During the 2019/20 phase 4B in-fill drilling campaign on the Bualuang Field in the western part of the GoT, Medco Energi drilled 11 oil production wells. The wells consisted of single zone, geo-steered horizontals and deviated multi-zone producers. Geo-steering of the horizontal wells was primarily performed using LWD azimuthal resistivity where the resistivity contrast characteristics of the formation are used for optimally positioning the well.
The reservoirs in the Bualuang field are poorly–to-moderately consolidated, moderately clean with very fresh formation water salinity. In some instances, low-contrast resistivity intervals occur in which water bearing sands, oil pay and even shales exhibit very similar resistivity characteristics. This became particularly challenging when targeting thin (2-5mTVT), oil bearing sandstones in a fluvial/deltaic system.
A case study will be presented illustrating the workflow used to assess the potential causes of unexpected resistivity profiles in the Bualuang field using both conventional petropysical models and more advanced, resistivity inversion modelling and the implications for field volumetric evaluation and completion optimization will be discussed.
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