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Results
Summary The change of elastic moduli of dry sandstone with effective pressure is a result of the subsequent closing of a series of pores. This process is approximated with the KT model and the expression of effective pressure dependence of pore aspect ratio spectra. By inverse modelling, the pore aspect ratio spectra of the water-saturated sandstone samples are obtained from velocity measurements. These pore aspect ratio spectra are then used to calculate the elastic moduli of the corresponding dry sandstone samples. An exponential function is found to best fit the rate of change of the dry elastic moduli with effective pressure.
Summary The sensitivity of seismic velocities and acoustic impedance to the changes in reservoir conditions is prominent in the case of small dry elastic moduli. Porosity itself has a negative effect on feasibility, but it strongly affects dry elastic moduli. For normally consolidated clean sandstones, reservoirs can be monitored seismically for water drive as deep as 500m. In geopressured zones, 4-D seismic surveys can target 6500 m deep if seismic data quality is fair. Introduction Recent examples of 4-D seismic surveys (Jack, 1998; Sonneland et al., 1997) have demonstrated potential for inferring reservoir conditions from seismic data.
- Geophysics > Time-Lapse Surveying > Time-Lapse Seismic Surveying (1.00)
- Geophysics > Seismic Surveying (1.00)