A Study On Fault Characteristics And Controlling Reservoirs In Linbei Area Of Huimin Depression

The Linbei area is located at the eastern end of the Linyi fault in the central uplift of the Huimin sag,dividing the Zizhen depression and the Linnan depression.The Linbei area experienced multi-phase tectonic movements,and the faults were extremely developed,formed a series of complex small fault blocks,which made the structures of research area become complex,which brought difficulties for further exploration.This paper aims to analyze the distribution characteristics and formation and evolution of faults in the Linbei area,summarize the identification signs of small and micro faults,and conduct a closed evaluation of faults of different scales and properties to analyze the hydrocarbon accumulation law in this area.This study mainly uses high-precision 3D seismic data,combined with well data,finely interprets seismic profiles,small micro-fault identification methods and signs,analyzes structural features and fracture space combination patterns in the Linbei area,and restores the eastern end of the Linshang fault.The tectonic evolution process,to explore the nature of faults of various scales,and then use the targeted sealing evaluation method to quantitatively evaluate the sealing of faults.Finally,combined with the characteristics of fluid migration and typical reservoir anatomy,analyze and establish oil and gas in Linbei area.Migration and accumulation mode.The final research shows that the north area has a combination of parallel,geese,oblique,braided,comb-like combinations,as well as stepped,mantle,reverse "Y",multi-level "Y" The combination of glyphs and other sections;the main identification marks of small and micro faults are: slight misalignment of the same phase axis,bifurcation and merging of the same phase axis,slight deflection of the same phase axis,blank band appearing on the same phase axis,and the same phase axis is discontinuous;The attribute body is identified.Through the study of balanced section fabrication and structural physics simulation,it is found that the large faults in the Linbei area were formed before the sedimentation of the Sha 3 Member,and they experienced the strike-slip movement of the Tanlu fault zone and the north-south extensional motion of the Paleogene.Nature;small faults in the Linbei area are formed after the second member of the Shahejie Formation.The small faults are divided into two parts according to the trend.The formation of some faults is controlled by the activity of the Linshang fault zone,which has the nature of strike-slip and its derived or associated structure.The trend is mostly northeastward;the other part is a small fault formed by the north-south stretching,and the direction is mostly east-west.Through the results of closedness evaluation of SGR,F,Rm,IFT and SSGR developed for torsional faults,it can be seen that the fault sealing property in the north area is gradually improved from south to north and from east to west.The fault sealing is better than the tensile fault,and the deep is better than the shallow.A poorly closed fracture becomes a channel for oil and gas migration.A well-closed fracture hinders oil and gas migration and has the conditions for forming a reservoir.In the region,it mainly summarizes the lateral,vertical and composite migration modes as well as the “one” type,“multi” type,“Z”type and “Zi” type accumulation model,with two oil and gas advantages.Move direction.