Research On Oil Reservoir Geological Characteristic Of The Es3?Es4 Of The Paleogene In Qingdong Sag,Jiyang Depression

Regarded Petroleum geology,sedimentology,Structural Geology and other disciplines as the theoretical guidelines,the third to fourth member of Paleogene Shahejie Formation in Qingdong Sag,Jiyang Depression was studied as the main target for identifying favorable sand type,evaluating of reservoir quality and inducting reservoir geological characteristic as the fundamental purpose.The structural complexity of Qingdong Sag caused by fault activity makes the stratum lithology and electrical characteristic of Sha 3~Sha 4 member of the Sag unconspicuous and increases the changes in velocity of strata.Thus it is a controversy about stratigraphic division and seismic anxis interpretation in Sha 3~Sha 4 member.Based on the sequence stratigraphic theory and selecting 6 typical wells from more than 30 exploratory wells with abundant data and complete stratums,the dissertation focused on the stratigraphic division of Sha 3~Sha 4member by analyzing their lithology and electrical characteristic,combining with synthetic seismograms.By horizon calibration well data with seismic,clear each standard reflective layer and seismic reflection characteristics of each group of sand,fine interpretation under sub-section of a three sand,sand sub-segment four Mesozoic strata 6 sets,explain an area of about 720km~2;implementing of the sub-segments and sub-segments?,?,?,?group sand bottom boundary and stratigraphic distribution;Technology explained more than 100faults by the amplitude of horizontal slices,coherent body,ant-the-like,the preparation of sub-section and sub-section?,?,?,?sand set the lower boundary plane structure Clear Qingdong Sag fault system has complex structural characteristics,consisting of EW,NWW and NEE faults cutting each other staggered composition.Integrated core,well logging,seismic data,combined with the actual drilling and seismic attribute extraction analysis,defined the Qingdong Sag lower of Sha 3~Sha 4 member sedimentary features and reservoir on the plane distribution features.Reservoir space mainly have intergranular pores,intergranular solution pores and intragranular holes.Shahejie overall reservoir properties exhibit high porosity and permeability characteristics.The heterogeneity in Sha 3 member of sand is stronger than Sha 4 member of sand.Sha 3~Sha 4 member of sand are major oil-bearing strata.Four types of reservoirs generated in the Qingdong Sag,including structural,stratigraphic,lithological and composite ones.Based on the above analysis of the final study division separated three favorable zones.