| 鄂尔多斯盆地南部三叠系延长组湖相重力流沉积细粒岩及其油气地质意义 |
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| 引用本文： | 杨仁超,尹伟,樊爱萍,韩作振.鄂尔多斯盆地南部三叠系延长组湖相重力流沉积细粒岩及其油气地质意义[J].古地理学报,2017,19(5):791-806. |
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| 作者姓名： | 杨仁超 尹伟 樊爱萍 韩作振 |
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| 作者单位： | 1. 山东省沉积成矿作用与沉积矿产重点实验室,山东科技大学地球科学与工程学院,山东青岛 266590;
2. 海洋国家实验室,海洋矿产资源评价与探测技术功能实验室,山东青岛 266071;
3. 中国石化石油勘探开发研究院, 北京 100083;
4.Geocom Consultants,Valle del Portet 17,03726 Benitachell,Spain |
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| 基金项目： | Co-funded by the National Natural Science Foundation of China: Depositional Mechanisms of the Late Triassic Hyperpycnites in the Southern Ordos Basin (No.41372135) and Sedimentary Features and Depositional Processes of Muddy Gravity￣flows Deposits in the Yanchang Formation in the Southern Ordos Basin (No.40872024), and Shandong University of Science and Technology Research Fund (No.2015TDJH101) |
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| 摘 要： | 随着页岩油气勘探开发和相关领域研究的不断深入,细粒沉积物的搬运和沉积已成为当前沉积学研究的热点问题之一,但中国中生代湖泊环境中的泥质重力流沉积尚未引起应有的关注。通过岩心观察、薄片鉴定等手段及综合研究,分析了鄂尔多斯盆地晚三叠世湖相泥质重力流沉积特征,探讨了其形成机制与成因分类。鄂尔多斯盆地三叠系延长组湖相泥页岩结构类型多样,发育泥质块体流沉积、泥质碎屑流沉积、泥质浊流沉积和泥质异重流沉积等多种重力流沉积类型。按照泥质含量将重力流划分为砂质重力流、泥质重力流和混合重力流3种亚类,并根据成因将重力流划分为滑塌体、碎屑流、浊流及异重流等4种亚类;结合成因和泥质含量,将重力流沉积共划分为12种类型。滑塌岩、碎屑岩分布于三角洲前缘斜坡脚附近;浊积岩、异重岩广泛分布于三角洲斜坡至沉积中心。认为泥质沉积物可以在强水动力条件下搬运-沉积;重力流沉积细粒物质在湖相沉积中占据很大的比例;泥质重力流对泥页岩中的碎屑物质、黏土矿物及有机质的搬运和沉积起到重要作用,因而对于页岩油气的生烃、储集性能和压裂工艺研究具有重要意义。
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| 关 键 词： | 重力流 细粒沉积 泥质碎屑岩 泥质浊积岩 泥质异重岩 非常规油气 鄂尔多斯盆地 延长组 |
| 收稿时间： | 08 October 2016 |
Fine-grained,lacustrine gravity-flow deposits and their hydrocarbon significance in the Triassic Yanchang Formation in southern Ordos Basin |
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| Yang Renchao,Yin Wei,Fan Aiping,Han Zuozhen,A. J.van Loon.Fine-grained,lacustrine gravity-flow deposits and their hydrocarbon significance in the Triassic Yanchang Formation in southern Ordos Basin[J].Journal of Palaeogeography,2017,19(5):791-806. |
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| Authors: | Yang Renchao Yin Wei Fan Aiping Han Zuozhen A Jvan Loon |
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| Institution: | 1.Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals, College of Earth Science and Engineering, Shandong University of Science and Technology,Qingdao 266590,Shandong;2.Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266071,Shandong;3.Petroleum Exploration &Production Research Institute, SINOPEC, Beijing 100083;4.Geocom Consultants,Valle del Portet 17,03726 Benitachell,Spain |
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| Abstract: | With deepening research on the development of shale oil and gas development and related fields,transportation and deposition of fine-grained sediments have been a significant area of research in the stratigraphic community. However,muddy gravity￣flow deposits in the Mesozoic lacustrine environment in China have received little attentions. Based on core examinations,thin section identifications and comprehensive analysis,current study investigate sedimentary features of muddy gravity￣flow deposits in the Late Triassic southern Ordos Basin,and discuss their genesis and classifications. Various types of lacustrine mudstones or shales were recognized in the Yanchang Formation in the southern Ordos Basin,including muddy slumps,muddy debris flows,muddy turbidity currents and muddy hyperpycnal flows. Gravity￣flow deposits are classified into three types, namely sandy gravity￣flow deposits,muddy gravity￣flow deposits and hybrid gravity￣flow deposits. Based on mud contents and gravity flows’ originations, four types of slumps,debris flows,turbidity currents and hyperpycnal flows were inferred. And then they are classified into 12 types based on origination and mud content. Slumps and debrites mainly occur near to toe slope of delta fronts, while turbidites and hyperpycnites are well developed in large extent from delta slopes to basin plains. It is considered that (1) mud can be transported and deposited by active hydrodynamics; (2) fine-grained deposits created by gravity flows take a high percentage in lacustrine mudstones and shales; (3) muddy gravity flows are significant in transportations and depositions of clastic particles,clay minerals and organic matters, and are thus of great significance to hydrocarbon generating,reservoir capability and research on fracturing to unconventional oil and gas. |
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| Keywords: | gravity flow fine-grained deposits muddy debrite muddy turbidite muddy hyperpycnite unconventional oil and gas Ordos Basin Yanchang Formation |
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