关键词: 东营凹陷, 两相渗流法, 烃源岩, 排烃, 排油浓度, 含水饱和度

Abstract: On the basis of oil-water two-phase percolation theory and factual materials,the compact-expulsion characteristics of source rocks were studied in the upper forth member and the lower third member of Shahejie Formation in Dongying Depression.The variation curves of oil expulsion concentration in source rocks were given,which indicated that oil expulsion concentration was controlled by viscosity of oil,saturation and relative permeability of oil and water in the source rocks.The critical oil saturation for oil expulsion of source rocks was related to those factors.In the early stage,oil expulsion concentration was much less than oil saturation of source rock.The expulsion material was mainly water,despite of the fact that oil saturation was rather high.Oil concentration increased with the burial depth of source rocks.When the burial depth of source rock reached a certain depth,the water saturation in source rocks was nearly equal to the irreducible water saturation,and the oil expulsion concentration was close to 1.The main oil expulsion stage could appear.

Key words: Dongying Depression, two-phase percolation, source rock, hydrocarbon expulsion, oil expulsion concentration, water saturation