Abstract:
China’s traditional mining areas in Jixi and Qitaihe in the eastern part of Heilongjiang Province are experiencing accelerated depletion of shallow resources. The concealed coal of the Paleogene in Yonghe Village, Hulin Basin, serves as a core resource for the energy succession strategy in Northeast China. However, issues such as low exploration degree and unclear coal control mechanisms are restricting its development and utilization. This study takes the concealed coal resources in Yonghe Village as the research object, integrates the latest geological work research results, constructs a tectonic framework through geological interpretation, and systematically analyzes the coal-controlling mechanisms and builds a coal accumulation model by combining sedimentary facies analysis, the relationship between paleoclimate parameters and tectonic subsidence rate simulation. The research results show that the study area is a large coal resource mine, with the minable coal seam buried at a moderate depth, and the coal quality is suitable for multiple scenarios such as power generation and gasification. For the first time, this study proposes a ternary coupling coal-controlling model of “tectonics-sedimentation-paleoclimate”, clarifying that the optimal coal accumulation occurs when the tectonic subsidence rate is 0.1-0.3 mm/a, the annual average paleoclimate temperature is 15-20 ℃, and the superimposed thickness of shallow lake facies-lake marsh facies is ≥15 m. This model has significantly improved the success rate of predicting concealed coal resources of the same type. This study has broken through the technical bottleneck of concealed coal exploration in loose layer-covered areas, and provides resource support and technical paradigm for the construction of the Northeast Energy Succession Base.