| Based on the abundant basic data and achievements, combined application thetheory and methods abaut petroleum-geology,oil-geochemical,sedimentology,drilling,logging and so on. through the research of tectonic feature and evolution , oilgeochemical,source rock characteristic, petroleum source correlation and hydrocarbonaccumulation, we consider that the main source rocks of Liaoxi depression are Es3segment ,the secondary source rocks are Es1 segment, Ed3 segment.The north seg isbetter than the middle seg from the organic matter,the oranic abundance,the orgnicmaturity.We consider that there is rich oil reserve in JZ25-1(S). In longitudinaldirection, the main oil-layer are Ed3 segment,Es2 segment and Es3 segment the oil-gasreserve of the Es1 segment and Es4 segment is relatively small,they are secondaryreservoir.We found that the crude oil of JZ25-1 area have the same geochemistrycharacteristics with a lower density and lower sulfer content by using the oil-oilcorrelation technique.Comparision of the n-alkane's GC diagrams shows thatodd-even don't appear in the crude oil. the crude oil is maturate,but the oil ofJZ25-1S is materater than the oil of JZ25-1.The source rocks were deposited undersaline water environment.the organic sources main were significant algae ,havinghomology.and the oil of JZ25-1S were biodegraded serious except JZ25-1S-4D.By using the oil–source rocks correlation technique,we think that the oil of thisarea may be originated from Es3 segement of Liaoxidepression.we cann't preclude thecontribution of Es1 segmengt.The main crude oil of JZ25-1S originate from the lowsegment of Es3 and Ed3.The class 2 oil (JZ25-1S-4D)only originate from the lowsegment of Es3 segment. Make use of measurement of enclosure's homogenization temperature,hydrocarbon generation history, we consider that the most important period ofhydrocarbon's migration and accumulation of Es2 segment,Es3 segment is at the finalstage of Dongyingthe Ed1 (26Ma~20Ma).
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