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Application of Multi-well Subsidence Analysis of the beryl embayment,Viking Graben,Northern North Sea

Acta Geologica Sinica(English Edition) 2006年第5期80卷 693-704页

作者： DOU Lirong Jon D. TURNER Roger A. SCRUTTON China National Oil and Gas Exploration and Development Corporation CNPC Beijing 100034 China Department of Geology ＆ Geophysics The University of Edinburgh Edinburgh EH9 3JW Scotland UK

The beryl embayment is situated at the south end of the North Viking Graben in the North Sea. Three sets of normal faults, with N-S, NW-SE and NE-SW orientations, have been recognized in the beryl embayment. High-resolution subsidence analysis of 73 wells, combined with some seismic data, has been used to document Middle to Late Jurassic subsidence patterns in this area. The high temporal resolution achieved （1 to 2 million years per data point） has also allowed an assessment to be made of temporal evolution of faults with different orientations, and a study made of how and when the East Shetland Fault was linked and controlled sedimentary facies distributions. The results indicate that the East Shetland Fault can be divided into northern and southern parts which were linked together during the Early-Mid Oxfordian. The Mid-Late Jurassic syn-rift phase can be divided into four stages： minor active extension stage during the Bathonian-Middle Callovian, early syn-rotational stage during the Late Callovian-Early-Mid Oxfordian, syn-rotational climax stage during the Late Oxfordian-Early Volgian, and late syn-rotational stage during the Mid-Late Volgian. The results also show that there was a sequential variation of extension direction of active normal faults with different orientations, with an overall shift in the dominant orientation of active normal faults from N-S in the Bathonian-Middle Oxfordian, through NNW-SSE in the Late Oxfordian-Early Volgian （≈N30°E）, to NW-SE （≈N45°E） in the Mid-Late Volgian.

关键词： high-resolution subsidence analysis normal fault rift basin beryl embayment Viking Graben

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