Crain's Petrophysical Handbook is under constant development. The major updates are listed here. Many small fixes are not listed as they are too trivial to mention.

If you see errors or omissions, email me and I'll fix it.

Technical contributions and guest lectures are accepted but will be formatted to match the current page style. Some editing may be applied for clarity or brevity.



Jan 2018
   RW From Salinity                 New Spreadsheet

Dec 2017
   Webinar Dates for Jan - Mar 2018  Updated

Aug 2017
   Webinar Dates for Sep - Dec 2017  Updated
Mobile-ready App Instructions        New Page

Jul 2017
   Manual Dip Calculation                Updated
Dip Subtraction, Apparent Dip      Updated

Jun 2017
   Total Organic Carbon                   Updated

May 2017
   Mobile-friendly page layout for iPhone 6, iPad, and equivalent Android devices.
           Try it, you'll like it !!!!
Mar 2017
   TDT Tool  and   TDT Saturation            Updated

Feb 2017
   Formation Tester Basics             New Page
Log Analysis for Frac Designn   New Page
   Free Publications                     New Article in LPS Newsletter

Jan 2017
   Production Logging Basics          New Page

Dec 2016
   Shareware Fee          Policy Change

Sep 2016
   Capillary Pressure         Update
Free Webinars resume 08 Sep for Fall and Winter Semesters

Aug 2016
   Geothermal Reservoirs         Update
SI Units Definitions               Update

May 2016
   New Website Design

Apr 2016
   Overpressure     New Example
   Permafrost         New Example

Mar 2016
   All Saturation and Elec Props Pages       A, M, N values from Asquith 1980 added

Feb 2016
   Porosity from Sonic Logs       Fluid Travel Time added
   Crain's Integrated Petrophysics Videos       New Page

Jan 2016
   Added Page Views Counters - all pages
Crain's Integrated Petrophysics Lectures       New Page

Dec 2015
   Updated "Orders" pages

Nov 2015
   Updated page indexes - all pages
   Electrical Surveys       Pulsator added
   Low Resistivity Pay     New Page

Oct 2015
   Water Resistivity              Update
   Water Chemistry Analysis    "
   Capillary Pressure                 "
   Tight Oil / Shale Oil Analysis "
   Radioactive Sands                   "
   Resistivity Image Logs             "
   Dipmeter Logs                           "

Sep 2015
   Holgate Plot     New Topic

Aug 2015
   Net Pay / Productivity    New Page
   Lithology from Vp-Vs      New Page
   Capillary Pressure          Updated
   Porosity from Vp-Vs       Updated

June/July 2015
   Updated all course descriptions
           and order pages
May 2015
   Abbreviations - Logging   New Page
   Abbreviations - Seismic   New Page
   Search Button added      all pages
   Navigation Pane added  all pages  
   Link mouse-over and links visited
   CEC / Qv Math            clarifications

Apr 2015
   Chapter 1: 5 New Sections
   META/TVD Spreadsheet     Fixed Bug
   Clay Type Analysis
   Visual Analysis - Lithology

Mar 2015

   Log Normalization       New Page

   Depth Shifts                 New Page 

Feb 2015

   Jenkins-Lucia Permeability   New Page

   Permeability Spreadsheet     New Page
   Gamma Ray Vsh Models
   Gamma Ray Response
   Calibrating Saturation - Pc
   Calibrating Saturation - Core

Jan 2015

   Infra-Red (FTIR)
   Core Saturation
   Capillary Pressure

   Picking Perfs - Flow Capacity

Dec 2014

   Course Dates
   Total Organic Carbon TOC
   Seismic Attributes

   Become An Associate Instructor

Page Views ---- Since 01 Jan 2015
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