晚侏罗世裂谷运动对北海盆地油气富集的控制作用  

LATE JURASSIC-EARLY CRETACEOUS RIFTING IN NORTH SEA AND ITS CONTROL ON HYDROCARBON ACCUMULATION

作　　者：龚建明[1] 雷宝华[1] 李桂海 张生银[3] 廖晶[1] 

机构地区：[1]国土资源部海洋油气资源与环境地质重点实验室,青岛266071 [2]海南省海洋地质调查局,海口570206 [3]中国科学院油气资源研究重点实验室,兰州730000

出　　处：《海洋地质前沿》2012年第3期34-39,共6页Marine Geology Frontiers

基　　金：国家专项"全球油气地质综合研究与区域优选--西北欧海域油气地质综合研究与区域优选"(GT-YQ-QQ-2011-7-23)

摘　　要：为了探讨北海盆地油气富集的控制因素,对前人在该区的大量研究成果进行了整理和分析,结果显示,北海盆地三叉裂谷所在的3个地堑具有上下2层不同的结构特征,即晚侏罗世末期的裂谷拉伸运动造就了北海盆地的下构造层,而早白垩世之后的热沉降作用塑造了北海盆地的上构造层;断层主要分布在下白垩统之下的老地层中。北海盆地油气成藏组合主要受下构造层的控制,成藏模式主要表现为中生代砂岩断—背斜油气藏,因此,可以认为,北海盆地油气富集的主要控制因素是晚侏罗世—早白垩世的裂谷拉伸运动。Controlling factors on hydrocarbon accumulation in the North Sea Basin were studied in this paper based on previous research data.It reveals that there is a double-layer structure in the trifurcate rift grabens.The lower layer is a faulting structure formed by the movement of stretch rifting by the end of Late Jurassic,while the upper is a depressed structure formed by the thermal subsidence after Early Cretaceous.Most of the main faults occurs in the strata older than Cretaceous.The plays of hydrocarbon accumulation are Mesozoic fault-anticline sandstone controlled by the lower rift structure.Therefore,the rift stretching during Late Jurassic-Early Cretaceous is the main controlling factor to hydrocarbon accumulation.

关 键 词：晚侏罗世 裂谷运动 油气富集 北海盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探]