天然气勘探与开发2025，Vol.48Issue(2)：39-48,10.DOI:10.12055/gaskk.issn.1673-3177.2025.02.004
水化作用对页岩孔隙结构及声波特性的影响
Hydration controls on pore structure and acoustic attributes in shale
摘要
Abstract
Working fluid invading into shale gas reservoirs may trigger hydration damage to shale under physical and chemical interactions during drilling and completion,further leading to fracture propagation and extension or even borehole instability,which may badly affect drilling safety and stimulation performance.Therefore,some experiments about hydration,ultrasonic transmission and nuclear magnetic resonance(NMR)were implemented on shale samples from the Lower Silurian Longmaxi Formation of Sichuan Basin in an effort to figure out hydration controls on shale's pore structure and acoustic attributes.Variations in pore structure,acoustic velocity,and frequency-domain signals at different hydration times were discussed for these samples to reveal an intrinsic relation between the first two variations.Furthermore,dependent on elastic parameters,the quantitative characterization was established on the degree of hydration damage to shale.Results show that(i)in term of the pore structure throughout the hydration,small pores increase in their number,the size gets bigger successively,and large pores and microfractures emerge;(ii)with the increase of hydration time,the velocity decreases in a dramatic and then gentle manner.Low-frequency components evidently become lesser in frequency-domain signals after shale hydration;and(iii)the hydration damage accelerates and then slows down little by little,fast damage in the first six hours,sluggish in the following eighteen hours,and tending to be stable in the later twenty-four hours.关键词
页岩/水化作用/超声波透射/核磁共振/孔隙结构/声波速度Key words
Shale/Hydration/Ultrasonic transmission/NMR/Pore structure/Acoustic velocity引用本文复制引用
高可攀..水化作用对页岩孔隙结构及声波特性的影响[J].天然气勘探与开发,2025,48(2):39-48,10.基金项目
国家自然科学基金项目(编号:41872167). （编号:41872167）
