淮北孙疃煤矿下石盒子组主采煤层沉积环境与聚煤特征

Xiashihezi Formation Main Mineable Coal Seam Sedimentary Environment and Coal Accumulation Features in Suntuan Coalmine,Huaibei

下石盒子组煤层作为淮北孙疃煤矿主要的开采对象,其煤层变化受沉积环境影响较大。根据钻孔岩心、测井、矿井地质、岩石薄片等资料,分析研究区下石盒子组主采煤层含煤岩段的沉积环境,并对聚煤特征进行研究。结果表明研究区下石盒子组主要形成于浅水三角洲平原沉积环境,受海水与河流的共同作用,发育有分流河道、分流间湾、天然堤、泛滥盆地、泥炭沼泽等沉积微相。其中分流河道废弃阶段以及分流间湾的聚煤作用较好,为下石盒子组主要的聚煤环境。

As a main exploitation object, Xiashihezi Formation coal seam variation in the Suntuan coalmine has subjected impact from sedimentary environment greatly. Based on borehole core, well logging, coalmine geological and rock thin section data, have analyzed Xiashihezi Formation main mineable coal seam coal- bearing sector sedimentary environment and coal accumulation features. The re- sult has shown that in the study area, Xiashihezi Formation had been formed in a shallow water delta plain, subjected interaction from both sea water and rivers, developed microfacies of distributary channels, interdistributory bay, levee, flood basin and peat bog etc. In which, during the distributary channel abandonment stage and in interdistributory bay have better coal accumulation, thus the main coal accumulation environment during the Xiashihezi age.