西南石油大学学报(自然科学版) ›› 2019, Vol. 41 ›› Issue (4): 74-80.DOI: 10.11885/j.issn.1674-5086.2018.09.29.01

• 地质勘探 • 上一篇    下一篇

涠西南凹陷TY油田断层封闭性定量评价

吴碧波, 邹明生, 陆江, 严恒, 曾小明   

  1. 中海石油(中国)有限公司湛江分公司, 广东 湛江 524057
  • 收稿日期:2018-09-29 出版日期:2019-08-10 发布日期:2019-08-10
  • 通讯作者: 邹明生,E-mail:zoumingsh@cnooc.com.cn
  • 作者简介:吴碧波,1987年生,男,汉族,湖北孝感人,工程师,主要从事石油地质方面的研究工作。E-mail:wubb6@cnooc.com.cn;邹明生,1974年生,男,汉族,吉林长春人,高级工程师,主要从事石油地质方面的研究工作。E-mail:zoumingsh@cnooc.com.cn;陆江,1979年生,男,汉族,湖南岳阳人,高级工程师,硕士,主要从事石油地质方面的研究工作。E-mail:lujiang2@cnooc.com.cn;严恒,1983年生,男,汉族,四川邛崃人,工程师,主要从事目标评价、滚动勘探开发方面的研究工作。E-mail:yanheng@cnooc.com.cn;曾小明,1987年生,男,汉族,江西赣州人,工程师,主要从事石油地质方面的研究工作。E-mail:zengxm4@cnooc.com.cn
  • 基金资助:
    国家科技重大专项(2016ZX05024-006)

A Quantitative Evaluation of Fault Sealing of the TY Oilfield in the Weixinan Sag

WU Bibo, ZOU Mingsheng, LU Jiang, YAN Heng, ZENG Xiaoming   

  1. CNOOC China Limited, Zhanjiang Branch, Zhanjiang, Guangdong 524057, China
  • Received:2018-09-29 Online:2019-08-10 Published:2019-08-10

摘要: 涠西南凹陷低凸起TY油田的块1构造为涠洲组的断块圈闭,高部位F2断层是成藏主控因素。从断层封闭机理及影响因素入手,综合考虑岩石泥质含量及压实强度,建立了岩石排驱压力与深度和泥质含量的定量关系式,利用该关系式分别计算目标储层和起封堵作用断层岩的排驱压力,对二者大小进行比较,实现定量评价断层封闭性。利用该方法对涠西南凹陷TY油田块1控圈断层F2的侧向封闭能力进行了分析。结果表明,H1和H2两个目的层对接的断层岩的排驱压力大于储层的排驱压力,具有封闭能力; H3和H4两层对接的断层岩与储层的排驱压力差为负值,不具备封闭油气能力。

关键词: 涠西南凹陷, 断裂, 排驱压力差, 断层封闭性, 定量评价

Abstract: Block 1 of the low uplifted TY Oilfield in the Weixinan Sag is within a fault trap of the Weizhou Formation and the F2 fault at a higher position is the key factor in reservoir formation. This study assessed the mechanisms and influencing factors of fault sealing to comprehensively consider the mud content and compaction levels of rocks to establish the quantitative relationships between the driving pressure of rocks and their depth and mud content. Relationship equations were employed to calculate the driving pressure of the target reservoir layers and the fault rocks which serve as a blockage. The two values were compared in a quantitative evaluation of fault sealing. The proposed method was used to analyze the lateral sealing ability of the F2 fault of Block 1 of the TY Oilfield in the Weixinan Sag. The results suggest that the driving pressure of the fault rocks connecting the two target layers H1 and H2 is greater than that of the reservoir layers; thus, the fault rocks are capable of sealing. Meanwhile, the faults rocks connecting H3 and H4 have a smaller driving pressure to that of the reservoir layers; thus, they cannot seal oil and gas.

Key words: Weixinan Sag, fracture, driving pressure difference, fault sealing, quantitative evaluation

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