西南石油大学学报(自然科学版) ›› 2020, Vol. 42 ›› Issue (1): 1-9.DOI: 10.11885/j.issn.1674-5086.2018.09.17.02

• 地质勘探 •    下一篇

东营凹陷南坡断块类型及其油气封闭性研究

杨怀宇1,2   

  1. 1. 中国石化胜利油田分公司勘探开发研究院, 山东 东营 257000;
    2. 中国石化胜利油田博士后科研工作站, 山东 东营 257000
  • 收稿日期:2018-09-17 出版日期:2020-02-10 发布日期:2020-02-10
  • 通讯作者: 杨怀宇,E-mail:yanghuaiyu.slyt@sinopec.com
  • 作者简介:杨怀宇,1982年生,男,汉族,安徽铜陵人,副研究员,博士,主要从事油区沉积学及构造特征方面的研究工作。E-mail:yanghuaiyu.slyt@sinopec.com
  • 基金资助:
    “十三五”国家科技重大专项(2016ZX05006);中国石化胜利油田分公司科技攻关项目(YKB1214)

Fault Block Types and Their Fault Seals in the Southern Slope of the Dongying Depression

YANG Huaiyu1,2   

  1. 1. Geological Research Institute, Shengli Oilfield Company, SINOPEC, Dongying, Shandong 257000, China;
    2. Working Stations for Postdoctors, Shengli Oilfield Company, SINOPEC, Dongying, Shandong 257000, China
  • Received:2018-09-17 Online:2020-02-10 Published:2020-02-10

摘要: 东营凹陷南部斜坡带沙河街组发育大量顺向及反向断层组成的断块圈闭,处于有利构造背景下的断块圈闭仅部分成藏,因此,断层的地质属性制约了油气封闭的有效性。从断层的各项属性如活动性、断距、砂地比、断面应力、紧闭指数及SGR因子等入手,针对研究区的顺向断块、反向断块及倾向相反的顺反向组合断块等3种主要类型开展封闭性研究。研究表明,高含砂量层系(沙二段)反向断块更易成藏,顺向断块成藏概率较低;中、低含砂量层系(沙四下亚段-孔店组)顺向、反向断块均可成藏,且反向断块更为有利。此外,倾向相反的共轭组合断块研究表明,斜交式比共线式组合断块的封堵性更好,斜交式断块的主控断层及辅助断层满足经验断层封闭参数,该共轭组合断块亦是有利类型。

关键词: 断层封闭性, 断层样式, 断块类型, 断块油藏, 东营凹陷南坡

Abstract: There are numerous fault traps formed by consequent and antithetic faults in the Shahejie Formation of the southern slope of the Dongying Depression. The tectonics of these fault traps is favorable for reservoir formation but only part of the fault traps were formed into reservoir. Therefore, the geological properties of these faults restrict the effectiveness of their seal for oil and gas. This study examines various fault properties, such as activity, displacement, sandstone thickness to total formation thickness ratio, cross-sectional stress, interstitial fault tolerance, and shale gouge ratio to investigate the seal of the three main fault block types in the study area, namely consequent, antithetic, and composite consequent-antithetic fault blocks. The results demonstrated that the antithetic fault blocks of the systems with high sand content (Member 2 of the Shahejie Formation) is favorable for reservoir formation whereas reservoirs are less likely to form in the consequent fault blocks. Reservoirs can form in both the consequent fault blocks and the antithetic fault blocks of systems with medium and low sand content (Lower Member 4 of the Shahejie Formation and Kongdian Formation). In particular, formation in the antithetic fault blocks is more common. In addition, research on conjugate composite fault blocks with opposite dip directions shows that the seal of the oblique composite fault blocks is better than that of their collinear counterparts. The master and auxiliary faults with oblique composite fault blocks fulfill the empirical fault seal parameters and the corresponding collinear composite fault blocks is also favorable for reservoir formation.

Key words: fault seal, fault pattern, fault block type, fault block reservoir, southern slope of the Dongying Depression

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