Geological Velocity Approach in Order to Obtain a Detailed Velocity Model for the Evaporitic Section – Santos Basin

Reviewing the Evaporites Interpretation using Well-Log Information in Santos Basin_ Benefits and Applications

“…The recent results obtained are showing great value for the Santos Basin Pre-Salt projects (Maul et al, 2015, Meneguim et al, 2015, Oliveira et al, 2015, Falcão, 2017, Fonseca et al, 2018. These studies cite the importance of an in-depth knowledge of the information obtained through well data, such as statistics of values obtained in well logs and lithological interpretation, as presented by Amaral et al, 2015 andYamamoto et al, 2016).…”

Results of Incorporating the Stratigraphy Within the Evaporitic Sequence Into the Velocity Field for Reservoir Characterization

“…The method takes into account seismic response (interface reflectors) derived from the presence of lithologic stratification within the evaporitic section, characterized by the presence/alternance of Halite, Anhydrite, Tachydrite, Carnallite, Sylvite and other evaporites (Oliveira et al, 2015;Amaral et al, 2015;Meneguim et al, 2015Meneguim et al, , 2016Gobatto et al, 2016), as well as possible presence of igneous rocks as described in Oliveira et al (2015).…”

“…Anhydrite and Gypsite correspond to "High Velocity Salts". In addition, some igneous rocks within the salt section were described as having also "High Velocity" behavior (Oliveira et al, 2015;Amaral et al, 2015).…”

“…The proposed method can be adapted according to any available seismic attribute: amplitude, pseudo-impedance, relative acoustic impedance, absolute impedance, seismic facies. The results will provide velocity models that use any seismic attribute as a weight factor for modeling the evaporitic section, achieving a better representation of the lithologic heterogeneities (Maul et al, 2015;Jardim et al, 2015;Oliveira et al, 2015;Meneguim et al, 2015Meneguim et al, , 2016González et al, 2016;Gobatto et al, 2016;Yamamoto et al, 2016). Maul et al, 2016;González et al, 2016;Gobatto et al, 2016;Yamamoto et al, 2016).…”

“…Figure 4 -Application methodology results: (A) Velocity model: almost constant values for evaporitic section; (B) Seismic amplitude cube; (C) Combination between (A) and (B) (adapted fromMaul & Falcão, 2014in Oliveira et al, 2015.…”