甘肃省周寨南勘查区岩煤层对比

Comparison of rock and coal seams of southern Zhouzhai exploration area in Gansu Province

周寨南勘查区构造中等偏复杂,见煤层数多,煤层有分叉突变现象,岩煤层对比非常困难。通过分析该区煤层赋存特征,解决煤层发育部位和对比框架后,确定煤4层底板油页岩和煤5组底板灰褐色砂质泥岩中可见似鲕状结构作为标志层,运用地震时间剖面中发育3组反射波、地球物理测井曲线图中煤层物性特征不同等对比方法,结合邻区资料,对该区岩煤层进行精细对比,确定了可采煤层空间位置。结果表明,主要可采煤层煤3组、煤5组煤层地震反射波明显,标志层明显,为较稳定的可采煤层,地质勘查成果为该区进行下一步工作提供了理论依据。

In southern Zhouzhai exploration area,the structure is medium to complex,there are many coal seams,the coal seams have bifurcation and mutation phenomenon,and the correlation of rock and coal seam is very difficult.Based on the analysis of the occurrence characteristics of coal seams in this area,after solving the development position and correlation framework of coal seams,it is proposed to take the oolitic structure in No.4 coal seam floor oil shale and No.5 coal seam floor gray brown sandy mudstone as the marker bed.By using three groups of reflected waves developed in seismic time section and different physical characteristics of coal seam in geophysical logging curve,combined with the data of adjacent area,the detailed comparison of rock and coal seam in this area is carried out,and the spatial position of minable coal seams is determined.The results show that the seismic reflection wave of the No.3 coal seam group and No.5 coal seam group of the main minable coal seam is obvious,and the marker layer is clear,which is stable and minable coal seam.The results of geological exploration provide a theoretical basis for the next work in this area.