Coal structure identified based on logging curve

In order to identify the coal structure, the coal structure at Northeastern Hegang Coalfield was divided into A type ( primary structure coal, broken coal) a nd B type ( structure coal) . The paper summarized the density in the logging curve, deep lateral resistivity, acoustic transit time, well diameter, natural gamma, gamma- gamma and other curve affected to the loggings of different coal structures. In comparison with A type coal, the well diameter and acoustic transit time were increased, t he deep lateral resistivity, the density and the gamma-gamma of the B type coal would be reduced and the natural gamma and neutron porosity would be different by th e area to area.With the summarization on the structure features of different coal, the paper had an analysis on different coal structure correspondence to the response V alue scope of the logging curve and then based on the logging response and the logging curve diagram, the coal structure of study area was divided. The structure coal percentage of No.9 seam and No. 15 seam obtained from the study area would be 40% and 50%individually and the structure coal development of No.11 seam would be all higher than 30%.