| 陕西榆林——横山地区侏罗纪坳陷湖泊的淤浅机制和聚煤作用 |
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| 引用本文： | 李智民.陕西榆林——横山地区侏罗纪坳陷湖泊的淤浅机制和聚煤作用[J].陕西地质,1991(2). |
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| 作者姓名： | 李智民 |
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| 作者单位： | 陕西省地质矿产局第八地质队 |
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| 基金项目： | 地矿部“七、五”重点科技攻关项目《鄂尔多斯盆地煤聚集规律及与油气的成因联系》下属的二级课题《鄂尔多斯盆地陕西榆林、横山至内蒙古乌审旗一带侏罗纪煤聚集规律及资源评价》 |
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| 摘 要： | 榆林—横山地区是鄂尔多斯盆地侏罗纪煤田的一个重要组成部分。延安组内含有极其丰富的优质煤。煤的聚集和大型内陆坳陷湖盆的充填有密切的关系。本文以大比例尺写实断面研究成果论述了研究区内沉积体系域三维空间配置关系,为环境分析和聚煤模式的建立提供了充足的沉积学依据。对内陆坳陷湖泊充填淤浅及泥炭沼泽的形成机制进行了探讨。依据实际资料分析,笔者将区内的聚煤活动归结为三种模式:即(1)废弃河流环境聚煤;(2)废弃三角洲平原聚煤;(3)湖湾决口充填聚煤。第二种是研究区内最重要,也是规模最大的聚煤型式;第三种所形成煤层质量最好,是今后在该区寻找优质富煤带,满足从质量上优中选优的方向。
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| 关 键 词： | 鄂尔多斯盆地 内陆坳陷湖盆 浅水碎屑湖泊 沉积体系域 聚煤模式 |
THE SHALLOWING MECHANISM AND THE COAL-ACCUMUL-ATION IN THE DEPRESSION LAKE OF THE JURASSIC PERIOD IN THE YULIN-HENGSHAN AREA OF SHAANXI PROVINCE |
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| Li Zhimin.THE SHALLOWING MECHANISM AND THE COAL-ACCUMUL-ATION IN THE DEPRESSION LAKE OF THE JURASSIC PERIOD IN THE YULIN-HENGSHAN AREA OF SHAANXI PROVINCE[J].Geology of Shaanxi,1991(2). |
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| Authors: | Li Zhimin |
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| Institution: | The Geological Team No.8 of the Shaanxi Bureau of Geology and Mineral Resources |
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| Abstract: | The Yulin-Hengshan area is a dominant component part of the Jurassic coal fields of the Ordos basin.The Yan'an Formation in the area contains very abundant high-quality coal.The accumulation of coal is closely related with the infilling large-scale inland depression lakes. In terms of the section studies,the paper discussed the distributional relat- ions in three-dimensional space of the depositional system in this researched area,thus providing a reliable sedimentary basis for environmental analysis and setting up the coal accumulation model.The writer also discussed the formational mechanism of the inland depression-lake infilling and peaty marshs.According to the analysis of practical information,the writer summed up and classified the coal accumulation in the researched area into three models:1)the coal-accumulation in slouphed river environment;2)the coal-accumulation in the slouphed delta plain;3)infilling coal-accumulation in the laeostrine bays.The second,however,is most important,which range is largest in this area.The third formed coal with the best quality,which is also a coal-rich belt. |
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| Keywords: | Ordos basin Inland depression lake basin Infilling lake with deberis Depositional system Coal-accumulation model |
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