Assessment of CO2 sequestration capacity based on hydrogeochemical model of Water-Rock-Gas interactions in the potential storage site within the Belchatow area (Poland)

作者：Labus Krzysztof^*; Tarkowski Radoslaw; Wdowin Magdalena

来源：Gospodarka Surowcami Mineralnymi-Mineral Resources Management, 2010, 26(2): 69-84.

• CO2 sequestration
• hydrogeochemical modeling
• the Belchatow area

Geochemical modeling was aimed at characterising sequestration capacity and the changes of rock matrix and the reservoir parameters, that could occur due to CO2 injection into possible storage site of the Belchatow area (Poland). A thorough research of mineralogical and petrophysical parameters of selected reservoir and cap rocks was performed by means of optical microscopy (planimetric analysis), SEM-EDS, XRD. In the simulations which were performed with use of Geochemist's Workbench 7.0.1. package the data of porosity and physico-chemical parameters of brines occurring at the suitable depth were also used. The simulations were performed in two stages. The first one was aimed at simulating the immediate changes in the reservoir and cap rocks impacted by the beginning of CO2 injection (100 days), the second enabling assessment of long-term effects of sequestration (20 000 years). Results of modeling in the analysed rock-gas-water systems in considered long-term effects of sequestration (20 000 years) have shown that in the modeled period of 20 000 years, the minerals able to trap CO2 are dawsonite, siderite, calcite or dolomite. Calculated mineral-trapping capacity for the sandstones varies between 0.0 and 11.1 kgCO(2)/m(3). For the analysed cap rocks, the mineral-trapping capacity ranges between 0.9 and 15.4 kgCO(2)/m(3). Changes in sandstones porosity, observed due to the simulation, are insignificant. The significant decrease of fine elastic rocks porosity reaches 40 and 30% (for the sample 6873 and 6874, respectively) to the advantage of insulating properties of the cap rocks.

• 出版日期2010