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| Evaluation of multi-scale mechanical properties of conglomerate using nanoindentation and homogenization methods：A case study on tight conglomerate reservoirs in southern slope of Mahu sag |
| ZHANG Zhaopeng1，ZHANG Shicheng1，SHI Shanzhi2，ZOU Yushi1，LI Jianmin2，MA Xinfang1，XIAO Fengchao1 |
| (1. State Key Laboratory of Petroleum Resources and Exploration，China University of Petroleum(Beijing)，Beijing 102249，China；2. Engineering Technology Research Institute，PetroChina Xinjiang Oilfield Company，Karamay，Xinjiang 834000，China) |
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Abstract Because the unconsolidated cores drilled from some of the tight conglomerate reservoirs in southern slope of Mahu sag indicate a strong water sensitivity，it is difficult to accurately evaluate their rock mechanical properties by using conventional mechanical tests. In this study，a cross-scale evaluation method for the macroscopic rock mechanical properties of conglomerate was proposed. Specifically，the elastic modulus，indentation hardness and fracture toughness of gravel and matrix were characterized at meso-scale through nanoindentation experiments. Afterward，the macroscopic mechanical properties of conglomerate were obtained by applying the homogenization method. Results show that the mechanical responses of the located indentations into gravels indicate a feature of clustering，reflecting the mechanical properties of quartz and feldspar. Different from that，the grid indentation in matrix exhibits complex mechanical responses，which primarily represent the mechanical properties of quartz particles，clay matrix and composite phase. The four-component model of matrix is able to consider the effects of the interface phase，the mineral alteration phase and the substrate-effect phase，such that the simple mechanical responses of the quartz particle and the clay matrix and the complex mechanical responses of the composite phase can be unified. The predicted macroscopic elastic modulus of conglomerate by using the Mori-Tanaka homogenization method tends to be higher than the measured value of rock cores. However，the correction by the deviation factor can give more accurate prediction ranges of the elastic moduli for the conglomerates with variable mineral contents and litho-facies，providing a valuable guidance for the mechanical parameter characterization of tight conglomerate reservoirs in Mahu areas.
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[1] 康 逊，胡文瑄，王 剑，等. 扇三角洲砂砾岩油藏储层敏感性研究——以准噶尔盆地玛湖凹陷百口泉组为例[J]. 中国矿业大学学报，2017，46(3)：596–605.(KANG Xun，HU Wenxuan，WANG Jian，et al. Fan-delta sandy conglomerate reservoir sensitivity：A case study of the Baikouquan formation in the Mahu sag，Junggar basin[J]. Journal of China University of Mining and Technology，2017，46(3)：596–605.(in Chinese))
[2] 张昌民，王绪龙，朱 锐，等. 准噶尔盆地玛湖凹陷百口泉组岩石相划分[J]. 新疆石油地质，2016，37(5)：606–614.(ZHANG Changmin，WANG Xulong，ZHU Rui，et al. Litho-facies classification of Baikouquan formation in Mahu Sag，Junggar Basin[J]. Xinjiang Petroleum Geology，2016，37(5)：606–614.(in Chinese))
[3] LIU J T，GE H K，ZHANG Z X，et al. Influence of mechanical contrast between the matrix and gravel on fracture propagation of glutenite[J]. Journal of Petroleum Science and Engineering，2022，208：109639.
[4] 俞天喜，袁 峰，周培尧，等. 玛南斜坡上乌尔禾组颗粒支撑砾岩裂缝扩展形态[J]. 新疆石油地质，2021，42(1)：53–62.(YU Tianxi，YUAN Feng，ZHOU Peiyao，et al. Fracture propagating shapes in gravel?supported conglomerate reservoirs of upper Wuerhe Formation on Manan slope，Mahu Sag[J]. Xinjiang Petroleum Geology，2021，42(1)：53–62.(in Chinese))
[5] 张泰华. 微/纳米力学测试技术——仪器化压入的测量、分析、应用及其标准化[M]. 北京：科学出版社，2013：3–23.(ZHANG Taihua. Micro/nano-scale mechanical testing techniques- measurement，analysis，application and standardization of instrumented indentation[M]. Beijing：Science Press，2013：3–23.(in Chinese))
[6] MA Z Y，GAMAGE R P，ZHANG C P. Application of nanoindentation technology in rocks：a review[J]. Geomechanics and Geophysics for Geo-energy and Geo-Resources，2020，6(60)：1–27.
