石油学报 ›› 2017, Vol. 38 ›› Issue (8): 888-901.DOI: 10.7623/syxb201708004

• 地质勘探 • 上一篇    下一篇

南堡凹陷柳赞地区沙河街组三段中上部物源演化及砂体分布控制因素

刘欣1, 刘震1, 卢朝进1, 任梦怡1, 李亮2, 王时林2, 汪雄1, 高钦秋1   

  1. 1. 中国石油大学地球科学学院 油气资源与探测国家重点实验室 北京 102249;
    2. 中国石油冀东油田公司勘探开发研究院 河北唐山 063004
  • 收稿日期:2016-10-01 修回日期:2017-03-01 出版日期:2017-08-25 发布日期:2017-09-02
  • 通讯作者: 刘震,男,1963年2月生,1984年获西北大学学士学位,1990年获石油大学(北京)博士学位,现为中国石油大学(北京)地球科学学院教授、博士生导师,主要从事石油地质学基础及应用研究。Email:liuzhenjr@163.com
  • 作者简介:刘欣,女,1991年11月生,2014年获长江大学学士学位,现为中国石油大学(北京)地球科学学院硕士研究生,主要从事石油地质学基础及应用研究。Email:liuxin12_1991@163.com

Evolution of sedimentary source and controlling factors of sandstone body distribution in the middle-upper part of the third Member of Shahejie Formation in Liuzan area,Nanpu depression

Liu Xin1, Liu Zhen1, Lu Chaojin1, Ren Mengyi1, Li Liang2, Wang Shilin2, Wang Xiong1, Gao Qinqiu1   

  1. 1. College of Geosciences, China University of Petroleum;Key Laboratory for Hydrocarbon Accumulation Mechanism of Ministry of Education, Beijing 102249, China;
    2. Research Institute of Exploration and Development, PetroChina Jidong Oilfield Company, Hebei Tangshan 063004, China
  • Received:2016-10-01 Revised:2017-03-01 Online:2017-08-25 Published:2017-09-02

摘要:

沉积物源分析是沉积相分析、砂体分布预测及岩性油气藏形成和分布研究的核心内容。前人研究认为,南堡凹陷柳赞地区储集相类型单一,物源仅来自于NE向边界断层,然而钻探揭示的相序特征与NE向扇三角洲唯一物源的观点并不完全相符,导致砂体分布规律认识不清,制约了油气勘探。综合利用岩心、录井、测井和地震资料,通过高频层序地层分析、地震相和地震属性分析、有色反演等技术,在三级层序地层格架内对沉积物源分布、充填演化及砂体迁移特征进行研究,取得了以下新认识:1柳赞地区沙河街组三段除扇三角洲沉积以外,存在第二种有利储集体——近岸水下扇;2根据前积地震相反射特征分析发现,沙河街组三段中-晚期陡坡带物源方向变化剧烈,受构造沉降控制明显,呈现"顺时针旋转"演化:即SQⅢ沉积期,湖盆整体北高南低,发育来自NW向物源的扇三角洲相;SQIV沉积期,NE向剧烈抬升,形成NE向的扇三角洲相;SQV沉积期,湖盆东部开始抬升,发育来自东部物源的扇三角洲相;3建立了南堡凹陷柳赞地区沙河街组"三级控砂"模式:断层差异活动控制沉积物源发育特征;坡折带和湖平面变化控制储集体类型;沉积相类型控制砂体类型和分布。研究深化了陆相断陷盆地陡坡带强烈构造变动控制物源迁移的理论认识;同时,对于南堡凹陷老区的进一步挖潜具有一定指导意义。

关键词: 柳赞地区, 物源演化, 前积地震相, 近岸水下扇, 控砂模式

Abstract:

Sedimentary source analysis is a key task in research of sedimentary facies, prediction of sandstone body distribution, as well as the formation and distribution of lithologic reservoir. Previous studies have considered that the reservoir facies is of a single type in Liuzan area, Nanpu depression, and the provenance only comes from the boundary fault. However, the facies sequence characteristics indicated by drilling cannot fully conform to the viewpoint that there is only a single provenance from the NE-trending boundary fault. Thus, it is difficult to recognize the distribution laws and controlling factors of sand bodies, which restricts the further exploration of oil and gas in the study area. Comprehensively based on coring, logging and seismic data, the distribution, filling evolution and migration patterns of sand bodies were investigated deeply by analyses of high frequency sequence stratigraphy, seismic facies and seismic attributes, in combination with colored inversion. New understandings are achieved as below:(1) In addition to fan delta deposition, the nearshore subaqueous fan is recognized as the second kind of favorable reserving bodies in the third Member of Shahejie Formation, Liuzan area. (2) Based on the progradation seismic facies characteristics, it is found that in the third Member of Shahejie Formation the steep slope belt of sediments had drastically changed provenance direction in the middle and late period; as dramatically controlled by tectonic subsidence, it shows a "clockwise rotation" evolution, i.e., in the SQⅢ sedimentary period, the lacustrine basin was generally high in the north while low in the south, where fan delta facies with NW-trending provenance was developed; in the SQIV sedimentary period, NE-trending provenance uplifted to form NE-trending fan delta facies; in the SQV sedimentary period, the eastern lacustrine basin started to uplift, where the fan delta facies was developed from the eastern provenance. (3) The "three-grade sand control" model is established in Shahejie Formation, Liuzan area, Nanpu depression. The development characteristics of provenance are controlled by fault differential actives; the reserving body types are controlled by the variations in slope break zone and lake-level fluctuation; the sandstone body types and distribution were controlled by sedimentary facies types. This research not only deepens the theoretical knowledge of strong tectonic variations able to control provenance migration in the steep slope belt of continental fault-depressed basin, but also provides guidance to further exploration in old areas of Nanpu depression.

Key words: Liuzan area, evolution of source, progradation seismic facies, nearshore subaqueous fan, controlling model of sandstone body

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