A study on the mechanism of gabbros-metamorphic rocks oil reservoir in Chunxi,in Dongying Depression

Aim To analyzze the lithology,lithofacies and organic geochemistry on the source rocks surroundings Chunxi gabbros.Methods It was found that the gabbros not only made the source rocks hydrocarbon generating and ejecting,and also made it become special oil storing stratum,forming a gabbros-metamorphic rocks combined reservoir.Results On the basis of making sure the gabbros activating,its high temperature and pressure standing time,the structural growth history at Chunxi areas and the hydrocarbon generation history of the around sags as well as oil distributing were combined.Conclusion The combined reservoirs' forming process was discussed.In the end,a mode of the combined reservoir was founded.