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陆相湖盆重力流混合事件层沉积及其地质意义
投稿时间:2020-09-01  修订日期:2020-10-19  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2021066
摘要点击次数: 61
全文下载次数: 91
作者单位地址
杨 田 油气藏地质及开发工程国家重点实验室成都理工大学 成都市成华区二仙桥东三路1号
操应长 中国石油大学华东地球科学与技术学院
中国石油大学华东地球科学与技术学院 
田景春 油气藏地质及开发工程国家重点实验室成都理工大学 
李士祥 中国石油长庆油田公司勘探开发研究院 
周新平 中国石油长庆油田公司勘探开发研究院 
金杰华 中国石油大学华东地球科学与技术学院
中国石油大学华东地球科学与技术学院 
张倚安 油气藏地质及开发工程国家重点实验室成都理工大学 
中文摘要:重力流混合事件层在陆相湖盆广泛发育,其形成和分布对理解重力流沉积演化过程及重力流沉积常规与非常规油气勘探开发意义重大。以涠西南凹陷流沙港组一段和鄂尔多斯盆地延长组7段重力流沉积为研究对象,分析湖盆重力流混合事件层的沉积特征、类型、成因及沉积模式,并进一步探讨其地质意义。湖盆主要发育滑动、滑塌重力驱动块体搬运沉积和砂质碎屑流、泥质碎屑流、高密度浊流和低密度浊流等重力流流体沉积,同时广泛发育重力流混合事件层沉积。湖盆重力流混合事件层包含多层结构、双层结构和频繁互层三种大的类型;其中,双层结构的重力流混合事件层进一步根据上下两个沉积单元厚度的差异可细分为两个亚类。多层结构的混合事件层主要为流体侵蚀或砂体液化成因,多发育于混合事件层沉积近端;双层结构与频繁互层结构的混合事件层主要为流体减速膨胀、泥质碎屑流中碎屑颗粒的差异沉降成因,多发育于混合事件层沉积远端。相同沉积单元组成的沉积层在垂向上的规律叠置是岩心中识别重力流混合事件层沉积的可靠依据;在未明确其沉积过程的情况下可能会导致沉积信息的错误解读。同时,重力流混合事件层的发育会导致重力流沉积非均质性增强,不利于常规油气的储集;但是,重力流混合事件层形成的细粒沉积物是非常规油气“甜点”区发育的优势沉积岩相组合类型。
中文关键词:浊流  碎屑流  混合事件层  地质意义  陆相湖盆
 
Hybrid event beds in lacustrine basins and their geological significances
Author NameAffiliationAddress
Yang Tian State Key Laboratory of oil and Gas Reservior Geology and Exploitation (Chengdu University of Technology) 成都市成华区二仙桥东三路1号
Cao Yingchang School of Geosciences, China University of Petroleum (East China) 
Tian Jingchuan State Key Laboratory of oil and Gas Reservior Geology and Exploitation (Chengdu University of Technology) 
Li Shixiang Research Institute of Petroleum Exploration and Development 
Zhou Xinping Research Institute of Petroleum Exploration and Development 
Jin Jiehua School of Geosciences, China University of Petroleum (East China) 
Zhang Yian State Key Laboratory of oil and Gas Reservior Geology and Exploitation (Chengdu University of Technology) 
Abstract:Hybrid event beds are common in lacustrine basin, their formation and distribution is significance for understanding the evolution processes of gravity-flow and the conventional and unconventional oil and gas exploration and development in their deposits. Taking the gravity-flow deposits in the first member of the Liushagang formation in the Weixinan sag and the seventh member of Yanchang formation in the Ordos basin as examples, the sedimentary characteristics, types, formation mechanisms, depositional model as well as the oil and gas geological significances of hybrid event beds in lacustrine basin are discussed. The gravity-flow deposits in lacustrine basin including slide and slump deposits, sandy and muddy debirs flow deposits, high and low density turbidity-current deposits, and the common hybrid event beds. Three types of hybrid event beds are subdivided, which include sandwich structure, bipartite structure, and banded structure. The bipartite structured hybrid event beds can further subdivided based on the thickness difference between the upper and lower division. Sandwich structured hybrid event beds are mainly caused by flow erosion or liquefaction and located in the proximal of hybrid event beds. Bipartite structured and banded structured hybrid event beds, which located in the distal of hybrid event beds, are mainly attributed to flow decelerate and expand, the different settling of detrital grains in muddy debris flow. The vertical stacking of different beds with the same internal depositional unit composition in core is the reliable identification mark for hybrid event beds. If we couldn’t reveal the formation processes of these hybrid event bed, it may cause misunderstanding of the depositional information. At the same time, the development of hybrid event bed will add the depositional heterogeneity of gravity-flow deposits, which is bad for conventional oil and gas preservation. However, the fine-grained deposits caused by hybrid event beds are the good lithofacies associations, which is the sweet spot for unconventional oil and gas development.
keywords:turbidity currents  debris flows  hybrid event bed  geological significances  lacustrine basin
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