Unsolicited comments from website users are listed below. We also accept constructive criticism and corrections. Don't be bashful. Technical contributions from the petrophysical community are welcome. Updates to existing topics or new topics will carry full credit to the author, subject to editing for style, clarity, and brevity.

JUMP TO:    2021-2024    
2020     2019     2018     2017     2016     2015 and earlier

FROM 2021- 2024 MAILBAG

"Thank you for all the work you do. I’m a software developer that’s worked in various O&G products including running the development of Interactive Petrophysics. Your site is the most pragmatic source of PP knowledge I have found." - A.L., UK

“You make easy to understand explanations of difficult things and I believe that majority of the package will be needed to me in the future.” I.R., Trinidad

“I am a chemical engineer that has been in the oil patch for 25 years. I did not take a single geology class at University – everything I know I have learned from you!” A.B., Houston

“Just want to say thank you for making so much of your knowledge of petrophysics available. As a new petrophysicist in the Chevron training program, it is my go-to for filling in the blanks when I need something just simply stated and easy to find.” T.O., Texas

“You have supplied me and the rest of the oil and gas industry an amount of information that cannot be quantified.” D.L., Texas

“I appreciate my Pocket Pal and Cement Integrity Tools. It’s truly amazing the way you make petroleum engineering understandable.” G.P. Texas

“Love your work. Always thought of you as one of our great industry mentors.      Student.” L.L., Texas

“I highly recommend this course! Crain’s teaching style is clear and effective, and the content is gold for any budding petrophysicist.” D.I., USA

:I only use your website about once a month.  But when i do,  it's always for something important and you usually have what i need. Keep up the good work” D.C., Abilene

"Your courses and material have helped me a lot through my studies in a local petrophysics Msc.  I highly recommend everybody from juniors to senior petrophysicists take your courses as they are the highest quality I have found. They are very reliable and it is the only resource and body of knowledge that I know for sure it is always up to date. I will have this for the rest of my career and I appreciate you have put your experience with so much effort  and made this accessible for the rest of us. Your legacy will continue guiding us petrophysicists for generations."  

C.A., Brazil

“I must say that you have been an ornament to our industry over the long term. Realise that you have been well deserving of your CWLS Lifetime Achievement Award.  You have helped deconstruct the nuisances of the subject matter so as to simplify technical terms that are digestible into bite size pieces so most SS technical folk to understand. A gift in and of itself. Hence a personal heart felt thank-you for what you have achieved and how you have supported the subject of Petrophysics / Reservoir Engineeting over the long term.“ J.R. , Perth

“Your website is truly an amazing resource for geoscientists and just a fantastic contribution to the industry.”  J.K. Houston

“I am so thankful for the information that you have spent a lifetime learning and passing on to us 75-year old youngsters!” 

D.S., Rolla, MO.

“I had the privilege of experiencing one of your training sessions, which left a lasting impression on me. The depth of knowledge shared, and the practical approach adopted in the training was remarkable.” 

G.B., Calgary

 "I’d like to express  my appreciation to the great effort you did and doing" … SPEC2000 is “to go place” to understand a lot about PP … great. effort.


"Thanks again for all you’ve done over the years.  I’m a retired guy and trying to brush up on my well logging - just something to keep the brain engaged.  Spent too many years as a manager/exec and some of the basics have faded.  Your website is really helping me."

 E.B., iCloud.

I have been using your site for many years and I really love it because there are many things in it which I normally cannot find elsewhere."

S.S., Spain

"I very much enjoy your handbook. It has been very useful during my academic studies"

E.R,. Texas

"I would like to thank you for the great efforts that have been done to collect al sources of petrophysical related topics in one place and been explained in a very easy way. Everytime I have to explain something to my team, I used to see how you have explained even if I am sometimes an expert in it but your way of explaining things is definitely better and more straight forward."

M.O., Aus.

"Thank you for putting together your petrophysical website!!! It is a great resource!."
 A.H, CA

"So appreciate my Pocket Pal and Cement Integrity Tools. You are truly amazing the way you make petroleum engineering understandable.”

