岩性油气藏 ›› 2024, Vol. 36 ›› Issue (3): 106–116.doi: 10.12108/yxyqc.20240310

• 地质勘探 • 上一篇    

渤东凹陷新生代伸展-走滑叠合断裂时空差异演化模式及控藏效应

董柔1,2, 李坤2, 殷际航2, 薛煜恒2, 江涛3, 徐国盛2   

  1. 1. 中国石油长庆油田分公司 第十一采油厂, 甘肃 庆阳 745000;
    2. 油气藏地质及开发工程国家重点实验室(成都理工大学), 成都 610059;
    3. 中海石油(中国)有限公司天津分公司, 天津 300452
  • 收稿日期:2022-12-17 修回日期:2023-03-14 发布日期:2024-04-30
  • 通讯作者: 李坤(1980—),男,博士,讲师,主要从事石油构造分析与含油气盆地分析方面的科研和教学工作。Email:lk1210_7758@qq.com。 E-mail:lk1210_7758@qq.com
  • 作者简介:董柔(1996—),男,硕士,助理工程师,主要从事石油构造解析与含油气盆地分析研究工作。地址:(745000)甘肃省庆阳市西峰区石油东路长庆油田陇东生产指挥中心。Email:1910948089@qq.com。
  • 基金资助:
    国家科技重大专项“中国近海富烃凹陷优选与有利勘探方向预测”(编号:2016ZX05024-002-007)资助。

Spatial-temporal differential evolution model and reservoir control effect of Cenozoic extensional and strike-slip superimposed faults in Bodong Sag

DONG Rou1,2, LI Kun2, YIN Jihang2, XUE Yuheng2, JIANG Tao3, XU Guosheng2   

  1. 1. No. 11 Oil Production Plant, PetroChina Changqing Oilfield Company, Qingyang 745000, Gansu, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;
    3. Tianjin Branch of China National Offshore Oil Corporation, Tianjin 300452, China
  • Received:2022-12-17 Revised:2023-03-14 Published:2024-04-30

摘要: 以三维地震精细解释为基础,通过构造剖面恢复,系统分析了渤东凹陷新生代伸展-走滑叠合断裂的时空差异演化特征及控藏作用。研究结果表明:①渤东凹陷新生代广泛发育以 NNE 向为主干、NE向为派生、NW 向为叠加的伸展-走滑叠合断裂体系,可划分为强伸展-弱走滑断裂和强走滑-弱伸展断裂 2 类;整体具有深浅分层、南北分段的特征,纵向上,古近系主要发育强伸展-弱走滑断裂,断裂大而稀,新近系—第四系主要发育强走滑-弱伸展断裂,断裂小而密;平面上,同一断裂在不同段的构造组合样式存在差异。②研究区新生代伸展-走滑叠合断裂的演化主要表现为北部断裂活动强度“早强晚弱”,中部断裂继承性持续发育,南部断裂活动强度“早弱晚强”;演化模式分为初始断陷(孔店组—沙四段沉积期)、强烈断陷(沙三段—东营组沉积期)和走滑坳陷(馆陶组—平原组沉积期)3 个阶段,初始断陷阶段,NNE—NE 向强伸展与弱走滑叠合,NE 向强伸展-弱走滑断裂为主控,NW 向先存断裂活化,分割凹陷;强烈断陷阶段,NNE—NE 向强伸展与弱走滑叠合,NNE 向强伸展-弱走滑断裂变为主控,NW 向断裂活动减弱或停止;走滑坳陷阶段,NNE 向强走滑与弱伸展叠合,断裂不控制沉积,但对地层展布具有调整作用。③研究区伸展-走滑叠合断裂的发育演化与油气成藏密切相关,整体具有“早期伸展控源、晚期走滑控运、多期叠加控圈”的特征,东部斜坡带是油气运聚的有利区。

关键词: 伸展-走滑叠合断裂, 断裂演化, 油气运聚, 断裂控藏, 沙河街组, 东营组, 新生代, 渤东凹陷

Abstract: Based on 3D seismic interpretation, the spatial-temporal differential evolution characteristics and reservoir control effect of Cenozoic extensional and strike-slip superimposed faults in Bodong Sag were systematically analyzed through structural profile restoration. The results show that:(1)Extensional and strike-slip superimposed faults with NNE trending as the main stem, NE trending as the derivative, and NW trending as the superposition, were widely developed in Cenozoic in Bodong Sag, and these faults can be divided into two types: strong extensional and weak strike-slip faults, strong strike-slip and weak extensional faults. The superimposed fault system has obvious characteristics of deep and shallow stratification and north-south segmentation. Vertically, the Paleogene mainly developed strong extensional and weak strike-slip faults, which are large and sparse, and the Neogene-Quaternary mainly developed strong strike slip and weak extensional faults, which are small and dense. On the plane, there are differences in the structural combination styles of the same fault in different segments.(2)The evolution of the Cenozoic extensional and strike-slip superimposed faults in the study area are manifested as early strong and late weak activity of the northern faults, inherited and continuous development of the central faults, and early weak and late strong activity of the southern faults. The evolution model can be divided into three stages:initial fault depression stage(Kongdian Formation-Sha 4 sedimentary period), strong fault depression stage (Sha 3 member-Dongying Formation sedimentary period) and strike-slip depression stage (Guantao Formation-Pingyuan Formation sedimentary period). In the initial fault depression stage, NNE-NE trending strong extensional and weak strike-slip faults superimposed, dominated by NE trending strong extensional and weak strike-slip faults, with NW trending pre-existing fault activation, dividing the depression. In the strong fault depression stage, NNE-NE trending strong extensional and weak strike-slip faults superimposed, dominated by NNE trending strong extensional and weak strike-slip faults, with NW trending fault activity weakened or stopped. In the strike-slip depression stage, NNE trending strong strike-slip and weak extensional faults superimposed, and the faults did not control the sedimentation, but has adjustment on stratigraphic distribution.(3)The development and evolution of the extensional and strike-slip superimposed faults in the study area are closely related to hydrocarbon accumulation, with the overall characteristics of early extensional faults control source, late strikeslip faults control migration, and multi-stage superimposed faults control traps. The eastern slope zone is a favorable area for hydrocarbon migration and accumulation.

Key words: extensional and strike-slip superimposed fault, fault evolution, hydrocarbon migration and accumulation, fault control reservoir, Shahejie Formation, Dongying Formation, Cenozoic, Bodong Sag

中图分类号: 

  • P618.13
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