Geochemical mechanisms of water/CO2-rock interactions in EGS and its impacts on reservoir properties: A review

Gao, Binbin; Li, Yiman; Pang, Zhonghe; Huang, Tianming; Kong, Yanlong; Li, Bin; Zhang, Fen

doi:10.1016/j.geothermics.2024.102923

Cited by 6 publications

(1 citation statement)

References 159 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(ii) Illite and chlorite reacted with hydrogen ions under acidic conditions to produce substances containing quartz (eqs and ), which simultaneously increased the quartz content. (iii) Albite and K-feldspar can be converted to quartz in an acidic environment, which also increases the content of quartz in shale (eqs and ). , Similarly, the rise in pyrite proportion was correlated with the decline in the proportion of other minerals and may also be due to the increase of hydrogen ions to promote the precipitation of pyrite (eq ).…”

Section: Results and Discussionmentioning

confidence: 99%

SC-CO₂ and Brine Exposure Altering the Mineralogy, Microstructure, and Micro- and Macromechanical Properties of Shale

Huang,

Liu,

Kang

et al. 2024

Energy Fuels

View full text Add to dashboard Cite

Understanding the mechanism of the fluid−shale interaction, which is induced by SC-CO 2 injection, is critical to the safety of shale oil exploitation and the geological sequestration of CO 2 . In this paper, the effects of different soaking fluids (SC-CO 2 , brine, and SC-CO 2 + brine) and soaking time (7, 14, 21, and 28 days) on the physical properties of shale were investigated by performing static soaking experiments. A series of experimental methods (XRD, SEM, Nanoindentation, UCT, and Brazilian splitting) were used to analyze the variation of shale physical properties before and after soaking. The results showed that SC-CO 2 soaking had a limited effect on shale's physical properties. After soaking in brine, the degree of alteration in the physical properties of the shale increased. Furthermore, under the condition of SC-CO 2 + brine soaking, the mineral content and microstructure of shale changed most obviously. Following 28 days' soaking period, the microelastic modulus experienced an ultimate degradation extent of 44.99%, while the hardness experienced an ultimate degradation extent of 65.20%. The UCS, macroelastic modulus, and tensile strength were reduced by 47.23, 35.93, and 39.08%, respectively. Under the condition of SC-CO 2 + brine soaking, as the duration of soaking increased, the degree of variation of the shale mineral content intensified, the microstructure of shale altered more significantly, and the phenomenon of mineral dissolution and precipitation increased. Hence, as the soaking time increases, the deterioration of the micro-/macromechanical characteristics of the shale becomes more apparent, and the interaction between the soaking fluid and the shale becomes more obvious.

show abstract

Section: Results and Discussionmentioning

confidence: 99%

SC-CO₂ and Brine Exposure Altering the Mineralogy, Microstructure, and Micro- and Macromechanical Properties of Shale

Huang,

Liu,

Kang

et al. 2024

Energy Fuels

View full text Add to dashboard Cite

show abstract

Effects of CO2-saturated brine imbibition on the mechanical and seepage characteristics of Longmaxi shale

Lyu,

Deng,

Tan

et al. 2024

Energy

View full text Add to dashboard Cite

Carbon dioxide storage within coal reservoirs: A comprehensive review

Hosseinzadeh,

Haghighi,

Salmachi

et al. 2024

Geoenergy Science and Engineering

View full text Add to dashboard Cite

Geochemical mechanisms of water/CO2-rock interactions in EGS and its impacts on reservoir properties: A review

Cited by 6 publications

References 159 publications

SC-CO₂ and Brine Exposure Altering the Mineralogy, Microstructure, and Micro- and Macromechanical Properties of Shale

SC-CO₂ and Brine Exposure Altering the Mineralogy, Microstructure, and Micro- and Macromechanical Properties of Shale

Effects of CO2-saturated brine imbibition on the mechanical and seepage characteristics of Longmaxi shale

Carbon dioxide storage within coal reservoirs: A comprehensive review

Contact Info

Product

Resources

About

Geochemical mechanisms of water/CO2-rock interactions in EGS and its impacts on reservoir properties: A review

Cited by 6 publications

References 159 publications

SC-CO2 and Brine Exposure Altering the Mineralogy, Microstructure, and Micro- and Macromechanical Properties of Shale

SC-CO2 and Brine Exposure Altering the Mineralogy, Microstructure, and Micro- and Macromechanical Properties of Shale

Effects of CO2-saturated brine imbibition on the mechanical and seepage characteristics of Longmaxi shale

Carbon dioxide storage within coal reservoirs: A comprehensive review

Contact Info

Product

Resources

About

SC-CO₂ and Brine Exposure Altering the Mineralogy, Microstructure, and Micro- and Macromechanical Properties of Shale

SC-CO₂ and Brine Exposure Altering the Mineralogy, Microstructure, and Micro- and Macromechanical Properties of Shale