Determining the Gas Content of Coal Beds

2021 ◽  
Vol 64 (4) ◽  
pp. 144-147
Author(s):  
M. S. Plaksin ◽  
E. N. Kozyreva
Keyword(s):  
Gas Content ◽  
Coal Beds

scholarly journals Geochemical investigation of hydrocarbon generation potential of coal from Raniganj Basin, India

2021 ◽  
Vol 11 (10) ◽  
pp. 3627-3636
Author(s):  
D. S. Panwar ◽  
Ram Chandra Chaurasia ◽  
V. K. Saxena ◽  
A. K. Singh ◽  
Akanksha
Keyword(s):  
Gas Content ◽  
Coal Bed ◽  
Hydrocarbon Generation ◽  
Type Iii ◽  
Coal Beds ◽  
Petrographic Examination ◽  
Raniganj Coalfield ◽  
Geochemical Investigation ◽  
A Minor ◽  
Van Krevelen Diagram

AbstractMethane content in a coal seam is a necessary parameter for evaluating coal bed gas, and it poses an environmental risk to underground coal mining activities. Keeping in pace with comprehensive studies of coal bed gas, 12 coal samples were selected from the Sitarampur block of Raniganj Coalfield for analysis. The Petrographic examination illustrated that significant values of reactive macerals present in samples demonstrate that organic matter is dominated by the prominent source of aromatic hydrocarbons with a minor proportion of aliphatic hydrocarbon, which falls in the region of (Type III) kerogen, confirms the suitability for the potential of hydrocarbon generation. “A” factor (aliphatic/aromatic bands) and “C” factor (carbonyl/carboxyl bands) value concluded that the sample has the lowest aromaticity and the highest hydrocarbon-generating potential, which was also validated by the Van Krevelen diagram. The Van Krevelen diagram plots between the H/C and O/C ratio indicate that coal samples lie in the type III kerogen, and bituminous coal (gas prone zone) is present in the block, which is confirmed by the cross-plot between desorbed and total gas (cc/g). The in situ gas content values are high enough to produce methane from coal beds. The overall study concludes that the Sitarampur block from Raniganj Coalfield is suitable for hydrocarbon generation and extraction.

Research the Structural Feature of Jibei Mining Area to Control the Gas Bearing

2012 ◽  
Vol 260-261 ◽  
pp. 284-289
Author(s):  
Hai Yan Liu ◽  
Zeng Xue Li ◽  
Da Wei Lv ◽  
Dong Dong Wang ◽  
Wen Feng Ning
Keyword(s):  
Structural Feature ◽  
Mining Area ◽  
Gas Content ◽  
Coal Bed ◽  
Coal Production ◽  
Coal Beds ◽  
Wide Range ◽  
Local Areas ◽  
The One ◽  
Gas Bearing

The mining area of Jibei is an important coal production base, which located at the northern of Jining coalfield in Shandong province. The coal beds have the wide range of distribution and thicker sedimentary thickness in Shanxi Formation. The influence of structural feature to control the gas bearing in 3 coal bed is the paper’s important content. Two conclusions can be drawn from this study. The one is that open faults in whole area facilitate gasgascoal bed gas emitted from coal bed. The other is that closed faults in the local areas hinder gas emitted from coal bed. So, the laws are that the coal bed gas content and emission quantity are generally low in the whole mining area, but higher in parts area, and there are the abnormal gas zones at the special locations, where closed faults location.

scholarly journals Effect of the Hydrate Saturation of the Pores of Coal Bed on the Gradient of Gas Pressure and the Rise of Outburst Danger

2019 ◽  
Vol 105 ◽  
pp. 01044 ◽  
Author(s):  
Vyacheslav Smirnov ◽  
Valery Dyrdin ◽  
Tatyana Kim ◽  
Andrey Manakov
Keyword(s):  
Experimental Data ◽  
Marginal Zone ◽  
Pore Space ◽  
Gas Pressure ◽  
Gas Content ◽  
Coal Bed ◽  
Substantial Fraction ◽  
Coal Beds ◽  
Hydrate Saturation ◽  
Major Factors

