1 comparative investigation on the analytical properties and nanostructure of the Sargelu and Asmari reservoirs https://www.jourcc.com/index.php/jourcc/article/view/jcc521 10.61186/jcc.5.2.1 1 The objective of this research was to gain insight into the composition and nanostructure of two shale formations, Sargelu and Asmari. Among the techniques used are X-ray diffractometry (XRD), X-ray fluorescence (XRF), thermogravimetric analysis (TGA), field emission scanning electron microscopy (FESEM), Fourier-transform infrared spectroscopy (FTIR), FESEM focused ion beam (FIB), and transmission electron microscopy (TEM). According to the XRD results, the main components of both shales were calcite, quartz, and kaolinite. CaO, SiO2, and Fe2O3 were the most common components in both reservoirs, according to the XRF analysis, while P2O5, SrO, and MoO3 were only found in the Asmari formation. According to the TGA study, organic matter and other probable carbonate components comprised 37% of the Sargelu and 40.5% of the Asmari shales. The organic functional groups were detected using FTIR in both samples. Subsequently, various microscopy techniques were utilized to examine different pores, cracks, and nanostructures in each formation. 64 69 Wenjun He Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay, China whe@petrochina.com.cn Yamin Wang Institute of Energy, Peking University, Beijing China yamin.wang@pku.edu.cn Liang Zhong SOperation Area of Fengcheng Oilfield, PetroChina Xinjiang Oilfield Company, Karamay China fchw@petrochina.com.cn Seyed Ali Delbari Department of Engineering Sciences, Faculty of Advanced Technologies, University of Mohaghegh Ardabili, Ardabil Iran adelbari@gmail.com Abbas Sabahi Namini Department of Engineering Sciences, Faculty of Advanced Technologies, University of Mohaghegh Ardabili, Ardabil Iran abbas.sabahi.64@gmail.com Dokyoon Kim Kim Department of Bionano Engineering, Hanyang University, Ansan 15588, Republic of Korea Korea Institute of Nanosensor Technology, Hanyang University, Ansan 15588, Republic of Korea Korea kimdk@hanyang.ac.kr Ho Won Jang Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul 08826, Republic of Korea Korea hwjang@snu.ac.kr Mohammadreza Shokouhimehr Institute of Nanosensor Technology, Hanyang University, Ansan 15588, Republic of Korea Korea Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul 08826, Republic of Korea Korea rezamehr2023@gmail.com Shale Reservoir Nanostructure Analysis Characterization Scanning electron microscopy Article1.pdf [1] R.A. Kerr, Natural gas from shale bursts onto the scene, Science 328 (2010) 1624–1626.## [2] M.A. Hanif, F. Nadeem, R. Tariq, U. Rashid, Renewable and Alternative Energy Resources, Elsevier Science, Netherlands, 2021.## [3] J. Cooper, L. Stamford, A. Azapagic, Shale Gas: A Review of the Economic,Environmental, and Social Sustainability, Energy Technology 4(7) (2016) 772-792.##[4] P. Liu, Y. Feng, L. Zhao, N. Li, Z. Luo, Technical status and challenges of shale gas development in Sichuan Basin, China, Petroleum 1 (2015) 1-7.