Analysis of coal accumulation characteristics during the two major coal forming periods in Tongchuan area
Tongchuan area is located in the central part of Shaanxi Province with a geological area on the southern edge of the Ordos Basin.In order to promote the high efficient utilization of coal resource and strengthen the role of geological tech-nology in safety,the coal accumulation characteristics and structure in the two major coal forming periods are studied.Through analysis of the characteristics and coal accumulation law of major coal-bearing strata,the author has concluded that coal seams of No.2,3,4,5,6,10 and 11 were formed in Carboniferous Permian,while No.5 and 10 are available for large-area mining;the sedimentary of No.1,2,3 and 4 coal seams was occurred in Jurassic period,while No.4 coal seam is suit-able for large-area mining.It is believed that the occurrence of the two coal seams is closely related to the basin basement.The early Carboniferous Permian coal seams deposited in the eastern part of the basin,after a long Triassic period,the west-ern part of Tongchuan area was still a basin environment with the sedimentary of Jurassic coal seams.
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