A substantial fraction of methane in undisturbed coal beds is present in the condensed latent state, so that methane evolution from coal may be not always quantitatively predicted reliably. On the basis of experimental data, an equation expressing the amount of gas hydrate through the sorption capacity and actual humidity of coal is obtained. Analysis showed that the gradient of gas pressure in the marginal zone of a coal bed is linearly dependent on the saturation of the pore space with the hydrate. The high gradient of gas pressure and high gas content of coal beds along with local disruption of coal and re-distribution of rock pressure are the major factors causing instantaneous outbursts of coal and gas.

Workflow of Petrophysical Analysis Performed at Mine in Karaganda Coal Basin

2021 ◽  
Author(s):  
Makpal Bektybayeva ◽  
Nurhat Mendybaev ◽  
Asfandiyar Bigeldiyev ◽  
Subhro Basu ◽  
Auez Abetov ◽  
...  
Keyword(s):  
Soviet Union ◽  
Former Soviet Union ◽  
Coalbed Methane ◽  
Proximate Analysis ◽  
Ash Content ◽  
Gas Content ◽  
Coal Bed ◽  
Integrated Analysis ◽  
Coal Beds ◽  
Lithology Identification

Abstract For accurate coal bed methane (CBM) reserves estimation, it is necessary to evaluate reservoir characteristics. We present a workflow for formation evaluation of coalbed-methane wells, by interpretation of a limited number of legacy logs, including data preprocessing, lithology identification, proximate analysis and estimation of gas content of coal beds. This workflow allowed the estimation of ash content from the available logs, including selective log (analogue of photoelectric absorption), which was recorded only on the territory of the former Soviet Union and never used for such calculations before. Even though the logs were recorded by old tools with low vertical resolution, we were able to identify heterogeneity of coal seams, using the principle of core ash content distribution. Integrated analysis of old core data and recent laboratory measurements of samples from coal pillars allowed to calculate proximate properties of the coal, which showed good match with observed data and could be considered as input parameters for property distribution in the geological model. Also, it is worth to mention that an advanced plug-in was deployed to perform calculation of proximate properties and gas content for all available options and to significantly reduce time for screening different algorithms and rapidly analyzing results.

scholarly journals Petrophysical Investigation of Hydrocarbon Generation Potential of Coal from Raniganj Basin, India

2021 ◽  
Author(s):  
Deepak Singh Panwar ◽  
Ram Chandra Chaurasia ◽  
V K Saxena ◽  
A K Singh ◽  
Akanksha .
Keyword(s):  
Gas Content ◽  
Coal Bed ◽  
Hydrocarbon Generation ◽  
Type Iii ◽  
Coal Beds ◽  
Kerogen Type ◽  
Petrographic Examination ◽  
The Cross ◽  
Raniganj Coalfield

Abstract Methane content in a coal seam is a necessary parameter for evaluating coal bed gas, and it is a threat to underground coal mining activities from environmental aspects. Keeping in pace with comprehensive studies of coal bed gas, the authors had selected 12 coal samples from the Sitarampur block of Raniganj Coalfield. The Petrographic examination illustrated that significant values of reactive macerals present in samples demonstrate that organic matter is dominated by kerogen Type III, making it suitable for hydrocarbon generation. “A” factor (aliphatic/aromatic bands) and “C” factor (carbonyl/carboxyl bands) value concluded that the sample has the lowest aromaticity and the highest hydrocarbon-generating potential, which also validated by the cross plot between atomic H/C and O/C. The plots between the H/C and O/C ratio in the Van Krevelen diagram indicate that the coal samples lie in the type III kerogen, and bituminous coal (gas prone zone) is present in the block, which confirmed by the cross plot between desorbed and total gas (cc/g). The in-situ gas content values are high enough to produce methane from coal beds. The overall study concludes that the Sitarampur block from Raniganj Coalfield is suitable for hydrocarbon generation and extraction.

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