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| 鄂尔多斯盆地陇东地区延长组重力流沉积特征及其模式 | |
| 引用本文： | 廖纪佳,朱筱敏,邓秀芹,孙勃,惠潇.鄂尔多斯盆地陇东地区延长组重力流沉积特征及其模式[J].地学前缘,2013,20(2):29-39. |
| 作者姓名： | 廖纪佳 朱筱敏 邓秀芹 孙勃 惠潇 |
| 作者单位： | 1. 西南石油大学资源与环境学院,四川成都610500;中国石油大学(北京)地球科学学院,北京102249 2. 中国石油大学(北京)地球科学学院,北京102249;中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 3. 中国石油天然气股份公司长庆油田分公司研究院,陕西西安,710018 |
| 基金项目： | 国家重点基础研究发展计划"973"项目"中国西部叠合盆地深部油气复合成藏机制与富集规律"，国家重大专项"岩性地层油气藏沉积体系、储层形成机理与分布研究"项目专题，"大型油气田及煤层气开发"项目专题，油气资源与探测国家重点实验室资助项目 |
| 摘 要： | 利用岩心、测井资料和重力流沉积理论,系统研究了鄂尔多斯盆地陇东地区延长组重力流沉积特征及其沉积模式。该区重力流沉积物可分为浊积岩、砂质碎屑流沉积物、泥质碎屑流沉积物和滑塌岩。其中,浊积岩发育正粒序;砂质碎屑流沉积物以冻结块状沉积为特征;泥质碎屑流沉积物以泥质为主,内部含少量砂质颗粒和砂质团块;滑塌岩发育包卷层理等液化构造。不同重力流沉积物发育程度差异明显,浊积岩和砂质碎屑流沉积物的钻遇井数最多,泥质碎屑流沉积物最少。在重力流单期沉积厚度方面,砂质碎屑流沉积物单期沉积厚度平均为0.986m,明显高于其他类型;浊流沉积厚度最低,平均厚度为0.414m。本区重力流是由三角洲前缘沉积物失稳滑塌所致,砂质碎屑流沉积物和浊积岩是主要的重力流沉积类型,其次为滑塌岩和泥质碎屑流沉积物。砂质碎屑流沉积物主要发育于北东向曲流河三角洲前缘前方的深水区;浊积岩主要发育于西部、西南部和南部物源形成的辫状河三角洲前缘前方的深水区域;泥质碎屑流沉积物和富含泥砾砂质碎屑流沉积物在平面分布极少,且规律不明显。 |
| 关 键 词： | 鄂尔多斯盆地 延长组 重力流 沉积特征 沉积模式 |
Sedimentary characteristics and model of gravity flow in Triassic Yanchang Formation of Longdong Area in Ordos Basin |
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| LIAO Jijia,ZHU Xiaomin,DENG Xiuqin,SUN Bo,HUI Xiao.Sedimentary characteristics and model of gravity flow in Triassic Yanchang Formation of Longdong Area in Ordos Basin[J].Earth Science Frontiers,2013,20(2):29-39. | |
| Authors: | LIAO Jijia ZHU Xiaomin DENG Xiuqin SUN Bo HUI Xiao |
| Institution: | 1.Institute of Resources and Environment,Southwest Petroleum University,Chengdu 610500,China 2.College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China 3.State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China 4.Research Institute of Changqing Oilfield,PetroChina,Xi’an 710018,China |
| Abstract: | Sedimentary characteristics and depositional model of Yanchang Formation of Longdong area in Ordos Basin were studied based on core,logging data and gravity flow theory.The gravity flow deposits of the area can be divided into turbidite,sandy debris flow sediment,muddy debris flow sediment and slump rock.The turbidite develops positive grading.The sandy debris flow sediment is characterized by freezing and massive deposition.The muddy debris flow sediment mainly contains muddy and a small number of sandy particles and clumps in its interior.The slump rock develops liquefied tectonic structure,such as convolute bedding.The differences of the development degree of gravity flow sediments are obvious.In terms of the number of drilling wells,the turbidite and sandy debris flow sediment are the major sedimentary types,and the muddy debris flow sediment is the less one.In terms of the single deposition thickness of gravity flow,the average thickness of sandy debris flow deposition is 0.986 m,which is significantly higher than other types.The average deposition thickness of turbidite is the lowest,which is 0.414 m.The gravity flow of the area is due to the slump of delta front sediments.The sandy debris flow sediment and turbidite are the main types of gravity flow deposits,followed by the slump rock and muddy debris flow sediment.The sandy debris flow sediment developed in deep-water area in front of the north-east delta front from meandering river.The turbidite mainly developed in deep-water area in front of the braided river delta front,whose provenance came from west,southwest and south.In terms of distribution area,the muddy debris-flow sediment and sandy debris flow sediment with mud gravel are very small in plane,and their distribution is not in a regular pattern. |
| Keywords: | Ordos Basin Yanchang Formation gravity flow sedimentary characteristics depositional model |
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