Análise Petrogeofísica integrada com a Sismoestratigrafia no Oligo-Mioceno, Sul da Bacia de Santos

Abstract

Rock physics can be integrated with seismic stratigraphy to predict reservoir quality, presence of fluids and spatial variability, which are critical properties in exploration of the depositional sequence (SD) E80 - Upper Oligocene and in the depositional sequence (SD) N10 - Lower Miocene in the south of the Basin Santos. Seismic stratigraphic analysis made it possible to differentiate the depositional environments associated with the paleo-physiography of the SD-E80 and SD-N10, recognizing the shelf, the changes in the shelf-break, the slope and the basin. Petrophysics on three key wells, 1-SCS-7, 1-SPS-58 and 3-SPS-92 revealed differences in the quality of the reservoirs in the above-mentioned depositional environments and enabled an integration of rock physics with seismic stratigraphy through the use of rock physics templates (RPT). Synthetic AVO modelling of the seismic line 0258-1303 demonstrated the degree to which the depositional environment, facies and fluids affected the AVO response of SD-E80 and SD-N10. Fluid substitution using the Gassmann equations showed the effect of hydrocarbons in the sandstones in order to obtain a sense of magnitude relative to the depositional effects on seismic amplitudes and AvO.