Petroleum Migration And Models Of Eogene Reservoirs In Yongxin Area, Dongying Sag

With the comprehensive research methods of geology, geochemistry and geophysics, On the ground of diagnosing the basic geologic and structural characteristics of the fault block hydrocarbon reservoir in Yongxin area, the resource of the hydrocarbon, the characteristics of conducting system, the hydrocarbon migration and the model for reservoir-forming are mainly studied. According to the summary of source rock geochemical property in Minfeng sub-sag,Niuzhuang sub-sag and Yongxin area, associating the analysis about the geochemical property of discovered oil(including oil-bearing sand) in Yongxin area,it is judged that the oil in Yong'anzhen oil field is mainly provided by Es4s or the mixture of the Es3 and the Es4s ource rocks in Minfeng sub-sag,and the oil in Xinlicun oil field is mainly from Es4s source rock which has already been up to oil threshold under the area, the oil in the south of Xinlicun oil field is provided by the mixture of the Es4s and Es3x source rocks in Niuzhuang sub-sag. In the longitudinal section,the oil in the oil generative assemblage is mainly provided by the source rock in its own layer, while the oil being not in the oil generative assemblage is mainly from the mixture of the source rocks. The conducting system in Yongxin area is made up of sand bodies and fault, the main framework sand bodies are Es3s,Es2x and Es2s. Second order fault in Yong'anzhen oil field is the main vertical pathway for hydrocarbon migration, while hydrocarbon migrates in vertical. only on the middle of Yong 105 fault in Xinlicun oil field, the little faults in the south are sealing faults, hydrocarbon accumulates because of the assemblage of faults and sand bodies. With the studying of oil and source rock correlation, migration pathway, petroleum migration., three kind of pool-forming models are established: notching migration model, vertical migration model and lateral mingration model. At last, distribution regular of oil and its influential factor are systematic analysis, it is think that the level, activity of faults along with the assemblage of faults and sand bodies have the important effect on the forming and the distribution of petroleum reservoir.