英国北海“三元”水道沉积模式及储层特征

Sedimentary Model and Reservoir Characteristics of the “Three Group” Channel System in the North Sea of UK

卜范青 杨莉 曹树春 杨宝泉 吕文睿

BU Fanqing YANG Li CAO Shuchun YANG Baoquan Lü Wenrui

中国海油石油国际有限公司, 北京 朝阳 100028

CNOOC International Limited, Chaoyang, Beijing 100028, China

不同类型深水浊积水道体系沉积储层特征存在较大差异。以英国北海G油田P油组限制型深水浊积水道体系为例，采用地震地貌学方法、钻井及岩芯资料，表征水道体系内部储层展布特征；通过薄片及电镜观察，理清北海地区成岩作用对储层的影响。研究认为：1) P油组发育于限制型U形峡谷内，垂向形成典型“三元”水道沉积模式。2)底部A和B砂组为粗粒沉积。最底部A砂组不发育，呈过路不沉积，与下伏地层不整合接触；B砂组为夹杂塑性流的泥质碎屑流；中部C砂组覆盖于整个峡谷，储层品质最好；顶部D砂组为晚期沉积，以泥质天然堤为主。3)4油组物性具上下差、中间好的规律。该项研究不仅对深水沉积学的发展具有较大的理论意义，而且对类似油田勘探和开发具有重要的实际意义。

There are significant differences in the sedimentary reservoir characteristics of different types of deep-water turbidite channel systems. Taking the restricted deep-water turbidite channel system of the P oil formation in the North Sea G Oilfield in the UK as an example, seismic geomorphology methods, drilling and core data were used to characterize the distribution characteristics of the internal reservoirs in the turbidite channel system, and to clarify the impact of diagenesis on reservoirs in North Sea through thin section and electron microscopy observation. Research indicats that: 1) the P oil formation developed within a restricted U-shaped canyon, forming a typical "three group" sedimentary pattern vertically; 2) the bottom A and B sand formation is composed of coarse-grained sediments. At the bottom, the A sand body is not developed and does not deposit, and is in unconformable contact with the underlying strata; the B sand group is a mud debris flow mixed with plastic flow; the central C sand formation covers the entire canyon and has the best reservoir quality; the top D sand formation is a late stage sedimentation, mainly composed of natural mud embankments; 3) the upper and lower oil groups do not have good physical properties but the middle group does. This study not only has significant theoretical implications for the development of deep-water sedimentology, but also has important practical significance for the exploration and development of similar oil fields.

10.11885/j.issn.1674-5086.2024.09.02.05