Pathway tracing of crude oil filling in Fuyang oil layer, Wangfu Sag, Songliao Basin

Based on the filling pattern of sandstone reservoir,according to the minor variation of crude oil maturity in reservoir,the filling pathway has been traced with maturity contour.The peak of maturity contour refers to the advanced pathway for petroleum migration and filling.4 parameters which are not influenced by other geologic factors have been chosen in the studies of petroleum migration and filling pathway in Fuyang oil layer,Wangfu Sag,including tricyclic terpanes/17α(H)-C₃₀ hopanes ratio,Ts/(Ts+Tm) ratio,C₂₉ sterane ββ/(ββ+αα) ratio,and C₃₀ diahopanes/17α(H)-C₃₀ hopanes ratio.17 samples from Fuyang oil layer have been analyzed,indicating that crude oil maturities all over the Wangfu Sag have the same feature.Well Shuang 32 is the filling point which is close to source kitchen.There are 3 advanced migration and filling pathways in the study region: 1)from well Shuang32 to well Shuang26—Shuang301—Shuang31 in NE direction;2)from well Shuang32,crossing well Shuang38,to well Chang64—Chang11—Chang17 in NWW direction;3)from well Shuang32 to well Shuang231—Shuang23 in NW direction.