scholarly journals Coal and coalbed-methane resources in the Appalachian and Black Warrior basins: maps showing the distribution of coal fields, coal beds, and coalbed-methane fields

2014 ◽  
Author(s):  
Michael H. Trippi ◽  
Leslie F. Ruppert ◽  
Robert C. Milici ◽  
Scott A. Kinney
Keyword(s):  
Coalbed Methane ◽  
Coal Beds ◽  
Coal Fields

scholarly journals III.—On the Lower Carboniferous Rocks of North Wales

1867 ◽  
Vol 4 (31) ◽  
pp. 11-13
Author(s):  
A. H. Green
Keyword(s):  
Short Stay ◽  
Lower Carboniferous ◽  
Red Sandstone ◽  
Coal Beds ◽  
North Wales ◽  
Rough Approximation ◽  
Full Solution ◽  
The Individual ◽  
Coal Fields

It is well known that, though the Coal Fields of Lancashire and North Wales are now parted from one another at the surface by a broad tract of New Red Sandstone, there is reason to believe that the two are connected underground, and are bothparts of one and the same great deposit; and that the beds which in Lancashire and Cheshire dip out of sight below the Redmeasures, reappear in Flintshire and Denbighshire. Attempts have been made, I believe, to identify the individual coal-beds of the two districts, but I do not know with what success. During a short stay at Llangollen, some years ago, I venturedon a like task for the Lower Carboniferous Rocks, and though the time at my disposal allowed of only scanty observations, these were recorded in my note-book, in hopes that an opportunity might occur of filling in the sketch thus roughly tracedout. No such chance has befallen, or seems likely to befall me, and in the hope that the notes I then made may aid some one who, with more leisure, is willing to attempt a full solution of this problem, I now put them forward as a rough approximation.

scholarly journals III.—On the Plant Remains from the Brazilian Coal Beds, with Remarks on the Genus Flemingites

1869 ◽  
Vol 6 (58) ◽  
pp. 151-156 ◽  
Author(s):  
W. Carruthers
Keyword(s):  
Rio Grande ◽  
Rio Grande Do Sul ◽  
Additional Material ◽  
Coal Beds ◽  
Secondary Formation ◽  
Plant Remains ◽  
Coal Measures ◽  
Coal Fields

The specimens placed in my hands by Mr. N. Plant from Rio Grande do Sul consist of a few specimens of coal and a considerable number of a highly ferruginous shale. The coal contains no recognizable fossils, but they abound in the shale. The substance of the plants is converted into a brittle coal, that possesses no structure, and exhibits the form only of the organism, but the superficial structure and the venation is often so beautifully preserved on the surface of the shale, when the coal is removed, that the nature of the fossils is very clearly exhibited. I have, thus, been able to determine with precision three species, and to recognise more vaguely a number of other forms, which, however, it would be injudicious, until additional material is obtained, to name or describe from the specimens in my possession. All these forms, as far as they can be determined, and certainly the three well-preserved species, belong to Palseozoio genera, species of which occur in the Coal-measures of Britain. We are thus enabled with certainty to refer the Coal-fields of the province of Rio Grande do Sul to the Carboniferous period, although the coal itself has more the aspect of being the product of a Secondary formation.

Research on Main Control Factors of Coalbed Methane Reservoir Formation in Turpan-Hami Basin

2011 ◽  
Vol 233-235 ◽  
pp. 2201-2204 ◽  
Author(s):  
Gui Zhong Li ◽  
Hong Yan Xu ◽  
Bo Wang ◽  
Ze Deng ◽  
Meng Geng
Keyword(s):  
Coalbed Methane ◽  
Structural Evolution ◽  
Coal Bed ◽  
Coal Rank ◽  
Hydrogeological Condition ◽  
Gas Reservoirs ◽  
Coal Resources ◽  
Coal Beds ◽  
Control Factors ◽  
Coalbed Methane Reservoir

Turpan-Hami Basin is a typical low coal rank coal bearing basin in China, with coal resources accounting for 50% of the total low coal rank resources. Structural evolution of the basin plays important controlling roles to generation；Fan delta and braided delta deposit systems are thick and stable sedimentary systems which are favorable for coal beds development；Hydrogeological condition is a major force for the adjustment and construction of coal-bed gas reservoirs.

scholarly journals Correcting Hole Enlargement Impacts on Density Logs for Coalbed Methane Reservoirs

2015 ◽  
Vol 8 (1) ◽  
pp. 72-77 ◽  
Author(s):  
Zhidi Liu ◽  
Jingzhou Zhao
Keyword(s):  
Relative Density ◽  
Coalbed Methane ◽  
Ordos Basin ◽  
Geometric Factor ◽  
Gas Field ◽  
Response Characteristics ◽  
Coal Beds ◽  
Internal Relation ◽  
Fitting Method ◽  
Coal Rock

Density logging is an effective method in the evaluation of coalbed methane (CBM) reservoirs. Whether density log values effectively represent true density of coal will directly determine precision of evaluating coalbed methane parameter logs. In this paper, a statistical method is used to analyze density log response characteristics and hole enlargement rate for three main coal beds in the study area in order to determine the internal relation between hole enlargement rate and density response. Analytical results show that distortion of density log response values is caused mainly by hole enlargement impacts. Based on the apparent geometric factor theory, a model suitable for correcting hole enlargement impacts density logs for coalbed methane reservoirs has been deduced. To correct density logs for hole enlargement influences, it is key to determine a mud apparent geometric factor. Using measured apparent relative density, density log values and caliper logs for coal rock, the least squares fitting method was adopted to obtain computation model constants for the mud apparent geometric factor applicable to the study area. When this model was applied in a computer autocorrecting process for evaluating enlargement impacts on density logs for coalbed methane reservoirs of the Hancheng gas field in the eastern section of Ordos Basin, China, the correction results were very close to measured relative density, indicating that this method can improve precision of correcting hole enlargement impacts on density logs.

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 II.—The Brazilian Coal Fields

1869 ◽  
Vol 6 (58) ◽  
pp. 147-150 ◽  
Author(s):  
Nathaniel Plant ◽  
W. Carruthers
Keyword(s):  
South America ◽  
Rio Grande ◽  
Rio Grande Do Sul ◽  
Coal Beds ◽  
Coal Fields

The presence of Coal-beds in South America has been known for several years, but the only localities on this side between the Amazon and the River Plate where their existence has been actually determined, are in the two extreme southern provinces of Brazil, Rio Grande do Sul, and in the adjoining one of Santa Catherina, and in the neighbouring Republic of Banda Oriental or Uruguay.

Alaskan Coal Fields

1921 ◽  
Vol 3 (3supp) ◽  
pp. 285-286
Author(s):  
George Watkin Evans
Keyword(s):  
Coal Fields
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