Abstract
The Faja Petrolífera del Orinoco (FPO) in Venezuela is the most extensive accumulation of heavy oil in the world. Consequently, the main objective is to use 3D-3C multicomponent seismic data for sandstone discrimination in the Petrocedeño block in the FPO, with the aim of providing information that contributes to better characterization of heavy-oil deposits. Log- and seismic-frequency-scale rock-physics analysis for lithology discrimination was performed, revealing that sandstones and shales might be discriminated using acoustic-impedance (AI) and VP/VS attributes. Shales have lower acoustic impedances and higher VP/VS than sandstones. Therefore, a cutoff of 2.45 in VP/VS ratio was set to separate sandstones and shales. A model-based acoustic seismic inversion was performed, and VP/VS ratio volume was estimated, interpreting horizons in PP and PS volumes, then shrinking PS to PP reflection time. Consequently, lithology distribution could be mapped using those volumes. Geologically speaking, the lower interval with more sandstone corresponds to a fluvial environment, whereas the upper interval is deltaic with more proportion of shale, according to regional geology as well.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.