北海外马里福斯盆地构造特征与差异演化机制  

Structural features and differentiated evolution mechanism of the Outer Maray Firth Basin in North Sea

作　　者：尹新义 杨松岭 方勇 马金苹 李培培 贾建忠 YIN Xinyi;YANG Songling;FANG Yong;MA Jinping;LI Peipei;JIA Jianzhong(CNOOC International Limited,Beijing 100028,China)

机构地区：[1]中国海洋石油国际有限公司,北京100028

出　　处：《中国海上油气》2021年第6期71-77,共7页China Offshore Oil and Gas

基　　金：中国海洋石油有限公司综合科研项目“大西洋被动陆缘重点盆地漂移层系油气藏勘探综合评价技术研究(编号:YXKY-2021-ZY-01)”部分研究成果。

摘　　要：基于对北海外马里福斯盆地高精度三维地震资料和大量钻井资料的精细地质-地球物理解释,明确了盆地内的洼陷具有"小而多,差异大"的构造特征。各洼陷整体受"两期三组"断裂控制,南北向洼陷为受南北向和东西向断裂联合控制的晚侏罗世洼陷,东西向洼陷为受东西向断裂控制的晚侏罗—早白垩世洼陷,北西向洼陷为受北西向断裂控制的早白垩世洼陷。盆地内各洼陷间差异演化特征明显,无论是洼陷内还是洼陷间沉降中心均由西向东迁移。盆地内洼陷差异演化的机制为:在地幔柱隆升产生的垂向张应力为主应力的背景下,南北向洼陷的形成主要受先存断裂的影响,北西向洼陷的形成受新特提斯洋扩张影响,东西向洼陷的形成受北大西洋扩张和新特提斯洋扩张的合力影响。Based on the high-precision 3 D seismic data and fine geological-geophysical interpretation of a large amount of drilling data in the Outer Maray Firth Basin of North Sea,it is clarified that the subsags in the basin have the structural features of “small but numerous,and obviously differentiated”.The subsags are controlled by the “two phases and three groups” faults as a whole.The north-south trending sags are the Late Jurassic sags jointly controlled by the north-south and east-west trending faults,and the east-west trending sags are the Late Jurassic-Early Cretaceous sags jointly controlled by the east-west trending faults.NW-trending subsag is an Early Cretaceous subsag controlled by NW-trending faults.The differentiated evolution characteristics of subsags in this basin are obvious,and the subsidence centers of both the subsags and the inter-sags migrate from west to east.The differentiated evolution mechanism of subsags in the basin is:in the context of the principal stress of vertical tensile stress generated by mantle plume uplift,the formation of north-south trending subsags is mainly affected by the pre-existing faults,that of north-west trending subsag is affected by the Neo Tethys ocean expansion,and that of east-west trending subsags is jointly affected by the expansions of both the North Atlantic Ocean and the New Tethys Ocean.

关 键 词：北海 外马里福斯盆地 构造格局 差异演化 成因机制 

分 类 号：TE121.2[石油与天然气工程—油气勘探]