A Study on the Dissolution Behavior of Typical Minerals in Continental Deposited Reservoirs during CO 2 Geological Storage

Kai Wang, Weifeng Lv (), Zemin Ji, Ninghong Jia, Shumin Ni, Wen Jiang, Jinhong Cao and Moxi Zhang
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Kai Wang: University of Chinese Academy of Sciences, Beijing 100049, China
Weifeng Lv: Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
Zemin Ji: Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
Ninghong Jia: Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
Shumin Ni: University of Chinese Academy of Sciences, Beijing 100049, China
Wen Jiang: University of Chinese Academy of Sciences, Beijing 100049, China
Jinhong Cao: University of Chinese Academy of Sciences, Beijing 100049, China
Moxi Zhang: University of Chinese Academy of Sciences, Beijing 100049, China

Energies, 2023, vol. 16, issue 22, 1-17

Abstract: CO 2 sequestration in saline aquifers is one of the most potential sequestration modes, and saline aquifers are ideal sites for CO 2 geological sequestration. After CO 2 is injected into a saline aquifer, it will have a long-term complex geochemical reaction with the formation of minerals and water, and the minerals will undergo multiple reactions such as dissolution and reprecipitation. Therefore, an in-depth study of the geochemical reaction mechanisms between CO 2 and formation minerals is of great significance to the accurate calculation and prediction of CO 2 storage volume and the safety evaluation of long-term CO 2 sequestration. In China, continental saline aquifers are widely distributed, whose mineral compositions and texture maturity are markedly different from those of the marine sedimentary basins in North America, and their stratigraphic environments are more complicated. The studies on the CO 2 –water–rock (mineral) still have many research gaps or insufficiencies, and there is no report on the dissolution mechanisms of individual minerals in the reaction. Taking one certain block of Daqing Oilfield, which is a typical continental deposit in China, as an example, we analyze the dissolution laws and four types of typical continental deposited minerals under the effect of CO 2 and the change features of ionic compositions and pH of the formation water in the process of geochemical reaction. The research results indicate that CO 2 has different dissolution degrees for the four types of minerals, among which, feldspar, as the main mineral in continental sedimentary formations, has the lowest dissolution rate. Furthermore, in terms of the water type (Na+-enriched NaHCO 3 ) of the saline aquifer in the deep part of the continental deposit, feldspar can precipitate into the secondary minerals represented by dawsonite in the later stage, which can act as the potential minerals of carbon fixation to increase the CO 2 mineralization storage volume in continental deposited saline aquifers.

Keywords: saline aquifer; CO 2 –water–rock (mineral) reaction; CO 2 storage; dawsonite (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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