[7] SONG R，WANG Y，ISHUTOV S，et al. A comprehensive experimental study on mechanical behavior，microstructure and transport properties of 3D-printed rock analogs[J]. Rock Mechanics and Rock Engineering，2020，53：5 745–5 765.
[8] SONG R，WANG Y，SUN S Y，et al. Evaluation of elastoplastic properties of brittle sandstone at microscale using micro-indentation test and simulation[J]. Energy Science and Engineering，2020，8：3 490–3 501.
[9] LIU K，OSTADHASSAN M，BUBACH B. Applications of nano- indentation methods to estimate nanoscale mechanical properties of shale reservoir rocks[J]. Journal of Natural Gas Science and Engineering，2016，35：1 310–1 319.
[10] SUN C L，LI G C，GOMAH M E，et al. Creep characteristics of coal and rock investigated by nanoindentation[J]. International Journal of Mining Science and Technology，2020，30(6)：769–776.
[11] ZESZOTARSKI J C，CHROMIK R R，VINCI R P，et al. Imaging and mechanical property measurements of kerogen via nanoindentation[J]. Geochimica et Cosmochimica Acta，2004，68(20)：4 113–4 119.
[12] SUN C L，LI G C，GOMAH M E，et al. Meso-scale mechanical properties of mudstone investigated by nanoindentation[J]. Engineering Fracture Mechanics，2020，238：107 245.
[13] CONSTANTINIDES G，CHANDRAN K S R，ULM F -J，et al. Grid indentation analysis of composite microstructure and mechanics：Principles and validation[J]. Materials Science and Engineering A，2006，430：189–202.
[14] ZHU W Z，HUGHES J J，BICANIC N，et al. Nanoindentation mapping of mechanical properties of cement paste and natural rocks[J]. Materials Characterization，2007，58：1 189–1 198.
[15] XU J J，TANG X H，WANG Z Z，et al. Investigating the softening of weak interlayers during landslides using nanoindentation experiments and simulations[J]. Engineering Geology，2020，277：105 801.
[16] 刘建军，吴明洋，宋 睿，等. 低渗透油藏储层多尺度裂缝的建模方法研究[J]. 西南石油大学学报：自然科学版，2017，39(4)：90–103.(LIU Jianjun，WU Mingyang，SONG Rui，et al. Study on simulation method of multi-scale fractures in low permeability reservoirs[J]. Journal of Southwest Petroleum University：Science and Technology，2017，39(4)：90–103.(in Chinese))
[17] 胡 敏，徐国元，胡盛斌，等. 基于Eshelby张量和Mori-Tanaka等效方法的砂卵石土等效弹性模量研究[J]. 岩土力学，2013，34(5)：1 437–1 448.(HU Min，XU Guoyuan，HU Shengbin，et al. Study of equivalent elastic modulus of sand gravel soil with Eshelby tensor and Mori-Tanaka equivalent method[J]. Rock and Soil Mechanics，2013，34(5)：1 437–1 448.(in Chinese))
[18] 陈 平，韩 强，马天寿，等. 基于微米压痕实验研究页岩力学特性[J]. 石油勘探与开发，2015，42(5)：662–670.(CHEN Ping，HAN Qiang，MA Tianshou，et al. The mechanical properties of shale based on micro-indentation test[J]. Petroleum Exploration and Development，2015，42(5)：662–670.(in Chinese))
[19] 时 贤，蒋 恕，卢双舫，等. 利用纳米压痕实验研究层理性页岩岩石力学性质——以渝东南酉阳地区下志留统龙马溪组为例[J]. 石油勘探与开发，2019，46(1)：155–164.(SHI Xian，JIANG Shu，LU Shuangfang，et al. Investigation of mechanical properties of bedded shale by nanoindentation tests：A case study on lower silurian Longmaxi formation of Youyang area in southeast Chongqing，China[J]. Petroleum Exploration and Development，2019，46(1)：155–164.(in Chinese))
[20] 张昌民，宋新民，王小军，等. 支撑砾岩的成因类型及其沉积特征[J]. 石油勘探与开发，2020，47(2)：272–285.(ZHANG Changmin，SONG Xinmin，WANG Xiaojun，et al. Origin and depositional characteristics of supported conglomerates[J]. Petroleum Exploration and Development，2020，47(2)：272–285.(in Chinese))
[21] OLIVER W C，PHARR G M. An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments[J]. Journal of Materials Science，1992，7(6)：1 564–1 583.
