Resumo

MARTINEZ, José; ALMANZA, Ovidio  e  MONTES, Luis. PERFIL SÍSMICO VERTICAL EN UN POZO DESVIADO PARA ILUMINAR UN RESERVORIO CON ESTRUCTURAS DE BAJO BUZAMIENTO USANDO ONDAS CONVERTIDAS. Rev. acad. colomb. cienc. exact. fis. nat. [online]. 2011, vol.35, n.134, pp.71-77. ISSN 0370-3908.

After cementing and casing a deviated well, the acquisition of a Vertical Seismic Profile (VSP) was considered in order to map a reservoir imaging the zone below and around the hole using shear waves (PS). Environmental restrictions on the area limited the possible survey geometries. The main objective of this paper is to define and apply the methodology to select the appropriate VSP survey in a deviated well, and also establish the parameters and VSP data processing sequence to provide an image on which to map and delimit laterally the top and base of the hydrocarbon reservoir. Using sonic and density logs, a synthetic seismogram was build and tied to a migrated seismic section along the well path. With ray tracing modeling, different geometrical surveys were simulated in a 2D geologic model build through sonic and density logs, providing several imaging scopes from which the optimal configuration was chosen. By simulating the optimal VSP survey in the 2D geologic model a synthetic VSP data set was supplied and processed. A VSP survey with the optimal configuration was run providing a data set that after processed with the same sequence applied to synthetic VSP data confirming the subsoil model and imaging the target zone.

Palavras-chave : vertical seismic profile; VSP; waves; ray tracing; seismogram.

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