使用地震建模和巴伦支海Snøhvit油田的数据研究断层的PS地震成像

IF 1.9 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Petroleum Geoscience Pub Date : 2021-12-02 DOI:10.1144/petgeo2020-044
J. Cunningham, W. Weibull, N. Cardozo, D. Iacopini
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引用次数: 0

摘要

将Snøhvit油田的PS地震数据与地震建模进行比较,以了解方位角分离和入射角对断层和相关层位不连续性成像的影响。此外,还分析了断层背向散射地震波的频率含量。研究区域由一个地垒结构组成,该地垒结构由一个北西倾斜的北部断层和一个南部倾斜的SSW断层界定,该断层与调查方向大致平行。由于PS反射的射线路径不对称性,与接收器从震源向上倾斜的E数据相比,通过方位角分割的W数据(包括接收器相对于震源的向下倾斜)可以更好地对北部断层进行成像。部分叠加数据显示,随着入射角的增加,PS断层反射振幅系统性增加,因此断层成像质量也随之增加。断层图像以内部中低频率阴影为主,阴影周围为中高频光晕。综合实验表明,这是由于镜面波和衍射的相互作用,以及断层信号的光谱贡献,而断层信号的频谱贡献随着断层带的复杂性而增加。这些结果突出了测量几何形状和处理工作流程对断层成像的影响。补充材料:模型描述、处理部分和视频可在https://doi.org/10.6084/m9.figshare.c.5727552
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Investigating the PS seismic imaging of faults using seismic modelling and data from the Snøhvit field, Barents Sea
PS seismic data from the Snøhvit field are compared with seismic modelling to understand the effect of azimuthal separation and incidence angle on the imaging of faults and associated horizon discontinuities. In addition, the frequency content of seismic waves backscattered from faults is analysed. The study area consists of a horst structure delimited by a northern fault dipping NW and oblique to the east–west survey orientation, and a southern fault dipping SSW and subparallel to the survey. Due to the raypath asymmetry of PS reflections, the northern fault is imaged better by azimuthally partitioned W data that include receivers downdip of the fault, relative to the sources, than by E data where the receivers are updip from the sources. Partial stack data show a systematic increase in the PS fault-reflected amplitude and therefore quality of fault imaging with increasing incidence angle. Fault images are dominated by internal low-medium frequency shadows surrounded by medium-high frequencies haloes. Synthetic experiments suggest that this is due to the interaction of specular waves and diffractions, and the spectral contribution from the fault signal, which increases with fault zone complexity. These results highlight the impact of survey geometry and processing workflows on fault imaging. Supplementary material: model description, processed sections and videos are available at https://doi.org/10.6084/m9.figshare.c.5727552
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来源期刊
Petroleum Geoscience
Petroleum Geoscience 地学-地球科学综合
CiteScore
4.80
自引率
11.80%
发文量
28
审稿时长
>12 weeks
期刊介绍: Petroleum Geoscience is the international journal of geoenergy and applied earth science, and is co-owned by the Geological Society of London and the European Association of Geoscientists and Engineers (EAGE). Petroleum Geoscience transcends disciplinary boundaries and publishes a balanced mix of articles covering exploration, exploitation, appraisal, development and enhancement of sub-surface hydrocarbon resources and carbon repositories. The integration of disciplines in an applied context, whether for fluid production, carbon storage or related geoenergy applications, is a particular strength of the journal. Articles on enhancing exploration efficiency, lowering technological and environmental risk, and improving hydrocarbon recovery communicate the latest developments in sub-surface geoscience to a wide readership. Petroleum Geoscience provides a multidisciplinary forum for those engaged in the science and technology of the rock-related sub-surface disciplines. The journal reaches some 8000 individual subscribers, and a further 1100 institutional subscriptions provide global access to readers including geologists, geophysicists, petroleum and reservoir engineers, petrophysicists and geochemists in both academia and industry. The journal aims to share knowledge of reservoir geoscience and to reflect the international nature of its development.
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