石油与天然气地质 ›› 2021, Vol. 42 ›› Issue (2): 469-480.doi: 10.11743/ogg20210216

• 油气地质 • 上一篇    下一篇

苏北盆地高邮凹陷古近系阜宁组断层形成过程及其砂箱物理模拟

唐旭1,2(), 孙永河1,3,*(), 胡慧婷1,3, 于雯泉4, 唐海氢5   

  1. 1. 东北石油大学 地球科学学院, 黑龙江 大庆 163318
    2. 中国石油大学(北京) 地球科学学院, 北京 102249
    3. 东北石油大学 “断裂控藏”CNPC重点实验室, 黑龙江 大庆 163318
    4. 中国石化 江苏油田分公司 勘探开发研究院, 江苏 扬州 225009
    5. 中国石油 华北油田分公司 第三采油厂, 河北 河间 062450
  • 收稿日期:2019-01-10 出版日期:2021-04-28 发布日期:2021-04-21
  • 通讯作者: 孙永河 E-mail:415190403@qq.com;syh79218@163.com
  • 作者简介:唐旭(1994—),男,硕士研究生,盆地构造解析。E-mail: 415190403@qq.com
  • 基金资助:
    国家自然科学基金项目(41572127);国家科技重大专项(2016ZX05006-005)

Fault development and its analogue modeling in the Paleogene Funing Formation in Gaoyou Sag, Subei Basin

Xu Tang1,2(), Yonghe Sun1,3,*(), Huiting Hu1,3, Wenquan Yu4, Haiqing Tang5   

  1. 1. School of Earth Sciences, Northeast Petroleum University, Daqing, Heilongjiang 163318, China
    2. College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China
    3. Laboratory of CNPC Fault Controlling Reservoir, Northeast Petroleum University, Daqing, Heilongjiang 163318, China
    4. Exploration and Development Research Institute of Jiangsu Oilfield Company, SINOPEC, Yangzhou, Jiangsu 225009, China
    5. The 3rd Oil Production Plant of Huabei Oilfield Company, PetroChina, Hejian, Hebei 062450, China
  • Received:2019-01-10 Online:2021-04-28 Published:2021-04-21
  • Contact: Yonghe Sun E-mail:415190403@qq.com;syh79218@163.com

摘要:

高邮凹陷阜宁组断层发育对凹陷演化过程及油气富集具有重要意义。高邮凹陷东部发育大量多米诺式组合的NW倾向断层,西部发育“Ⅴ”字型组合的NW及SE倾向的断层,断层发育特征的差异指示断层形成过程不同,不同区带断层形成机制尚不明确。通过三维地震解释、识别不整合面及残余地层,结合位移-埋深曲线分析、构造演化分析,证明了高邮凹陷边界断层在阜宁组为非同沉积断层,对凹陷内部次级断层的形成没有明显控制作用。凹陷东、西部不同组合类型的阜宁组断层均在NW-SE向统一应力场下形成,主要活动时期均为阜宁组沉积末期,在活动性上具有统一性。依据断裂解析结论及相似性原则,设计两组物理模拟实验。实验结果表明,高邮凹陷西部“Ⅴ”字型断层组合受双侧伸展作用形成,而东部多米诺式断层组合受单侧伸展作用控制,与东部斜坡背景无关。两组实验结果合理地解释了断层组合模式差异性的成因。区域上,戴南组沉积之前高邮凹陷与北部临泽凹陷为同一凹陷,凹陷形态西窄东宽,在伸展变形时期盆地两侧应力向中心传播速度不同,导致不同地区发育不同倾向断层的叠覆区域范围有所差异。

关键词: 断层组合样式, 断层活动性, 形成过程, 物理模拟, 阜宁组, 古近系, 高邮凹陷, 苏北盆地

Abstract:

The study of fault development characteristics of the Funing Formation in Gaoyou Sag is of great significance to the understanding of the sag evolution and oil-gas enrichment.There are a large number of domino-type faults dipping NW in the east of the sag, and Ⅴ-shaped faults dipping NW and SE in the west of the sag.The difference in fault development characteristics indicates different fault formation processes, and the fault formation mechanisms in different zones are yet to clarified.Through three-dimensional seismic interpretation, unconformity and residual stratum identification, combined with displacement-depth curve and structural evolution analyses, it is proven that the boundary faults in the Funing Formation of Gaoyou Sag are non-syndepositional, thus having no obvious control on the formation of secondary faults in the sag.All faults of different assemblages in the east and west of the sag are formed under uniform stress field striking NW-SE, with main activities occurring at the end of the Funing Formation deposition.Two sets of physical simulation experiments were therefore designed according to the analytic conclusion of faults and the principle of similarity.The experimental results show that the Ⅴ-shaped fault assemblage in the west is formed under bilateral extension, while the domino fault assemblage in the east is controlled by unilateral extension and has no link to the eastern slope.The results of the two sets of experiments can reasonably explain the causes of the differential fault assemblage patterns.Geographically, before the deposition of Dainan Formation, Gaoyou Sag was in the same sag with Linze Sag in the north of the basin that is characterized by a narrow west and wide east.During the extensional deformation period, the stress propagation velocity on both sides of the basin to the center was different, leading to the differential overlapping zones with faults striking to various directions in different areas.

Key words: fault assemblage pattern, fault activity, formation process, analogue modeling, Funing Formation, Paleogene, Gaoyou Sag, Subei Basin

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