Properties and structure of hard coals from the borehole Niedobczyce IG-1 in Rybnik Coal District, Upper Silesian Coal Basin, their petrographic and group constituents. 1. Variations in properties of the coals along the depth of the borehole

摘要

Studies were made of the properties and structure of hard coals taken from the borehole Niedobczyce IG-1 in Rybnik Coal District (Upper Silesian Coal Basin) collected from a depth of up to 1830m. Coals occurring there vary from gas flame (611-Ⅶ)~2 to orthocoking (435-VB) types. Assessment of changes in quality and structure of the coals was based on the results of technical and elementary analyses, tests on coking properties and petrographic analysis. In the tested borehole the changes in the properties of coal take place in conformity with the Hilt rule [1] with the exception of the Michalkowice overthrust strata, occurring however, in a relatively narrow and shallowest zone of the borehole. An interpretation of the changes ascertained is formulated and certain relations between the properties and the structure of coal were established.