Research On Fine Structure Interpretation And Reservoir Prediction Of Putaohua Reservoir In Block Pu229-1 Of Punan Oilfield

The Pu229-1 block is located in the middle of the Punan oil field.The Puhuahua oil reservoir in the study area is thin and small in scale.It is difficult to use existing drilling and logging data from a single well point to study the situation of interwell sand bodies.Lai Yue is unable to meet today's requirements for fine geological research.Based on this study of fine reservoir prediction and channel boundary determination.In this paper,guided by high-resolution sequence stratigraphy,geology,and other theories,the calibration of the top and bottom of the Puhua oil layer and the Pu I oil layer group is performed,and then the fine stratigraphic division and comparison within the Pu I oil layer group are carried out in the whole region.Drilling-logging-seismic integrated stratum study ensures the reliability of seismic interpretation horizons.The interpretation of faults is based on uphole breakpoints,combined with various technical means such as coherence,slices,and attributes,to ensure the reliability of fault identification.Establish a variable velocity field for time-depth conversion,and analyze the internal structural characteristics of Putaohua oil layer.Under the sedimentary system of the delta front of the large shallow water lake basin in the Putaohua oil layer,based on the principle of sedimentology,through the analysis of well point logging facies model,combined with the analysis results of single well facies,continuous well facies and seismic attributes,the combination of well-seismic was determined The characteristics of sedimentary microfacies in this small layer determine that the Portuguese I4 and Portuguese I5 layers are the vertical main channel reservoir development sections of the Putaohua oil layer,and the sedimentary microfacies of the underwater distributary channel in the central and western study areas are concentrated on the plane.In terms of reservoir prediction,the frequency compensation and reconstruction method is used as the theoretical basis,with low frequency compensation and high frequency recovery as the ideas,and the characteristics of different geological features that can be reflected by different frequency scales of the log curve are used to store the log curve.Layer sensitive parameter analysis,carry out seismic reconstruction inversion.Completed 11small-layer sandstone predicted thickness distribution maps,using reference to the profile of the well and statistical analysis of the post-test error.The post-test sandstone predicted thickness coincidence rate was 83.3%,and the reservoir prediction effect was good.The type of oil reservoir in Putaohua Formation is structure-lithology and lithologyreservoir.Structural traps and dense fault zones control the distribution of oil-rich areas,and structural faults control the development layers of the reservoir.Based on the structural characteristics,reservoir characteristics and reservoir characteristics of the study area,the favorable zones of the Putaohua oil layer in the study area are predicted.