地质力学学报2025，Vol.31Issue(6)：1168-1176,9.DOI:10.12090/j.issn.1006-6616.2025099
总系统刚度法在水力裂缝闭合压力测定中的应用
Determination of hydraulic fracture closure pressure based on total system stiffness method:Case studies
摘要
Abstract
[Objective]Hydraulic fracturing is one of the most widely used and ISRM-recommended techniques for in-situ stress measurement in rock masses,where a key step is determining closure pressure from the pressure-decay curve as a proxy for the minimum horizontal principal stress.Conventional interpretation methods mainly rely on tangents or best-fit lines to analyze the pressure-decay rate,making the result highly sensitive to the selected time window and lacking clear physical representation of fracture closure,which introduces uncertainties in closure pressure and stress evaluation.[Methods]This study proposes a method based on the evolution of Total System Stiffness(TSS),in which the pressure-decay curve after shut-in is transformed into a TSS curve to better capture fracture-closure behavior,and the method is applied to hydraulic-fracturing datasets from different boreholes,lithologies and depths.[Results]The evolution of TSS after shut-in can be divided into three main stages whose features can be used to identify upper and lower bounds of closure pressure and to evaluate whether the pressure curve is suitable for in-situ stress interpretation;closure pressures obtained in this way show reduced sensitivity to the choice of time window compared with conventional approaches.[Conclusion]The TSS method provides clear physical meanings for the beginning and end of fracture closure and determines closure pressure directly from pressure data,without fitting or extrapolation.[Significance]The method offers a practical tool for improving closure-pressure interpretation and is expected to be widely applicable in hydraulic-fracturing-based in-situ stress analysis.关键词
地应力/水压致裂/压力瞬态分析/闭合压力/总系统刚度Key words
in-situ stress/hydraulic fracturing/pressure transient analysis/closure pressure/total system stiffness分类
天文与地球科学引用本文复制引用
YANG Yuehui,SUN Dongsheng,WU Bangchen,LI Awei,LI Ran,QIN Xianghui,SUN Weifeng,MENG Wen,CHEN Qunce..总系统刚度法在水力裂缝闭合压力测定中的应用[J].地质力学学报,2025,31(6):1168-1176,9.基金项目
深地国家科技重大专项(2024ZD1000701) （2024ZD1000701）
国家自然科学基金项目(42174122) （42174122）
中国地质科学院地质力学研究所基本科研业务费项目(DZLXJK202407) （DZLXJK202407）
中国地质调查局地质调查项目(DD20230100401) This research is financially supported by the Deep Earth Probe and Mineral Resources Exploration-National Science and Technology Major Project(Grant No.2024ZD1000701),the General Program of the National Natural Science Foundation of China(Grant No.42174122),the Fundamental Research Fund of the Institute of Geomechanics,Chinese Academy of Geological Sciences(Grant No.DZLXJK202407),and the Geological Survey Project of the China Geological Survey(Grant No.DD20230100401). （DD20230100401）
