| 吉尔嘎郎图凹陷赛汉塔拉组沉积特征与超厚煤层异地成因分析 |
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| 引用本文： | 吴昕,吴冲龙,毛小平,张继吟.吉尔嘎郎图凹陷赛汉塔拉组沉积特征与超厚煤层异地成因分析[J].沉积学报,2016,34(6):1155-1164. |
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| 作者姓名： | 吴昕 吴冲龙 毛小平 张继吟 |
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| 作者单位： | 1.中国地质大学(武汉) 武汉 430074; |
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| 基金项目： | 华北油田管理局研究项目(WX20070301),中国地质调查项目(1212011220096)[North China Petroleum Administration Bureau Research Project |
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| 摘 要： | 吉尔嘎郎图凹陷的赛汉塔拉组沉积于基底减速沉降-充填演化阶段,是凹陷进入湖泊萎缩阶段早-中期的产物,其层序地层单元属于水退体系域。自下而上由浅湖相、三角洲相和曲流河相组成。其中的超厚煤层与大量薄层浊积砂岩共生,形成于该凹陷的次级深断槽中,沉积环境应为浅湖和局部较深湖。传统的煤沉积模式难以解释其超厚煤层的成因。通过对煤层和夹矸的沉积学研究,以及凹陷充填序列分析,建立了一种陆相超厚煤层异地成因新模式--“弱风暴及水下泥质、砂质重力流亚模式”,简称为胜利盆地亚模式。推测成煤物质是由远源河流搬运而来的巨量异地高灰泥炭,可能先沉积于滨湖三角洲,后经滑塌和浊流作用转移至浅湖中,并经再次分异、沉积成为超厚的低灰煤层。
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| 关 键 词： | 超厚煤层 异地煤 煤层成因 二次堆积 煤沉积模式 吉尔嘎郎图凹陷 |
| 收稿时间： | 2016-07-25 |
Analysis on Sedimentary Characteristics and Allochthonous Genesis of Extra-thick Seam in Jiergalangtu Depression,Saihantala Formation |
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| WU Xin,WU ChongLong,MAO XiaoPing,ZHANG JiYin.Analysis on Sedimentary Characteristics and Allochthonous Genesis of Extra-thick Seam in Jiergalangtu Depression,Saihantala Formation[J].Acta Sedimentologica Sinica,2016,34(6):1155-1164. |
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| Authors: | WU Xin WU ChongLong MAO XiaoPing ZHANG JiYin |
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| Institution: | 1.China University of Geosciences(Wuhan), Wuhan, 430074, China;2.Chengyi University College, Jimei University, Xiamen, Fujian 361021, China;3.China University of Geosciences(Beijing), Beijing, 100083, China |
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| Abstract: | The Saihantala Formation of Jiergalangtu depression deposited in basement subsidence deceleration-filling evolution stage. It was the product of the depresion in the early and middle stage of the lake's shrinking-stage. Its sequence stratigraphic units are parts of resgressive system tract. From bottom to top, it consists of shallow lacustrine facies, delta facies and meandering river facies. The extra-thick coal seam formed in the deep groove of the depression and symbiosed with a lot of thin layers of turbidity sandstone, its sedimentary environment should have been shallow lake and local deep lake.Traditional coal depositional model can hardly explain the cause of this extra-thick coal seam. Through the sedimentological study of gangue and the analysis of basin-fill sequence, a new model of extra-thick seam continental allochthonous genesis-"sub model of weak storms and underwater muddy and sandy gravity flow"-is established, abbreviated as Shengli basin sub model. The allochthonous coal may have deposited firstly in lake delta, and then transferred to shallow lake by slumping and turbidity, and after secondary differentiation, finally deposited as low ash coal seam. |
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| Keywords: | extra-thick coal seam allochthonous coal coal seam genetic secondary accumulation coal depositional models Jiergalangtu depression |
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