temperature and confining pressure in the process of carbonate rock failure and deformation is obtained for the first time systematically and comprehensively by conducting the permeation mechanics test for the whole process of triaxial stress loading under different temperature conditions for typical carbonate rock. Experimental analysis results show that the penetration of typical dolomite and typical limestone in the process of deep stress mechanics behavior characteristics has obvious difference. Dolomite shows that, the characteristics is more towards the reservoir property, the brittle-plastic conversion critical confining pressure is larger, rock is easier to form cracks, rock permeability increases with the increase of temperature, etc. Generally, the limestone shows the properties of the cap, for example, the critical confining pressure of brittle plastic transformation is lower than that of dolomite, the rock is relatively easy to be closed, and the permeability decreases with the increase of temperature. It is concluded that the longitudinal superposition of dolomite and limestone in carbonate rocks can form an effective reservoir-cap assemblage.
- Subjects
LIMESTONE; CARBONATE reservoirs; CARBONATE rocks; STRAINS &; stresses (Mechanics); PERMEABILITY; ROCK permeability
- Publication
Natural Gas Geoscience, 2020, Vol 31, Issue 8, p1139
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2020.05.011