STRUCTURAL FEATURES AND EVOLUTION OF VIKING GRABEN IN THE NORTH SEA
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摘要: 北海盆地为典型的中生代裂谷盆地,维京地堑为其内部最具特征的陆内裂谷之一,其构造特征及演化过程具有非常好的代表性。综合IHS、USGS等资料,对维京地堑的基底、断裂、圈闭等构造特征进行了分析总结,并论述了三叠纪与晚侏罗世至早白垩世2个时期的断裂作用。断裂作用产生的掀斜断块构造圈闭及后期的反转构造圈闭、压实披覆构造圈闭等,都深刻影响了油气的形成与分布。根据其构造演化与沉积发育特征归纳为5个演化阶段:前裂谷阶段;裂谷阶段Ⅰ期;热坳陷阶段Ⅰ期;裂谷阶段Ⅱ期;热坳陷阶段Ⅱ期。Abstract: The Viking Graben is a classic Mesozoic rift basin with typical tectonic features and evolutionary history in the North Sea Basin. Using the data from IHS, USGS, we studied the basement, faults, traps and other geological features of the basin as well as the rifting history during Triassic and the period from Late Jurassic to Early Cretaceous. Traps formed by the rifting-caused tilted fault block, and the traps formed by inversion structure and compaction-drape strongly affect the formation and distribution of hydrocarbon. According to the tectonic evolution and sedimentation history, the basin has passed 5 phases of evolution:(1)pre-rift phase; (2) phase Ⅰ of rifting; (3) phase Ⅰ of the thermal subsidence; (4) phase Ⅱ of the rifting; and (5) phase Ⅱ of the thermal subsidence.
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Key words:
- North Sea Basin /
- Viking Graben /
- rifting /
- traps /
- tectonic evolution
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