Research On Fine Structural Interpretation And Reservoir Prediction Of Four To Seven Fault Blocks In Pubei Oilfield

The four to seven fault blocks in Pubei Oilfield are located in the northwest of the Putaohua structure.The faults in the study area are developed and the structure is relatively complex;the reservoirs are narrow and thin,and the sand bodies vary greatly on the plane.It is difficult to use the existing drilling and logging data of a single well point to achieve a fine study of the sand body between wells,and to meet the needs of the current exploration and development in the middle and late stages.Accurate understanding of reservoir purpose.Based on the principles of high-resolution sequence stratigraphy and structural geology,the stratigraphic division of the Pu Ⅰ oil group is carried out,and the layers and faults of the PI oil group are finely interpreted by combining coherent data volume browsing,seismic attribute characteristics,and 3D visualization technologies.Through curve processing,curve sensitivity analysis,and inversion effectiveness analysis,inversion parameters are determined,and deep lateral resistivity curve fitting is selected for geostatistical inversion to predict the spatial distribution of sand bodies.Seismic attribute optimization is carried out,two attributes of amplitude and sweet spot are optimized,and the idea of "attribute shaping,inversion and delimitation" is used to predict sedimentary facies jointly with wells and earthquakes.The top and bottom structures of the Pu Ⅰ Oil Formation are developed in succession.The structure is high in the north and low in the south,high in the west and low in the east.From north to south,the structural form of“two depressions and one uplift”is formed.Oil source faults are developed,and the faults strike NS,NNW,and NWW are dominant,and the fault combination affects the development of structural traps.The number of traps is large and the scale is large.The trap types are structural-lithological traps.The central and northern anticlines and faulted anticlines are located in the structural high point,has very good storage conditions.The distribution of sandstone is generally affected by the thickness of the stratum,which is thick in the north and thin in the south,thick in the west and thin in the east,and the distribution of sand bodies is lump-shaped and sweet-spot-shaped.Sheet sand is developed in a large area,and channel facies are mostly developed in the central and northeastern parts of the study area.The type of reservoir is structural-lithologic.Structural traps and fault-intensive zones control the distribution of oil and gas in oil-rich areas.Structural faults control the development of favorable oil reservoirs,and structural-lithologic sand bodies are favorable for local accumulation of oil and gas.Combining the analysis of structural research,reservoir characteristics,and favorable accumulation locations,it is of certain guiding significance to carry out the prediction of favorable areas with potential for exploration and development...