Quantitative characterization of the brittleness of deep shales by integrating mineral content,elastic parameters,in situ stress conditions and logging analysis
作者机构：CCDC Geological Exploration&Development Research InstituteChengdu610056SichuanChina China University of Petroleum(Beijing)ChangpingBeijing102249China Exploration and Development Department of Chongqing Shale Gas Exploration and Development Co.Ltd.Chongqing834000China
出 版 物：《International Journal of Coal Science & Technology》 (国际煤炭科学技术学报（英文）)
年 卷 期：2024年第11卷第1期
页 面：167-179页
核心收录：
学科分类：0709[理学-地质学] 081803[工学-地质工程] 070901[理学-矿物学、岩石学、矿床学] 08[工学] 0818[工学-地质资源与地质工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）]
基 金：The PetroChina Innovation Foundation(2019D-5007-0202)
主 题：Deep shale reservoirs Brittleness Pressure effect Evaluation method Longmaxi formation Sichuan Basin
摘 要：Deep shale reservoirs(3500–4500 m)exhibit significantly different stress states than moderately deep shale reservoirs(2000–3500 m).As a result,the brittleness response mechanisms of deep shales are also *** is urgent to investigate methods to evaluate the brittleness of deep shales to meet the increasingly urgent needs of deep shale gas *** this paper,the quotient of Young’s modulus divided by Poisson’s ratio based on triaxial compression tests under in situ stress conditions is taken as SSBV(Static Standard Brittleness Value).A new and pragmatic technique is developed to determine the static brittleness index that considers elastic parameters,the mineral content,and the in situ stress conditions(BIEMS).The coefficient of determination between BIEMS and SSBV reaches 0.555 for experimental data and 0.805 for field *** coefficient is higher than that of other brittleness indices when compared to *** can offer detailed insights into shale brittleness under various conditions,including different mineral compositions,depths,and stress *** technique can provide a solid data-based foundation for the selection of‘sweet spots’for single-well engineering and the comparison of the brittleness of shale gas production layers in different areas.
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