利用重力层剥离法对北海英国段亚zechstein地质构造进行重力成像

IF 1.9 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
J.D. Fairhead, D. Marsden, N.M. Azli, I. Özsöz, D. Maxwell, O. Rose, C.M. Green
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引用次数: 0

摘要

广泛的地球物理数据库覆盖了北海的英国部分,已用于重力层剥离沉积层至Zechstein基底,以便识别石炭纪和更深地层的重力响应并进行结构解释。为了实现这一目标,每一层的平均体积密度网格使用Gardner函数,该函数由井速和密度测井曲线推导而来。将得到的各层残余重力响应和莫霍响应从自由空气重力异常中去除,得到Zechstein基底下地壳的均衡重力响应。这种重力响应被用来重新评估英国地质调查局(BGS)对北海中部高地(MNSH)的解释,并能够识别出相同的地壳结构。利用Tilt导数方法,发现了一个与中央断裂带平行的重力正异常,形成了Dowsing断裂带的北延。该异常可追溯至北跨MNSH,偏移量与WSW-ENE基底线相吻合。在南部,通过地层深度和厚度图以及残余重力图确定了与低密度石炭系煤系相关的构造,北海南部盆地得到了很好的界定。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Gravity imaging of sub-Zechstein geological structures in the UK sector of the North Sea using the gravity layer stripping method
Extensive geophysical databases, covering the UK sector of the North Sea, have been used to gravity layer strip the sedimentary layers down to the base Zechstein so that the gravity response of the Carboniferous and deeper strata can be identified and structurally interpreted. To achieve this, the average bulk density grids for each layer were derived using Gardner's functions derived from well velocity and density logs. The resulting residual gravity response of each layer and the Moho response were then removed from the Free air gravity anomaly to generate the isostatic gravity response of the crust below the base Zechstein. This gravity response was used to re-evaluate the British Geological Survey (BGS) interpretation over the Mid North Sea High (MNSH) and was able to identify the same crustal structures. Using the Tilt derivative method, a positive gravity anomaly was found to parallel the Central Fracture Zone that forms a northern extension of the Dowsing fault zone. This anomaly can be traced north across the MNSH with offsets coinciding with the WSW-ENE basement lineaments. To the south, the southern North Sea basin is well defined by the stratigraphic layer depth and thickness maps as well as the residual gravity maps which identify the structures associated with the low-density Carboniferous Coal Measures.
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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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