The Research Of Oil And Gas Conduit System Of The Third Series Stratum In The 1st Structure District Of Nanpu Oilfield

By thoroughly analyze the geometry features of faults on the basis of a three dimensional seismic data interpretation of the 1st Structure District of Nanpu oilfield,based on deformation style and strength in the vertical structure divided into three Structural layer(not including the basement):the fault-sinking,fault-saging and depressing.Among them,The bottom boundary of Guantao Group as the boundary is divided into upper and lower sets of the fault system,because of the different deformation period and deformation properties of the fault system,there are some differences about fracture geometry featuresThe three phase of evolution of faults are phase of stretching deformation during the early extensional deformation stages in the second and third sha,strike-slip extensional deformation during the interim period from the first member of sha to Dongying and Late transtensional deformation stage from Guantao to the fourth priod.On this basis divided into six sets of fault systems,that early extensiona fault system,middle extending strike-slip fault system,late transtensional fault system,early extensional extending strike-slip fault system,middle extending strike-slip-late transtensional fault system and early extensional-middle extending strike-slip-late transtensional fault system.There are varies of oil source frature transporting system in the 1st Structure District of Nanpu oilfield,Linear conduit system,y and anti-y conduit system,flower-like conduit system.Frature is the main factor of hydrocarbon migration and accumulation,is an impartant conduit system for hydrocarbon migration.Generally,frature is not only a shortcut channel from deep to shallow,but also closure condition for oil and gas accumulation.Therefore,when the fault activity is strong,the dislocation of cap rock is small,the continuity of the caprock and the effective cover is hardly spoiled,the main to vertical shielding;when the fault activity is enhanced,the caprock is still to have some vertical sealing ability,but oil and gas is in the upper and lower reservoir formation;when breaking completely faults,the original continuity and effective is lost,the oil source is almost vertical tansporting,the oil and gas gathered in the upper reservoir.Defining the extent of destroyed caprock through the caprock effective thick in the study,it shows that the boundary value of the guatao third section is 130?160m though the oil and gas in upper and lower formation.Reservoir sands is almost lateral migration,then sand ratio is an important parameter in reservoir evaluation,can be used for reservoir evaluation?the analysis of source and flat sedimentary micro-facies.Many years of exploration and practice show that,the greater sand ratio,the better reservoir properties,in the similar stratigraphic thickness,the sand ratio can also reflect the continuous of sand body.The relationship between the ratio of the sand and the formation and oil gas display in the typical oil source fault.the basic reserves are located in the arear where the sand ratio is greater than 20%.Accordingly,the evaluation method of fault-sand transporting ratio is builded.Finally,the fault-sand transporting ratio is almost greater than 2 in oil sandstone,the ratio is almost close to 2 in the unoil sandstone,the majority of less than 2.Based on the above,it is established that oil and gas conduit system in the 1st Structure District of Nanpu oilfield,When the effective thickness of the caprock of the Guantao third section is more than 130?160m,the sand ratio is more than 20%in the first section of Dongying formation,oil and gas don't cross the caprock,gather in the first section of Dongying formation.When the effective thickness of the caprock of the Guantao third section is less than 130?160m,the sand ratio is more than 20%in the upper of Guantao formation,oil and gas display in the upper and lower section of the caprock.