The Role of Inertinite Characteristics and Coal Porosity of Seam A-1 of Muara Enim Formation in West Merapi, Lahat, South Sumatera, Indonesia

Coal contains a complex network of nano-, meso-, and macro-pore can store fluids allow to flow through it. Nanoporosity in coal is primarily result molecules that have aromatic molecular structures been preserved coal. Most adsorbate compounds, including gases, are stored here. The study area located South Sumatera, West Merapi Area, Lahat Regency. Geologically, the Sumatra Basin belongs Middle-Late Miocene Muara Enim Formation. Using ply-by-ply method, samples were taken directly from Seam-A mine walls outcrop, based on macroscopically determinable lithotype information. During laboratory analyses, microscopically analyzed determine amount porosity, permeability, vitrinite reflectance. purpose this investigate change composition characteristics inertinite macerals when porosity value varied.. Vitrinite content between 91.00-92.80 %; liptinite 0.90-3.40%; 3.70-4.80%; mineral matter 0.7%-1.8%. Withh reflectance average 0.34-0.36%, variation an indication changes plant communities or facies. It generally classified as sub-bituminous (ASTM). Porosity seam A upper 1.9% lower 1.51%, permeability 70.1 mD 27.1%. Composition 0.8% 1.7%. increasing number pore followed by value. maceral predominantly with high level cross-linking, exhibits aromatization condensation. They highest carbon lowest oxygen hydrogen content. maceral's composed void spaces, such open cell lumens semifusinite sclerotinite. cleats percentage volume relation coal, permeability. In has extensive interconnected pores form significant conduits for fluid flow.