TECTONIC-SEDIMENTARY EVOLUTION OF JURASSIC IN VIKING GRABEN, THE NORTH SEA
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摘要: 维京地堑侏罗系是主要的生油岩,浅海相砂岩及深水海底扇砂岩是主要的储层,因此,研究其构造沉积演化具有重要意义。从北海维京地堑侏罗纪时期的构造演化入手,研究了构造对于沉积的控制。研究发现,研究区侏罗纪经历了2期构造演化阶段,分别为早—中侏罗世时期的热沉降阶段和晚侏罗世的地壳伸展阶段。热沉降阶段早期发育海相沉积至中侏罗世时期,海相沉积环境逐渐演变为陆相三角洲相沉积体系。地壳伸展阶段发育深水海底扇沉积。根据以上认识,最终建立了2种北海维京地堑侏罗纪构造沉积模型。Abstract: The Jurassic contains the major source rock in the Viking Graben, with shallow-marine sandstones and deep-water submarine-fan sandstones as main reservoirs. Careful study of tectonic-sedimentary evolution is the key to oil and gas exploration. The Jurassic in the Viking Graben could be divided to two phases:Early-Middle Jurassic thermal subsidence and Late Jurassic active stretching phases. In the early stage of the thermal subsidence phase, marine depositional environments prevailed. But in the Middle Jurassic stage it is dominated by a non-marine delta depositional system. In the phase of active stretching, there formed a deep-water submarine-fan system. Based on the facts mentioned above, two tectonic-sedimentary models were established for the Jurassic in Viking Graben of the North Sea.
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Key words:
- Jurassic /
- tectonic-sedimentary evolution /
- Viking Graben /
- North Sea
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