An independent method for estimating initial reservoir water saturation in the Gyda Field has been investigated. Further application of recent tracer technology was used in describing the initial fluid saturations in the reservoir. This was achieved by using a deuterium tracer technique to quantify aqueous mud-filtrate invasion to core and which enabled 'native' water saturation determinations to be made. The volume of extracted core-water was translated into native reservoir water saturations after correcting for mud-filtrate invasion, reservoir overburden, pressure and temperature effects.

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