新疆大南湖煤田三号井田标志层研究建立与应用

Establishment and Application of Marker Layer Research in No.3 Well Field of Dananhu Coalfield,Xinjiang

新疆大南湖煤田含煤地层为中侏罗统西山窑组,含煤特征是煤层层数多,区域变数较大,稳定性较差。为统一井田内煤层序号、名称,精确控制钻孔终孔层位,在前人工作基础上,对新疆大南湖煤田三号井田地层、沉积环境及聚煤规律、构造、火烧区、煤层等进行分析,从岩层标志层、煤层标志层、煤层间距标志层、物性标志层4个方面进行标志层研究与建立。合理利用标志层特征,对开展不同地质条件煤层对比、判定煤层名称、判定断层位置及落差、指导钻机生产等具重要意义。

The coal-bearing strata of the Dananhu coalfield in Xinjiang are the Xishanyao Formation of the Middle Ju-rassic.The coal-bearing characteristics are that there are many layers of coal seams,large regional variables and poor sta-bility.The predecessors have carried out multi-phase geological exploration work and obtained a large number of geolog-ical data in the No.3 well field of the Dananhu Coalfield,but there are still problems such as wrong coal seam number,inconsistent coal seam naming in the east and west of the well field,and incorrect final hole horizon.In order to unify the serial number and name of coal seams in the mine field,and accurately control the final borehole horizon,this paper,on the basis of previous work,analyzes the strata,sedimentary environment,coal-accumulation law,structure,burning area,and coal quality of coal seams in the No.3 mine field of the Dananhu coalfield in Xinjiang,and studies and establishes the marker layer from four aspects:strata marker layer,coal seam quality marker layer,coal seam spacing marker layer,and physical property marker layer,The application examples are listed.The reasonable use of the characteristics of each marker layer is important for the comparison of coal seams with different geological conditions,the determination of the name of coal seams,the determination of fault location and fall,and the guidance of drilling rig production.The research and establishment of the marker bed is of great significance to the No.3 well field of the Dananhu coalfield in Xinjiang,which has poor stability of coal seams.