成都理工大学学报（自然科学版）2025，Vol.52Issue(4)：620-630,11.DOI:10.12474/cdlgzrkx.2024052001
川南泸州深层页岩孔隙水赋存规律及影响因素
Pore water storage pattern and influencing factors of deep shale in Luzhou,Sichuan Province,China
摘要
Abstract
The deep shale of the Wufeng-Longmaxi Formation in the Luzhou area of southern Sichuan Province is an important target for shale gas exploration and development in China.Clarifying the pore water storage pattern of shale in this area is crucial for shale gas exploration and development.Through indoor experiments,such as low-temperature nitrogen adsorption and saturated-centrifugal magnetic resonance with a set of fresh shale samples collected from the field,we clarify the mineral types and spatial pore characteristics of shale in the study area.The results show that:(1)Under the original geological stratigraphic conditions,the water content of the shale reservoirs of the Wufeng Group and Longmaxi Group ranges from 6.61 to 20.0 mg/g,with an average value of 15.68 mg/g.(2)The pore water storage pattern is mainly adsorbed water and free water.The pore water is mainly stored in shale pores with a diameter of less than 15 nm,and the adsorbed water is mainly stored in pore spaces with an interval smaller than that of free water.Additionally,the pore water is mostly stored in clay minerals,and as the content of clay minerals increases,the content of pore water also increases.This indicates that the pore water is mainly stored in the inorganic pores of shale,which has a certain effect on the adsorbed gas content of shale,leading to a decrease in the gas content of shale.(4)The adsorbed water content in horizontal samples is generally smaller than that in vertical samples,indicating that the development of laminations greatly improves the connectivity and seepage capacity of shale,which makes it easier for free water to discharge under the same differential pressure.In conclusion,effective control of the production pressure difference can affect the connectivity of pores,reducing the pore water content of the shale matrix and changing its storage characteristics,which in turn increases the production of shale gas and the EUR of a single well.关键词
深层页岩气/孔隙水/孔隙结构/页岩层理/赋存规律Key words
deep shale gas/pore water/pore structure/shale stratification/storage pattern分类
天文与地球科学引用本文复制引用
LI Feiyu,DENG Hucheng,XU Hao,SHEN Jie,DENG Naier,ZHAO Shengxian,LIU Yongyang,REN Pengfei,DENG Mingquan,MA Binyang,HE Jianhua..川南泸州深层页岩孔隙水赋存规律及影响因素[J].成都理工大学学报（自然科学版）,2025,52(4):620-630,11.基金项目
国家自然科学基金(42477173) （42477173）
四川省中央引导地方科技发展专项项目(2024ZYD0121) （2024ZYD0121）
成都理工大学珠峰科学研究计划2.0交叉项目支持. （）
