A workflow for reservoir characterization applied to presalt coquinas from the Linguado Field, Campos Basin, Brazil

摘要

Characterization of presalt coquinas reservoirs is a know challenging task due to its facies and, consequently, petrophysical properties heterogeneity and anisotropy. This fact makes the traditional seismic interpretation and well log analysis workflow not enough for the interpreter to address reasonably the reservoir complexity. In this study, a methodology integrating different geological and geophysical interpretation techniques based on data pre-conditioning, model-based seismic acoustic inversion, effective porosity geostatistical modeling using sequential gaussian simulation with collocated co-kriging and geobody interpretation is proposed to obtain maximum information from the available data which consists on post-stack seismic and well logs from the lacustrine coquinas carbonate reservoirs from the Coqueiros Formation located in the Linguado Field on Campos Basin. Acoustic seismic inversion results allowed the interpretation of four new seismic horizons that could individualize two coquinas intervals and effective porosity modeling results allowed the geobody extraction of the coquinas banks that represent the best reservoir facies within the study area with effective porosities between 13 and 30% making it even possible to identify new exploratory areas. Therefore, the proposed workflow is very reliable for coquinas reservoirs characterization and can be applied in other areas.