| On the basis of systematic analysis of the structure characteristics and development law of the 16# and 18# coal seam macro and micro deformation characteristics analysis and the judgment of the type of coal body structure of drilling well logging curve,and combine the Analysis of regional tectonic characteristics and its evolution, and discussed the development, distribution characteristics and tectonic control of the structure coal mine. Analyzed the pore structure characteristics of different types of structural coal through the experimental tests of mercury intrusion in typical tectonic coal samples. Based on the analysis of gas content in coal seam, discussed the characteristics of gas occurrence and its influencing factors in depth. Achieved the following main results and understanding.(1)Qinglong mine coal bearing strata has been experienced three stages of tectonic since the formation mainly, includes Indosinian period, Yanshan period and Himalaya period. During the Indosinian period, the directions of the major tectonic stress are NS and form the EW fold, and under the continuous extrusion, a series of reverse faults are formed. Yanshan stage form the mine strucrure grid under the NW-SE extrusion tectonic movement, and develop the NE-SW trending reverse faults and folds. At the same time, change the transformation of the Indosinian EW structure and makes the structure line to a certain deflection.The most prominent feature of Himalaya stage NE-SW extrusion effect is that the NE trending faults in Yanshan are transformed into normal faults.(2)The development of the structure coal is much intense and common Through the analysis of the characteristics of macro and micro deformation of coal, and divede the structure into cataclastic coal, porphy roclastic coal, granulated coal, flake coal, squamate coal, wrinkly coal and mylonitized coal 7 types. Through the 16# and 18# coal seams are classified into three types, I type-primary structure coal, class II- and class III strong deformation and structural coal by logging curves. type I-the primary structure of coal, type II- cataclastic coal and type III- porphy roclastic coal, granulated coal, flake coal, squamate coal, wrinkly coal and mylonitized coal. Recognite the structure of 16# and 18# coal seam and the thickness of layer and layer through well logging, and analyze the distribution law of structural coal. Finally analyze the effects of different types and different types of structures on the development of structural coal deeply.(3)By means of constructing coal sample pressure mercury test Analyse pore structure of coal, different types of tectonic evolution and pore structure morphology and pore connectivity characteristics, and discuss the intrinsic relationship between the structure of the coal and the pore structure.(4)Deeply discussed the geological factors which affecting the distribution of coal and gas heterogeneity in the Qinglong coal mine. Through the analysis of the structure of the mine, the lithology of the coal seam roof, the buried depth of the coal seam, the degree of coal metamorphism, the composition of the coal and the hydrogeological conditions. Finally, conclude that the structure of the mine is the main control factor of the heterogeneity distribution of gas. |
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