− | | 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. <break> </break> ''' Note: ''' Departure from the NST line indicates abnormal microporosity due to abnormal pore pressure. | + | | 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. |