Study on feature of coal body structure and logging response in Jincheng Mining Area

The coalbody structure would be an important factor affected to coalbed methane development effect and an accurate evaluation of the coalbody structure would be a key issue of the study on the coalbed methane exploration and development. According to the coal breaking degree and based on the coal failure type division plan stipulated in Regulations on Coal and Gas Outburst Prevention,the coalbody structure was divided to a completed structure,a block breaking structure,a broken struct ure,broken partical structure and mylonite structure.The first two structures would be primary structure coal and late three structures would be structure coal.Based ona ty pical mine in Jincheng Mining Area at the south part of Qinshui Basin as an object,the paper analyzed the logging response features of different coal structure.The study sh owed that with coal broken degree increased,well diameter, acoustic time difference ,compensated neutron,natural potential value and natural gamma response would steadi ly increased and electrical resistivity and density response would be steadily reduced.The natural gamma,natural potential value , compensated neutron,well diameter and a coustic time difference response of the primary structure coal were quite weak,the electrical resistivity and density response would be quite high and the structural coal wa s on the contrary.