为研究吉致密砂砾岩与CO₂和水相互作用规律，基于准噶尔盆地玛湖致密砂砾岩油藏储层条件，开展致密砂砾岩与CO₂和水相互作用实验。结果表明：CO₂溶于水后生成碳酸主要与致密砂砾岩砾石间胶结物中长石、方解石发生化学作用，形成强烈的绕砾溶蚀现象，以溶蚀为主，沉淀为辅，最终使岩石孔隙度和渗透率增加，储层流体渗流能力变强，其中孔隙度和渗透率最大增量分别为3.65%和87.36%。同时，作用后岩石表面粗糙度增加，亲水矿物石英裸露在表面，岩石水相润湿接触角降低7.4°亲水性增强。对CO₂吞吐提高原油采收率具有积极作用，主要增油机理包括以下两点：一是增大孔隙空间提高流体渗流能力；二是改善岩石水相润湿性，提高油藏水相渗吸能力和原油流动能力，从而提高原油采收率。

Based on the reservoir conditions of tight conglomerate reservoirs in the Mahu area of the Junggar Basin, an experiment was conducted to study the interaction between tight conglomerates, CO₂, and water. The results indicate that after CO₂ dissolves in water to form carbonic acid, it primarily reacts chemically with feldspar and calcite in the cement between the conglomerate grains. This leads to significant around-grain dissolution, with dissolution being the main process and precipitation being secondary. Ultimately, this increases the porosity and permeability of the rock, enhancing the reservoir fluid seepage capacity. The maximum increases in porosity and permeability are 3.65% and 87.36%, respectively. Additionally, the surface roughness of the rock increases after the interaction, with hydrophilic mineral quartz exposed on the surface. The water-phase wetting contact angle of the rock decreases by 7.4°, enhancing hydrophilicity. The CO₂ huff and puff process has a positive effect on improving oil recovery, with the main oil-increasing mechanisms being the enlargement of pore space to enhance fluid seepage capacity and the improvement of rock water-phase wettability, which increases reservoir water-phase imbibition capacity and crude oil mobility, thereby improving oil recovery.