Reservoir Prediction And Outward Expansion Favorable Area Prediction Of G Oilfield In Songliao Basin

The G oilfield in the study area is located in the south of daqing placanticline structure,and has entered the middle and late development stage.The infilling adjustment inside the oilfield and the effective development of the edge area of the oilfield have become an important way to increase production and increase reservoir of the old oilfield.To solve this problem,the first is to further implement the development and distribution of the reservoir in the whole area,and the other is to clarify the structure and oil and water distribution of the edge area,so as to optimize the favorable area for expansion and provide a basis for the rational development of the edge area.To solve the above problems,based on the theories of tectonic geology,sequence stratigraphy,sedimentology and geophysics,fine well seismic calibration was carried out in this paper.The framework interpretation profile was established by combining seismic profile with 3D visualization,and the interpretation of four seismic horizons in the study area was completed step by step.Combined with well breakpoints and guided by seismic attributes such as coherence body,dip Angle attribute and curvature body,fault interpretation of seismic section is carried out.A total of 91 faults and plane combination are completed.The structural maps of four structural horizons in the study area were drawn and their structural characteristics were analyzed by using variable speed mapping technique.Further,the sedimentary environment and sedimentary facies types of G oilfield were analyzed,and one type of facies,two types of subfacies and four types of microfacies were identified.The logging microfacies model of the study area was established and the distribution characteristics of 15 small layers of sedimentary facies were determined.Based on the geological characteristics of seismic attribute sensitivity analysis in the study area,optimizing amplitude,90 ° properties,phase transformation,the frequency in dilute wellblock and less wellblock reservoir prediction based on seismic attribute,the waveform indicates the lateral inversion in dense wellblock using seismic waveform changes to reflect the characteristics of the phase change of reservoir space,and then to predict reservoir distribution characteristics.This kind of zoning classification can greatly improve the accuracy of reservoir prediction.Finally,the sedimentary facies zone map of 13 main sedimentary units in the study area and the sandstone thickness prediction of Pu I Formation are completed.Finally,according to the structural characteristics,oil-water plane and vertical distribution characteristics of G oilfield,the study area is divided into 12 blocks,and the dynamic and static data of developed Wells in the edge area are analyzed to determine the expansion potential.Finally,based on the structural characteristics,reservoir distribution,oil and water distribution and productivity of developed Wells,13 favorable areas for spreading Wells are divided into 3 categories,providing suggestions for further tapping potential of oilfield.