Laboratory investigation of coal characteristics from Tikak Parbat formation of North-East India for coal bed methane st
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ORIGINAL PAPER-EXPLORATION GEOLOGY
Laboratory investigation of coal characteristics from Tikak Parbat formation of North‑East India for coal bed methane study Prasun Banik1 Received: 7 February 2020 / Accepted: 28 July 2020 / Published online: 9 August 2020 © The Author(s) 2020
Abstract The increasing demand for cleaner source of energy forces India to explore various energy sources, and in this process, coal bed methane gas attracts lot of attention for its favourable characteristics including abundance of coal, clean gas, mitigation of greenhouse gases, reduction in hazard in mines, etc. However, the challenge faced during exploration and production varies from depth of seam, heterogeneity in coal characteristics, rank, sorption capacity, saturation, etc. So the detail analysis of various properties is important for economical extraction of gas. The present paper investigates coal properties and their influence on coal bed methane potentiality. Samples from core wells have been analysed in laboratory using proximate and ultimate analyser. Linear correlations between coal constituents and vitrinite reflectance as well as sorption capacity of coal have been established statistically. Mutual relations among proximate parameters are developed. Keywords Coal bed methane · Proximate analysis · Ultimate analysis · Vitrinite reflectance · Gas content
Introduction Fossil fuel coal and natural gas have the largest share in the energy mix internationally. Traditionally, coal has been used as a fuel in industries that has proven abundance regionally. Switching from coal to natural gas for power generation would benefit the environment by producing less air pollutant and greenhouse gas emissions (Chabukdhara and Singh 2016). Coals in its matrix have entrapped methane gas, and this trapped methane gas has been found to be a promising alternative cleaner source of fossil fuel. This leads to extraction of methane gas from coal known as coal bed methane (CBM) for commercial utilization. CBM and natural gas both contain 95% of pure methane (Rice 1993; Levine 1993). Its heating value is approximately 8500 Kcal/kg compared to 9000 Kcal/kg of natural gas (Ojha et al, 2011). In total, 33 CBM blocks have been awarded in four rounds of CBM bidding till date, out of which one block, namely AS-CBM-2008/IV, in North-East India has been awarded for exploration of CBM gas. According to Director General
* Prasun Banik [email protected] 1
Department of Petroleum Engineering, DUIET, Dibrugarh University, Dibrugarh 786004, India
of Hydrocarbons, India, prognosticated CBM resources in North-East India are 8.5 billion cubic meter. Assessment of CBM potentiality requires complete knowledge on characteristics of coal and its variation. This investigation reports proximate and ultimate parameters of coal samples collected from core holes drilled in the block and inferred vitrinite reflectance (Ro (%)) and sorption capacity (cc/g) of coal using empirical relations. The correlation of different proximate parameters with vitrinite reflecta
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