[22] ZENG Q，FENG Y，XU S L. A discussion of “Application of nano-indentation methods to estimate nanoscale mechanical properties of shale reservoir rocks” by K Liu，M Osatadhassan and B Bubach[J]. Journal of Natural Gas Science and Engineering，2017，42：187–189.
[23] CHARLTON T S，GOODARZI M，ROUAINIA M，et al. Effect of diagenesis on geomechanical properties of organic-rich calcareous shale：a multiscale investigation[J]. Journal of Geophysical Research：Solid Earth，2021，126：1–23.
[24] 李 宁，张士诚，马新仿，等. 砂砾岩储层水力裂缝扩展规律试验研究[J]. 岩石力学与工程学报，2017，36(10)：2 383–2 392.(LI Ning，ZHANG Shicheng，MA Xinfang，et al. Experimental study on the propagation mechanism of hydraulic fracture in glutenite formations[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(10)：2 383–2 392.(in Chinese))
[25] 孙长伦，李桂臣，GOMAH Mohamed Elgharib，等. 基于纳米压痕技术的破碎煤样力学特性实验研究[J]. 煤炭学报，2020，45(增2)：682–691.(SUN Changlun，LI Guichen，GOMAH Mohamed Elgharib，et al. Experimental investigation on the mechanical properties of crushed coal samples based on the nanoindentation technique[J]. Journal of China Coal Society，45(Supp.2)：682–691.(in Chinese))
[26] LI Y C，LUO S M，LU M，et al. Cross-scale characterization of sandstones via statistical nanoindentation：Evaluation of data analytics and upscaling models[J]. International Journal of Rock Mechanics and Mining Sciences，2021，142：104 738.
[27] 张 研，韩 林. 细观力学基础[M]. 北京：科学出版社，2014：3–102.(ZHANG Yan，HAN Lin. Foundation of mesomechanics[M]. Beijing：Science Press，2014：3–102.(in Chinese))
[28] MORI T，TANAKA K. Average stress in matrix and average elastic energy of materials with misfitting inclusions[J]. Acta Metall，1973，21(5)：571–574.
[29] 刘向君，熊 健，梁利喜，等. 玛湖凹陷百口泉组砂砾岩储集层岩石力学特征与裂缝扩展机制[J]. 新疆石油地质，2018，39(1)：83–91.(LIU Xiangjun，XIONG Jian，LIANG Lixi，et al. Rock mechanical characteristics and fracture propagation mechanism of sandy conglomerate reservoirs in Baikouquan Formation of Mahu Sag[J]. Xinjiang Petroleum Geology，2018，39(1)：83–91.(in Chinese))
[30] ELIYAHU M，EMMANUEL S，DAY-STIRRAT R J，et al. Mechanical properties of organic matter in shales mapped at the nanometer scale[J]. Marine and Petroleum Geology，2015，59：294–304.
[31] GRAHAM S P，ROUAINIA M，APLIN A C，et al. Geomechanical characterisation of organic-rich calcareous shale using AFM and nanoindentation[J]. Rock Mechanics and Rock Engineering，2021，54(1)：303–320.
[32] MAVKO G，MUKERJI T，DVORKIN J. The rock physics handbook: Tools for seismic analysis of porous media[M]. 2nd ed. Cambridge：Cambridge University Press，2010：106–160. |
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2022, Vol. 41 
