Because the borehole gravity meter is the only tool that can measure bulk density away from the borehole, it is ideal to use for finding bypassed pay zones. In [[:file:applying-gravity-in-petroleum-exploration_fig15-15.png|Figure 4]], Case #1 shows a model of laterally homogenous geology and no density anomalies. Case #2 shows a region of lower density, possibly signifying the presence of missed hydrocarbons [[length::60 m]] from the well. The density difference detects the distant density contrast as a broad, anomalous low with its minimum centered at the correct depth. Such a zone may be within range of a borehole sidetrack. In Case #3 the low-density missed pay zone is within [[length::15 m]] of the well, and a strong density difference exists. Such pay zones may be in the range of a possible [[well completion]] after hydrofracturing the reservoir. In Case #4 the missed pay is about [[length::1 m]] from the well, and the density difference is very pronounced. Such pay zones are within the range of normal [[well completions]] but would still be undetected by any other logging method. | Because the borehole gravity meter is the only tool that can measure bulk density away from the borehole, it is ideal to use for finding bypassed pay zones. In [[:file:applying-gravity-in-petroleum-exploration_fig15-15.png|Figure 4]], Case #1 shows a model of laterally homogenous geology and no density anomalies. Case #2 shows a region of lower density, possibly signifying the presence of missed hydrocarbons [[length::60 m]] from the well. The density difference detects the distant density contrast as a broad, anomalous low with its minimum centered at the correct depth. Such a zone may be within range of a borehole sidetrack. In Case #3 the low-density missed pay zone is within [[length::15 m]] of the well, and a strong density difference exists. Such pay zones may be in the range of a possible [[well completion]] after hydrofracturing the reservoir. In Case #4 the missed pay is about [[length::1 m]] from the well, and the density difference is very pronounced. Such pay zones are within the range of normal [[well completions]] but would still be undetected by any other logging method. |