地学前缘 ›› 2025, Vol. 32 ›› Issue (5): 52-67.DOI: 10.13745/j.esf.sf.2024.7.58

• 深部过程示踪 • 上一篇    下一篇

准噶尔盆地腹地莫西庄地区弥散式走滑断层特征与成因机制

赵利1(), 董大伟2,*(), 李志鹏3, 梁建军3, 王光增4   

  1. 1.山东农业大学 资源与环境学院, 山东 泰安 271018
    2.山东石油化工学院, 山东 东营 257061
    3.中国石化新疆新春石油开发有限责任公司, 新疆 乌鲁木齐 830011
    4.中国海洋大学 海洋地球科学学院, 山东 青岛 266100
  • 收稿日期:2024-04-12 修回日期:2024-07-26 出版日期:2025-09-25 发布日期:2025-10-14
  • 通信作者: 董大伟
  • 作者简介:赵 利(1988—),男,讲师,主要从事区域大地构造及油气区构造解析工作。E-mail: orchidy@126.com
  • 基金资助:
    国家自然科学基金项目(42072162);国家自然科学基金项目(42072235);山东省自然科学基金项目(ZR2020MD036)

The characteristic and mechanics of distributed strike-slip faults in Moxizhuang area, interior of the Junggar Basin

ZHAO Li1(), DONG Dawei2,*(), LI Zhipeng3, LIANG Jianjun3, WANG Guangzeng4   

  1. 1. College of Resources and Environment, Shandong Agriculture University, Tai’an 271018, China
    2. Shandong Institute of Petroleum and Chemical Technology, Dongying 257061, China
    3. Xinjiang Xinchun Petroleum Development Co., Ltd., SINOPEC, Ürümqi 830011, China
    4. College of Marine Geosciences, Ocean University of China, Qingdao 266100, China
  • Received:2024-04-12 Revised:2024-07-26 Online:2025-09-25 Published:2025-10-14
  • Contact: DONG Dawei

摘要: 准噶尔盆地腹地发育的走滑断层具有数量多、断距小、平行等距和面状分布的特点,不同于盆地边缘走滑断层,不能完全用里德尔剪切模型来解释其成因机制。这将制约该地区走滑断层和局部应力场的构造解析,以及油气勘探部署。为此,本文以莫西庄油田为研究区,基于高精度三维地震数据开展构造解析和构造物理模拟,分析了此类走滑断层的变形特征和成因机制。结果表明:(1)研究区走滑断层弥散式分布,具有走向分段、规模分级、南北分区、垂向分层、成因分类和演化分期特征,最大平移距离6.4~8.3 km,落差小于46 m;(2)多期构造变形和滑脱层造成走滑断层在垂向上发育多个构造层,分别具有“断接式”和“断隔式”特征;(3)研究区走滑断层可以形成于弥散剪切,NEE-SWW走向断层发育为同向里德尔剪切R,NE-SW走向断层为反向里德尔剪切R',近SN走向断层则为低角度反向剪切R'L,EW走向断层为低角度同向剪切RL;(4)弥散剪切控制断块间相对隆升和沉降、断块内应力集中和释放、断层叠接部位拉分和压隆,使得油源断层、应力集中断块和构造高部位成为油气有利聚集区;(5)在准噶尔盆地晚二叠世以来整体左旋和盆地边缘右行压扭背景下,莫索湾凸起对盆1井西凹陷南部边界施加的左行压扭是研究区弥散剪切变形的直接诱因。

关键词: 走滑断层, 弥散剪切, 盆地腹地, 成因机制, 莫西庄, 准噶尔盆地

Abstract:

The strike-slip faults in the interior of the Junggar Basin are characterized by large number, small displacement, and parallel, evenly spaced distribution within an area. These characteristics differ from those of faults in the marginal basin and cannot be fully explained by the Riedel shear model. This limitation constrains the analysis of strike-slip faults, local stress fields, and hydrocarbon exploration. Therefore, taking the Moxizhuang oilfield as the study area, this paper investigates the characteristics and mechanics of these faults through structural analysis and physical simulation. The results show that: (1) The strike-slip faults are widely distributed and exhibit characteristics of classification, stratification, grading, zoning, staging, and segmentation. Their maximum strike-slip displacement is 6.4-8.3 km, with a vertical throw of less than 46 m. (2) Multi-stage structural deformation and detachment layers vertically divide the strike-slip faults into several structural layers, each displaying characteristics of both inheritance and separation. (3) Distributed shear deformation led to the formation of strike-slip faults with diverse strikes. The NEE-SWW-trending strike-slip faults are synthetic Riedel shears (R), the NE-SW-trending ones are antithetic Riedel shears (R'), the near S-N-trending ones are low-angle antithetic Riedel shears (R'L), and the E-W-trending strike-slip faults are low-angle synthetic Riedel shears (RL). (4) The distributed shear controlled the relative uplift and subsidence of fault blocks, triggered local stress concentration and release, and generated pull-apart and push-up structures within step-over zones. These features significantly enhance hydrocarbon accumulation potential in faults connecting source layers, structural highs, and fault blocks characterized by concentrated stress. (5) Under the influence of a counterclockwise rotational stress field and dextral boundary transpression within the Junggar Basin, the counterclockwise transpression exerted by the Mosuowan Uplift on the southern boundary of the Penyijingxi Sag triggered the distributed shear deformation there.

Key words: strike-slip fault, distributed shear, interior of basin, mechanics, Moxizhuang area, Junggar Basin

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