砂岩储层中CO2-地层水-岩石的相互作用

来源期刊:中南大学学报(自然科学版)2013年第3期

论文作者:王广华 赵静 张凤君 陶怡 杨潇瀛 王怀远

文章页码:1167 - 1173

关键词:CO2;地层水;砂岩;水-岩相互作用

Key words:CO2; formation water; sandstone; water-rock interaction

摘    要:利用高温高压反应釜模拟不同温度条件下CO2-地层水-砂岩间的相互作用,并观察反应前后样品形貌、分析质量和比表面积的变化,讨论反应液pH和各离子浓度的变化原因,进一步阐明CO2-地层水-砂岩相互作用过程中矿物的溶解和沉淀机制。研究结果表明,超临界CO2注入后,随着温度的升高,砂岩中可溶矿物(长石类)的溶蚀作用加剧;样品表面和孔隙中均有新物质生成,主要矿物为石英、高岭石、绿泥石和一些未知的含“C”硅铝酸盐。

Abstract: The interaction among CO2-the underground water-rock was simulated at different temperatures with the high-temperature autoclave. The samples were observed using scanning electron microscope (SEM) and the changes of quality and specific surface area were analyzed. At the same time, the changes of pH and the concentration of ions in the solution were analyzed in order to make the mechanism of the dissolution and precipitation of the minerals clear. The results show that after injection of supercritical CO2, the dissolution of the soluble minerals (feldspar) in the sandstone becomes easier with the increase of temperature. Some new minerals on the surface or in the pores of the sample can be found, such as quartz, kaolinite, chlorite and unknown aluminosilicate containing carbon.

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