The effects of porosity and permeability changes on simulated supercritical CO 2 migration front in tight glutenite under different effective confining pressures from 1.5 MPa to 21.5 MPa

2020 ◽  
Author(s):  
Liang Xu ◽  
Qi Li ◽  
Matthew Myers ◽  
Yongsheng Tan ◽  
Miao He ◽  
...  
Keyword(s):  
Permeability Changes ◽  
Confining Pressures ◽  
Porosity And Permeability ◽  
Migration Front

scholarly journals Rapid porosity and permeability changes of calcareous sandstone due to CO2-enriched brine injection

2014 ◽  
Vol 41 (2) ◽  
pp. 399-406 ◽  
Author(s):  
Benoit Lamy-Chappuis ◽  
Doug Angus ◽  
Quentin Fisher ◽  
Carlos Grattoni ◽  
Bruce W. D. Yardley
Keyword(s):  
Permeability Changes ◽  
Porosity And Permeability ◽  
Brine Injection

scholarly journals Permeability Changes Resulting from Quartz Precipitation and Dissolution around Upper Crustal Intrusions

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-19 ◽  
Author(s):  
Samuel W. Scott ◽  
Thomas Driesner
Keyword(s):  
Host Rock ◽  
Permeability Reduction ◽  
Rock Permeability ◽  
Permeability Changes ◽  
Order Of Magnitude ◽  
Porosity And Permeability ◽  
Fluid Convection ◽  
Flow Heat ◽  
Primary Porosity ◽  
Host Rocks

It has long been recognized that quartz precipitation from circulating hydrothermal fluids may reduce porosity and permeability near intrusions. However, the magnitude of permeability changes and potential feedbacks between flow, heat transfer, and quartz precipitation/dissolution remain largely unquantified. Here, we present numerical simulations of fluid convection around upper crustal intrusions which explicitly incorporate the feedback between quartz solubility and rock permeability. As groundwater is heated to ~350°C, silica dissolves from the host rock, increasing porosity and permeability. Further heating to supercritical conditions leads to intensive quartz precipitation and consequent permeability reduction. The initial host rock permeability and porosity are found to be main controls on the magnitude and timescales of permeability changes. While the permeability changes induced by quartz precipitation are moderate in host rocks with a primary porosity ≥ 0.05, quartz precipitation may reduce rock permeability by more than an order of magnitude in host rocks with a primary porosity of 0.025. Zones of quartz precipitation transiently change locations as the intrusion cools, thereby limiting the clogging effect, except for host rocks with low initial porosity. This permeability reduction occurs in timescales of hundreds of years in host rocks with initial high permeability and thousands of years in host rocks with intermediate permeability.

scholarly journals Experimental Investigation on Permeability Evolution of Dolomite Caprock under Triaxial Compression

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6535
Author(s):  
Deng Xu ◽  
Jianfeng Liu ◽  
Zhide Wu ◽  
Lu Wang ◽  
Hejuan Liu ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Triaxial Compression ◽  
Confining Pressure ◽  
Test Machine ◽  
Permeability Evolution ◽  
Triaxial Compressive Strength ◽  
Confining Pressures ◽  
Porosity And Permeability ◽  
The Difference ◽  
Maximum Permeability

In order to study the influence of different confining pressures on the stability and airtightness of dolomite underground gas storage, a permeability test under hydrostatic confining pressure, conventional triaxial compression test and gas–solid coupling test under triaxial compression were carried out on MTS815 test machine. During the tests, an acoustic emission (AE) monitoring system was also employed to estimate the rock damage. The experimental results showed that the relationships between permeability, porosity and hydrostatic confining pressure were exponential function and power function, respectively. Increasing confining pressure reduced the porosity and permeability of dolomite, and increased its triaxial compressive strength, but the addition of nitrogen reduced the compressive strength of dolomite by 10~30%, the higher the confining pressure, the smaller the difference. Compared with the maximum permeability under 15 MPa, confining pressure in the gas–solid coupling experiment, the maximum permeability under confining pressure of 30, 45, and 60 MPa is reduced by 42.0%, 84.4%, and 97.9%, respectively. In addition, the AE activity of dolomite decreases significantly with the increase in confining pressure, which also delayed the arrival of the AE active period.

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