榆林-神木地区CO2咸水层封存可注入性分析
Analysis of Injectivity for CO2 Sequestration in Saline Aquifers in the Yulin-Shenmu Region
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摘要: 位于鄂尔多斯盆地东北部的榆林-神木地区不仅具有丰富的碳源，还具有稳定的地质构造，是开展CO2咸水层封存的有利场所。本文针对纸坊组纸3段及石千峰组，开展CO2-水-岩反应实验及CO2驱替实验，旨在分析咸水层的CO2可注入性。CO2-水-岩反应实验表明，CO2注入后，粘土矿物、长石等硅酸盐矿物发生不同程度溶蚀作用，同时出现方解石、石盐等新矿物沉淀。CO2驱替实验表明CO2注入后，砂岩孔隙度增高，说明初始矿物溶蚀作用产生的影响大于矿物沉淀产生的影响，能够有效提高储层的可注入性。经CO2饱和度计算，石千峰组封存潜力较好，是后续开展CO2咸水层封存项目的最佳选层。Abstract: The Yulin-Shenmu region, located in the northeastern Ordos Basin, boasts abundant carbon sources and a stable geological structure, making it an advantageous site for CO2 sequestration in saline aquifers. This study focuses on the Zhi 3 Member of the Zhifang Formation and the Shiqianfeng Formation, conducting CO2-water-rock interaction experiments and CO2 displacement tests to analyze the CO2 injectivity potential of saline aquifers. The CO2-water-rock interaction experiments reveal that upon CO2 injection, silicate minerals such as clay minerals and feldspars undergo varying degrees of dissolution, accompanied by the precipitation of new minerals like calcite and halite. The CO2 displacement tests indicate an increase in sandstone porosity after CO2 injection, suggesting that the initial mineral dissolution effects outweigh those of mineral precipitation, effectively enhancing the injectivity of the reservoir. Based on CO2 saturation calculations, the Shiqianfeng Formation exhibits good sequestration potential and is identified as the optimal target formation for subsequent CO2 sequestration projects in saline aquifers.
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