GEOLOGY AND POTENTIAL OF COALBED METHANE (CBM) AT INTERVAL A – FG1 IN BENGALON AREA, KUTAI BASIN, KALIMANTAN TIMUR

• Main Author: Natanael Uli, Wira
• Format: Final Project
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/44188
• Institution: Institut Teknologi Bandung

Indonesia still relies on fossil energy to fulfill their energy needs. Domestic energy demand has increased beyond its production results. This is a challenge for Indonesia in the present and future. Coalbed Methane (CBM) is a non-conventional energy that can answer these challenges. CBM potential in Indonesia is very promising with total reserves reaching 453 Trillion cubic per Feet (TcF). The development of CBM in the Kutai Basin is supported by the abundance of wells and oil and well data in the area that can be used in CBM exploration. This research was conducted in the Bengalon area, Kutai Basin in the Balikpapan Formation. This study aims to determine the geological structure of the study area and determine the characteristics of the coal reservoir which includes the depositional environment and the distribution pattern of the coal reservoir by estimating the volume of coal and the methane gas content within the coal. The data used in this study are primary data obtained from the Multi Artha Vision Open Company which is conducting an exploration phase in the area, consisting of well data including wireline log data, description of core, laboratory data and geological cross section of the coal drill wells. Depositional environmental analysis of study area that was conducted form electro facies in wireline log data. The result correspond to the modern Mahakam Delta depositional mode. The model divides distributary channel facies associations into fluvial dominance which is characterized with thick clean sand and tidal dominance characterized by shale laminated sandstones. Coal rank in the study range from lignite-high volatile C bituminous and potential to produce biogenic type methane gas. Based on petrophysical analysis, coal proximate value, consist of density, moisture content, ash content at intervals without laboratory data can be estimated using proximate curve from the laboratory data regression equation that is supported by Kim’s equation which is modified by LAPI ITB according to the condition of research area. Model from proximate properties and gas content indicate the spread of coal methane gas reservoir distribution that follows the deposition direction of the study area relative eastward. Volumetric calculation results of the study area produced vole of coal reaching 1,687,937 acres and sum of methane gas volume reaching 190 BcF.