Home / Vol. 22 No. 1 (2016)

Log Derived Saturation Functions for Giant Carbonate Reservoirs in the Middle East

Tawfic A. Obeida

United Arab Emirates

DOI: 10.68482/prj.2016.22.010 · Published Dec 2016 · Section: Petroleum Engineering · Pages: 125–128

Abstract

Fluid saturation distribution at initial reservoir conditions is vital for calculation of original oil in place (STOOIP) and reservoir simulation (dynamic models). It is a critical step in model initialization, since the subsequent step (quality of history matching) is largely dependent on the initial fluid distribution at time zero. In many reservoirs there are limited or no SCAL (drainage capillary pressure) data available and in many cases, the available limited SCAL data has poor quality and subjective plug selection. However, log-data (open hole logs, OHL) and routine core analysis (porosity and permeability measurements) are usually more available. The proposed method combines OHL and routine core analysis (RCA) to derive saturation functions for carbonate reservoirs with complex pore structure. The proposed method uses a multi-regression technique to relate water saturation to height above FWL and rock quality index (RQI) for each reservoir rock type (RRT).This method already been tested in carbonate reservoirs such as Shuaiba reservoir and Thamama-group formations. This study used 58 core wells penetrating Thamama reservoir with permeability measurements covering six petrophysical groups. The comparison results show a good match between the calculated initial water saturation (Swi) from the dynamic model. The STOOIP calculations indicated good agreement (within 3% difference) between the dynamic and static models.

Keywords

Fluid Saturation, Reservoir Simulation, SCAL, Dynamic Model, Static Model

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