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.

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.

Seismic studies of coal bed methane content in the west coal mining area of Qinshui Basin

2013 ◽  
Vol 23 (6) ◽  
pp. 795-803 ◽  
Author(s):  
Guangui Zou ◽  
Suping Peng ◽  
Caiyun Yin ◽  
Yanyong Xu ◽  
Fengying Chen ◽  
...  
Keyword(s):  
Coal Mining ◽  
Mining Area ◽  
Methane Content ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
The West ◽  
Qinshui Basin ◽  
Coal Mining Area

scholarly journals A Sequential Approach for Integrated Coal and Gas Mining of Closely-Spaced Outburst Coal Seams: Results from a Case Study Including Mine Safety Improvements and Greenhouse Gas Reductions

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3023 ◽  
Author(s):  
Liang Cheng ◽  
Zhaolong Ge ◽  
Jiufu Chen ◽  
Hao Ding ◽  
Lishuang Zou ◽  
...  
Keyword(s):  
Coal Mining ◽  
Mine Safety ◽  
Coal Bed ◽  
Gas Extraction ◽  
Coal Seams ◽  
Sequential Approach ◽  
Coal Mine Safety ◽  
Working Face ◽  
Protective Seam

Closely-spaced outburst coal seams (COCS) is the main condition of coal seams in southwest China, and gas disasters are one of the major problems affecting coal mine safety. Mining a protective seam and pre gas extraction are the most safety way to improve the efficiency of mining under these conditions. However, low pre-mining gas extraction efficiency coupled with the close proximity of adjacent working faces is a problem. When mining at an old working face has been completed but the new working face is not yet ready to be mined, coal-bed gasses can flow into the new working face from adjacent seams and this commonly causes methane monitoring instruments to sound an alarm. These gas extraction difficulties lead to a conflict between mine safety and profit. To solve these problems, a sequential approach for integrated coal and gas mining of closely-spaced outburst coal seams is introduced in this paper. Two fundamental principles are proposed: (1) Fully coordinating the spatiotemporal relationships between gas extraction, roadway development, and coal mining to maximize both mine safety and coal and gas production; (2) Defining a mining sequence for outburst coal seams and choosing the coal seam with the weakest outburst risk as the protective seam. A system for comprehensive gas extraction in underground coal mines is divided into four stages for gas extraction: gas extraction before coal roadway tunneling, gas extraction before coal mining, gas extraction during coal mining, and gas extraction from the goaf after coal mining. The Songzao mining area, China, is used as a case study to demonstrate the effectiveness of this model, and it brings three major benefits: it improves underground coal mine safety with physical gas accidents decreased by 66.8%, it makes underground coal-bed methane (CBM) extraction more efficient with the average gas extraction rate were respectively 45.13 m3/t and 62.4%, the highest in China, and it reduces greenhouse gas emissions equivalent to 3.5 million tonnes of carbon dioxide. This study could be used as a valuable example for other coal deposits being mined under similar geological conditions.

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