Changes

{| class = "wikitable"

{| class = "wikitable"

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! Step

! Step || Action

! Action

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| 1

| 1 || Find the purest shale intervals on the GR or SP base line. They must be reasonably thick to allow valid responses of the other logs and free of sand or lime stringers. (See points a–e, [[:file:formation-fluid-pressure-and-its-application_fig5-20.png|Figure 1]].)

| Find the purest shale intervals on the GR or SP base line. They must be reasonably thick to allow valid responses of the other logs and free of sand or lime stringers. (See points a–e, [[:file:formation-fluid-pressure-and-its-application_fig5-20.png|Figure 1]].)

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| 2

| 2 || At the same depth, mark the value of resistivity, conductivity, sonic travel time, or density.

| At the same depth, mark the value of resistivity, conductivity, sonic travel time, or density.

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| 3

| 3 || Note any series of these best shale values vs. depth. These define a normal shale trend (NST) line for each of the log curves to be used.  

| Note any series of these best shale values vs. depth. These define a normal shale trend (NST) line for each of the log curves to be used.  

''' Note: ''' Departure from the NST line indicates abnormal microporosity due to abnormal pore pressure.

''' Note: ''' Departure from the NST line indicates abnormal microporosity due to abnormal pore pressure.

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