DENG Jiasheng, WANG Ziyi, HE Wangda, et al. Experimental study on reaction of chlorite with CO2 aqueous solution[J]. Petroleum Reservoir Evaluation and Development, 2022, (5): 777-783+808. DOI: 10.13809/j.cnki.cn32-1825/te.2022.05.009.
there is a synergistic/coupling effect among minerals because the rocks contain quartz
potassium feldspar
albite and other components
which promotes or inhibits the reaction process to a certain extent. The chlorite is an important clay mineral of sedimentary rocks. In order to clarify the chemical behavior and
change process of the chlorite in the CO
2
aqueous solution
the state of chlorite reacting with CO
2
respectively for 7 and 30 days at 10 MPa and 60 ℃ are systematically evaluated by means of XRD(X-Ray Diffraction)
XRF(X-Ray Fluorescence)
ICP(Inductively Coupled Plasma)
and SEM(Scanning Electron Microscopy)
focusing on the comparison of the change of the solid elements
the crystal structure and the ion concentration in the reaction solution before and after chlorite powder reaction. Combined with the structural characteristics of chlorite
the mechanism of chlorite change is clarified. The results show that the concentrations of Ca
2+
Mg
2+
and Al
3+
in the liquid phase firstly increase and then decrease after the reaction of the chlorite with CO
2
. The concentration of Si
4+
firstly increases and then is stabilized. The crystal planes corresponding to chlorite d(002) and d (004) peaks in the solid phase are destroyed after the reaction
and the mass ratio of Si and Al in the solid element increase from 4.82 to 5.39. Under the acidic conditions
hydroxyl groups in brucite flakes are easier to combine with H
+
and release cations such as Fe
2+
Mg
2+
Al
3+
etc. Because the brucite octahedron is more prone to ion exchange than silica tetrahedron and alumina octahedron
Mg
Al
Fe and other elements in brucite flakes are dissolved before Si and Al in silica tetrahedron and alumina octahedron.
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references
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