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首页> 外文期刊>Petroleum Geoscience >The complexity of a ramp-flat-ramp fault and its effect on hanging-wall structuring:an example from the Njord oil field,offshore mid-Norway
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The complexity of a ramp-flat-ramp fault and its effect on hanging-wall structuring:an example from the Njord oil field,offshore mid-Norway

机译：缓坡匝道断层的复杂性及其对吊壁构造的影响：以挪威中部离岸的约尔德油田为例

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The Njord oil field of the mid-Norwegian continental margin comprises a hydrocarbon trap structure,which is delineated by segments of master faults with complex geometry.The Vingleia Fault Complex includes the major fault segments that delineate the Njord structure to the southeast and east.Three master fault segments with a change in strike orientation are recognized.Reflection seismic sections reveal that these segments show strong variations in fault plane geometry.The central part is characterized by a pronounced ramp-flat-ramp geometry,which diminishes both southwestward and northeastward,so that the northeastern and southwestern segments have a more listric geometry.Hence,an along-strike profile shows an antiform-like culmination in the master fault surface.To the characteristic deformation of ramp-flat-ramp faults,additional deformation in the Njord Field is obvious and marked by extensional horses,extensive roll-over folding,varying strata rotation,characteristic fault bending and variable influence of synthetic and antithetic faults.The occurrence of the style of deformation and geometrical variations in fault pattern are closely related to the structural position above the detachment fault.The following steps in the development of the Vingleia Fault Complex and the associated deformation of the hanging-wall fault block are proposed.(1)Initiation of the master faults in early Trias sic.This stage was characterized by slow,extensional displacement.The positions of the master fault segments were possibly influenced by basement in homogeneities marked by a magnetic/gravity anomaly.(2)It is likely that the ramp-flat-ramp had already become established at this stage and that the master fault geometry and a proposed weak salt layer promoted this.(3)During accelerating extension in mid to late Jurassic,the master fault segments became connected by one-sided,lateral linking of fault tip and fault plane or by mutual curved linking of the fault tips.(4)Simultaneously,a roll-over anticline developed within the hanging wall of the master fault.Its relatively large amplitude is produced by a differential movement on the fault surface in combination with a dip-parallel shift of the vertical displacement maximum,which is positioned above a change in the footwall dip.
机译：挪威中部大陆边缘的Njord油田包括一个油气藏结构，由具有复杂几何形状的主断层段划定.Vingleia断层构造包括将Njord结构划定到东南和东部的主要断层段.3识别了走向走向改变的主要断层段。反射地震剖面表明，这些断层在断层平面几何中表现出强烈的变化。中央部分的特征是明显的缓降斜坡几何形状，从而减小了西南向和东北向，因此因此东北和西南段具有更陡峭的几何形状。因此，沿走向剖面在主断层表面显示出反形式的高潮。对于缓坡匝道断层的特征变形，Njord场的附加变形为明显且具有伸展性马，广泛的翻转折叠，地层旋转变化，特征性断层弯曲断裂样式的变形方式和几何变化的发生与分离断层上方的构造位置密切相关。Vingleia断裂复合体的发展的后续步骤以及与之相关的变形（1）早期Trias sic主断层的形成。这一阶段的特征是缓慢的，伸展的位移。 /重力异常。（2）在这个阶段很可能已经建立了斜坡-平坦-斜坡，并且主断层的几何形状和拟议的弱盐层促进了这种情况。（3）在侏罗纪中晚期加速扩张期间，主断层通过断层尖端与断层平面的单向，侧向连接或断层尖端相互弯曲的连接而相互连接。（4） ，在主断层的悬挂壁内形成了翻转的背斜。其较大的振幅是由断层表面上的微分运动与垂直位移最大值的垂线-平行位移相结合而产生的，该位移平行于变化上方在底盘倾角。

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