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| 鄂尔多斯盆地祁连海域奥陶纪岩相古地理特征及演化 | |
| 引用本文： | 韩品龙,张月巧,冯乔,高建荣,张曼莎,王红艳.鄂尔多斯盆地祁连海域奥陶纪岩相古地理特征及演化[J].现代地质,2009,23(5). |
| 作者姓名： | 韩品龙 张月巧 冯乔 高建荣 张曼莎 王红艳 |
| 作者单位： | 1. 西北大学,地质学系,陕西,西安,710029;中国石油勘探开发研究院,北京,100083 2. 中国石油勘探开发研究院,北京,100083 3. 山东科技大学,地质科学与工程学院,山东,青岛,266510 |
| 基金项目： | 国家基础研究发展计划项目，中国石油与天然气总公司重大专项"海相碳酸盐岩大油气田勘探开发关键技术" |
| 摘 要： | 根据鄂尔多斯盆地西部及南部奥陶纪露头勘察结果,尤其是中奥陶统平凉组页岩在盆地的西部及南部普遍存在,结合地表露头及盆内钻孔资料,系统分析研究了鄂尔多斯盆地祁连海域早古生代奥陶纪不同时期沉积环境特点,分析了各沉积期的岩相古地理特征。受中央古隆起形成和祁连海向东逐渐海侵影响,马家沟组一期到五期,地形坡度较缓,鄂尔多斯盆地古地理格局由祁连海向盆地内部分别发育开阔海台地、局限海台地到蒸发台地相沉积。马家沟组六期和平凉期以及其上的上奥陶统沉积时期,主要为开阔海台地、斜坡相和深水盆地相沉积,在台地向斜坡的转换部位发育一些生物碎屑灰岩及由珊瑚组成的生物礁滩相沉积,斜坡部位发育平凉组笔石页岩斜坡相沉积,构成了华北盆地边缘中—上奥陶统一套特殊的局部天然气勘探组合。鄂尔多斯祁连海域奥陶纪岩相古地理研究具有重要的地质意义和实际生产意义。 |
| 关 键 词： | 鄂尔多斯盆地 岩相古地理 祁连海 奥陶纪 斜坡相 |
Petrofacies Palaeogeography and Evolution of Ordovician of Qilian Sea Area in Ordos Basin |
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| HAN Pin-long,ZHANG Yue-qiao,FENG Qiao,GAO Jian-rong,ZHANG Man-sha,WANG Hong-yan.Petrofacies Palaeogeography and Evolution of Ordovician of Qilian Sea Area in Ordos Basin[J].Geoscience——Journal of Graduate School,China University of Geosciences,2009,23(5). | |
| Authors: | HAN Pin-long ZHANG Yue-qiao FENG Qiao GAO Jian-rong ZHANG Man-sha WANG Hong-yan |
| Abstract: | Based on the investigation results of outcrop, especially considering the universal existence of Pingliang Formation shale in western and southern Ordos Basin, combined with the outcrop and well information, this paper systemically studies the sedimentary environment of Qilian Sea of Ordos Basin in Early Paleozoic Ordovician, and lithofacies palaeogeography of every sedimentary period is reconstructed. Affected by the formation of the central paleo up-lift and Qilian Sea's invading gradually toward east, the lithofacies paleogeographic framework of Ordos Basin totally showed that open-sea platform, limited sea platform and evaporating platforms were successively distributed during Majiagou age 1, Majiagou age 2 and Majiagou age 3. During Majiagou age 4 and Majiagou age 5, shallow-water carbonate facies, especially edge slope facies and shoal reef facies, were developed and they will be the potential reservoirs. During Majiagou age 6 and Pingliang age, the maximum regression occurred, and open-sea facies and deep-sea basin facies were developed. The graptolite shale of Pingliang Formation is good source rock. The study of the lithofacies paleogeography of Ordovician in Ordos Basin has important significances in both geological theory and production. |
| Keywords: | Ordos Basin lithofacies palaeogeography Qilian Sea Ordovician period slope facies |
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