J.P., LA.

"I would like to use this mail to let you know how valuable your petrophysics website has been for drafting the manuscript for me. Thank you very much for the great webpages you created. I have learned so much about well-logging and petrophysics in general; far beyond what can be taught within a semester at a university. My passion for it has increased the more I read! "  

M.H.,  Geneva





“I have enjoyed and used your handbook over the years and have appreciated the effort you have put in to keep it very useful and I have just paid for continued access. It has provided a valuable service to our industry practitioners.”


“Your site is a good "go to" site when I need a refresher and to see how you handle petrophysical issues.”

M.M., Denver

"I am very willing to pay for a subscription to your information as you have supplied me and the rest of the oil and gas industry an amount of information that cannot be quantified."

D.l,. Calgary

"I really learn a lot from the site. Its great stuff!." M.P., OKC

"Love your work. Always thought of you as one of our great industry mentors."  L.L.

"I  very much value your expertise and the use of your website."  M.L.

"I've turned colleagues to your site - it's really a fantastic wealth of knowledge.

K.N,. Midland

"Appreciate for you handbook – especially for the Historical overview of logging history."

A.B., Tyumen

"I have been using your website for the last 20 years and just want to say what a great resource your website is."

 D.S., Houston

"You are doing great job! Thank you for the website. From your website I see that you make easy to understand explanations of difficult things and I believe that majority of the package will be needed to me in the future."  I.R., gmail

“Your website is a valuable resource. I was looking at your page on PE Density and was paying somewhat more attention to formulae than I usually do and came across your comment "Note - 1 barn = 1*10^ -24 square centimeters - pretty small cows!" and I paused and thought to myself: Small cows? What the heck is he talking....Oh, NOW I get it!. Thanks for a little levity - it made my day in this pandemic, work-at-home environment.”

W.P., via AOL


“I have found The Handbook invaluable in my work. I recommend it in my courses I teach. Thank you for all the help through the years. I think it is a masterful work!”

T.L., gmail

“We appreciate what you do with your website - very useful when you get projects in where you don't have previous experience.”

B.B., gmail

"Your website is a tremendous legacy to log analysis and a tribute to the craft of Petrophysics. I personally know what a fantastic resource it is."  C.W., Calgary

“I like the convenience to check your database when I need it. I am retired now but like to do software testing and independent projects.”

T.S., yahoo

“Just want to say thank you for making so much of your knowledge of petrophysics available online. As a new petrophysicist in the Chevron training program, your website is my go-to for filling in the blanks when I need something just simply stated and easy to find.”

T.O., Texas


“Greg told me about the lifetime achievement award from the Canadian Well Logging Society. Congratulations! It is well earned and deserved.” S.U., Denver

“I have often run across your Handbook – thank you for your efforts to help the industry.”

D.S., Texas

“Thank you very much, Ross. Your Handbook is excellent.”

M.C., Denver

“Your site has been very helpful, Mr. Crain, and I’ve passed the word on to several colleagues.”

B.C., Texas


“Thank you for the information you provide through your website. It has helped me greatly through my career as a general reference, and to look up meanings of terms. There is so much information out there, and you have done a fantastic job consolidating, explaining clearly, and providing a wonderful narrative.”

C.W., Denver

“Thank you very much for the Cement Bond webinar, I am an exploration geologist with curiosity to learn CH logs and this webinar has really been outstanding in developing my fundamental ideas about these logs. The way you narrated made them simple otherwise I have read them many times in books and partially understood, Great Job. You are an accomplished professional Ross.”

A.W., gmail

“I use your website all the time – thank you for the content!”

C.A., Houston

“I have been referring CPH for quite long and it has been really helpful to me in understanding unconventional formations better. Thank you so much. Keep up the good work.”

Y.B., India.

“I have to congratulate you for your Petrophysical Handbook. It's very useful.”

G.N., gmail

“Ross, if you ever get down to Denver give me a shout. I know what kind of effort you have put into your website and it is definitely a good resource.”

