石油与天然气地质 ›› 2022, Vol. 43 ›› Issue (4): 877-888.doi: 10.11743/ogg20220411

• 油气地质 • 上一篇    下一篇

陆相湖盆致密油储集砂体成因及发育模式

田景春1,2(), 梁庆韶1,2(), 王峰1,2, 余威1,2   

  1. 1.成都理工大学 沉积地质研究院, 四川 成都 610059
    2.成都理工大学 油气藏地质及开发工程国家重点实验室, 四川 成都 610059
  • 收稿日期:2022-01-14 修回日期:2022-05-18 出版日期:2022-07-14 发布日期:2022-07-14
  • 通讯作者: 梁庆韶 E-mail:tjc@cdut.edu.cn;liangqs@cdut.edu.cn
  • 第一作者简介:田景春(1963—),男,博士、教授,沉积岩石学与岩相古地理。E?mail: tjc@cdut.edu.cn
  • 基金项目:
    国家科技重大专项(2016ZX05046-001)

Genesis and development model of tight oil reservoir sand body in continental lacustrine basin: A case study on the Upper Triassic Chang 6 pay zone, Ordos Basin

Jingchun Tian1,2(), Qingshao Liang1,2(), Feng Wang1,2, Wei Yu1,2   

  1. 1.Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu,Sichuan 610059,China
    2.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu,Sichuan 610059,China
  • Received:2022-01-14 Revised:2022-05-18 Online:2022-07-14 Published:2022-07-14
  • Contact: Qingshao Liang E-mail:tjc@cdut.edu.cn;liangqs@cdut.edu.cn

摘要:

鄂尔多斯盆地上三叠统延长组6油层组(长6油层组)是盆地内致密油富集层段之一,致密油储集砂体特征及成因研究对于盆地内致密油的进一步勘探、开发具有重要的指导意义。以前人研究成果为基础,通过对华池—庆阳地区长6油层组岩心进行详细观察、分析,明确致密油储集砂体的类型及特征,深入分析长6油层组各种类型储集砂体之间的叠置关系。结果表明:鄂尔多斯盆地长6油层组致密油储集砂体主要包括4种类型,即三角洲前缘储集砂体、震积岩储集砂体、碎屑流沉积储集砂体和浊流沉积储集砂体;不同储集砂体类型在垂向上构成4种叠置关系类型,即震积岩储集砂体与三角洲前缘储集砂体叠置、震积岩储集砂体与碎屑流储集砂体叠置、碎屑流储集砂体与浊流储集砂体叠置以及震积岩储集砂体、碎屑流储集砂体与浊流储集砂体叠置。从三角洲前缘到湖盆中心,不同位置由于所处的古地貌背景和环境条件存在差异,导致不同成因类型砂体垂向相互叠置。通过对叠置关系进行分析,构建了基于区域沉积格局的长6油层组致密油储集砂体成因模式。

关键词: 成因模式, 储集砂体, 致密油, 长6油层组, 上三叠统, 鄂尔多斯盆地

Abstract:

The pay zone in the 6th member of the Upper Triassic Yanchang Formation (Chang 6 pay zone) is one of the tight oil-rich intervals in the Ordos Basin. The study on the characteristics and genesis of tight oil reservoir sand bodies is of guiding significance to further exploration and development of tight oil in the basin. Apart from multiple previous research results, we make a thorough analysis of cores from the Chang 6 pay zone in Huachi-Qingyang area to clarify the types and characteristics of the tight oil reservoir sand bodies therein, and discuss in detail the superimposing reservoir sand bodies of diverse types in the pay zone. The results show that the tight oil reservoir sand bodies of the Chang 6 pay zone can be mainly grouped into four types: delta front, seismite, debris-flow, and turbidite types. Four kinds of superimposing relationship are formed vertically, including seismite type superimposing with delta front type, seismite type superimposing with debris-flow type, debris-flow type superimposing with turbidite type, and seismite/debris-flow types superimposing with turbidite type. From the delta front to the center of the lacustrine basin, we can find sand bodies of diverse genesis in vertical superimposition due to changes of palaeogeomorphic settings and environmental conditions, which serve for constructing a genetic model of the tight oil reservoir sand bodies in the Chang 6 pay zone based on the regional depositional pattern.

Key words: genetic model, reservoir sand body, tight oil, Chang 6 pay zone, Upper Triassic, Ordos Basin

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