TDT monitors gas saturation in heterogeneous reservoir
- King Saud Univ., Riyadh (Saudi Arabia)
Thermal decay time (TDT) logs were used for determining the gas/oil contact in wells in the Zeit Bay field in Egypt. Gas/oil contact in the field was revised using the results from the model that was developed. The analysis followed the Polyachenko model of functional relationship between count rates and gas saturation. Several crossplots were made for the same range of porosity and connate water saturation. These crossplots included: formation capture cross section; total selected near detector counts; total selected far detector counts; capture cross section of the borehole; and inelastic far detector counts. Each crossplot gave a definite diagnostic shape around the depth of the gas/oil contact. By using these crossplots, it is possible to calculate gas saturation from a stand-alone run. The model was validated by RFT (reservoir formation tester) and open hole log data from infill wells. Also, the analysis was successfully applied in wells without an ambiguous gas/oil contact.
- OSTI ID:
- 605803
- Journal Information:
- Oil and Gas Journal, Vol. 96, Issue 21; Other Information: PBD: 25 May 1998
- Country of Publication:
- United States
- Language:
- English
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