J.B., Denver

“I have been using your online Petrophysical Handbook periodically and it has been very helpful. Today I used it to review the Wylie-Rose perm equation, and I didn’t have to dig out my notes. I am a reservoir engineering consultant currently retained by ….. I was trained in Amoco’s petro school back in the day. I just wanted to drop a note and say hello, let you know I appreciate your site, and I realize I should pay you some $$’s for the use of your site.”

D.S., Houston

“As I wrote to you couple of years ago, your Handbook help me a lot to my degree and my thesis was about Petrophysics and since then is my favourite Science. Your collaborative work is amazing and I wish more people around the world can share knowledge with others, like you do. Thinking on this kind of things, I started share with Geologist students from a Student Chapter of UFRRJ (Rural Federal University of Rio de Janeiro) a bit of my experience in oilfield and my knowledge of Petrophysic and Formation Evaluation. Off course your Handbook its my first reference for the students. I’m sure will have more enthusiastic geologists in petrophysics in the near future in Brazil. I can not fail to mention, how it helped in my professional career as well! Once again thank you!”

P.M,. Brazil



“Your website, "Crain's Petrophysical Handbook" is very helpful to us students. I like how user-friendly it is and the explanations are pretty straightforward and easy to understand. I just have this sudden urge to thank you! Thank you for your time and sharing your knowledge.”

T.S., Malasia
“In this semester I take Petrophysics course and your Petrophysics Handbook is really helpful for me to learn and do assignments about it. And with this letter I would like to thank you for giving your knowledge and ease us to learn by your eLearning website. Oh, and also warm greetings from my lecturer.”

A.N.H., Surabaya

“I would like to thank you for your incredible website where you have collected tons of useful data for petrophysical analysis.”

V.L., Edmonton

“I am a petroleum geologist and have found your website extremely valuable over the years”

M.A., Australia

“I’m studying a Masters in Petroleum Engineering and funnily enough a lot of the course work references your website!.”

J.O., gmail

“Thank you for your taking the time to create Crain's Petrophysical Handbook website. It has been very helpful to myself and and many others.”

R.E., Denver

“I am amazed with the work you have done for learners at all levels in the field of Petrophysics. May God bless you with best health.”

M.J., gmail

“Thank you for your great contribution and education for the entire industry.”

F.Z., gmail

“I came across your web site recently as part of work related to a set of projects on which I am working. You have an impressive amount of information collected and made available. Thank you for sharing your decades of experience. [I did happily pay the modest shareware fee].” P.B., Houston

“I just purchased a shareware licenses for your site. This site and you are a life saver. My professor uses animated power point slides that are neat in class, but fall short when you need to study and the animations no longer work in pdf format…. I appreciate you sharing your knowledge and taking the time to explain every aspect of Formation Evaluation so clearly from "In the beginning". After poking around a while I decided sixty bucks is a bargain to have a clear conscience; I can tell your site encompasses the topic enough to be my main source for information through the rest of my studies and into my career. A real bargain. I unintentionally kept taking little peaks at stuff on here until I realized I was not going to stay away. I went from being frustrated with Formation Evaluation to it being fun after looking at just a few of your topics. This learning aid has what all of my books are lacking; worked out examples of the most basic concepts. I think a lot of authors just get so good at a topic that they make assumptions that one thing or another is obvious. Some concepts are, after you have seen and applied them a few times. It is exactly what I needed to get in gear. Thanks for getting that.”

C.C., Texas

“Thanks!  I am a chemical engineer that has been in the oil patch for 25 years.  I did not take a single geology class at University - everything I know I have learned from you!  I truly appreciate all the effort you have put into your site and the accompanying documentation.”

A.B., gmail

“I am sporadic user of your website and a tremendous admirer of your work. The information in the website as helped me a lot in the past, and would like to contribute with my fee.”

