Changes

Follow the steps listed in the table below to map the location of possible hydrodynamic traps.

Follow the steps listed in the table below to map the location of possible hydrodynamic traps.

# Look for [[permeability]] barriers or hydrocarbon-free water levels using pressure-depth plots.

# Calculate potentiometric values for each well using the formula  

#*<math>\text{H}_{\text{w}} = \text{Z} + \left( \frac{\text{P}} {\text{grad P}} \right)</math>

# Make a water isopotential map with respect to oil or gas, using the formula for V,

#*<math>\mbox{V} = \left(\frac{\rho_{\rm w}}{\rho_{\rm w} - \rho_{\rm hc}}\right)\mbox{H}_{\rm w}</math>

#*Note: Use gas density where gas is expected and oil density where oil is expected.

| Look for [[permeability]] barriers or hydrocarbon-free water levels using pressure-depth plots.

# Make a gas or oil isopotential contour map using the formula for U where U = V – Z. The values for Z, the subsea elevation of the target aquifer, can be determined by simply overlaying a structure contour map on the water isopotential map and subtracting (see “Example” below).

# Locate possible accumulations of hydrocarbons in hydrodynamic traps by locating the areas of low gas or oil potential. Locations should make sense in context with all other geologic data.

| Calculate potentiometric values for each well using the formula  

 

:<math>\text{H}_{\text{w}} = \text{Z} + \left( \frac{\text{P}} {\text{grad P}} \right)</math>

| Make a water isopotential map with respect to oil or gas, using the formula for V,

 

:<math>\mbox{V} = \left(\frac{\rho_{\rm w}}{\rho_{\rm w} - \rho_{\rm hc}}\right)\mbox{H}_{\rm w}</math>

 

Note: Use gas density where gas is expected and oil density where oil is expected.

| Make a gas or oil isopotential contour map using the formula for U where U = V – Z. The values for Z, the subsea elevation of the target aquifer, can be determined by simply overlaying a structure contour map on the water isopotential map and subtracting (see “Example” below).

| Locate possible accumulations of hydrocarbons in hydrodynamic traps by locating the areas of low gas or oil potential. Locations should make sense in context with all other geologic data.

===Calculating h_w===

===Calculating h_w===