Deep shale gas reservoirs commonly contain connate water, which affects the enrichment and migration of shale gas and has attracted the attention of many scholars. It is significant to quantitatively estimate the amounts of adsorbed and free water in shale matrix pores, considering the different impacts of pore water (adsorbed water and free water) on shale gas. In this paper, pore water in six deep shale samples from the Wufeng-Longmaxi Formations in the Luzhou area, southern Sichuan Basin, China, was quantitatively evaluated by saturation-centrifugation experiments. Further, the impact of shale material composition and microstructure on the pore water occurrence was analyzed. The results show that amounts of adsorbed and free water are respectively 1.7967–9.8218 mg/g (mean 6.4501 mg/g) and 9.5511–19.802 mg/g (mean 13.9541 mg/g) under the experimental conditions (30°C, distilled water). The ratio of adsorbed water to total water is 15.83%–42.61% (mean 30.45%). The amounts of adsorbed and free water are related to the pore microstructure and material compositions of shale. The specific surface area of shale controls the amount of adsorbed water, and the pore volume controls the amount of free water; organic pores developed in shale solid asphalt contribute specific surface area and pore volume, and inorganic pores developed in clay mineral contribute pore volume. Therefore, the pores of shale solid asphalt accumulate the adsorbed water and free water, and the pores of clay minerals mainly accumulate the free water.

深层页岩气藏普遍含有原生水，影响页岩气的富集和运移，引起了众多学者的关注。考虑孔隙水（吸附水和游离水）对页岩气的不同影响，定量估算页岩基质孔隙中吸附水和游离水的量具有重要意义。本文通过饱和离心实验对四川盆地南部泸州地区五峰组—龙马溪组6个深层页岩样品的孔隙水进行了定量评价。进一步分析了页岩物质成分和微观结构对孔隙水赋存的影响。结果表明，在实验条件下（30°C，蒸馏水），吸附水量和游离水量分别为1.7967-9.8218 mg/g（平均6.4501 mg/g）和9.5511-19.802 mg/g（平均13.9541 mg/g）。 ）。吸附水占总水的比例为15.83%~42.61%（平均30.45%）。吸附水和游离水的量与页岩的孔隙微观结构和物质组成有关。页岩的比表面积控制吸附水量，孔隙体积控制游离水量；页岩固体沥青中发育的有机孔贡献了比表面积和孔体积，粘土矿物中发育的无机孔贡献了孔体积。因此，页岩固体沥青的孔隙中聚集了吸附水和游离水，而粘土矿物的孔隙中主要聚集了游离水。