COAL CHARACTERISTIC STUDY IN LAHAT, SOUTH SUMATERA AS COALBED METHANE (CBM) RESERVOIR

• Main Author: Nur Listiyowati, Lina
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/55714
• Institution: Institut Teknologi Bandung

Coalbed methane (CBM) is methane produced and stored in the coal. The presence of CBM in coal influenced by geology condition, coal characteristics and reservoir. This research was conducted at Muara Enim Formation which is the formation of economically valuable coal carrier in the South Sumatra Basin. The objective of this study was to determine the relationship of the characteristics of the coal as a reservoir of CBM and gas content is stored. Coal seams are analyzed Seam Kebon, Benuang, Burung, Mangus and Suban. Sampling is done by taking samples of gas and coal samples from the drilling activity. Coal samples from five coal seams are done laboratory analysis to determine the quality of the coal, maceral composition, vitrinite reflectance values / huminit, cleats characteristics, gas content, gas composition, porosity, and density of coal. Based on the known reflectance values huminit rank coal is lignite in the study area, and the producing gas is biogenic methane. The composition and quality of the Seam Kebon, Benuang, Birds, Mangus and Suban not too varied with the content of nitrogen (N) and sulfur (S) is low (<1%). Huminit quite dominant maceral composition ranged from 76.2 to 92.6%, and the content of liptinit between 5 -20.5%. Based on the analysis, the coal in the study area as a good store of CBM with good porosity. Largest methane content contained in Suban Seam coal seam which is the most in the womb huminit greatest (92.6%) in the amount of 24.05 scf / ton.