On the Distribution of Sandbody Controlled by Sedimentary Facies and Its Water Enrichment Law:A Case Study of the 2nd Member of Yan'an Formation in Wenjiapo Mine Field
In order to provide theoretical basis for mine water hazard prevention and control,the internal relationships between sedimentary facies,sandbody distribution and water enrichment law are revealed from sedimentology.Taking the 2ndmember of Yan'an formation in Wenjiapo Coal Mine Field as the research object,this paper studies the sandbody distribution which is controlled by sedimentary facies and water enrichment law by using geological data such as logging,seismic and hydrology.Results show that lacustrine and meander river delta deposits are mainly developed in the 2nd member of Yan'an formation,and four main sandbodies are identified:branch channel,subaqueous branch channel,mouth bar,and beach bar.The spatial distribution of sandbodies is obviously controlled by sedimentary facies.The branch channel sandbodies in northeast and the subaqueous branch channel sandbodies in central and southern of the study area are the key areas of water enrichment nomaly with large thickness,coarse grain size and high porosity,the prevention and control of mine water hazard should be strengthened in later mining process of 4#coal seam.
sedimentary faciessandbody distributionwater-enrichmentthe 2nd member of Yan'an formationWenjiapo Coal Mine Field
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