I.A., gmail

“I am glad to pay my share of the costs.  I am a chemical engineer / mineral processing engineer working in the oil and gas services industry - cementing.  An unrelated project requires that I start learning well logs.  Your site will be an important part of my information resources.  I plan to buy some of your educational materials too.”

E.B., Duncan OK


First of all let me thank you for your Handbook, the material in it is very clear, well presented and has been very helpful to me so far.”

R.C., Mexico

“I just want to say my greatest gratitude and thanks for compiling the best petrophysical materials online ever. They are really handy and very very comprehensive.”


“Hope one day do a course on site with you, your handbook helped me a lot at my degree and now I return my studies to improve my skill. Thank you.”

P.M., Brazil

“I have no words to explain how important you have been in my life in getting me close to Well Logging principles! I stand on brink of becoming a Geoscientist, with a stable life, and good package! But I have to pass an interview before joining as a Geoscientist, and your online handbook is just great aid to my preparations.

N.S., India

“I have found very interesting this site for the purpose of self-education. And currently there are list of coming webinar lectures provided. Many thanks.”

A.A., Kazakhstan

“By the way, myself and about a hundred other geologists I know want to thank you for creating your spec2000 website.  There is no other resource like it anywhere, and it is definitely a huge resource for those of us wanting to wade into the deeper end of the petrophysics pool!”

J.E., Denver

“I'm writing this to thank you for online Crain's petrophysical handbook. I was looking for conversion of Water Salinity to resistivity and found it on your page (https://www.spec2000.net/05-4rwmethods.htm#b5). I must say there is lot of engineering stuff available which is everyday need of petroleum/reservoir engineers and geologists. Thanks for this service and contribution to spread knowledge. Thanks for this service and contribution to spread knowledge.” 

M.N., Pakistan

“Every time that I opened a page, I truly believed my internet explorer simply reconnected to your site.  I am reviewing many of your pages.  As much as I can while pumping on location anyway.  My instructor was adamant about how useful we would find your site.  From everything that I have seen, he could not be more on target.  Thank you very much.” P.A., Colorado

“Hi again and appreciate a lot what you are doing for PP's World. History will remember you really.”

D.A., Egypt

“I cannot stress how much valuable the content that are posted in your website. I cannot count  how many times I have visited your website to understand things that weren’t clear to me and as I search in Google the first things that I see is your website. Thank you for everything, I wish if in our industry we have more  people like you that are welling to share information as much as you did, publicly.”

M.B., gmail

“Thank you for your website - it's been very instrumental in my continuous effort to learn to do well log analysis.”

M.F., Texas

“Thanks for your excellent petrophysical handbook. I refer to it in a submitted presentation for the forthcoming EAGE in Vienna and thought it as more than appropriate to pay for your work.”

V.H., Netherlands

“Thank you! Your data, and calculations will be the last chapter in my Bsc thesis (and of course I will refer you). I cannot say enough times "Thank you!". You saved my life.”  

V.R., rocketmail

“Many thanks for your website and CDs, I constantly find them useful and they have been a very worthwhile purchase.”

P.G., Adelaide


It is a pleasure to be in contact with you. First of all, I must thank you for your petrophysical handbook on-line, it is very useful for all students and petrophysicist."

R.R., gmail

"First of all, I wish to thank you for your excellent website! Indeed, I use it for many years and I have found most of the time all the answers to my questions."

R.T., France

I would like to once again thank you for the wonderful work you do! I frequently refer to my copy of Crain's Petrophysical Handbook."

A.N., Russia

"I wanted to thank you for putting together such a great petrophysical reference for everyone on the internet to use. This semester I was the team manager of Montana State Universities Imperial Barrel Award team. When I wasn't delegating tasks for my teammates, I was in charge of petrophysics and volumetrics. Your website solidified my knowledge on many petrophysical concepts, including shaly sand phie and sw. My team also utilized your website to become better petroleum geologists." R.H., Montana

I have to thank you for your website spec2000.net where i found answers for many questions. I am reservoir geologist working in Algeria. Many thanks.

