This paper will describe the results of development drilling to date in the basement reservoir of the Ruby Field in the Mekong Basin, Offshore Vietnam. The results of joint research on the Ruby discovery wells and onshore basement exposures (Peter M. Tandom et al. 1997) were used to develop an interpretation model for the fractured and weathered granite reservoir. This model has proven very robust, and has now been further enhanced by applying more quantitative formation evaluation techniques to determine fracture aperture and porosity. Various acquisition techniques and computation algorithms have been tested to come up with an optimized logging program; giving consistent results compared with core analysis and production data. It is now possible to predict with some certainty the most prospective hydrocarbon bearing intervals, and work is currently being focused on the estimation of likely production rates. Failure to meet the expected well deliverables provides a criteria for identifying candidates for stimulation. These techniques will also be reviewed. As more wells are drilled, it has become possible to better correlate and map the producing horizons. This clearly allows better planning of the location of future wells, and the thickness of the reservoir section which needs to be penetrated, so optimizing field economics.
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