Genesis of Tilted Oil-Water Contact of Heavy Oil Reservoir in Shawan Formation,Chunfeng Oilfield,Junggar Basin
The oil-water relationship of the heavy oil reservoir in the first member of the Neogene Shawan formation(Sha 1 member)in Chunfeng oilfield is complex and cannot be explained from the traditional viewpoint of oil-water contact(OWC),which affects the explora-tion and development process of the oilfield.Taking the P601-20 block with prominent contradiction in oil-water relationship as an exam-ple,researches on seismic-geology and pool-forming dynamics were conducted,and combining with the reservoir performance during devel-opment,the oil-water relationship of the heavy oil reservoir in Sha 1 member and its genesis were analyzed.It is found that the complex oil-water relationship in this oilfield is caused by the presence of a tilted OWC in the reservoir which is a structural-lithological reservoir with bottom/edge water.In terms of reservoir physical property,fault,formation pressure,tectonic movement,etc.,the presence of the tilted OWC should be attributed to the adjustment of the reservoir due to tectonic movements,and the crude oil densification and flat strata inten-sified the lag of OWC adjustment.This reservoir can be classified as an unsteady oil and gas reservoir.
Junggar basinChepaizi swellChunfeng oilfieldShawan formationheavy oil reservoiroil-water relationshiptilted oil-water contactunsteady oil and gas reservoir
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