Petrophysical Training
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Unsolicited comments from website users are listed below. We
also accept constructive criticism and corrections. Don't be
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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
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2020
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2016 2015 and earlier
FROM 2021- 2022 MAILBAG
"Your
courses and material have helped me a lot through my studies in a
local petrophysics Msc I am pursuing at my hometown, as well as
during some petrophysics modules I had in a Geosciences course I
took in Argentina this year. I highly recommend everybody from
juniors to senior petrophysicist to take your courses and I can tell
they are the highest quality I have found around, 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 on
it and made this accessible and possible for the rest of us, your
legacy will continue guiding us/" C.A. BVpetrophysicist for
generations.
"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. ffort.
E.N., UAE
"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 it
somewhere else." 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
definately 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
|
FULL DISCLOSURE
In 21 years online, this is
the only bad review received:
"If the website worked as advertised, i would renew,
however, considering the results that i experienced, it
is not likely i will renew or recommend to associates."
Reply: "Tell me what's wrong and I'll fix it". (No
reply)
------------
One email and a reddit post complained about the use of
"computer-ready" math instead of classical equations.
We live in the computer age. Why use yesterdays tools to
solve today's problems? |
FROM 2020 MAILBAG
“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.”
K.S. NSW
“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
FROM 2019 MAILBAG
“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
FROM 2018 MAILBAG
“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've to congrat 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 knowlegde 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 Formantion 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
FROM 2017 MAILBAG
“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
FROM 2016 MAILBAG
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.” F.N.,
UAE
“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
FROM 2015 and EARLIER
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."
F.N., UAE
"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.,
Viet Nam
"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
J.R., Perth
"I'd like 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." Shishir
"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, im 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
expertise." 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 t
his 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
"THANKS FOR ALL YOUR GREAT
MATERIAL!!!!!!!!" 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 recieved 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., via
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.
"Hello, How are you? 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,,
via 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
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even overheard the engineers saying they would like to get
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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
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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
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very impressed with the contents and the approach of writing the book."
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have used your site a number of times, the Pocket Pal is very useful,
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