Purpose.To determine the nature of the effect of differenttype local structures as well as reservoir characteristics of enclosing rocks in the location of gas traps within the coal bearing deposits of PavlohradPetropavlivka and Krasnoarmiisk geological and industrial Donbas regions.Methodology. Analysis and classification of geological stock and published scientific sources. Developing and analyzing maps characterizing location of methane traps within coal bearing formation followed by the analysis of traps.findings. Connection between location of positive methane bearing anomalies and free methane content within coal seams, and local plicative structures has been identified. The anomalies are connected with structures of both anticlinal and synclinal types. Difference in reservoir characteristics of roof rocks of coal seams within areas under study makes it possible to believe that argillites and aleurites of Krasnoarmiisk district are almost impermeable. If they occur in roof of local folds, they will favour meth ane conservation. In the context of PavlohradPetropavlivka district, significant permeability of argillite and aleurites results in the fact that they cannot be a shield for folds; it concerns especially gentle folds where fractured zone is formed within arching. Rocks of upper share of a fold may become shield in local synclinal structures.originality. It has been proved for the first time that in the neighborhood of anticlinal local structures, synclinal local structures of coal seams may have methane accumulations if impermeable rocks are available within the synclinal roof.Practical value. The determined regularities will help to enhance prognostic reliability of methane accumulations within the coal deposits.
Приведены результаты исследования в лияния степени метаморфизма на видовой состав геодинамических явлений в угольных шахтах Франции. ВПЛИВ МЕТАМОРФІЗМУ ВУГІЛЛЯ НА ВИДОВИЙ СКЛАД ГЕОДИНАМІЧНИХ ЯВИЩ НА ПРИКЛАДІ ВУГІЛЬНИХ ШАХТ ФРАНЦІЇНаведено результати дослідження впливу ступені метаморфізму вугілля на видовий склад геодинамічних явищ у вугільних шахтах Франції.
The article considers the factors that contribute to the accumulation and preservation of methane in the coal seams of the Western Donbass. Mines of the district develop lower and middle carbon bituminous coal. It is characterized by a low degree of catagenetic transformations, increased collector properties. Regional regularities of change of methane bearing capacity of coal seams and content of free methane in them are established. In tectonic terms, the area is a monoclinal with domed and brachyform local structures associated with rupture. Methane-bearing anomalies, in turn, are associated with the vaults of such structures, both anticlinal and synclinal types. When bending into the anticlinal fold, the fracture of the rocks increases in the upper part of the formation, which increases their filtration rates. Roof rocks are characterized by high permeability and this leads to degassing of the anticline fold. During the formation of synclines, fractured zones are formed in the bottom of the coal seams and the screen for methane migration becomes directly the coal seam, which contributes to the preservation of methane in such structures. As a result, local synclines mostly have positive methane and free methane content and local anticline bends are mostly negative. It is established that the methane reservoirs in the study area are coal seams, argillites and siltstones with high reservoir properties, which are located in the vaults of plicative structures. The established patterns will improve reliability of the forecast of methane accumulations within coal deposits Keywords: methane bearing capacity, local folding, syncline structures, free methane, reservoir properties.
preDIctABIlIty of A sMAll-AMplItuDe DIsturBAnce of coAl seAMs In western DonBAs purpose. To identify development regularities of a smallamplitude disturbance in terms of typical Western Donbas mine fields and to define the most efficient tendencies of its prediction. Methodology. The methods include analysis, systematization, generalization, and statistical processing of geological and geo physical data; probability analysis. findings. Such parameters of smallamplitude breakings as amplitudes, slope angles, and length of the disturbances have been geometrized within the fields of Stepova and Yuvileina mines of Pershotravenske Mine Office (MO). The abovementioned helped to develop the statistical distribution of the values. Zonality of the smallamplitude disturbances of coal seams has been determined for the fields of the mines. Parameters of the zones are continuous, which made it possible to extrapolate them to the undisturbed shares of the mine fields. Statistical processing of the data, concerning characteristics of smallamplitude disturbances, became a basis for hypothesizing on the theoretical probabilistic distribution of the values, which helped to predict probable amplitude and length of disturbances within the undisturbed shares of the mine fields. Log data of expendable wells were used to support the prediction re sults. Caliper logging, showing tectonic disturbances, has been defined as the most informative log index in the context of geological conditions of Yuvileina mine. The log data confirm the prediction with the use of the disturbed area extrapolation. originality. It has been proved that the smallamplitude disturbances within mine fields of Pershotravenske MO form persistent areas demonstrated steadily in the log data. Among other things, logging is the most informative log index demonstrating tectonic disturbances for the geological conditions of Yuvileina mine. Such geometrical parameters of the disturbances as amplitude and length are subject to the exponential rule of the probability distribution, making it possible to predict the most possible values of the amounts where new stopes are planned for operation. The information concerning disturbance parameters of a coal seam helps to predict the complexity of mining of certain sites of a mine field. practical value. It has been identified that in terms of the fields of Pershotravenske MO, efficient prediction of smallamplitude disturbance of coal seams should involve the integration of geological (zone extrapolation) and geophysical (logging) methods. The analysis of log data of exploration wells within the areas where extrapolation recorded the highest probability of the small amplitude disturbance formation provides the early decisions as for the efficiency of the site mining to develop the required engi neering solutions, and to predict the coal grade deterioration.
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