宁武煤田朔南矿区5、6号煤层沉积环境及对比研究

Depositional Environment and Correlation of Nos.5 and 6 Coal Seams in Shuonan Mining Area,Ningwu Coalfield

宁武煤田朔南矿区5号、6号煤层位于太原组上段,5号煤厚0～3.20m,6号煤厚0～2.94m,均属局部可采煤层,在实际工作中往往难以区分对比。通过对矿区含煤地层及煤层顶板砂岩K2、K3、K4沉积环境的研究,认为5号煤层形成于三角洲水下分流河道之间的泛滥盆地,6号煤层形成于三角洲前缘河口砂坝基础上发育的潮坪环境,属于三角洲平原水下沉积体系的两个不同旋回。运用岩性标志,物性参数及煤质特征可有效区分5、6号煤层,并进行追踪对比,为进一步勘探和煤矿开采提供了资料。

The Nos.5 and 6 coal seams in Shuonan mining area, Ningwu coalfield are in the upper member of Taiyuan Formation, No.5 coal seam 0-3.20m, No.6 0-2.94m thick, all partial mineable, practically hard to correlate sometimes. Through sedimentary environment studies on coal-bearing strata and coal seam roof sandstone K2, K3 and K4 considered that No.5 coal seam was formed in delta underwater interdistributary flood basin, No.6 coal seam in tidal fiat environment developed on basis of delta front channel-mouth bar, they are belong to two different cycles of delta plain underwater depositional system. Lithological criteria, physical parameters and coal quality characteristics application can differentiate No.5 and No.6 coal seams effectively and then carry out tracing and correlation can provide useful data for further exploration and coal mining.