## [5] J. Bellani, H.K. Verma,D. Khatri, D. Makwana, M. Shah, Shale gas: a step toward sustainable energy future, Journal of Petroleum Exploration and Production Technology 11(5) (2021) 2127-2141. ##[6] A. Striolo, D.R. Cole, Understanding Shale Gas: Recent Progress and Remaining Challenges, Energy and Fuels 31(10) (2017) 10300-10310. ##[7] Z. Li, Z. Lei, W. Shen, D.A. Martyushev, X. Hu, A Comprehensive Review of the Oil Flow Mechanism and Numerical Simulations in Shale Oil Reservoirs,Energies 16(8) (2023)3516. ##[8] M. Josh, L. Esteban, C. Delle Piane, J. Sarout, D.N. Dewhurst, M.B. Clennell, Laboratory characterisation of shale properties, Journal of Petroleum Science and Engineering 88-89 (2012) 107-124. ##[9] D. Feng, Z. Chen, W. Zhao, K. Wu, J. Li, X. Li, Y. Gao,S. Zhang, F. Peng, Determination of Apparent Pore Size Distributions of Organic Matter and Inorganic Matter in Shale Rocks Based on Water and N2 Adsorption, Energy and Fuels 36(19) (2022) 11787-11797.## [10] J. Yang, J. Hatcherian, P.C. Hackley, A.E. Pomerantz, Nanoscale geochemical and geomechanical characterization of organic matter in shale, Nature Communications 8(2179) (2017) 1-9.##[11] K.-Q. Liu, Z.-J. Jin, L.-B. Zeng, M.-D. Sun, B. Liu, H.W. Jang, M. Safaei-Farouji, M. Shokouhimer, M. Ostadhassan, Microstructural analysis of organic matter in shale by SAXS and WAXS methods, Petroleum Science 19(3) (2022) 979-989. ## [12] H. Zhang, D.Y. Moh, X. Wang, R. Qiao, Review on Pore-Scale Physics of Shale Gas Recovery Dynamics: Insights from Molecular Dynamics Simulations, Energy Fuels 36 (2022) 14657–14672.##[13] D. Xia, Z. Yang, T. Gao, H. Li, W. Lin, Characteristics of micro- and nanopores in shale oil reservoirs, Journal of Petroleum Exploration and Production 11(1) (2021) 157-169. ##[14] P. Zhang, S. Lu, J. Li, H. Xue, W. Li, P. Zhang, Characterization of shale pore system: A case study of Paleogene Xin’gouzui Formation in the Jianghan basin,China, Marine and Petroleum Geology 79 (2017) 321–334.##[15] A. Ghajari, M. Kamali, S.Mortazavi, A comprehensive study of Laffan Shale Formation in Sirri oil fields, offshoreIran: Implications for borehole stability, Journal of Petroleum Science and Engineering 107 (2013)50–56. ## [16] H. Tian, L. Pan, X. Xiao, R. Wilkins, Z. Meng, B. Huang, A preliminary study on the pore characterization of Lower Silurian black shales in the Chuandong Thrust Fold Belt, Southwestern China using low pressure N2 adsorption and FESEM methods, Marine and Petroleum Geology 48 (2013) 8–19.##[17] M. Sun, J. Zhao, Z. Pan, Q. Hu, B. Yu, Y. Tan, L. Sun, L. Bai, C. Wu, T.P. Blach, Y. Zhang, C. Zhang, G. Cheng, Pore characterization of shales: A review of small angle scattering technique, Journal of Natural Gas Science and Engineering 78 (2020) 103294.## /[19] P. Tahmasebi, F. Javadpour, M. Sahimi, Three-Dimensional Stochastic Characterization of Shale SEM Images, Transport in Porous Media 110 (2015) 521–531.## [20] P. Zhang, S. Lu, J. Li, H. Xue, W. Li, P. Zhang, Characterization of shale pore system: A case study of Paleogene Xin’gouzui Formation in the Jianghan basin, China, Marine and Petroleum Geology 79 (2017) 321–334.##[21] Y. Wang, Y. Zhu, S. Chen, W. Li, Characteristics of the Nanoscale Pore Structure in Northwestern Hunan Shale Gas Reservoirs Using Field Emission Scanning Electron Microscopy, High-Pressure Mercury Intrusion, and Gas Adsorption, Energy Fuels 28 (2014) 945–955. ##[22] Y. Han, D. Kwak, S.Q. Choi, C. Shin, Y. Lee, H. Kim, Pore Structure Characterization of Shale Using Gas Physisorption: Effect of Chemical Compositions, Minerals 7(5) (2017) 66.## [23] K. Liu, M. Ostadhassan, W. Jang, Comparison of fractal dimensions from nitrogen adsorption data in shale via di ferent models, RSC Advances 11 (2021) 2298–2306.## [24] H. Lee, N. Oncel, B. Liu, A. Kukay, F. Altincicek, R.S. Varma, M. Shokouhimehr, M. Ostadhassan, Structural Evolution of Organic Matter in Deep Shales by Spectroscopy (1H and 13C Nuclear Magnetic Resonance, X ray Photoelectron Spectroscopy, and Fourier Transform Infrared) Analysis, Energy Fuels 34 (2020) 2807–2815.## [25] A. Al-Otoom, M. Allawzi, A. Ajlouni, F. Abu-Alrub, M. Kandah, The use of oil shale ash in the production of biodiesel from waste vegetable oil, Journal of Renewable and Sustainable Energy 4 (2012) 063123.##[26] M.A. Rahman, T. Oomori, Structure, crystallization and mineral composition of sclerites in the alcyonarian coral, Journal of Crystal Growth 310 (2008) 3528–3534.##[27] A.F. Muhammad, M.S. El Salmawy, A.M. Abdelaala, S. Sameah, El-Nakheil oil shale: Material characterization and effect of acid leaching, Oil Shale 28 (2011) 528–547.##[28] A. Negahdari, M. Ziaii, J. Ghiasi-Freez, Application of discriminant analysis for studying the source rock potential of probable formations in the Lorestan basin, International Journal of Mining and Geo-Engineering 48 (2014) 31-54.##[29] A. Maleki,M.H. Saberi, S.A. Moallemi, M.H. Jazayeri, Evaluation of hydrocarbon generation potential of source rock using two-dimensional modeling of sedimentary basin: a case study in North Dezful Embayment, Southwest Iran, Journal of Petroleum Exploration and Production Technology 11 (2021) 2861–2876.##[30] A. Shekarifard, Thermochemical analysis of the oil shale, from the Middle Jurassic Sargelu Formation, Southwest Iran: A thermo-oxidative approach, Geopersia 12(1) (2022) 127-139.##[31] A. Seyrafian, Microfacies and depositional environments of the Asmari formation, at Dehdez area (a correlation across Central Zagros Basin), Carbonates Evaporites 15 (2000) 121–129.##[32] M. Moradi, R. Moussavi-Harami, A. Mahboubi, M. Khanehbad, A. Ghabeishavi,Rock typing using geological and petrophysical data in the Asmari reservoir, Aghajari Oilfield, SW Iran, Journal of Petroleum Science and Engineering 152 (2017) 523–537.##[33] M.R.M. Fereidoni, M. Lotfi, N. Rashid nejad, Evaluate geochemical trace elements of Qalikuh oil shale (Southwest Aligoodarz) using elemental analysis and rock eval pyrolysis, Scientific Quarterly Journal of Geosciences 25 (2016) 171–180.##[34] V. Zarei, A. Nasiri, Stabilizing Asmari Formation interlayer shales using water-based mud containing biogenic silica oxide nanoparticles synthesized, Journal of Natural Gas Science and Engineering 91 (2021) 103928.##[35] K. Shimokawa, N. Ima, M. Hirota, Dating of a volcanic rock by electron spinresonance, Chemical Geology 46 (1984) 365–373.##[36] C.B. Azzoni, D.D.I. Martino, C. Chiavari, E. Sibilia, M. Vandini, Electron paramagnetic resonance of mosaic glasses from the Mediterranean area, Archaeometry 4 (2002) 543–554.## [37] B. Khani, M. Kamali, M. Mirshahani, M. Memariani, M. Bargrizan, Maturity modeling and burial history reconstruction for Garau and Sargelu formations in Lurestan basin, south Iran, Arabian Journal of Geosciences 11 (2018) 39.## [38] N.E. Altun, C. Hicyilmaz, J.Y. Hwang, A.S. Bagci, Beneficiation of Himmetoǧlu oil shale by flotation as a solid fuel substitute. Part 1. Materials characteristics and flotation behavior, Energy Fuels 20 (2006) 214–221.## [39] B. Chen, X. Han, X. Jiang, In-situ FTIR analysis of the evolution of functional groups of oil shale during the pyrolysis, Energy Fuels 30 (2016) 5611–5616. ##[40] Y. Wang, Y. Zhu, H. Wang, G. Feng, Nanoscale pore morphology and distribution of lacustrine shale reservoirs: Examples from the Upper Triassic Yanchang Formation, Ordos Basin, Journal of Energy Chemistry 24 (2015) 512–519.