Changes

==Travel time from sonic logs==

==Travel time from sonic logs==

[[file:formation-fluid-pressure-and-its-application_fig5-21.png|thumb|300px|{{figure number|2}}Sonic travel time varies with measured pressure. Copyright: Powley, 1990{{citation needed}}; courtesy Earth Science Reviews.]]

[[file:formation-fluid-pressure-and-its-application_fig5-21.png|thumb|300px|{{figure number|2}}Sonic travel time varies with measured pressure. From Powley;<ref name=ch05r14>Powley, D., E., 1990, Pressures and hydrogeology in petroleum basins: Earth Science Reviews, vol. 29, p. 215–226.</ref> courtesy Earth Science Reviews.]]

In some places, an empirical relation can be established to predict pore pressure from well logs. [[:file:formation-fluid-pressure-and-its-application_fig5-21.png|Figure 2]] shows sonic travel time varying with measured pressure.

In some places, an empirical relation can be established to predict pore pressure from well logs. [[:file:formation-fluid-pressure-and-its-application_fig5-21.png|Figure 2]] shows sonic travel time varying with measured pressure.

* [[Pressure prediction: analysis of mud weights]]

* [[Pressure prediction: analysis of mud weights]]

* [[Pressure prediction: analysis of cuttings]]

* [[Pressure prediction: analysis of cuttings]]

==External links==

==External links==