山西朔南矿区石炭—二叠系含煤性及影响因素分析

Permo-Carboniferous Coal-bearing Property and Impacting Factor Analysis in Shuonan Mining Area,Shanxi

朔南矿区位于宁武煤田北端，主要含煤地层为石炭系太原组和二叠系山西组，区内煤层总厚度大、赋存稳定，总体呈北东方向展布，厚度自中部向南北两侧加厚，含煤性最好的部位位于本区西北部，煤层总厚多在30m以上，含煤系数在22％以上。最高达34．5％，中部含煤性较差，煤层总厚度一般为20～26m，含煤系数14％-18％。根据太原组和山西组厚度、含煤性特征以及构造、沉积环境的研究，认为该区沉积体系大体经过了渴湖-三角洲-三角洲水上分流河道、分流间湾-内陆冲积平原的演变，煤层厚度在横向及纵向上的变化与沉积相带展布方向相吻合，富煤带位于本区西北部的古斜坡地带，表明含煤性明显受古构造古地理的控制，厚煤区古地理背景具有长期的稳定性。

The Shuonan mining area is situated at the north end of the Ningwu coalfield. Main coal-bearing strata belong to Carboniferous Taiynan Formation and Permian Shanxi Formation. Coal seams in the area has characteristics of large total thickness, steady hosted, and presents NE extending as a whole. Coal thickness is increasing both southward and northward. The coal-beating property best part is in the northwest of the area, with total thickness over 30m largely, coal-bearing coefficient above 22%, maximum 34.5%; coal-bearing property in the middle is relatively poor, with total thickness 20~26m generally, coal-bearing coefficient 14%- 18%. Based on thickness, coal-bearing characteristic, structural and sedimentary environmental studies of the Taiyuan and Shanxi formations, have considered that： in principle, the sedimentary system in the area has experienced an evolution of lagoon-delta- deltaic distributary channel, interdistributory bay-inland alluvial plain. Lateral and vertical variations of coal seam thicknesses are tally with sedimentary facies zone extending directions; coal-rich zone is situated on the fossil clinoform zone in northwest of the area. It has demonstrated that the coal-bearing property is controlled by paleostructure and paleogeography; the paleogeographic setting of coal thick zone should have long term stability.