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Geoscience ›› 2024, Vol. 38 ›› Issue (06): 1445-1457.DOI: 10.19657/j.geoscience.1000-8527.2024.051

• Energy Geology • Previous Articles     Next Articles

Control and Transformation of Control-hill Faults in Rift Basins During the Development of Fault-controlled Buried Hills: A Case Study of the Gangxi Fault and the Gangbei Buried Hill in the Huanghua Depression

ZHANG Jinning1(), WANG Wenjie1, NENG Yuan1, MA Xiao1, XIANG Honghan1, LIU Peiye1, MEI Yongxu1, YU Wenxin2   

  1. 1. China University of Petroleum (Beijing) at Karamay, Karamay, Xinjiang 834000, China
    2. School of Earth Science and Resources, Chang’an University, Xi’an, Shaanxi 710054, China
  • Online:2024-12-10 Published:2024-12-09

Abstract:

Fault-controlled buried hills is the main type of hydrocarbon-bearing structures, and research in this field has evolved from focusing on single weathered crust types to exploring multi-layered series within buried hill interiors.The control-hill fault, which defines the boundary of the buried hill, is a critical breakthrough point for studying this type of structure.Using the Gangxi Fault in the Huanghua Depression as a case study, this research explores the constraints imposed by mountain-controlling faults on buried hill development and the transformation of buried hill structures.We analyzed the geometric and kinematic characteristics of the mountain-controlling faults, as well as the macroscopic and internal structures and evolution of the Gangbei buried hill.The study reveals that the Gangxi Fault can be classified into three types: planar, listric, and slope-flat, which together form the macroscopic features of the boundary cliff surface.The movement rate of the Gangxi Fault during the Neogene was less than 20 m/Ma, while the average movement rate during the Oligocene and Paleogene was 100 m/Ma.In the Eocene, and the movement rate exceeded 200 m/Ma, with weaker fault activity in the southern section and stronger activity in the northern section along the strike.The Gongbei buried hill exhibits a macrostructure with higher elevation in the southern and lower elevation in the northern section.The evolution of the Gangbei buried hill consists of three stages: the inner stratum construction stage, the fault-controlled buried hill development stage, and the structural stabilization and subsidence stage.The geometry, kinematics, and evolution of the Gangxi Fault, as a control-hill fault in a continental rift basin, significantly impact the buried hill, primarily by controlling its formation process.It also affects the macro-morphology of the buried hill and the reconstruction of its internal structure, which in turn influences trap conditions, oil and gas migration, and reservoir performance.

Key words: fault-controlled buried hill, control-hill fault, continental rift basin, Huanghua Depression, Gangbei buried hill, Gangxi Fault

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