Fine Structural Interpretation And Reserv Oir Prediction Of Fuyu Reservoir In Block Fang 22-Fang 36

Taking Fuyu oil layer in Fang22-Fang36 block as the research object,in view of the problems of seismo-geology,such as difficult identification of F1 reservoir group,difficult fine characterization of single sand body,and difficult assurance of fine inte rpretation of small faults in Fuyu reservoir with imaging accuracy and amplitude pres ervation of seismic data,this paper implements favorable oil and gas enrichment areas and "dessert" as the objectives combined with seismic attribute analysis,carries out c omprehensive reservoir prediction integrating earthquake and geology to meet the engi neering requirements of thin sand exploration based on well-seismic combined geologi cal stratification,structural research and reservoir prediction as the core,and pseudo-a coustic geostatistical inversion as the means.The high-resolution sequence stratigraphic framework of Fuyu oil layer in Fang22-Fang36 block is established by well-seismograph analysis.Combining coherent body analysis technology and ant body fault detection technology,fine structural interpretati on of each reservoir group in Fuyu oil layer is carried out.The study of fracture cha racteristics shows that under the action of tensile and torsional stress field,a series of complex faults are developed in the study area,and the faults have obvious segment ation and inheritance,the scale of a single fault is relatively small,and the fault dista nce is generally large in the upper part and small in the lower part.Three third-order cycles are identified,corresponding to three oil layer groups FI,FII and FIII,and ei ght fourth-order cycles.At the interface of eight fourth-order cycles,370 structural tra ps dominated by fault blocks are identified.On the basis of determining the sensitive parameters of reservoir and oil layer,a seismic forward modeling model including 8 kinds of different groups and different l ithologic combinations is comprehensively designed,and the distribution characteristics of small sand bodies and oil layers in Fuyu oil layer are quantitatively predicted by using pseudo-acoustic geostatistical inversion method and inversion parameters.Judgin g from the distribution of sand bodies predicted by each small layer,F11,F17 and F24-F25 sand bodies are not developed as a whole.Controlled by the four-stage base-l evel cycle,the other layers of sand bodies are developed to varying degrees,includin g F14,F15,F16,F21-F23,F31-F34 and other layers of sand bodies,with large sands tone thickness,high structural position and NW-trending faults.Based on the research results of structure,reservoir and known reservoir,the reservoir-forming model of up per generation and lower storage in Fuyu oil layer is summarized.Faults are good ch annels for oil and gas to migrate downward.The third-order structure is characterized by high in the west and low in the east.Near-north and north-east faults cut the thi rd-order structure into four-stage traps formed by multiple fault blocks with different s izes and heights,forming multiple structural high points in the area,while there are f ew structural traps in the low-order parts in the northeast.The short banded and lenti cular channel sand bodies developed in the target layer are conducive to the formatio n of lithologic oil and gas reservoirs.Based on the reservoir forming factors such as sand body thickness,faults,structural height and oil-water interface,the favorable zoni ng can be divided into 3 types,4 type I areas with an area of 68.11km2,mainly dist ributed in the southwest of the work area,and 6 type II areas with an area of 51.42km2,distributed in the northwest of the work area.