内蒙古自治区准格尔煤田老三沟井田地层研究新认识
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摘要
针对前人关于老三沟井田9~#煤层以下基岩为中奥陶统马家沟组(O_2m)灰岩的认识,本文依据勘探阶段大量的三维地震资料,结合勘探阶段钻孔综合地质成果资料及沉积古地理相图,对该井田地层重新进行了划分和研究,提出新认识:本井田缺失中奥陶统马家沟组(O_2m)地层,各地层单位由老至新依次是中太古界乌拉山群(ArW)、寒武系上统炒米店组(∈3c)、上寒武-下奥陶系三山子组(∈3～O_1s)、石炭系上统太原组(C_2t)、二叠系下统山西组(P_1s)、二叠系中下统石盒子组(P_(1-2)sh)、二叠系上统孙家沟组(P_2sj)、白垩系下统罗汉洞组(K_1lh)、新近系上新统(N_2)、第四系上更新统马兰组(Qp_3m)及全新统(Qh)松散堆积层。对该地层研究的新认识,将为该井田后续开采利用提供更加准确的地质依据。
In view of the previous understanding that the bedrock below No.9 coal seam in Laosangou mine field was the limestone of middle Ordovician Majiagou formation(O_2m), based on three-dimensional seismic data and combined with the comprehensive geological results of drilling in the exploration stage, the author reclassified and studied the strata of this mine field, and put forward a new understanding that the middle Ordovician Majiagou formation(O_2m) was missing in this mine field, and the stratigraphic units from old to new were middle Archean Wulashan group(ArW), upper Cambrian Chaomidian formation(∈_3c), upper Cambrian-lower Ordovician Sanshanzi formation(∈_3～O_1s), upper Carboniferous Taiyuan formation(C_2t), lower Permian Shanxi formation(P_1s), Permian system in the middle and lower stone box set(P_(1-2)sh), upper Permian Sunjiagou formation(P_2sj), lower Cretaceous Luohandong formation(K_1lh), Neogene Poliocene(N_2), Quaternary Pliocene Malan formation(Qp_3m) and Holocene(Qh) loose deposits. Based on the new understanding, the study of strata will provide accurate geological basis for the subsequent exploitation and utilization of this mine field.
In view of the previous understanding that the bedrock below No.9 coal seam in Laosangou mine field was the limestone of middle Ordovician Majiagou formation(O_2m), based on three-dimensional seismic data and combined with the comprehensive geological results of drilling in the exploration stage, the author reclassified and studied the strata of this mine field, and put forward a new understanding that the middle Ordovician Majiagou formation(O_2m) was missing in this mine field, and the stratigraphic units from old to new were middle Archean Wulashan group(ArW), upper Cambrian Chaomidian formation(∈_3c), upper Cambrian-lower Ordovician Sanshanzi formation(∈_3～O_1s), upper Carboniferous Taiyuan formation(C_2t), lower Permian Shanxi formation(P_1s), Permian system in the middle and lower stone box set(P_(1-2)sh), upper Permian Sunjiagou formation(P_2sj), lower Cretaceous Luohandong formation(K_1lh), Neogene Poliocene(N_2), Quaternary Pliocene Malan formation(Qp_3m) and Holocene(Qh) loose deposits. Based on the new understanding, the study of strata will provide accurate geological basis for the subsequent exploitation and utilization of this mine field.
引文
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[3] 袁伟,梁官考,魏善捷等.内蒙古自治区准格尔煤田老三沟井田煤炭勘探报告[R].内蒙古呼和浩特:内蒙古地质工程有限责任公司,2015
[4] 景新道.内蒙古自治区准格尔煤田老三沟井田煤炭勘探项目三维地震勘探报告[R].山西晋城:山西省地球物理化学勘查院,2015
[5] 吴子武.内蒙准格尔煤田地质特征[J].煤田地质与勘探,1981(5)
[6] 张春林,张福东,朱秋影等.鄂尔多斯克拉通盆地寒武纪古构造与岩相古地理再认识[J].石油与天然气地质,2017(2)
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[9] 武军.内蒙古自治区准格尔煤田北部岩浆岩赋存状况及岩性特征[J].内蒙古石油化工,2010(9)
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