Research On Sequence Framework In Quantou Layer Of Southeastern Uplift Area

The Quantou layer of the Southeast uplift area has huge prospect potential and the exploration level is low.To research the sequence stratigraphic framework has the important significance for the oil and gas exploration and exploitation.Based on the relevant data of cores, well-log and seismic data on the basis of sequence stratigraphy,seismic straligraphy and sedimentary,this paper analysed the sequence stratigraphic characteristic,studies on the identification of sequence interfaces and the division signs of the sequence stratigraphic and establishes sequence-stratigraphic framework of the Quantou layer and identifies four third-order sequence containsâ…¡2-q1,â…¡2-q2,â…¡2-q3,â…¡2-q4 from bottom to top. Each three-order sequences can be devided into three systerms tracts, they are lowstand systerms tract, transgressive systerms tract and high systems tract,and analyze the characteristics of each three-order sequence and systems tract.On the basis of establishing the stratigraphic framework of the Quantou layer, according to analyses of the core ,well-log,seismic and other facies marks,combined with the single well,alliance well and the plane characteristic,it can be founded that the region mainly developed anastomosed stream and meandering stream,the source direetionwere analyzed systematieally, and the characters of precipitation facies, depositional model and depositional systems distribution of the Quantou layer are defined,and then analysed and evaluated the characters of the sequence stratigraphic framework comprehensively combining the result of sedimentary facies.Combined with structural geology feature of Southeastern Uplift Area,this paper predicts favorable exploration targets by comprehensively considering basic conditions for the formation of reservoir, for example, source bed, reservoir, cap rock and the combination of these,and analysing the exploration result at present. The research will play an important role in guidinging the arrange of the exploration of the oil and gas.