A.J., Algeria

I am an Applied Geophysics student from Nigeria, and I really enjoy and appreciate your contribution to the development and enlightenment of earth scientist."

A.O., Nigeria

Great website! Thanks kindly for the resources."

C.C., Ireland

My sincere thanks for your excellent resource and generously shared expertise."
 B.H., Pittsburgh

"I so appreciate Petrophysical Pocket Pal because of how much I am learning from you about logs. So much better than my MSPE courses because every page is about real world application."

J.P., Oklahoma

I just want to say my greatest gratitude and thanks for compiling the best petrophysical materials online ever. They are really handy and very very comprehensive. You are among the few that make our world a better place. And I thank you for that. Thank you for making our world a better place."


"I love your www.spec2000.net so much and I learn a lot from here. Thank you so much for your contribution for life."

N.V., Vietnam

"Thank you for your considered effort over the long term wrt to educating the wider global O&G industry.

Your are a credit to our industry - Thank you."

G.H., Houston

"I'd l
ike to thank you for your generosity. It is really outstanding, and one of the most integrated resources for Petrophysics that I have ever come across. I decided to specialize in rock physics, and many thanks to you and your effort."

M.M., Egypt

"I'm an ardent fan of yours. By profession I'm Petrophysicist. I usually work with ElanPlus as my analysis tool. But I always do hand calculation first. And whenever i teach new persons i insist that he/she should visit ur site and learn petrophysics the way it should be learnt. To me u r the Richard Feynman in Petrophysics."


"I'd like to express sincerest and deepest gratitude for your website on petrophysics, which actually covers a lot more very useful topics related to petroleum exploration and production. I've been referring to your website for a couple of months now and it proved to be very informative and helpful. I have made up my mind to pay the shareware fee which is only fair taking into account the dedication and huge effort you've put into this resource."
 A.S., Russia

"I really enjoy and appreciate your contribution to the development and enlightenment of earth scientists."

O.S., Nigeria

"I have to thank you for your website spec2000.net where i found answers for many questions. Many thanks."

A.L., Algeria

"I mail you to thank you a lot for your highly appreciated PE/PP website.
Really I can't find the right words to describe how much valuable your
 website is."

D.A., Syria

"I appreciate the work and experience that you have shared with the industry through your website; the content of the website has been a valuable resource to our evaluation program and speaks highly of your intellect."

W.M., Dallas

"During my search, I stumbled onto one of your write-ups on potash and it was really awesome, it was quite a piece." A.O.

"I studied your work as a student whilst at College- You are a Petrophysics legend."

A.L., UK

"I wish to say your handbook on petrophysics is unique and the best."
A.I., Capetown

"Your website and CD-ROM Handbook have proven invaluable to me in a number of projects in the Permian Basin and Arkoma Basin. Everything is so well organized and thorough that I am able to resolve petrophysical questions much more quickly than digging through my old books and files! Thanks again for your leadership in this area."

C.K., Texas

"Your website is like the Smithsonian Library of well log information."
 A.M., Calgary

"I love your website!  I teach a petroleum geology course here at CSU and recommend it to my students." 

J.G., Bakersfield

“My thanks to you. Your website is a wealth of great information and tools. It's clearly a "labor of love" for you and a treasure for any of us lucky enough to find it.”

E.C., Houston


"Thank you for making such good reference/educational material available to people like myself a "working geologist."

D.P., Indiana

"Let me start off by saying how helpful your petrophysics website has been to me and how grateful I am that you took the time to do it."

J.V., Illinois

"I stumbled upon your website on Crains Simplified rules for log interpretation. I am a junior geologist and just entered the oil and gas industry a year ago upon graduating. I just wanted to let you know that this website was VERY VERY useful and very well put together in a clear, concise and easy to read manner. Thanks a bunch!"

S.P., Calgary

"I would like to thank you for your efforts. I found a lot of useful information and this helped me in work and in personal development. I wish you good health, success and prosperity!!!!!"

A.B., Russia

"First and foremost, I need to extend my gratitude to your effort on publishing the online handbook. Without it, I'm sure a lot of young log analyst would be at lost, including me."

