The operator wanted to improve reservoir recovery and geosteer the well within 3–4 ft below anhydrite while unveiling the reservoir architecture and formation characterization.
PeriScope Edge service integrates field geological knowledge by providing wellbore-centric LWD data and ultrahigh-definition bed boundary mapping that extends electromagnetic measurements and enables better fine-tuning of the structure and formation resistivity interpretation around the wellbore, independent of mud type. A new resistivity inversion capability computes geometrically corrected vertical and horizontal resistivity (Rh and Rv, respectively) from bed boundary locations and formation relative dip. In addition, formation-relative dips and boundary positions from the inversion closely match relative dips from other sources such as an image analysis.
The operator used PeriScope Edge service to enable optimal reservoir exposure in a good-porosity zone. The technology mapped another two thin reservoirs within 20 ft of the depth of investigation. The qualitative formation resistivity of Rh and Rv were used for formation evaluation, adding robust information in the high-angle and horizontal wells because of complicated tool responses when crossing boundaries. Deep directional EM tools were beneficial for inversions to derive formation properties by providing measurements and information about the formation resistivity without the need to cross layer boundaries. Data validation compared the Rh and Rv values with the vertical well resistivity. The service enabled solving formation parameters and reviewing model scenarios to find the best match for the 2-MHz 28- and 16-in coaxial propagation responses using a two-layer model. Initial run results demonstrated improved efficiency in reservoir characterization and interpretation.
