Green Field Development
Accurate subsurface detail is crucial for greenfield oil and gas development; it helps minimize project risks by optimizing well placement/drilling schedules which reduces cost and maximizes profitability. It accurately predicts reserves and resource type leading to the design of efficient infrastructure upfront. Vertical and lateral details can be expressed in form of high-resolution maps unique for each reservoir/pay zone as shown here accompanied by cross sections which show vertical connectivity across these different reservoir units and the aquifer extent.
Brown Field Development
In Brown fields it is useful to screen remaining sweet spots. For example, seismic constrained porosity observations can be compared to DST performance (flow vs no flow) away from wells. Alternatively dynamic data (kvkh from PTA) can be compared with seismic derived net pay thickness map (calibrated to well results). Our extensive capability allows us to quickly integrate information across all types of Brown fields with 10's to 100's of wells. We identify high ranking infill candidates whilst eliminating areas that have been swept in very mature or declining fields. We also provide expertise for anti-collision risk drilling in highly mature fields.
By leveraging Bayesian facies technique, we can estimate discrete net pay accompanied by its probability of occurrence within a detailed stratigraphic framework. Subsequently we can denote areas of laterally continuity and high-grade sweet spots to focus the placement of future development wells.
Upon completing the QC of the derived maps against measured dolomite thickness from wells and dynamic kvkh data from PTA, well planning can be refined. The example shown here co-renders dolomite facies with corresponding probabilities (p>0.5) computed within the relevant stratigraphic framework.
The well path is then reviewed along section and in map view, to ensure landing within target bodies. All potential target along the well bore is subsequently ranked for value/volume.
High Resolution Models for Invisible Thin Pay
Unlike conventional inversion which cannot resolve thin/tight carbonate pay onshore, elastic wave equation-based inversion is able to resolve interpreted thin (10m) dolomitized pay layers in an onshore field. Compressibility volumes show areas of potential dolomitic pay outside the trajectory of the planned development wells, providing scope for well path optimization.