Twin Horsetailing Structures in the Extensional Regime based on Physical Experiment

IF 3.5 3区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Haigang LAO, Hongyuan XU, Yongshi WANG, Cui MAO, Osman Salad HERSI, Dianheng LI
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Abstract

Horsetailing is an important feature to identify the strike-slip structure and indicates the movement mode of the fault. However, the formation mechanism of horsetailing in the extensional regime remains unclear. In this study, the formation process of horsetailing is reproduced through physical experiment, simulating the Linnan sag in the extensional regime. The results of the physical experiment demonstrates that the formation of the horsetailing in the extensional regime requires two phases of non-coaxial stretching plus the segment of the principal fault. The stretching distance in the early phase is slightly smaller than that in the middle–late phase. The segment point of the principal fault is only the intersection of the horsetailing structure and the principal fault. The horsetailing formed in the extensional regime is different from that in the strike-slip regime. For the formation of structure, the principal fault is dip-slip in the early phase and then becomes an oblique-slip in the middle–late phase, and the horsetailing is composed of the middle–late new tensile faults. The fault properties of the horsetailing in the extensional regime has important guiding significance for the longitudinal fluid migration along the fault in petroliferous basins.

Abstract Image

基于物理实验的伸展区双马尾构造
马尾现象是识别走滑构造的重要特征,反映了断层的运动方式。然而,在伸展状态下马尾化的形成机制尚不清楚。本研究通过物理实验,模拟伸展状态下的临南凹陷,再现了马纹的形成过程。物理实验结果表明,在伸展状态下,马尾的形成需要两阶段的非同轴拉伸加上主断层的一段。早期拉伸距离略小于中后期拉伸距离。主断层的分段点仅为排马构造与主断层的交点。张拉构造与走滑构造形成的马尾效应是不同的。在构造形成上,早期以倾滑为主,中后期转为斜滑为主,中后期由新张性断裂组成。拉张期马槽的断裂性质对含油气盆地中流体沿断层纵向运移具有重要的指导意义。
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来源期刊
Acta Geologica Sinica ‐ English Edition
Acta Geologica Sinica ‐ English Edition 地学-地球科学综合
CiteScore
3.00
自引率
12.10%
发文量
3039
审稿时长
6 months
期刊介绍: Acta Geologica Sinica mainly reports the latest and most important achievements in the theoretical and basic research in geological sciences, together with new technologies, in China. Papers published involve various aspects of research concerning geosciences and related disciplines, such as stratigraphy, palaeontology, origin and history of the Earth, structural geology, tectonics, mineralogy, petrology, geochemistry, geophysics, geology of mineral deposits, hydrogeology, engineering geology, environmental geology, regional geology and new theories and technologies of geological exploration.
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