【摘要】 针对四川盆地陆相和海陆过渡相页岩气储层孔隙较为发育、含气量高但开发效果较差的问题，联合场发射扫描电镜、流体自发渗吸实验、水分平衡实验以及低压气体吸附实验研究储层孔隙润湿性和孔隙水赋存对页岩有效储集空间孔隙结构的影响。研究结果表明：海陆过渡相龙潭组页岩储层水润湿性较强，陆相大安寨段页岩储层更倾向于油润湿；2个层段中黏土质页岩孔隙的水润湿性最强，其次为混合质页岩和硅质页岩，钙质页岩孔隙的水润湿性最弱；孔隙水赋存使龙潭组和大安寨段页岩的有效储集空间平均下降60%～80%，微孔是孔隙水的主要赋存空间；孔隙水赋存对海陆过渡相龙潭组页岩孔隙总体积的影响程度大于对陆相大安寨段页岩的影响程度，对钙质页岩、硅质页岩、混合质页岩和黏土质页岩孔隙总体积的影响程度依次增大。高质量分数黏土矿物是导致孔隙水润湿性增强的主要因素，它使更多的水分赋存在孔隙中，进而显著影响页岩有效储集空间的孔隙结构。更多还原

【Abstract】 Aiming at the problems of relatively developed pores, high gas bearing content but poor development effect of continental and marine-continental transitional facies shale gas reservoirs in Sichuan Basin, the impact of reservoir pore wettability and pore water occurrence on the pore structure of effective reservoir space in shales were systematically studied, which was combined with field-emission scanning electron microscope observation,fluid spontaneous imbibition experiment, humidity equilibration and low-pressure gas adsorption experiments. The results show that the marine-continental transitional Longtan Formation shales have strong water wettability, while the continental Daanzhai shale reservoirs exhibit a strong oil wettability. In the two shale intervals, the pores of clayey shales show the strongest water wetting behavior, followed by the mixed shales and siliceous shales, while the calcareous shales are the least water wetting. The effective storage space of shale reservoirs in Longtan Formation and Daanzhai Member can decrease by 60%-80% on average in the presence of pore water, greatly influencing the storage capacity. Micropores appear to be the main storage space of pore water. The influence of pore water occurrence on the total pore volume of marine-continental transitional Longtan Formation shales is greater than that of the continental Daanzhai Member shales. The influence of pore water occurrence on the storage capacity of calcareous shales, siliceous shales, mixed shales and clayey shales increases progressively.High mass fraction of clay mineral is the main factor to enhance the water wettability of pores, which will lead to more water stored in the pores and affect the pore structure of shale effective storage space.更多还原