新疆石油地质

新疆石油地质 ›› 2003, Vol. 24 ›› Issue (6): 530-532.

• 油气勘探 • 上一篇    下一篇

断层紧闭指数的计算及其地质意义

田辉1, 查明2, 石新璞3, 胡平3   

  1. 1.中国科学院 广州地球化学研究所 广东 广州 510640;
    2.石油大学 地球资源与信息学院,山东 东营 257061;
    3.中国石油 新疆油田分公司 勘探开发研究院,新疆 克拉玛依 834000
  • 收稿日期:2002-12-16 出版日期:2003-12-01 发布日期:2020-08-24
  • 作者简介:田辉(1977-),男,河北保定人,在读博士研究生,研究方向为油气地球化学与油气成藏。

Calculation of Fault Tightness Index and Its Significance for Fault Sealing

TIAN Hui1, ZHA Ming2, SHI Xin-pu3, HU Ping3   

  1. 1. Guangzhou Institute of Geochemistry, CAS, Guangzhou, Guangdong 510640, China;
    2. Institute of Earth Resources andInformation, University of Petroleum, Dongying, Shandong 257061, China;
    3. Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China
  • Received:2002-12-16 Online:2003-12-01 Published:2020-08-24

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摘要： 断面紧闭程度是决定断层封闭与否的重要因素之一。在对断面正压力及泥岩涂抹分析的基础上,提出了断层紧闭指数的概念,将断层紧闭指数(IFT)定义为断面正压力σF与断裂带物质抗压强度σC之比。当IFT大于1时,断面紧闭,封闭性较好;反之,封闭性较差。对北三台北断裂封闭性的研究表明,IFT值沿断层的分布具非均一性,只要油层或紧邻其上地层处的IFT值大于1,就可垂向封闭油气,不要求油层之上各处的封闭性都好;同一时期内IFT的大小与深度没有必然的关系,深度大,并不表明IFT大和封闭性好,油气仍可能通过断层向上运移。

关键词: 断层, 应力, 泥岩, 准噶尔盆地

Abstract: The degree of fault tightness is one of the important factors for fault sealing control. According to analyses of faulting stress and shale smearing, the fault tightness index (IFT) is defined as the ratio of faulting stress σF to the compressive strength σC of fault zone. Where the value of IFT is bigger than 1, the fault tightens and seals well;otherwise,it seals worse. The study shows that IFT values distributed along northern faulting in Beisantai field are of non-homogeneity. As long as the IFT is bigger than 1 in oil reservoir or its overlying stratum, the oil-gas in it could be vertically sealed in incompletely sealed conditions above the reservoir. In addition,the IFT values are not related to the buried depth during the same geological time,for the deeply buried fault couldn’t mean the bigger IFT value and good sealing property, but the oil-gas in it still may migrate upward throughthe fault.

Key words: fault, stress, shale, Junggar basin

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