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Prediction of formation water resistivity from Rwa analysis | 15646
International Research Journals

Prediction of formation water resistivity from Rwa analysis of Titas gas field using wireline log data

Abstract

Mohammad Islam Miah and M. Farhad Howladar

The Titas gas field is the biggest gas field in Bangladesh which lies in the south central part of the Surma Basin. This paper predicts the formation water resistivity from wireline log data by Inverse Archie’s formula (Rwa analysis). The formation water resistivity is the most important rock fluid properties for saturation (water or hydrocarbon) and salinity of NaCl estimation, Petrophysical analysis and Formation evaluation in the Petroleum field. The geothermal gradient ranges from 1.68-2.44 0C per 100 meter following surface temperature at 25 0C. The average formation temperature is 80.92 0C of A2 gas sand based on log data. The average formation water resistivity is 0.139 ohm-meter based on Rwa analysis and salinity of NaCl is 19670 mg/L of A2 gas sand which implies that the formation water resistivity value is slightly lesser than the assumed value by Reservoir Management Project-2 of Petrobangla (2009) and Interkomp Kanata Management (1991). Though, the estimated value is slightly lesser but more reliable for calculating water or hydrocarbon saturation and formation evaluation of Titas gas field.

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