挪威中部陆架油气地质特征及勘探潜力

以收集到的挪威中部陆架最新地质基础资料和油气田资料为依据,归纳总结该区的烃源岩、储集层、生储盖组合及油气运移特征,分析其勘探潜力,为相关公司介入本区的油气勘探提供依据。综合研究结果认为,挪威中部陆架烃源岩主要为下侏罗统re组三角洲平原相泥页岩及煤层和上侏罗统Spekk组海相泥页岩,其中上侏罗统Spekk组海相泥页岩是主力烃源岩;储层主要为白垩系—新近系浊积砂岩和中侏罗统裂谷期Fangst群滨浅海相砂岩,其中主力储层为中侏罗统裂谷期滨浅海相砂岩;发育裂谷期下生上储(正常)和上生下储两种组合模式;油气通过裂缝、疏导层及断层等作短距离汇聚,通过地层不整合面或连通砂体作长距离运移。该区油气成藏条件优越,资源潜力巨大,储量约为73×108桶油当量,待发现油气田约36个,随着油气勘探的逐步展开,挪威中部陆架必将还有重大油气发现。

Petroleum geology and exploration potential of Mid-Norway continental margin

On the basis of synthesizing regional geologic information and the earlier researches of the Mid- - Norway Continental Margin，we summarized the hydrocarbon source rock，reservoir，source- reservoir- caprock as- semblage and petroleum migration characteristics，analyzed its exploration potential，and provided basis for related company involved in the petroleum exploration in this area． The authors found that the main source rocks occurred in the Lower Jurassic deltaic shale of Are Formation and the Upper Jurassic marine shale of Spekk Formation， where the Upper Jurassic marine shale is considered to be the major source rocks． The reservoirs are found in turbidity sandstone of Cretaceous- - Neogene and shallow marine sandstone of Fangst Group in the Middle Jurassic rift stage． Shallow marine sandstone of Fangst Group in the Middle Jurassic rift stage is considered to be the main reservoir． This area develops two types of source rock- reservoir- seal assemblages of the rift stage: the below- source rock and above- reservoir，above source rock and below- reservoir． The cracks，grooming，faults are channels for a short distance and the unconformity surfaces or connected sand bodies are channels for a long distance of petroleum migration． The Mid- - Norway Continental Margin is rich in hydrocarbon，its reserves reaches about 7. 3 billion barrels of oil equivalent and the undiscovered fields may be up to 36． With the gradual expanding oil and gas exploration， there is bound to be major oil and gas discoveries．