Study Of The Faults’ Characteristics And The Hydrocarbon Accumulation Model In Qingxi Area

Geological data, geophysicsinformation, geochemical datum and previous achievements and the analysis of the basic characteristics of hydrocarbon reservoirs wereall applied in this thesis. We emphasized on the study of the fault activity and sealing feature, studied the relationship between fault and hydrocarbon distribution, build the hydrocarbon accumulation model for this area and point the potential area.Qingxi Area include Yonganzhen Oil Field and Xinlicun Oil Field, The oil in Yonganzhen Oil Field shows a planer distribution while the oil in Xinlicun Oil Field shows a block distribution and are mainly fault block reservoirs and fault-nose reservoirs. The relative density of the surface oil in Qingxi Area is between 0.87-0.93, the range of velocity is relatively large, it is high in sulfur content.Through the study we found that there are seven source faults in Qingxi area. The migration capability of different faults and different structural positions are various: fault 1 and fault 5 are most stronger in migration capacity, fault 3and fault 7 are relatively stronger while fault 2、fault 6 and fault 4 are relatively weaker. The southwest part of the study area accounts for 46%, Yonganzhen area accounts for 30% while Xinlicun area accounts for 24% of the migration ability. The explorated oil and gas are mainly distributed in the favorable traps near source rocks. The oil of Es4 in Yonganzhen is migrated from the Es4 s source rocks by fault 6 and fault 7 while the oil of Es2 is migrated from the source rocks of Es4s、Es3x by fault 5. The oil of Es2 in Xinlicun is migrated from the Es4 s source rocks by fault 2 and fault 3。Based on the source and the hydrocarbon migration feature, it can be divided into internal source-sand conduction-lateral migration hydrocarbon accumulation model and external source fault conduction vertical migration hydrocarbon accumulation model. The place where Yong97 well develops in Xinlicun Area shows abnormity which is in fan shape, while there is a stripped abnormity in Yong101-Yong112 area, which are the potential area.