冀西北中生代聚煤盆地含煤性差异的影响因素分析

冀西北（张家口）地区发育了一系列中生代聚煤盆地，盆地类型分为断陷型聚煤盆地和坳陷型聚煤盆地，含煤地层时代从早中侏罗世到早白垩世。在总结含煤盆地沉积特征基础上，对造成聚煤盆地含煤性差异的影响因素进行分析，认为盆地基底地层岩性的不同，构成了不同的古地理景观，对聚煤作用有很重要影响；聚煤盆地的规模及展布受古构造控制，影响煤层的聚集规模；沉积环境差异导致聚煤条件的差异，影响煤层聚集的范围和厚度；煤系地层粗、细碎屑岩的赋存比例反映盆地沉降速率的高低，从而影响盆地含煤性。其中聚煤古构造是影响各聚煤盆地含煤性差异的主导因素。

Contributing Factor Analysis of Mesozoic Coal Accumulating Basin Coal-bearing Property Differentiae in Northwestern Hebei Province

A series of Mesozoic coal basins have developed in northwestern Hebei （Zhangjiakou） area. Fault and down-warped coal basins can be divided, stratigraphic time of coal basins is from Early-Middle Jurassic to Early Cretaceous. Based on coal basin depositional characteristics, analyzed contributing factors caused coal-bearing property differentiae. The authors considered that different basement rock composed different paleogeographic landscape and has important impact to coal accumulation processes; scope and distribution of coal basins were controlled by paleostructures that bore upon coal accumulation dimensions; different depositional environment caused different coal accumulation conditions, and influenced coal accumulation extent and thickness; coarse and fine clastic rock ratios in coal measures reflected basin subsiding velocity and sequentially influenced on basin coalbearing property. In which, paleostructure is the dominant factor to influence coal-bearing property differentiae in each coal basin.