Mesozoic structural evolution of the UK Southern North Sea: insights from analysis of fault systems
Mesozoic structural evolution of the UK Southern North Sea: insights from analysis of fault systems
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英国南北海的中生代结构演化：断层系统分析的见解
DOI：
10.1144/0041269
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
T. Arthur
中科院分区：
文献类型：
--
作者：
T. Arthur
了解英国北海南部的中生代断层系统对于模拟烃源岩和储集岩的埋藏历史、确定二叠纪和更早地区构造圈闭的形成时间以及绘制中生代岩石的地震速度场以进行准确的时间到深度转换非常重要。通过检查几个具有不同运动量的断层并分析断层模式，可以了解北海南部中生代断层系统的演化。已在选定的区域进行了结构分析，这些区域因盐运动而引起的并发症较小。局部断层分析通过区块 49/28、48/23 和 48/11 的平衡截面和地图进行说明。研究表明，断层在侏罗纪和早白垩世期间是活动的伸展断层，但在白垩纪晚期和第三纪的沉降和隆起阶段通常仅经历了有限的运动。中生代断层通过 Zechstein 蒸发岩的滑脱作用与基底二叠纪和石炭纪岩石分离，并通过转换带连接起来，形成盆地范围的断层系统。中生代断层系统位于前 Zechstein 岩石的薄弱带之上，但并不直接与其相连，因此它们的方向是由中生代力而不是预先存在的结构颗粒控制的。
An understanding of the Mesosoic fault systems in the UK Southern North Sea is important in modelling the burial history of source and reservoir rocks, in determining the time of formation of structural traps in the Permian and older section and in mapping seismic velocity fields in Mesozoic rocks for accurate time to depth conversion. The evolution of Mesozoic fault systems in the Southern North Sea can be understood by examination of several faults with different amounts of movement across them, and by analysis of fault patterns. Structural analysis has been undertaken in selected areas where complications due to salt movement are minor. Local fault analysis is illustrated by balanced cross-sections and maps from Blocks 49/28,48/23 and 48/11. The faults studied are shown to have been active extensional faults during the Jurassic and early Cretaceous, but have in general undergone only limited movement during later Cretaceous and Tertiary phases of subsidence and uplift. The Mesozoic faults are detached from basal Permian and Carboniferous rocks by decollement in the Zechstein evaporites and are linked by transfer zones to form a basin-wide system of faults. Mesozoic fault systems overlie zones of weakness in pre-Zechstein rocks, but are not directly connected to them, so their orientation is controlled by Mesozoic forces rather than pre-existing structural grain.