The Study Of Effective Reservoir Characteristics And Prediction For The Glutenite Reservoir In South Of The Shaobo Sub-sag

Sand conglomerate reservoir is an important component for the oil and gas reserves of Gaoyou sag in Jiangsu Oilfield.In recent years,multiple sand conglomerate reservoirs were found in Shaobo and Zhenwu of Gaoyou sag,and achieved better benefit.There is a huge risk of the exploration and development in current oil prices in sand conglomerate reservoirs due to its depth,multivariant lithologic character and complex relationship between lithology and logging,as a result,some potential gas reservoirs were easy to ignore.Carrying out effective reservoir research of sand conglomerate and analyzing the influence factors of effective reservoir have a great significance for the prediction and found of the high quality reservoir of the steep slope sand conglomerate and the success rate of exploration and development.Gaoyou sag is a fault-depression stage during the period of the first member of Dainan formation,which developed the sedimentary system of various phase-band types of the belt around the deep concave zone.In the south of the Shaobo sag,the terrain is relatively steep,the material source is relatively close and the sedimentary are mainly fan delta and nearshore subaqueous fan.In the work area,the effective reservoir of a sand conglomerate reservoir is distributed vertically in reverse cycle,which deposited in the environment of the leading role of the traction flow after the rapid accumulation of gravity flow.The effective reservoir distribution in the plane is controlled by sedimentary phase and the lateral development is discontinuous.Based on the test of oil,electricity,physical properties and other related information in the industrial area,a four-sexual relationship template was established to establish the lower limit of effective reservoir in different areas.Through the analysis of the lower limit and distribution characteristics,lithology,physical properties and diagenesis,the key factors to control the effective reservoir are asfollows: Overall,the lower limit of effective reservoir on the longitudinal has increased with the increase of buried depth gradually reduce the trend,the plane sedimentary facies belt for key factors,such as lithology,diagenesis,reservoir pressure in the secondary role.Effective reservoir prediction methods such as rock physics analysis,four sex research,CRP gathers processing,longitudinal/transverse wave prestack velocity inversion,sandstone thickness/porosity prediction were applied to predict the work area gravel effective thickness and porosity of rock mass and the favorable area for the development of reservoir?...