Tarkowski Radosław, Wdowin Magdalena, Manecki Maciej
The Mineral and Energy Economy Research Institute of The Polish Academy of Sciences, Wybickiego 7, 31-261, Kraków, Poland.
Environ Monit Assess. 2015 Jan;187(1):4215. doi: 10.1007/s10661-014-4215-6. Epub 2014 Dec 18.
The objective of the study was determination of experiment-induced alterations and changes in the properties of reservoir rocks and sealing rocks sampled from potential reservoir for CO₂. In the experiment, rocks submerged in brine in specially constructed reactors were subjected to CO₂ pressure of 6 MPa for 20 months at room temperature. Samples of Lower Jurassic reservoir rocks and sealing rocks (sandstones, claystones, and mudstones) from the Zaosie Anticline (central Poland) were analysed for their petrophysical properties (specific surface area, porosity, pore size and distribution) before and after the experiment. Comparison of the ionic composition the brines before and after the experiment demonstrated an increase in total dissolved solids as well as the concentration of sulphates and calcium ions. This indicates partial dissolution of the rock matrix and the cements. As a result of the reaction, the properties of reservoir rocks did not changed significantly and should not affect the process of CO₂ storage. In the case of the sealing rocks, however, the porosity, the framework density, as well as the average capillary and threshold diameter increased. Also, the pore distribution in the pore space changed in favour of larger pores. The reasons for these changes could not be explained by petrographic characteristics and should be thoroughly investigated.
该研究的目的是确定从潜在的二氧化碳储层中采集的储集岩和封闭岩在实验诱导下的改变以及性质变化。在实验中，将岩石浸没在特制反应器中的盐水中，在室温下承受6兆帕的二氧化碳压力20个月。对采自波兰中部早斯耶背斜的下侏罗统储集岩和封闭岩（砂岩、泥岩和页岩）样本在实验前后的岩石物理性质（比表面积、孔隙度、孔径和分布）进行了分析。实验前后盐水离子组成的比较表明，总溶解固体以及硫酸盐和钙离子浓度有所增加。这表明岩石基质和胶结物发生了部分溶解。反应的结果是，储集岩的性质没有显著变化，且不应影响二氧化碳的储存过程。然而，对于封闭岩而言，孔隙度、骨架密度以及平均毛管直径和阈值直径都增加了。此外，孔隙空间中的孔隙分布发生了变化，有利于更大的孔隙。这些变化的原因无法用岩石学特征来解释，应进行深入研究。
