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Predicting Seal Brittleness of Conventional Hydrocarbon Reservoirs Using LMR - a Case Study from the Norwegian Barents S
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 80th EAGE Conference and Exhibition 2018, Jun 2018, Volume 2018, p.1 - 5
Abstract
Among other causes (e.g. pressure release and gas expulsion, tilting and spillage from pre-uplift hydrocarbon accumulation, cooling of source rock etc.) failure of seals linked to the uplift have been proposed the main reason for the lack of success in finding commercial petroleum accumulation in the Norwegian Barents Sea. This study predicts seal quality of Upper Jurassic Fuglen Formation from well log data of three exploration wells Skrugard (7220/8-1), Drivis (7220/7-3S) and Havis (7220/7-1) in the tectonically complexed, uplifted Norwegian Barents Sea using the LMR (LamdaRho-MuRho) rock physics templet. A simple rock physics model which allowed to compute theoretical values of dynamic elastic parameters for common constituents of shales and sandstones are utalized to constructe the LMR templet. The template shows the variation in LMR for a combination of mineralogical mixtures versus porosity. Results show that overall the Fuglen Formation in all three wells is a good seal though the caprocks/top seals have significant variations of brittleness values where a small upper sandy unit of Havis well shows high brittleness compared to the shale dominated sections. Brittleness indices estimates based on elastic parameters are easy to use but require calibration of lab observation.