| 川西坳陷上侏罗统浅水漫湖沉积特征与砂体叠置模式 |
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| 引用本文： | 刘君龙,杨克明,纪友亮,朱宏权,黄富祥,贾浪波.川西坳陷上侏罗统浅水漫湖沉积特征与砂体叠置模式[J].古地理学报,2015,17(4):503-516. |
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| 作者姓名： | 刘君龙 杨克明 纪友亮 朱宏权 黄富祥 贾浪波 |
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| 作者单位： | 1.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
2 中国石油化工股份有限公司西南分公司,四川成都 610081
3 中国石油大庆油田第七采油厂,黑龙江大庆 163000 |
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| 基金项目： | 国家自然科学基金项目(编号:41272157)和国家科技重大专项(编号:2011ZX05003-002)联合资助 |
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| 摘 要： | 川西坳陷在上侏罗统蓬莱镇组沉积期,地形平缓、气候干旱,湖平面频繁变化,发育了一套以浅水三角洲-漫湖为主的沉积体系。基于高分辨率层序地层学理论,通过对野外露头、岩心、分析化验和钻井资料的综合利用,阐明了发育在湖平面频繁变化背景下的浅水漫湖沉积特征,总结了砂体垂向叠置关系和平面分布规律,建立了浅水漫湖沉积体系砂体叠置模式。(1)分流河道和滩坝是研究区内浅水漫湖沉积体系的主要微相类型;(2)分流河道垂直于湖岸线分布,滩坝平行于湖岸线分布,在高频层序发育过程中,由于湖浪淘洗、河流进积等因素的改造,浅水漫湖沉积砂体经历了沉积-破坏-再沉积的过程,在平面上表现为分流河道切割多期平行于湖岸线的滩坝砂;(3)多种成因砂体叠置模式可以分为4种,分别为同期同相自旋回叠置模式、同期异相自旋回叠置模式、不同期同相异旋回叠置模式和不同期不同相异旋回叠置模式。
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| 关 键 词： | 浅水漫湖 沉积特征 砂体叠置模式 蓬莱镇组 侏罗系 川西坳陷 |
| 收稿时间： | 01 December 2014 |
Sedimentary characteristics and sand-body superposed patterns of flood-overlake deposits of the Upper Jurassic in Chuanxi Depression |
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| Liu Junlong,Yang Keming,Ji Youliang,Zhu Hongquan,Huang Fuxiang,Jia Langbo.Sedimentary characteristics and sand-body superposed patterns of flood-overlake deposits of the Upper Jurassic in Chuanxi Depression[J].Journal of Palaeogeography,2015,17(4):503-516. |
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| Authors: | Liu Junlong Yang Keming Ji Youliang Zhu Hongquan Huang Fuxiang Jia Langbo |
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| Institution: | 1.State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249;2.Southwest Company,SINOPEC,Chengdu 610081,Sichuan;3.Seventh Oil Production Plant of Daqing Oil Company,CNPC,Daqing 163000,Heilongjiang |
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| Abstract: | The Upper Jurassic Penglaizhen Formation in Chuanxi Depression is a set of flood-overlake deposits at low angular ground,under arid climatic condition and with lake level frequently fluctuating. Based on high-resolution sequence stratigraphy,we analyzed the sedimentary characteristics of flood-overlake deposits by integrating outcrop,core,experiments and drilling data, summarized its vertical stacking as well as horizontal distribution patterns,and the sand-body superposed patterns of flood-ouerlake were constructed. (1)Distributary channels and beach bars constitute the main facies types in the study area;(2)Distributary channels stretched vertical to the lake shoreline,while beach bars developed along the lake shoreline,with the formers constantly cutting through phases of the latters from alternating destruction and sedimentation by wave erosion and debris progradation into the lake,during development of high-frequency sequences;(3)Four types of sandbody superimposed patterns of different origins were classified,namely same time same facies autogenic type,same time different facies autogenic type,different time same facies allogenic type and different time different facies allogenic type. |
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| Keywords: | flood-overlake sedimentary characteristics sand-body superposed pattern Penglaizhen Formation Jurassic Chuanxi Depression |
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