Identifying Relationship Amongst Vitrinite/Inertinite Ratio (V/I), Cleat Parameters, Vitrinite Reflectance, O/C Ratio and Permeability of Coal Seams and V/I Ratio as Exploration Tool: Study from Raniganj Coal Bed Methane Block, Essar Oil Limited, India

2015 ◽  
pp. 205-217 ◽  
Author(s):  
Souvik Sen ◽  
Satabdi Banerjee
Keyword(s):  
Vitrinite Reflectance ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Coal Seams ◽  
Exploration Tool

scholarly journals Nano-mechanical Properties and Pore-Scale Characterization of Different Rank Coals

2019 ◽  
Vol 29 (3) ◽  
pp. 1787-1800 ◽  
Author(s):  
Yihuai Zhang ◽  
Maxim Lebedev ◽  
Gregory Smith ◽  
Yu Jing ◽  
Andreas Busch ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Vitrinite Reflectance ◽  
Chemical Properties ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Indentation Modulus ◽  
Micro Computed Tomography ◽  
Micro Structure ◽  
Nano Indentation

ABSTRACT Characterization of coal micro-structure and the associated rock mechanical properties are of key importance for coal seam exploration, coal bed methane development, enhanced coal bed methane production and CO2 storage in deep coal seams. Considerable knowledge exists about coal chemical properties, but less is known about the nanoscale to the micro-scale structure of coals and how they change with coal strength across coal ranks. Thus, in this study, 3D X-ray micro-computed tomography (with a voxel size of 3.43 µm) and nano-indentation tests were conducted on coal samples of different ranks from peat to anthracite. The micro-structure of peats showed a well-developed pore system with meso- and micro-pores. The meso-pores essentially disappear with increasing rank, whereas the micro-pores persist and then increase past the bituminous rank. The micro-fracture system develops past the peat stage and by sub-bituminous ranks and changes into larger and mature fracture systems at higher ranks. The nano-indentation modulus showed the increasing trend from low- to high-rank coal with a perfect linear relationship with vitrinite reflectance and is highly correlated with carbon content as expected.

Recovering coal bed methane from deep unmineable coal seams and carbon sequestration

2007 ◽  
Vol 29 (4) ◽  
pp. 474 ◽  
Author(s):  
Thomas D. Brown ◽  
Donald K. Harrison ◽  
J. Richard Jones ◽  
Kenneth A. LaSota
Keyword(s):  
Carbon Sequestration ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Coal Seams

Important Factors to Propose High-Produced New Development Wells in CBM Project

2014 ◽  
Vol 1030-1032 ◽  
pp. 2578-2581
Author(s):  
Zhao Hui Xia ◽  
Ming Zhang ◽  
Bin Ren ◽  
Liang Chao Qu ◽  
Ze Hong Cui ◽  
...  
Keyword(s):  
Coal Seam ◽  
3D Model ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Coal Seams ◽  
Reservoir Properties ◽  
Well Design ◽  
New Development ◽  
Reservoir Type ◽  
High Production

Coal bed methane (CBM) is a kind of natural gas that generated from coal and disseminated organic matters during the stage of diagenesis and coalification, which mainly composed of methane and hosted in coal seam by free, adsorbed, and dissolved forms. Genetic, reservoir type and occurrence condition in CBM are different from traditional reservoir. And the high-produced development wells in CBM aiming to drill more coal seams with high quality therefore needs to be analyzed in the methods that are different from traditional reservoir. 3 important factors including the study on correlation and elevation depth of coal seam roof and floor in section and areal by using well-seismic ties, outcrop boundary based on coal mine data and distributions of CBM reservoir properties in 3D model are needed for high-produced development well analyze in CBM. Application in Australia CBM project shows this methodology is very successful for the development well design with high production.

Factors facilitating or limiting the use of AVO for coal-bed methane

Geophysics ◽  
2006 ◽  
Vol 71 (4) ◽  
pp. C49-C56 ◽  
Author(s):  
Suping Peng ◽  
Huajing Chen ◽  
Ruizhao Yang ◽  
Yunfeng Gao ◽  
Xinping Chen
Keyword(s):  
Poisson’S Ratio ◽  
Poisson's Ratio ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Coal Seams ◽  
Amplitude Variation With Offset ◽  
Impedance Contrast ◽  
Reservoir Potential ◽  
Sweet Spots

