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Mechanical-Chemical-Mineralogical Controls on Permeability Evolution of Shale Fractures
Joint Authors
Lu, Yiyu
Jia, Yunzhong
Tang, Jiren
Fang, Yi
Xia, Binwei
Ge, Zhaolong
Source
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-18, 18 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-09-10
Country of Publication
Egypt
No. of Pages
18
Main Subjects
Abstract EN
We report experimental observations of permeation of CO2-rich aqueous fluids of varied acidic potential (pH) on three different shales to investigate mechanical, chemical, and mineralogical effects on fracture permeability evolution.
Surface profilometry and SEM-EDS (scanning electron microscopy with energy-dispersive X-ray spectroscopy) methods are employed to quantify the evolution in both roughness on and chemical constituents within the fracture surface.
Results indicate that, after 12 hours of fluid flow, fracture effective hydraulic apertures evolve distinctly under different combinations of shale mineralogy, effective stress, and fluid acidity.
The evolution of roughness and transformation of chemical elements on the fracture surface are in accordance with the evolution of permeability.
The experimental observations imply that (1) CO2-rich aqueous fluids have significant impact on the evolution of fracture permeability and may influence (and increase) shale gas production; (2) shale mineralogy, especially calcite mineral, decides the chemical reaction and permeability increasing when CO2-rich aqueous fluids flow through fractures by free-face dissolution effect; (3) clay mineral swelling reduces fracture aperture and additively calcite pressure solution removes the bridging asperities, which are the main reasons for fracture permeability decrease; (4) competition roles among clay mineral swelling, mineral pressure solution, and free-face dissolution determine how fracture permeability changes.
Furthermore, a multiple parameter model is built to analyze effective hydraulic aperture evolution in considering above three mechanisms, which provide a reference to forecast fracture permeability evolution in shale formations.
American Psychological Association (APA)
Jia, Yunzhong& Lu, Yiyu& Tang, Jiren& Fang, Yi& Xia, Binwei& Ge, Zhaolong. 2018. Mechanical-Chemical-Mineralogical Controls on Permeability Evolution of Shale Fractures. Geofluids،Vol. 2018, no. 2018, pp.1-18.
https://search.emarefa.net/detail/BIM-1158504
Modern Language Association (MLA)
Jia, Yunzhong…[et al.]. Mechanical-Chemical-Mineralogical Controls on Permeability Evolution of Shale Fractures. Geofluids No. 2018 (2018), pp.1-18.
https://search.emarefa.net/detail/BIM-1158504
American Medical Association (AMA)
Jia, Yunzhong& Lu, Yiyu& Tang, Jiren& Fang, Yi& Xia, Binwei& Ge, Zhaolong. Mechanical-Chemical-Mineralogical Controls on Permeability Evolution of Shale Fractures. Geofluids. 2018. Vol. 2018, no. 2018, pp.1-18.
https://search.emarefa.net/detail/BIM-1158504
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1158504