S油田目的层水淹前后地震剖面及差异剖面特征规律OA

To promote the efficient development of S Oilfield,this study is based on rock theory research achievements,including the calculation of dry rock modulus using three—parameter methods and Gassmann's theoretical equations.For the three types of reservoirs with representative thicknesses,namely thin reservoirs,medium-thickness reservoirs and thick reservoirs,a study on the understanding of water flooding laws is carried out based on forward simulation.The research results show that in terms of seismic profile comparison,for thin and medium-thickness reservoirs under trough-type,slope-type and peak-type water flooding,the reflection amplitude at the flooded location is weaker than that before flooding,and the laws of each type are different.When the thick reservoir is under trough-type water flooding,the amplitude decreases,while in the case of slope-type and peak-type water flooding,the amplitude increases or decreases,and the laws are different.In terms of the difference profile,when trough-type water flooding occurs,the amplitude difference in the middle of the flooded part of reservoirs with different thicknesses is large,and the two ends are relatively small.For slope-type water flooding,from the upper part of the slope to the bottom of the structure,the amplitude difference first changes from weak to strong and then slightly weakens.For peak-type water flooding,from the top to the trough,the amplitude difference changes from weak to strong and then weakens.After inspection,the analysis of the actual profile is consistent with the results of the forward simulation,indicating that this research result has a positive guiding role in the water flooding interpretation of S Oilfield.