J.L., Brisbane

"Thank you so much for your site – I am using it very often. What I like the best is a not very complicated language so I can understand just everything that is written unlike usual books on petrophysics, especially in Russian."

N.L., Russia


"My sincere thanks for your excellent resource and generously shared

B.H., PA

"I have learned a great deal from your AV-01 course and I feel it has been a great investment in my time and money. I only wish we would have had something this comprehensive offered during university."

J.V., Calgary


"I am one of your big fans and your site is a great reference for me and for thousands of people, god blesses you and keep it up."

S.H., Egypt



A.H., Calgary


"I found your website whilst in a jam working on a project that needed an immediate answer. I was fascinated by the techie material, really useful – I was after old 3 legged dipmeter hints, and I found just what I needed." D.F., Indonesia


"I stumbled upon the Petrophysical Handbook looking up some XRD articles in Google. I have to congratulate you for such an excellent description of the methods!."

 J.A., San Diego


“I write to thank you for your excellent site at Crain’s Petrophysical Handbook which has been, indeed, a truly handbook. The practical-yet well documented site has helped me a lot into understanding many concepts I wasn’t familiar with and to remember of fortify many others I have work with.“

 M.G., Mexico


“I would like to express my sincere gratitude for all the efforts you have taken during my recent coursework. I really appreciate the way in which you helped me to learn  logging  which was one of the subject I always dreaded.  Now I love this course.”

G.D., Calgary


“I can't tell you how much I appreciate your direction on a petrophysical development program. As soon as I received the CD that you had given as the solution and I am sure that I can get them to work when demonstrate the potential of these knowledge. I must say I admire your courage and initiative and thank you personally.”  I.N.


 “I received my score on the assignment for which I had asked help from you. I scored a 9.6 on a 10 point scale. Your suggestions were really helpful in getting this high score. Thanks a lot.” J.R.


“Many thanks for all the amazing information on your site.  I am constantly pushing people your way!”

 G.S.,  UK


"We were lucky when we finally found a wonderful source of information and incredibly useful tool - your site Crain's Petrophysical Handbook. I would like to thank you, personally and professionally for your work which helped me understand the complex universe of unconventional reservoirs."

M.H., Croatia


"I am teaching rock properties this semester for the first time and learned a lot from your online material. It is of very good quality, extremely well organized, easy to follow and complete. Congratulations."

M.P., Tulsa


"Your materials on petrophysics is the best in the world....  In my keen search, I have not found something better. Thank you for putting that treasure (knowledge) together and making it accessible."

V. F., Nigeria


"Thanks Ross, I was going to check myself into "The Institute For The Petrophysically Challenged" but then I found your site".

L.S., Azerbaijan


"Ross, you are like some sort of Rock Star here.  I already have more people for the basic log course than I can comfortably fit in the room.  We need to book a second session."  

R. S., Calgary


"I am a regular user of your Petrophysical On-line Handbook....  I really want to go high in this field and your pedigree is what attracts me most. Thank you as I pray for your prolonged stay on earth such that your contributions will keep touching lives in this domain of geoscientists." S.C., Nigeria

"Can I just say what a fantastic site you have. I’ve spent about 20 minutes running through it and unfortunately the grind pulls me away for now but it’s in the favourite box waiting for a couple of hours free time. Very useful and a fascinating life story. Thanks for sharing."

S.P., Surrey, UK.


"This is the greatest log analysis web site that I ever seen, thank you for that".

S.A., Calgary

"I do some consulting and often run across your website during “searches”. It is a very nice piece of work and probably the most comprehensive and readily accessible reference on logging, etc. that I know of. CONGRATULATIONS! 

T.F., San Antonio

"I have started reading your website and I have learned a lot. Much more than what I could learn in the school, Thanks for sharing your knowledge with others."

V.S., Texas


"My congratulations for your web site, very well organized and simple to understand."

