Seismic stratigraphy of the Klints Bank east of Gotland (Baltic Sea): a giant drumlin sealing thermogenic hydrocarbons

Schaefer Wiebke; Huebscher Christian; Sopher Daniel

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Seismic stratigraphy of the Klints Bank east of Gotland (Baltic Sea): a giant drumlin sealing thermogenic hydrocarbons

机译：克林斯银行克林斯银行（波罗的海）东部地震地层：巨型鼓封装热碳氢化合物

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This work analyses six high-resolution multi-channel seismic profiles across the Klints Bank east of Gotland. The Klints Bank consists of a drop-shaped increase of the Quaternary thickness and is oriented in an approximately north-southern direction with a length of over 50 km, a width of about 15 km and a maximum thickness of 150 m. The glacial origin of the Klints Bank can be verified with the dataset presented in this study. We classify the feature as a (giant) drumlin due to its steep up-ice and tapered down-ice face in combination with an orientation parallel to the ice-flow direction of the Weichselian glaciation. The seismic image of the internal structure of the Quaternary unit shows no uniform stratification or deformation patterns; instead, local sub-parallel reflection patterns interlayered with transparent units are observed. The averaged seismic velocity of this unit is about 2000 m/s, which is interpreted as an autochthonous deposition of glaciogenic sediments. Signs of overprinting are interpreted based on the geometry of the flanks of the structure, which appear mostly in the form of collapse structures and lifted blocks due to compressional thrust faulting. Phase-reversed events within and beneath the Quaternary are perceived as strong evidence of fluid (hydrocarbon) presence within the Klints Bank. Organically enriched Palaeozoic shales in south-easterly direction of the Klints Bank presumably give the origin of these thermogenic hydrocarbons.

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来源
《Geo-marine letters》 |2021年第1期|共15页
作者
Schaefer Wiebke; Huebscher Christian; Sopher Daniel;
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作者单位

Univ Hamburg Inst Geophys Bundesstr 55 D-20146 Hamburg Germany;

Univ Hamburg Inst Geophys Bundesstr 55 D-20146 Hamburg Germany;

Geol Survey Sweden SGU Box 670 S-75128 Uppsala Sweden;

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原文格式 PDF
正文语种 eng
中图分类海洋学;
关键词
Seismic stratigraphy; Drumlin formation; Gotland; Hydrocarbon indicators; Glaciogenic sediments; Quaternary evolution; Baltic Basin;

机译：地震地层;鼓林地层;葛兰;碳氢化合物指标;冰川原沉积物;第四纪演变;波罗的海盆地;

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Seismic stratigraphy of the Klints Bank east of Gotland (Baltic Sea): a giant drumlin sealing thermogenic hydrocarbons

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