Use of the borehole gravity (BHG) meter as a detector of density distribution suggests that a reservoir could be monitored for bulk density changes caused by redistribution of fluids after hydrocarbons have been partially extracted from it. In a simple situation in which liquid hydrocarbons are being extracted from a well, an overlying gas zone might begin to penetrate toward the perforations from above, while an underlying water-zone formation might begin to penetrate toward the perforations from below. One idealized reservoir and one real reservoir are modeled for BHG meter responses in prepump and postpump reservoir conditions. Results suggest that the BHG meter density differences could be detected if the survey had a high degree of quality control.

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