Formation Evaluation


Important Notice:

The following webpages are NOT meant to be a substitute for scholarly text books on formation evaluation. These webpages are meant to help refresh your recollection of selected topics that you previously studied.

This is a work in progress! I appreciate all emails, that will help me improve these quick summary sheets.

Please send emails to

Thank you,

Dave Lord


Petrophysical Analysis

What is Petrophysics?

Coring Practices

Acoustic Log Analysis (Basic)

Density Log

Neutron Log

Well Testing

(work in progress)

- Outside PTA Links:

Feteke Short Video Presentations

Fekete has 6 well testing videos: Deconvolution I and 2, Testing Tight Gas Sands, Evaluation Gas-in-Place, Well Dynamics in Well Testing.

I particularly like the deconvolution one. This is a very complex area and Louis Mattar did a great job of "making it as simple as possible, but not more so." (Einstein)

Henri-Georges Doll

Other links (see note below on errors)

- Logging

Nuclear Magnetic Resonance Log (Article by Schlumberger)

Petrophysics (Wikipedia)

Density Logs (Wikipedia)

SP Logs (Wikipedia)

Neutron Log (Schlumberger)

LAS format

- Wireline Testing

RDT (Reservoir Description Tool, Halliburton) RDT Fact Sheet (pdf)

MDT (Modular Formation Dynamics Tester, Schlumberger)

RCI (Reservoir Characterization Tool, Baker Hughes)

- Formation Characterization

Fundementals of Wettability (Oilfield Review, Schlumberger)

- Fluids Characterization

Advancing Fluid-Properties Measurements (Oilfield Review, Schlumberger)

Proper Well Conditioning for Taking a Bottomhole Sample (Corelabs)

Advanced Fluid Studies (Corelabs)

- Special Core Analysis (SCAL)

- Others

Video Presentation of NMR and other topics (Corelabs)

Compaction and Subsidence (Oilfield Review, Schlumberger)

If a link is not working, please email me at: