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Journal : Journal of Geoscience, Engineering, Environment, and Technology

The Role of Inertinite Characteristics and Coal Porosity of Seam A-1 of Muara Enim Formation in West Merapi, Lahat, South Sumatera, Indonesia Basuki Rahmad; Budi Prayitno; Susilawati S.S.R; Sugeng; Ediyanto
Journal of Geoscience, Engineering, Environment, and Technology Vol. 7 No. 2 (2022): JGEET Vol 07 No 02 : June (2022)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2022.7.2.8986

Abstract

Coal contains a complex network of nano-, meso-, and a macro-pore can store fluids and allow fluids to flow through it. Nanoporosity in coal is primarily a result of molecules that have aromatic molecular structures and have been preserved in coal. Most adsorbate compounds, including gases, are stored here. The study area is located in South Sumatera, West Merapi Area, Lahat Regency. Geologically, the area in South Sumatra Basin belongs to the Middle-Late Miocene Muara Enim Formation. Using the ply-by-ply method, coal samples were taken directly from Seam-A in the coal mine walls outcrop, based on macroscopically determinable lithotype information. During laboratory analyses, coal is microscopically analyzed to determine the amount of porosity, permeability, and vitrinite reflectance. The purpose of this study is to investigate the change in composition and characteristics of inertinite macerals when the porosity value is varied.. Vitrinite content is between 91.00-92.80 %; liptinite 0.90-3.40%; inertinite 3.70-4.80%; mineral matter 0.7%-1.8%. Withh a vitrinite reflectance average of 0.34-0.36%, the variation in composition is an indication of changes in plant communities or coal facies. It is generally classified as sub-bituminous coal (ASTM). Porosity value of seam A upper is 1.9% and seam A lower 1.51%, permeability value seam A upper is 70.1 mD and seam A lower 27.1%. Composition of mineral matter in seam A upper is 0.8% and seam A lower 1.7%. The increasing number of inertinite pore is followed by lower porosity value. The inertinite maceral is predominantly aromatic with a high level of cross-linking, and exhibits a high level of aromatization and condensation. They have the highest carbon and the lowest oxygen hydrogen content. A coal maceral's porosity is composed of void spaces, such as open cell lumens preserved in semifusinite and sclerotinite. The porosity of cleats is the percentage of volume in relation to volume of coal, and the porosity of permeability. In coal, semifusinite has extensive interconnected pores that can form significant conduits for fluid flow.
Co-Authors Abdul Huda Abdul Huda, Abdul Abdus Salam, Abdus Ade Dian Firdiana Ade Dian Firdiana Adi Atmoko Agus Supriatna Agus Supriyanto Ahmad Hadi Wianto Ahmad Hidayatullah Ahmad Samawi Ahsan R Junaidi Ahsan R Junaidi, Ahsan R Ajeng Leksana Mulia Alfaini, Diana Alfiani Umayya Amanda Oktatiani Ambar Kusuma Astuti Amin, Atssil Revinda Kharisma Anam, Muhammad Mishbahul Andafiya, Robiatul Andini Prima Nur’aini Andriani, Yulika Angeli Putri Anik Agustin Annisa R, Auliyah Anwar, Muhammad Khoirul Aprilia Ema Wardhani Aprilia Ema Wardhani Aprilia, Nurismil Khoir APRIYANTI, DESSY Arandita, Reza Mevia Ardiansyah, Johan Putra Pradana Arief, Mohammad Yahya Arief, Muhammad Yahya Arif, Riyas Syamsul Arifandi, Arifandi Arina Salsabiela Aris Setiawan Arum Sekar Kinasih Asep Sunandar Asim Asim Atika, Iva Nandya Atiyah, Khoriratul Augusto Da Costa Aunillah, Indy Husni Az-Zahra, Irene Elsa Wahyu Aziza, Aziza Aziza, Ummi Aziza, Wahyu Nur Bagas Setyo Ari Widodo Basuki Rahmad Bela Prawisma Bella Dina Fitrasari Buana, Shima Hafidz Adiatri Budi Asri, Dyah Permata Budi Prayitno Budi Susetyo Cahyani, Andita Zahariya Chusna, Mega Putriatul Ciptasari, Ayu Dita Windra Costa, Augusto Da Crisyanti, Veny Manda Danang Aji Prayogo Darmawan, Rivanto Dwi Deni Hadiana Deni Hadiana Dhian Regi Samarta Durin Dian Ayu Rhespati Dian Kusumawati Dian Widiarti Dimas Arif Dewantoro Diniy Hidayatur Rahman Duriat, Ahtu Dzintra IliÅ¡ko Edy Kusnadi Eka Pramono Adi Elfrida Ratnawati Elfrida Wijayanti Endayani, Novi Endro Wahyuno Erfa Dinda Amalia Erine Zhellina Erniyanto, Moh. 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