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Line 27: − {| class = "wikitable"+ − |-+ − ! Step+ − ! Action+ − |- − | 1 − | Using graph paper with a linear grid, label the X-axis as pressure and the Y-axis as depth. Use as large a scale as possible. Also, make the Y-axis on at least one plot the same scale as on the well logs to aid in interpretation. − |- − | 2 − | Plot measured pressure from the [[aquifer]]s (100% water saturation [S<sub>w</sub>] ) in the well. If none is available, go to step 3. − |- − | 3 − | Plot measured pressure from the aquifers in nearby wells. If none is available, go to step 4. − |- − | 4 − | Calculate and plot hydrostatic pressures for a depth above and a depth below the zone of interest. Use the rule-of-thumb pressure gradient for that zone. If it is not available, calculate the gradient from the water density using [[Formation water density|density measured from the formation water]] or calculated from the [[Spontaneous potential logs in water resistivity calculation|water resistivity (R<sub>w</sub>)]] . For help, see the following sections. − |}
Hydrostatic pressure-depth plot construction (view source)
Revision as of 14:25, 15 December 2014
, 14:25, 15 December 2014→Procedure: constructing a plot
The table below outlines a procedure for constructing a hydrostatic pressure-depth plot for a single well.
The table below outlines a procedure for constructing a hydrostatic pressure-depth plot for a single well.
# Using graph paper with a linear grid, label the X-axis as pressure and the Y-axis as depth. Use as large a scale as possible. Also, make the Y-axis on at least one plot the same scale as on the well logs to aid in interpretation.
# Plot measured pressure from the [[aquifer]]s (100% water saturation [S<sub>w</sub>] ) in the well. If none is available, go to step 3.
# Plot measured pressure from the aquifers in nearby wells. If none is available, go to step 4.
# Calculate and plot hydrostatic pressures for a depth above and a depth below the zone of interest. Use the rule-of-thumb pressure gradient for that zone. If it is not available, calculate the gradient from the water density using [[Formation water density|density measured from the formation water]] or calculated from the [[Spontaneous potential logs in water resistivity calculation|water resistivity (R<sub>w</sub>)]] . For help, see the following sections.
==Calculating pressure gradients from water density==
==Calculating pressure gradients from water density==