| 甘肃庆阳宁中矿区延安组主要成煤期岩相古地理和聚煤特征 |
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| 引用本文： | 曹大文,田秀荣,蒲丽君.甘肃庆阳宁中矿区延安组主要成煤期岩相古地理和聚煤特征[J].中国煤炭地质,2014(12):36-39. |
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| 作者姓名： | 曹大文 田秀荣 蒲丽君 |
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| 作者单位： | 甘肃煤炭地质勘查院;中煤地质工程总公司; |
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| 摘 要： | 宁中矿区地处鄂尔多斯盆地的西南缘,延安组1期为主要成煤期。运用典型钻孔剖面的测井曲线、岩性组合形态及大量钻孔含砂率等值线分析,研究了主要成煤期岩相古地理与聚煤特征。认为延安组I期沉积期矿区东部为湖泊、中西部为冲积成因洪泛平原沼泽的古地理面貌;主要可采煤层煤8层形成于曲流河侧向迁移和河道废弃后洪泛平原之上的沼泽环境,煤层西部厚度大,往东变薄直至尖灭,煤层硫分、灰分低。
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| 关 键 词： | 延安组 主要成煤期 岩相古地理 聚煤特征 宁中矿区 |
Main Coal-forming Stage Lithofacies,Paleogeography and Coal Accumulation Characteristics in Ningzhong Mine Area,Qingyang, Gansu |
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| Institution: | Cao Dawen, Tian Xiurong, Pu Lijun (1. Gansu Coal Geological Exploration Institute, Lanzhou, Gansu 730000; 2. China Coal Geological Engineering Corporation, Beijing 100040) |
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| Abstract: | The Ningzhong mine area is situated at the southwestern margin of Ordos Basin, the Yanan Formation member 1 is the main coal measures. Based on typical borehole logging traces, lithological assemblage pattern and large number of boreholes sand content isoline, studied main coal-forming stage lithofacies, paleogeography and coal-accumulation characteristics. The result considered that the paleogeography during Yanan Formation member 1 time mine area eastern part was lakes, middle and western parts were fluvial flood plain swamps. Main mineable coal No.8 was formed on meandering river lateral migration flood plain peat bog environment, the coal seam is thick in western part, thinning eastward up to pinch out, low sulfur and ash content. |
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| Keywords: | Yanan formation main coal-forming stage lithofacies paleogeography coal-accumulation characteristics |
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