I recommend the book Basic Well Log Analysis by George Asquith and Daniel Krygowski, AAPG Methods in Exploration No 16. It steps through all the log-based methods to determine net pay in both oil and gas wells using all the common logs.

Dear Benjamin,

Many thanks for your recommendation. Do you have any file to forward to me at my email: [email protected]

Regards

Mr. Burke provides an excellent resource for someone who is interested in learning traditional methods or techniques. However, if a person needs to do a study for a particular reservoir or field, log analysis using paper logs and charts is very time consuming. GS Software, Inc. provides a computer program that follows traditional log analysis logic, so that if you learn the methods in Asquith & Krygowski's book you can easily follow the software's work flow and anticipate realistic results. The software is one of the programs recommended by the SPWLA, and is much less "Black Box" than the software of other big name companies. For those outside of major companies with IT departments, it incorporates GIS mapping so that it integrates well with ArcView.

The software can be viewed at www.geoscience-software.com. I should add that I have no connection to the software company, except for being a well satisfied user for 12 years.

Thank you very much for enlightening comments.

Hope further collaboration.

Luck

I am about completing a Research on the use of multiple regression analysis to derive the best relationship of the form f = k(porosity, volume of shale, initial water saturation) which was then used to estimate optimum petrophysical cutoffs for the reservoir under study. Your paper made interesting reading, although I would say that it is always best to use specific petrophysical data in the determination of cutoffs for specific reservoirs using the conventional cutoff-based approach.