The Petrophysical Modeling Of Turbidite Reservoirs And Its Research On The Application Of Time-lapse Seismic

Most of the current oilfield development is in the middle and late stages,which puts forward more refined requirements for the remaining oil forecast.Time-lapse seismic technology can dynamically describe changes in the seismic response of a reservoir development process.In order to develop this change into the remaining oil prediction section,in addition to time-lapse seismic inversion techniques,rock physics is also needed to match reservoir parameters with seismic parameters.The actual work area studied in this paper is mainly about turbidite reservoirs.At present,the rock physics model for turbidites still has a lot of deficiencies.Therefore,this paper combines the actual work area conditions and conducts the following research:Firstly,aiming at the fact that the actual oilfield turbidite reservoirs have poor consolidation,large changes in shale content,changes in particle size,etc.,combined with changes in pressure,temperature and oil and gas properties before and after the development of the reservoir,in the past for weakly consolidated sandstones based on the theoretical model of rock physics,corrections were taken to account for the loosening of particles and the irregularities of the interparticle contact surfaces.The study shows that the prediction results of P-and S-wave velocities in the rock physics model established by this method are basically in agreement with the actual log curves.In addition,based on the results of rock physics modeling,the effects of oil reservoir and gas reservoir on pressure and water saturation changes before and after reservoir development,were quantitatively analyzed;AVO forward modeling of oil and gas layers was performed based on Zoeppritz equations.At the same time,the time-lapse seismic forward modeling before and after fluid and pressure replacement was performed using the reflectance method.The analysis shows that the P-wave impedance has higher fluid sensitivity and the S-wave impedance and S-wave velocity have higher pressure sensitivity.The actual reservoir has a good basis for time-lapse seismic analysis.These analysis results also provide basis for time-lapse seismic quantitative interpretation.Finally,time-lapse seismic inversion of the actual time-lapse seismic difference profile is performed,and the inversion results are analyzed based on semi-quantitative and quantitative analysis.From the result of differential inversion,the region of P-impedance change in oil and gas layers is consistent with the quantitative and semi-quantitative analysis results.