Pressure variations in the northern part of the Danish Central Graben, North Sea

IF 1.9 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
O. V. Vejbæk
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引用次数: 2

Abstract

The overpressure variation in the Cenozoic–Jurassic succession in the northern part of the Danish Central Graben may broadly be divided into three major compartments. An upper hydrostatically pressured unit comprises the post-mid Miocene–recent succession down to c. 1200 m depth in the northern and c. 700 m in the southern parts of the Danish Central Graben. The second compartment comprises the mid-Miocene smectite-rich clays down to and including the upper Cretaceous chalk. There the Paleogene–Lower Miocene succession provides the seal. The third compartment constitutes the Jurassic succession with pressure above hydrostatic that may exceed twice that seen at the upper Chalk level. Pressure levels can be estimated using the Eaton approach for the second compartment that are in agreement with pressure data. Modelling of the transient pressure development in the Cretaceous–mid-Miocene succession broadly complies with the Eaton estimates and shows that the main overpressure build-up has occurred within the last 10 myr. The overpressure in this succession may be mapped using methods that exploit correlations between fluid pressure and the degree of consolidation, while that in the Jurassic cannot. However, the lateral variation in the Upper Jurassic overpressure correlates broadly with the maturity of the Upper Jurassic source rock, allowing the pressure variation to be mapped. Thematic collection: This article is part of the Geopressure collection available at: https://www.lyellcollection.org/cc/geopressure
北海丹麦中央地堑北部的压力变化
丹麦中央地堑北部新生代-侏罗系超压变化大致可分为三个主要区室。上部静水压力单元包括后中新世-最近的层序,下至约1200年 北部深度m,约700 m位于丹麦中央地堑的南部。第二个隔室包括中新世中期富含蒙脱石的粘土,一直到上白垩纪白垩系。在那里,古近系-下中新世序列提供了印章。第三个隔室构成了侏罗纪序列,其压力高于静水压力,可能超过Chalk上层的两倍。可以使用Eaton方法对第二个隔间的压力水平进行估计,该方法与压力数据一致。白垩纪-中新世中期序列的瞬态压力发展模型大体符合Eaton的估计,并表明主要的超压形成发生在过去10年内 myr。该层序中的超压可以使用利用流体压力和固结程度之间相关性的方法绘制,而侏罗系则不能。然而,上侏罗纪超压的横向变化与上侏罗纪烃源岩的成熟度密切相关,从而可以绘制压力变化图。专题收藏:本文是地质压力收藏的一部分,可在:https://www.lyellcollection.org/cc/geopressure
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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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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