冀西北中生代聚煤盆地含煤性差异的影响因素分析 |
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引用本文: | 尚洪田 薛少波. 冀西北中生代聚煤盆地含煤性差异的影响因素分析[J]. 中国煤炭地质, 2008, 20(3): 22-24 |
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作者姓名: | 尚洪田 薛少波 |
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作者单位: | 尚洪田(河北省煤田地质勘查院,河北,邢台,054000);薛少波(中国煤炭地质总局173队,河北,涿州,072750) |
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基金项目: | 本文承蒙李英超、杨广田、谢明忠高级工程师的指导,在此一并表示感谢. |
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摘 要: | 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。
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关 键 词: | 聚煤盆地 沉积特征 含煤性差异 影响因素 中生代 冀西北 |
文章编号: | 1674-1803(2008)03-0022-03 |
修稿时间: | 2007-12-19 |
Contributing Factor Analysis of Mesozoic Coal Accumulating Basin Coal-bearing Property Differentiae in Northwestern Hebei Province |
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Affiliation: | Shang Hongtian, Xue Shaobo (1. Hebei Provincial Coal Geological Exploration Institute, Xingtai, Hebei 054000; 2. No.173 Exploration Team, CNACG, Zhuozhou, Hebei 072750) |
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Abstract: | 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. |
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Keywords: | coal accumulating basin depositional characteristic coal-bearing property differentia contributing factor Mesozoic Era northwestern Hebei Province |
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