石油学报 ›› 2006, Vol. 27 ›› Issue (5): 24-27,34.DOI: 10.7623/syxb200605004

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陕北斜坡东部三叠系油气富集规律研究

赵靖舟1, 武富礼1, 闫世可2, 顾根深2, 郭德运3,2, 杨县超3,2   

  1. 1. 西安石油大学油气资源学院, 陕西, 西安, 710065;
    2. 延长石油集团公司, 陕西, 延川, 717208;
    3. 西北大学, 陕西, 西安, 710069
  • 收稿日期:2005-11-03 修回日期:2006-01-12 出版日期:2006-09-25 发布日期:2010-05-21
  • 作者简介:赵靖舟,男,1962年11月生,1983年毕业于西北大学地质系,现为西安石油大学油气资源学院院长、教授,主要从事成藏地质学、天然气地质及地球化学研究.E-mail:jzzhao@xsyu.edu.cn
  • 基金资助:
    教育部“新世纪优秀人才支持计划”资助(NCET-05-0876)

Regularity of Triassic petroleum accumulation and distribution in the east part of North Shaanxi Slope

Zhao Jingzhou1, Wu Fuli1, Yan Shike2, Gu Genshen2, Guo Deyun3,2, Yang Xianchao3,2   

  1. 1. School of Petroleum Resources, Xi'an Shiyou University, Xi'an 710065, China;
    2. Yanchang Petroleum Corporation, Yanchuan 717208, China;
    3. Northwest University, Xi'an 710069, China
  • Received:2005-11-03 Revised:2006-01-12 Online:2006-09-25 Published:2010-05-21

摘要: 陕北斜坡东部三叠系构造简单,为平缓的西倾单斜,断裂褶皱均不发育,因此该区三叠系油藏的形成和分布一直被认为主要受沉积相控制,油藏类型主要为岩性油藏.研究结果表明,陕北斜坡三叠系油藏的形成与富集实际上受沉积相带、鼻状隆起背景、运移通道、水动力等多重因素控制.鼻状隆起背景的存在是中生界油气藏形成和富集的一个重要条件,大中型油田的形成均与一定规模的鼻状隆起背景有关.对延长组上部长1-长2-长3成藏组合以及侏罗系成藏组合而言,断裂及裂缝等垂向运移通道对其油气藏形成和分布具有重要控制作用,水动力则是三叠系油藏形成的一个重要圈闭因素.因此,陕北斜坡东部三叠系油藏的类型复杂多样,除岩性油藏外,构造-岩性、构造-水动力等复合油藏是该区三叠系油藏的主要类型.

关键词: 鄂尔多斯盆地, 陕北斜坡, 三叠系油藏, 油气分布规律, 油藏类型

Abstract: The Triassic structure in the east part of North Shaanxi Slope of Ordos Basin is a large smooth westward monocline and characterized by simple structure without folds and faults.Accordingly,the Triassic petroleum accumulation and distribution in the North Shaanxi Slope has been regarded as mainly being controlled by sedimentary facies,and therefore the types of the reservoir are lithologic,on which the structural and other factors are believed to have no important effect.Nevertheless,the present study shows that the formation and enrichment of the Triassic reservoir in North Shaanxi Slope of Ordos Basin are actually controlled by multiple factors,such as sedimentary facies,background of nose-shaped uplift,migration pathway,regional cap-rocks and hydrodynamics.Especially,the background of nose-shaped uplift is an important condition for the formation and enrichment of the Mesozoic reservoir.The formation of the mid-large oil fields has close relations with such a structural background.For the accumulation combination of Chang 1,Chang 2 and Chang 3 of Yanchang Formation and Jurassic,the faults especially fractures as migration pathways have significant effects on the formation and distribution of the Mesozoic reservoir.Hydrodynamics is an important trap factor for the Triassic reservoir.Consequently,the types of the Triassic reservoir are complicated and variable.In addition,the structural-lithologic and structural-hydrodynamic composite reservoirs are possibly the main types of the Triassic reservoir in the North Shaanxi Slope of Ordos Basin.

Key words: Ordos Basin, North Shaanxi Slope, Triassic reservoir, oil-gas distribution, reservoir type

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