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This study aims to identify hydrocarbon by evaluating anisotropy parameters estimated from corsswell seismic data. Several approaches were performed in this study included shear wave splitting (SWS) and angle-based velocity variation (VVA) methods. Anisotropy coefficient K was estimated by SWS method and anisotropy parameters ε, δ, and γ were estimated using modified Thomsen’s equations in Vertically Transverse Isotropy (VTI) medium applied to Crosswell seismic geometry. The velocity variation was observed when pressure (P) wave propagated through a layered media containing hydrocarbon. The P-wave velocity was decreasing along with the increasing of the incidence angle and the calculated values of anisotropy (ε, δ, γ, and K) on the target zone within interval 1390 m to 1820 m depth were relatively high compared to the zone does not contain hydrocarbon. The evaluation was verified with Poisson’s, pressure wave velocity (V P ) and shear wave velocity (V S ) ratio analyses and validated to the existing petrophysics data. In conclusion, anisotropy values (ε, δ, γ and K) and velocity variation with angle of incidence have a positive relationship with hydrocarbon and applicable as a tool for identifying the presence of hydrocarbon in layered media.

Hydrocarbon identification by evaluating anisotropy parameters estimated from crosswell seismic data