Results of implementation of mechanical logging for additional investigation of the geological structure of the Olon-Shibirskoe coal deposit

Abstract

Mining coal requires detailed geological information about the structure of the coal seam and the quality of coal seams that allows to minimize the risks associated with the complicating mining and geological factors and changes in the quality characteristics of coal. The article discusses the experience of applying the mechanical logging method as an express method of operational exploration in the Olon-Shibirsk coal deposit. The mechanical logging data were compared with core sampling data and geophysical well surveys. As a result, criteria for dividing the coalbearing sequence of the deposit into lithotypes were identified. According to these criteria, it is possible to identify a general pattern for the considered coal seam: drilling speed increases with decreasing grain size, drilling speed also increases with increasing the content of organic matter in the rock, the maximum drilling speed is characterized by coal seams. The drilling speed is the determining parameter, while the other drilling parameters complement its readings in case of ambiguity in the interpretation of the graph. For coal seams, the dependence of drilling speed on ash content was determined. At the same time, the dependence is most correct for coal seams with thickness more than one meter. On the basis of operational exploration data using mechanical logging for some areas, the morphology of coal seams, as well as the complexity of their structure and ash content, which allowed to specify the reserves and quality by geological blocks. In the final comparison with the fact was confirmed an increase in the accuracy of calculations using the method of mechanical logging. Practical significance of the results of the study is to improve the quality of operational exploration in the field while reducing costs.