Formation pressure with logging parameters

Abnormal Formation Pressure Detaction with Mud Logging Parameters. The... 

As long as both parameters are low, the reaction product is WO2. An increase in both parameters yields in the formation of the higher oxides WO2.72, WO2.9 and WO3. Loss by evaporation shows a linear increase with between 1050 and 1275 °C. Changes of volatility occur at the equilibrium pressures of the instability points of the oxides formed. For example, the point of coexistence of W/W3O/WO2 corresponds to 1150K and a log Ph o/Ph, ratio of 0.13. 

---