| Reservoir prediction technology is a technology that comprehensively uses seismic,geological,logging and other data to reveal the geometric shape(including reservoir thickness,reservoir top and bottom structure,extension direction and pinch-out position)of underground target layer(reservoir,oil and gas layer,etc.)and the distribution characteristics of reservoir microscopic reservoir performance parameters at different stages of exploration and development.Accurately predicting the spatial variation of reservoir parameters is of practical and far-reaching significance in oil and gas exploration and development.In this paper,the three-dimensional area of Su 203 in the Sanbian area of Ordos Basin is taken as the research object.Based on a large number of literature research,the seismic geological data and logging data of the study area are collected,and the seismic geological conditions,sedimentary characteristics,stratigraphic division and horizon interpretation of the study area are carried out.Finely characterize the fault structure and complete the reservoir prediction research.The Su 203 3D research area is located at the edge of the Mesozoic hydrocarbon generating lake basin in the three sides of the Ordos Basin,presenting a "convex" shape that tilts westward as a whole.The early seismic data of ancient landforms,faults,structures,and reservoirs in this area are relatively rough,and the success rate of drilling is relatively low(26%).Based on comprehensive analysis,it is believed that there are many oil bearing strata in this area,with the main research layers being Yan9 and Chang7.The sedimentation and oil bearing properties of the reservoirs are relatively complex,and the rules and patterns of oil and gas accumulation are not clear.Therefore,specific geological methods are needed to accurately predict the reservoirs in this area.Combined with the seismic,geological,drilling,logging,mud logging and oil test data of Su 203 three-dimensional area,a systematic and comprehensive analysis is carried out.The results show that the signal-to-noise ratio of the seismic data after reprocessing is higher,and the frequency band of the Mesozoic target layer is broadened.The fault characteristics of the target layer are clearer,the imaging effect is better,the amplitude of the reflected wave is strong,the continuity is good,and the inside is clear,which meets the research needs.The overall structure of the study area is relatively simple,and the main stratum is uplifted from east to west.The overall performance is high in the east and low in the west,and multiple favorable traps such as fault anticline,anticline and fault nose uplift are developed.After the fine calibration of the seismic synthetic record of the well location in the study area,the logging constrained horizon is corrected to reduce the error.The seismic attribute technique is used to extract the fault fusion attribute plane of Yan 9and Chang 7 sections in the study area.The Mesozoic in the study area mainly develops three stages of faults in Indosinian,Yanshanian and Himalayan.Among them,the Yanshan fault controls the accumulation of reservoirs,and the Himalayan fault destroys the Jurassic Jurassic reservoir.The parameters sensitive to reservoir in seismic attributes are extracted and compared with the structural characteristics of the study area to achieve preliminary prediction.The seismic inversion of the seismic horizon after well correction is carried out to obtain the distribution of sand bodies in the profile,and the results of clear distribution of thin reservoirs are optimized.The reservoir prediction of each layer in the study area is completed by comprehensive analysis of various methods.This study aims to finely describe the reservoir characteristics of each layer,optimize favorable exploration blocks,and improve the success rate of drilling. |
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