There are similarities and differences in employing amplitude variation with offset (AVO) to explore for gas-sand reservoirs, as opposed to coal-bed methane (CBM) reservoirs. The main similarity is that large Poisson’s ratio contrasts, resulting in AVO gradient anomalies, are expected for both kinds of reservoirs. The main difference is that cleating and fracturing raise the Poisson’s ratio of a coal seam as it improves its reservoir potential for CBM, while gas always lowers the Poisson’s ratio of a sandstone reservoir. The top of gas sands usually has a negative AVO gradient, leading to a class one, two, or three anomaly depending on the impedance contrast with the overlying caprock. On the other hand, the top of a CBM reservoir has a positive AVO gradient, leading to a class four anomaly. Three environmental factors may limit the usage of AVO for CBM reservoirs: the smaller contrast in Poisson’s ratio between a CBM reservoir and its surrounding rock, variations in the caprock of a specific CBM reservoir, and the fact that CBM is not always free to collect at structurally high points in the reservoir. However, other factors work in favor of using AVO. The strikingly high reflection amplitude of coal improves signal/noise ratio and hence the reliability of AVO measurements. The relatively simple characteristics of AVO anomalies make them easy to interpret. Because faults are known to improve the quality of CBM reservoirs, faults accompanied by AVO anomalies would be especially convincing. A 3D-AVO example offered in this paper shows that AVO might be helpful to delineate methane-rich sweet spots within coal seams.

Application of Seismic Anisotropy Caused by Fissures in Coal Seams to the Detection of Coal-bed Methane Reservoirs

2010 ◽  
Vol 74 (2) ◽  
pp. 425-428 ◽  
Author(s):  
LIU Mei ◽  
GOU Jingwei ◽  
YU Guangming ◽  
LIN Jiandong
Keyword(s):  
Seismic Anisotropy ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Coal Seams

scholarly journals Aprovechamiento de metano en la cuenca carbonífera central asturiana: trabajos recientes The use of methane in the asturian central coal basin: recent work

2018 ◽  
Vol 36 (36) ◽  
pp. 81
Author(s):  
Noel Canto Toimil
Keyword(s):  
Recent Work ◽  
Coal Mining ◽  
20Th Century ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Coal Seams ◽  
Coal Basin ◽  
Mining Company ◽  
Hydrocarbon Deposits ◽  
Siglo Xx

Resumen: La explotacion de hidrocarburos no convencionales, entre ellos el del metano contenido en las capas de carbón (cbm: Coal Bed Methane), ha experimentado un gran auge en los últimos anos. La Cuenca Carbonífera Central Asturiana (ccca) ofrece un gran potencial para desarrollar proyectos de este tipo, como lo atestiguan las investigaciones y valoraciones llevadas a cabo en esta zona desde los años 90 del siglo xx. Hunosa, la empresa minera estatal que opera actualmente en la ccca, ha realizado una serie de investigaciones en los últimos años encaminadas al estudio de las posibilidades de desarrollar proyectos vinculados al aprovechamiento de metano del carbón, ya sea vam, amm, cmm o cbm. Los resultados obtenidos muestran que el cbm es el tipo de proyecto más adecuado actualmente para desarrollar en la ccca.Palabras clave: carbón, cbm, Cuenca Carbonífera Central Asturiana, hunosa, metano.Abstract: The exploitation of unconventional hydrocarbon deposits has increased in recent years. Methane from coal seams represents one of these gas resources. The Central Asturian Coalfield (cac) has a high potential to develop these types of projects, as many studies and research carried out since the 90’s (20th century) confirm. Hunosa, the stated-owned coal-mining company that currently operates in this area, has performed research for the last years focused on assessing the feasibility of developing projects related to methane exploitation: vam, amm, cmm and cbm. These studies have concluded that cbm projects would be the most adequate technique to be implemented in cac.Keywords: coal, cbm, Central Asturian Coalfield, hunosa, methane.

scholarly journals COAL BED METHANE POTENCYOF TANJUNG FORMATION IN TANAH BUMBU SOUTH KALIMANTAN

2010 ◽  
Vol 5 (2) ◽  
pp. 50-57
Author(s):  
David P Simatupang ◽  
Deddy Amarullah
Keyword(s):  
Coal Mine ◽  
Environmentally Friendly ◽  
Calorific Value ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Energy Sources ◽  
Gas Chromatograph ◽  
Coal Seams ◽  
Deep Coal Mine ◽  
Coal Deposits

Coal deposits distributes widely in Indonesia, mainly in Sumatera and Kalimantan. These deposits become an indication for a huge quantity of coal-bed methane (CBM) potency. As an environmentally friendly source of energy, CBM could be one of Indonesia's future energy sources. Centre for Geological Resources (CGR) started the exploration for this energy since 2005, while the study was conducted in 2008 at Tanjung Formation in Tanah Bumbu Area, South Kalimantan.CSAT-1 well was drilled to provide CBM resources and deep coal mine potency data for Tanjung Formation (Eocene) in Asem-asem Basin. This well went through 10 coal seams with three main seam, which is E seam at 212.34-213.30 m depth, I seam at 261.93-264.20 m, and J seam at 270.20-275.35 m depth. Calorific value from this three main seam categorized as high rank coal, vary from 6197-6745 cal/gram (adb), with total moisture between 4.51-7.11 %, adb.Total coal resources used for CBM resources quantification is 112,733,226 tons (between 300 to 1000 meters depth). Based on desorption test and gas chromatograph measurement from samples at various depth from three main seams, those coal gives methane resources estimation about 430 MSCF, with methane content vary between 1.2 - 6.6 cu-ft/ton of coal.

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