Halokinetically Overprinted Tectonic Inversion of the Penobscot 3D Volume Offshore Nova Scotia, Canada

IF 1.9 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Alexander L. Peace, Jordan J. J. Phethean, Scott Jess, Christian Schiffer
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引用次数: 0

Abstract

Polyphase fault evolution through reactivation is a globally observed phenomenon on passive margins. These structures play a crucial role in petroleum systems, offer vital constraints on rift and passive margin kinematics, and, in certain instances, serve as global markers for far-field stresses. Despite the significance of reactivated faults, understanding their kinematic evolution, existence, extent, and interactions within fault populations is often limited. This underscores the need for comprehensive investigations, including considerations of halokinesis in this process. This study presents a structural interpretation of a relay ramp identified in the Penobscot 3D seismic reflection survey offshore Nova Scotia, Canada. The ramp is characterized by two major SSE-dipping faults accompanied by smaller antithetic and synthetic normal faults with a general ENE-WSW strike. The two major faults exhibit evidence of reverse deformation in their lower sections, transitioning to normal offsets in their upper portions. Smaller faults predominantly affect younger strata without evidence of reactivation. Fault throw analysis indicates coupled movement on the main faults during both reverse and normal deformation intervals. Structural analysis suggests that these structures initially formed as reverse faults due to halokinesis and were subsequently reactivated during oceanward salt migration. The timing of Atlantic margin halokinesis aligns broadly with previously documented large-scale kinematic reorganization periods, suggesting similar kinematic events triggered salt movements in the Penobscot area. The observed kinematic dichotomy at depth is crucial, highlighting the potential oversight of polyphase deformation in areas where seismic data only captures near-surface structures. Recognising salt's role in kinematic reactivation is vital, explaining inversion phenomena and generating economically important trapping structures globally. This study implies that reactivation of structures in passive margins may be more widespread than previously acknowledged, particularly if seismic data only captures upper portions of structures.

Abstract Image

加拿大新斯科舍近海佩诺布斯科特三维体积的卤化叠印构造反演
通过再活化实现多相断层演化是在被动边缘观察到的一种全球性现象。这些结构在石油系统中起着至关重要的作用,为裂谷和被动边缘运动学提供了重要的约束条件,在某些情况下,还可作为远场应力的全球标记。尽管再活化断层具有重要意义,但人们对它们的运动演变、存在、范围以及断层群内部的相互作用的了解往往有限。这凸显了进行全面研究的必要性,包括考虑这一过程中的晕动现象。本研究对加拿大新斯科舍近海佩诺布斯科特三维地震反射勘探中发现的中继斜坡进行了构造解释。该斜坡的特点是有两条主要的 SSE 倾斜断层,同时伴有较小的逆断层和合成正断层,总体走向为 ENE-WSW。两条主要断层在其下部有反向变形的迹象,在其上部则过渡为正常偏移。较小的断层主要影响较年轻的地层,没有重新激活的迹象。断层抛掷分析表明,在逆向和正向变形期间,主要断层都发生了耦合运动。结构分析表明,这些结构最初因晕动而形成逆断层,随后在盐向海洋迁移过程中被重新激活。大西洋边缘半蠕动的时间与之前记录的大规模运动重组时期大致吻合,这表明类似的运动事件引发了佩诺布斯科特地区的盐运动。观察到的深度运动二分法至关重要,它突出了在地震数据只能捕捉到近地表结构的地区,多相变形的潜在监督作用。认识到盐在运动再活化中的作用至关重要,它可以解释反演现象,并在全球范围内产生具有重要经济意义的圈闭结构。这项研究表明,被动边缘结构的再活化可能比之前认识到的更为普遍,尤其是在地震数据只能捕捉到结构上部的情况下。
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来源期刊
pure and applied geophysics
pure and applied geophysics 地学-地球化学与地球物理
CiteScore
4.20
自引率
5.00%
发文量
240
审稿时长
9.8 months
期刊介绍: pure and applied geophysics (pageoph), a continuation of the journal "Geofisica pura e applicata", publishes original scientific contributions in the fields of solid Earth, atmospheric and oceanic sciences. Regular and special issues feature thought-provoking reports on active areas of current research and state-of-the-art surveys. Long running journal, founded in 1939 as Geofisica pura e applicata Publishes peer-reviewed original scientific contributions and state-of-the-art surveys in solid earth and atmospheric sciences Features thought-provoking reports on active areas of current research and is a major source for publications on tsunami research Coverage extends to research topics in oceanic sciences See Instructions for Authors on the right hand side.
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