Overpressure mechanism detection

As you know, there is some methods to find overpressure generation mechanism like using velocity, density, porosity and velocity-effective stress cross plots.

Here is the link result for one of my research on carbonate formation, (I know the complexity of PPP in carbonate). I have used velocity-density cross plot and separate the depth intervals by 100 meters: http://i59.tinypic.com/w7243t.png

The top of overpressure is at 2800 meters. As you see in the picture, the velocity-density cross plot below this depth (2800 m) deviates from the NCT to back at above the normal trend.
Which mechanism do you think cause this deviation? Disequilibrium compaction, unloading, chemical diagenesis, or other?

Minimum horizontal stress from logs in an anisotropic environment

What is the experience in estimating the minimum horizontal stress magnitude from logs in an environment exhibiting HTI anisotropy? I have a dipole sonic log which shows anisotropy in some of sands and based on the slowness/frequency behavior we suspect  the measured anisotropy stems from stress imbalances around the wellbore and not from fracturing. 

"Rock mechanics" vs. "geomechanics"

What are your definitions of "rock mechanics" and "geomechanics" and the difference if you believe they are different. Your participation in this discussion is greatly appreciated and will help reaching a consensus within our community.

Effect of fault types on stress regime

Can someone explain how different fault types (dip-slip, strike-slip, etc) tend to affect the stress regime (orientation and magnitude) across them? Is there a specific way how these faults affect the stress regime, individually, or there is no definitive correlation between the fault type and stress variation?

SPE/AAPG/SEG Pore Pressure Workshop Attendees

I know that some of the group are here in San Antonio at the SPE/SEG/AAPG Pore Pressure Workshop. Please feel free to share any thoughts, comments or key learnings that you have of the workshop. Maybe it was a talk you liked, or a common theme or discussion topic you found interesting, or even ideas for future workshops.

Also, please feel free to catch up and say hi! Would be great to meet you.

Breaking NCLT

It has been said that if you "break" Eaton's NCT line (forming a total of two lines), the lines must be parallel to each other. Is there an exception to this rule? If so, what is it based upon?

If there are any references or articles on this, please do not hesitate to mention them.