Main controlling factors and hydrocarbon accumulation model of Carboniferous reservoir in Chepaizi Uplift,Junggar Basin
Using seismic,logging,oil test,core,casting thin,physical property analysis and physical simula-tion experiments,the configuration relationship of hydrocarbon accumulation elements,enrichment law research and main controlling factors of hydrocarbon accumulation of Carboniferous reservoir in Chepaizi Uplift of Junggar Basin were discussed.The results show that:(1)The reservoir lithology in the study area is mainly tuff,andesite and breccia,and the reservoir space is mainly secondary pores and fractures.The porosity mostly less than 8％,and the permeability is concentrated in 0.1-10.0 mD,which belongs to ultra-low porosity and ultra-low perme-ability reservoir.(2)The enrichment,migration and accumulation elements of the reservoir are controlled by the union of three elements of"fault-reservoir-shell":Deep and large faults are the channel of vertical migration of oil and gas;Weathering and leaching can improve reservoir physical properties and provide effective storage space for oil and gas enrichment;The Carboniferous itself and its overlying mudstone are generally relatively tight,form a good reservoir-cap combination with the fracture volcanic reservoirs;The configuration relation-ship between strike-slip faults and cap rocks plays an important role in controlling the vertical and lateral migra-tion of oil and gas.(3)It is concluded that the reservoirs in the study area as a whole have the characteristics of"dual source hydrocarbon supply,multi-system transport,multi-type caprock,multi-layer oil-bearing,multi-reservoir type,and compound oil-bearing area".There are significant differences in reservoir accumulation models in different regions and different depths.Horizontally,the near source is"fault blanket transport,lateral filling,near source weathering crust accumulation model",and the far source is"dual source hydrocarbon supply,multiple transport types,hard shell sealing,far source fault shell accumulation model".Vertically,the shallow part is"dual-source hydrocarbon supply,multiple transport types,hard shell sealing,shallow weathering crust accumulation mode",and the deep part is"dual-source hydrocarbon supply,fault transport,tight rock sealing,deep fault body accumulation mode".
volcanic reservoirphysical simulationdeep and large faultsweathering and leachingdual source hydrocarbon supplyCarboniferousChepaizi UpliftJunggar Basin
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