Research On The Diagenetic Evolution In Sequence Stratigraphic Framework In The Steep-slope Zone Of Halfgrabe-like Rift Basin

Based on the research fruit of predecessor,directed by the sedimentation theory, Sequence Stratigraphic theory and diagenesis theory.based on the research of structure, sedimentary and Sequence Stratigraphic in the steep-slope zone of dongying sag.combi -ning with the body of casting slice,stereoscan photograph,x-diffraction,reflectance of vitrinite atc.combing with the research of the Sequence Stratigraphic,writer detailed researched the diagenesis of shahejie formation in the steep-slope zone of dongying sag.included the reaearch of diagenesis,digenetic evolution phase,digenetic evolution, digenetic facies and relation of digenetic evolution and reservoir in in Sequence Stratigraphic Framework.there are main conclusions and views as follow:Based on the research production of predecesser,writer researched Sequence Stratigraphic.the There are 3 second-order Sequence interface(SSB1,SSB2,SSB3)and 3 third-order Sequence interface are discoveried in shahejie formation.There are 2 second-order Sequence(Es4 and Es3～Es2~下)and third-order Sequence(SQ1,SQ2,SQ3, SQ4,SQ5,SQ6)are distinguished from the shahejie formation.and wirter established the Sequence Stratigraphic Framework.Background of the structurual evolution,sedimentary and Sequence Stratigraphic. based on the body of casting slice,stereoscan photograph and x-diffraction atc.wirter detailed researched the diagenesis in Sequence Stratigraphic Framework.included the compaction-pressure solution,cementation of carbonate,secondary oversize of quartzes,cementation of clay minerals,cementation of iron pyrites,cementation of anhydrite replacement and erosion atc.and detailed researched the diagenesis of the sequence interface,erosion,cementation of carbonate,cementation of clay minerals are found near the the sequence interface.researched the diagenesis in the system tracts, cementation of carbonate,cementation of clay minerals,cementation of kaolinite,cementation of anhydrite are found in the low system tracts,secondary oversize of quartzes, cementation of anhydrite,compaction of mud stone are fund in the expand system tracts; cementation of carbonate,cementation of feldspar,erosion are found in the high system tracts.researched the digenesis of the sedimentary system in the sequence.Different sedimentary system include different diagenesis.The diagenesis influenced the alluvial fan reservoir include the cementation of clay minerals and erosion;The diagenesis influenced the fan-delta reservoir include the compaction,cementation of carbonate and secondary oversize of quartzes;The diagenesis influenced the Nearshore Subaqueous Fans reservoir include the compaction,secondary oversize of quartzes and cementation of carbonate;The diagenesis influenced the delta reservoir include the compaction, secondary oversize of quartzes and erosion;The diagenesis influenced the turbidite fan reservoir include the cementation of carbonate and erosion.Based on the research of diagenesis,according to character of diagenesis substance, clay minerals analyse,reflectance of vitrinite atc.Wirter divided the phase of the Diagenetic Evolution.including subphaseA,B of early stage diagenesis and subphase A,B of late stage diagenesis.And detailed researched the process of the Diagenetic Evolution.Based on the research of phase of the Diagenetic Evolution and Diagenetic Evolution.The paper detailed divided the digenetic facies of the shahejie formation. there are 5thdigenetic facies and 8th digenetic subfacies in the shahejie formation. 5thdigenetic facies include the early stage feebleness compaction,early stage feebleness cementation,indermediate stage erosion,indermediate stage again cementation and advanced stage tightness cpmpation.8th digenetic subfacies include erosion of plastic nature component,cementation of calcite,cementation of carbonate including Fe,secondary oversize of quartzes,cementation of kaolinite,cementation of clay minerals, cementation of asphalt and cementation of anhydrite.then researched the digenetic subfacies in the Sequence Stratigraphic Framework of shahejie formation in the steep-slope zone of dongying sag.in the end,wirter established the synthesis model of diagenesis of the steep-slope zone of halfgraben-like rift basin.Diagenesis partly control the reservoir.included the compaction,cementation and erosion.the paper quantify counted the Diagenesis by the Diagenetic aggregative index number.and pramilinary discussed the relation of the Diagenetic aggregative index number and the reservoir.the research indicate,there are corresponding relation between the Diagenetic aggregative index number and the reservoir.