崔家沟煤矿三维地震勘探法探测薄煤无煤带实践

Practice of three-dimensional seismic exploration in thin coal zone and no coal zone in Cuijiagou coal mine

崔家沟煤矿主要可采煤层为4-2煤,其上发育了一系列的北东和北西—北西西向的褶皱构造,这些褶曲大多对称出现,向斜煤厚,背斜煤薄规律明显,背斜两翼倾角大小控制着煤层厚度变薄速度。为准确勘测薄煤无煤带位置,采用三维地震勘探煤层反射波T0控制4-2煤起伏形态,通过煤层反射波振幅变化预测4-2煤厚度变化,根据这2个特点圈定了崔家沟煤矿三盘区由基底引起的薄煤无煤带范围。经过井下巷道揭露和定向钻验证了三维地震解释的薄煤无煤带范围,证明了该方法在黄陇侏罗纪煤田基底控煤和煤厚变化快的地区的有效性,为三盘区后续工作面布设和巷道掘进提供了有效的地质依据。

The main minable coal seam of Cuijiagou coal mine is 4-2 coal seam,which develops a series of NE and NW-NWW fold structures,and most of these folds appear symmetrically,the coal seam at the syncline is thick,the coal seam at the anticline is thin,and the inclination angle of both wings of anticline controls the thinning speed of coal seam thickness.In order to accurately survey the location of thin coal zone and no coal zone,three-dimensional seismic method is used to detect the reflection wave T0 of coal seam to control the fluctuation of 4-2 coal seam,and the change of 4-2 coal seam thickness is predicted by the amplitude change of reflection wave of coal seam.Finally,the scope of thin coal zone and no coal zone caused by the basement in the third panel of Cuijiagou coal mine is delineated.Through underground roadway exposure and directional drilling verification,it is proved that the scope of thin coal zone and no coal zone interpreted by 3D seismic method is accurate,which shows the effectiveness of this method in the area where the basement coal control and coal thickness change rapidly in Huanglong Jurassic coalfield,and provides effective geological basis for the follow-up working face layout and roadway excavation in the third panel area.