G.J., via gmail


"I would like to congratulate to this very informative web site. It is wonderful that you make your expertise available using this media."

B.B., Potsdam, Germany


"I was delighted with the CD you sent to us. It goes perfectly with my expectation. That is certainly one handsome desk set you sent me. Whenever I sit down at my computer desk, It makes me feel like a big shot, reading all the petrophysicist stuff in your site. Thank you for your thoughtfulness and generosity." 

I.V., Saudi Arabia

"I thank you very much for useful website. I gained very useful information about image logs..... I am very grateful for your help."

M.S., gmail

"I had previously purchased your shareware Petrophysical Handbook back in September and have been impressed with your outline and presentation  of petrophysics and well log interpretation methodology." B.J., Calgary.

"My name is Fatima and I'm work in an oil company. I read some chapter of your book and it help me alot. I appreciate you for that."

I have been using your manual for a couple of years and like the way you explain most things in a way a geologist can understand so I wanted to finally send the payment." 

T.M., Calgary

An excellent and stimulating website – thanks"

P.W., Kent, UK

"I'm very impressed with this book. Thanks for making it available."
A.F., Casper, WY

"Thank you Ross and great handbook by the way, very helpful for mentoring young guys.  I get so many questions and I don't always have the answers and this helps." 

Serge, Moscow, Russia

"Great site! Lots of good stuff that I needed.  I ordered your CD, excellent value",

Barry J., Calgary

"I am a Petro-Technologist with a geological background and I am really interested in Petrophysics. Your Petrophysical Handbook is just the right tool for me to educate myself. It is fantastic! Thank you!"

G.K., Texas

"Enjoy your web site and the wide range of topics and depth of understanding contained in your petrophysical pages." 

T.W., yahoo

"I ordered your Petrophysics CD-ROM handbook about a month back and its great! I'm developing a Petrophysics module for my company's modeling software and your algorithmic presentations are so useful for that purpose...Just wanted to drop a line and say thanks!"

S.D., Texas

"... thanks for putting on your course last week.  I’ve gotten lots of good feedback from our staff, who all liked the presentation, and found the information really informative."

D.K., Calgary

"I just wanted to thank you again for the great job you did here.  Everyone really got a lot out of your course and I even overheard the engineers saying they would like to get you back next year to teach the rest of their group."

S.W., Calgary

"Though CRAIN'S PETROPHYSICAL HANDBOOK is a comprehensive reference, full of math and scientific facts,  I find it written in a simple comprehensible way, even for young inexperienced Geologists."

M.W., Egypt

"Very nicely written handbook.. I have been an analyst for 17 years and I am learning new things every day."

J.T, Texas

"Thanks a lot. Your book is a definite must for anyone in petrophysics."

David D, Texas

"Amazing site. Wish I had found it earlier. Will be sending some questions shortly."

J.T., Texas

"Thank you for the extremely easy way of ordering the CD. I look forward to receiving it and putting the information to use."

E.V., Texas

"I'm very impressed with the contents and the approach of writing the book."
H.D, India

"I have used your site a number of times, the Pocket Pal is very useful, especially for quick lookup when I am working on a logging problem.", T.C., Colorado

"I really think your website is great!!!"

 B.M., Texas

"I would like to say that I enjoy your website. Out of the many websites I have been searching, yours has brought me closest to my answer."

J.D., Montana

"Your educational material is outstanding. I was going through it this morning as a review for a potential fresh water / shaly sand project in Malaysia."

G.B., Texas

"I have gone through some of your publications and materials published. I am really impressed with the Handbook."

P.K.S., Indonesia

."I would like to thank you for all the work that went into your Log Analysis Handbook. It is one of the standard reference I use with great regularity."

F. A. A, Middle East

"I am very much astonished to see your online book about petrophysics. You have done a tremendous job by displaying your book online cost free . I congratulate you on your bold step - best of luck."
I.N., Pakistan

"I received your report this am, fax copy came through OK too. Let me say that I am impressed by the forthright nature of your conclusions and by the turnaround time. Thank you."

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