Abstract

 
 
 Taking into consideration the whole history of geological development of the Western Donbas, data on composition and grade of С12 series coal involved information about the geotectonic development of the Basin. To satisfy the objectives, a system of research methods, covering petrographic, computational, statistical, chronological, comparative and other methods, has been applied. In the process of identification of the petrographic composition and grade of series С12coal on the territory of the Prydniprovia Block, and determination of lateral regularities of their change as well as change in stratigraphic section of the Lower Carboniferous, data of petrographic as well as chemical and technological indices of the coal seam c1 were generalized along with data of all seams of С13 series. The activities helped define genetic features of series С12coal as well as stratigraphic and lateral regularities of changes in the coal composition. The differences in the petrographic composition as well as in the chemical and technological characteristics of series С12 and С13 are indicative of dissimilar conditions of formation of their peat depositions. It has been determined that compared with С13 series coal, the coal of С12 series contains more humidity and fewer mineral impurities. It is characterized by higher values of sulfur content, volatile-matter content, and combustion heat. The ultimate composition of coal seams of С12series is characterized by smaller values of carbon and oxygen contents as well as greater hydrogen content. The conclusions on common features and differences in the petrographic composition as well as chemical and technological features of coal seams of С12and С13 series, and regularities of their changes over the area of the seam occurrence was assessed.
 
 
Highlights
Expansion of coal seams over the whole multikilometer mass of the field, starting from the top of the Visean layers up to the Upper Carboniferous, is the feature of coal formation of the Donetsk Basin (Radziwill, 2012)
The data have helped draw conclusions on common features and differences in the petrographic composition as well as chemical and technological features of coal seams of С12 and С13 series, and regularities of their changes over the area of the seam occurrence and relying upon stratigraphic section. According to their petrographic composition, coal seams of С12 series belong to the spore durainclarain type: 1. It has been identified that in terms of the total petrographic composition, С12 series coal differs from С13 series coal
Lower series coal is characterized by a greater content of vitrain group and smaller amount of the inertinite and liptinite groups
Summary
Expansion of coal seams over the whole multikilometer mass of the field, starting from the top of the Visean layers up to the Upper Carboniferous, is the feature of coal formation of the Donetsk Basin (Radziwill, 2012). In terms of the Lower Carboniferous, the basic commercial seams are observed in С13 series. Due to their poor carbon bearing degree, the “subcoal” series of the Visean age (С12) belong to the least understood Donbas series. Petrographic as well as chemical and technological characteristics of coal seams of the Mezhova series were studied according to the certain wells while researching the basic carbon Samara series (С13). The lithological and facial characteristics of С12 series have been analyzed more thoroughly. It has been proved (Radziwill, 2012) that it is an independent rock complex differing greatly from carbon rocks of the underlying series (С11), and from the overlying carbon mass (С13). Carbonized bottom swampy-marine transgressive subformation underlies the carbon formation (Radziwill, 2012)
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