MIXED RESERVOIR WETTING IN UNCONVENTIONAL RESERVOIRS AND INTERPRETATION OF POROSITY/RESISTIVITY CROSS PLOTS, DERIVED FROM TRIPLE-COMBO LOG DATA

摘要

Measurements of fluid wetting characteristic are made routinely on rock samples. However, there are no published petrophysical models to differentiate between oil-wet and water-wet fractions of a reservoir sequence using commonly available log suites.This presentation builds on our previous publication that describes the unconventional reservoir petrophysical model we have developed (Holmes 2014). Essentially, we define four porosity components, namely total organic carbon, clay porosity, effective porosity (inorganic), and effective porosity (organic). This last component, which is associated with total organic carbon, is an indirect calculation if the first three components do not sum to total porosity.