Lower Cretaceous deep-water sandstone reservoirs of the UK Central North Sea
Lower Cretaceous deep-water sandstone reservoirs of the UK Central North Sea
复制标题
英国北海中部下白垩统深水砂岩油藏
作者：
S. Garrett;T. Atherton;A. Hurst
北海中部下白垩统深水沉积体系正成为一个重要的经济目标。它包含了广泛的沉积相和建筑。高密度泥沙重力流沉积厚砂。不同寻常的带状和混合泥质相是浊流与泥石流过渡过程的产物。页岩倾向单元显示出泥石流和沉积后的下坡运动的证据。几何建筑元素包括狭窄的线状切割河道、宽阔的线状富砂航道、推进的砂叶和横向扩展的片层。通过岩心磁测量、自动定量岩石学、详细的结构分析和生物地层学分带，可以完善勘探和生产模型。剩下的主要挑战是完善沉积模型，以帮助预测横向相变化，了解圈闭机制和几何形状，以及改进地震数据上砂岩单元的图像。
The Lower Cretaceous deep-water depositional system of the Central North Sea is emerging as a significant economic target. It contains a broad range of sedimentary facies and architecture. Thick sands were deposited by high-density sediment gravity flows. Unusual banded and mixed slurried facies represent the products of processes transitional between turbidity currents and debris flows. Shale-prone units show evidence of debris flows and post-depositional down-slope movement. Geometrical architectural elements include narrow linear incised channels, broad linear sand-rich fairways, prograding sand lobes and laterally extensive sheets. Models for exploration and production are refined by core magnetic measurements, automated quantitative petrography, detailed structural analyses and biostratigraphical zonations. Key remaining challenges are refining depositional models to aid prediction of lateral facies variations, understanding trap mechanisms and geometry and improving images of sandstone units on seismic data.