Building a Core-calibrated Wireline-based Permeability Prediction Model for Ubon Field, Thailand, with Model Testing in Uncored Well Sections and Validation by TST or DST

Abstract

In this study, the goal is to create a permeability prediction model for the UB01 and UB02 wells in UBON field. Based on a re-evaluation of existing core characteristics and the multivariate validation of wireline values using core-measured rock properties in these wells, the following input parameters were tested; depositional environment, provenance, compaction and diagenesis. Depositional environment was found not to be significant as an input parameter to the permeability model based on data from the two wells; the rest of parameters were, except that provenance, although statistically classified as significant, exerts a minor influence compared to the others. A permeability prediction model was generated by multiple-linear regression based on the statistically-significant relationships that have integrated core-plug permeability measurements and wireline log responses. However, only UB02 well parameters were used to create the prediction model, as this well showed suitably high regression coefficient values when relating wireline values to compaction (represented by depth in TVDSS) and diagenesis (represented by clay content). A UB01 well permeability prediction model was not built as any integration of all tested parameters showed poor correlation coefficient values. Well test validation was used to independently test and confirm that a core-plug based permeability prediction model can be representative of whole-sand-body flow capacities in potential reservoir intervals, both within and outside of the zone where it was constructed.