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| 陇东地区上三叠统延长组早中期物源分析与沉积体系 | |
| 引用本文： | 郭艳琴,李文厚,胡友洲,庞日轩,张宝平.陇东地区上三叠统延长组早中期物源分析与沉积体系[J].煤田地质与勘探,2006,34(1):1-4. |
| 作者姓名： | 郭艳琴 李文厚 胡友洲 庞日轩 张宝平 |
| 作者单位： | 1. 西北大学地质系,陕西,西安,710069 2. 长庆油田分公司第一采油厂,陕西,延安,716000 3. 陕西地球物理地球化学勘查院,陕西,周至,710400 |
| 摘 要： | 利用轻重矿物组合特征、古水流方向、砂岩岩石学特征、水下分流河道砂体空间展布及沉积构造特征等,对鄂尔多斯盆地陇东地区上三叠统延长组长8-长6油层组母岩类型、物源方向以及沉积体系进行研究。古流向参数表明,延长组沉积时期,沉积物从盆地边部向中心搬运。根据轻重矿物组合划分出3个主要物源方向,即西、西南和东北方向。此外,根据古流向判断有南部的次要物源。母岩是盆地周缘的前寒武系石英岩、中基性、中酸性火山岩、变质岩和古生界的浅变质岩、碳酸盐岩和砂砾岩。陇东地区上三叠统延长组长8-长6油层组沉积体系划分为:北东向吴旗-华池三角洲沉积体系和西部环县扇三角洲沉积体系,西南部镇原-泾川辫状河三角洲沉积体系和南部合水-固城川浊积扇沉积体系。在沉积体系划分的基础上,详细阐述了不同沉积体系的岩石学特征、砂体形态和沉积构造及各沉积体系的演化过程。 |
| 关 键 词： | 鄂尔多斯盆地 上三叠统延长组 古流向 物源分析 沉积体系 陇东地区 |
| 文章编号： | 1001-1986（2006）01-0001-04 |
| 收稿时间： | 2005-03-22 |
| 修稿时间： | 2005年3月22日 |
Source analysis and depositional systems of Upper Triassic early and mid-term Yanchang Formation in Longdong area |
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| GUO Yan-qin,LI Wen-hou,HU You-zhou,PANG Ri-xuan,ZHANG Bao-ping.Source analysis and depositional systems of Upper Triassic early and mid-term Yanchang Formation in Longdong area[J].Coal Geology & Exploration,2006,34(1):1-4. | |
| Authors: | GUO Yan-qin LI Wen-hou HU You-zhou PANG Ri-xuan ZHANG Bao-ping |
| Abstract: | Light and heavy mineral combination characteristic,directions of palaeo-flow,sandstone petrography,space distribution of sand bodies of subaquatic distributary channels and sedimentary structure feature were used to analyze source rock,source direction and depositional system of Chang 8-6 oil-beds of Yanchang Formation of the Upper Triassic in Longdong area of Ordos Basin.The palaeo-flow parameters show that the sediments are carried from department by the basin to the center in the depositional period of Yanchang Formation.Three main source directions can be divided according to the light and heavy mineral combination characteristics,as west,southwest and northeastern directions.In addition,there is the secondary source in the south according to ancient flow direction.The quartzite,neutral-basic and neutral-acid volcanic rock,metamorphic rock of Precambrian and shallow metamorphic rock,carbonate rock,gravel rock of Palaeozoic group from basin outer edge are the source rocks.The depositional system of Chang86 oil-beds of Yanchang Formation of the Upper Triassic in Longdong area can be divided into four systems.One of them is Wuqi-Huachi delta depositional system from northeast;others are Huanxian fan delta depositional system from west,Zhenyuan-Jingchuan braided delta depositional system from southwest and Heshui-Guchengchuan turbidite fan depositional system from south.On the basis of the depositional systems,petrographic characteristics,sand body pattern,sedimentary structure of different depositional systems and the evolution process of the depositional systems are elaborated in detail. |
| Keywords: | Ordos Basin Upper Triassic Yanchang Formation palaeo-flow direction source analysis depositional system Longdong area |
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