APPLICATION OF COMPUTER DATA ANALYSIS
TECHNIQUES TO DIGITIZED WELL LOG INTERPRETATION
OF DEVONIAN CARBONATES
B.M. MCVICAR
this article begins on the next page F
PAPER NO.
TECHNIQUES TO," DIGITIZED WELL
Publication Rights Reserved
prior to the conclu-
reduction in well log. computing costs and an
6801
PETROLEUM,SOCIETY OF
0
CIM
SUBJECT, TO,
INTERPRETATION OF DEVONIAN
is to be presented at the 19th
CORRECTION
THIS
IS
A
PREPRINT
OF
COMPUTER
-DATA
Marshall Development co. Ltd., Calgary, Alberta
in CIM journals if filed in writing with the Technical Program
ANALYSIS
APPLICATION
CARBONATES
This paper
BY
B. M. McVicar, P. Eng., Member CIM
Allison-
for
Annu
sion
al Technical Meeting of the Petroleum
of the meeting.
Society of CIM in Calgary, May 7-10,1968. Dicussion of this paper is invited.
Such
discussion may be presented at the l9th Annual Meeting and will be considered for publication
is the
Chairman
compatible
with the computer, for improvement of the processing.
A
major
problem in processing log data
ABSTRACT
initial
of graphs
preparation, calibration,
allows interaction
normalization
and
A
editing. Once the
data
is
in
computer
exchange of techniques between profession is
previously too cumbersome. The
accel-
form
and
exonerated,
many
convenient
manipulations
eratiug
that branch
carbonates requires
the
use
of
The
aids
computers in intepretation.
A
can be made. These are best
presented
in
graphic
industry
such as Time Series
analyst then
raw
new computer pro
applicable to log
Analyals and Multivariate
analysis ban
el@na:-
for
st
F
ourier
Transformation
Canadian prospects,
data screening and new opportunities
give Important local
tion of extrdne6us-data and the:amooth:Lng and eri@
eccdomlml'digitlzed
encourage computer-log
form. Visual analysis
Pa
allows
economic
sequences
application
of
several
processes
digital approach
to
'seismic analysis provides
complexityof
lithologies At the same
taken.
digital processing
f= loga,-
capability
Devonian
In
paper covers
general
These
techniques
techniques
which
can
rapid
of
the
oil
directly
be applied to western
Anal-
be
and
have
anaylsis.
classifi-
The
been applied to Devonian carbonate sequences
permit
and
economic
ysis. Statistical procedures
now
available
contrib-
pe@'ba
help,
has with
easi:er
to
cation and correlation.'
data allows
rec6@tion
dete=ination
Significant
of errors
correlation
of
dramatically
ution of various logs to
co@elation@
in
the choice
desired end result. Many
Co@@tlon'and-cldss-
the-we'of Linear-Pro~i@.
of
log suites
and deriv-
large amounts of data with
references
are
such
as
core
ation
of
porosities
and
time,, the impersonal contact that the
made.
These
_
guidance as
INTRODUCTION
to the
contribution
or lack
of datd.-:,Tbis
@ge-Acale
attracti" and
of
the
raw
a
variety
ng
a
and
distortions
price breakthro@
facilities,
to
prevail
unless
well
precautions
of
started@,a."naissance.
are lndreasingly@vailable.
the tools
are
computer
These.factors
simple
and
straightforward.
biomedicine -and tsycbolog& d,an, be cipp@ied diredtly
con- s@emi -Seol,ogiml mEcpping'techniqudd'mn,be
They
allow recalibration
of.
idpilt:data,
the
Libraries
-bluing
hancing
organized.'
ofire@B@and
in-
@irs
i968
Once
a
in
log
@nd
lfimtion.techniquee
con@en:lences.,
taken
eatimtes
from
of
such
scieticeecas
are"a@la-ble
of
log.analysts.
o:t
to
logs
we
being.
cmwuter
necess@
the
oflitbol6iW.
.@s
Is
trbved
th@o@
with,tbeir,econ@es
lithology
we
ex-
a@ñB
and
fres@
plotted.'
general
techniques
made
\
i
·
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'.
·
"
,
·t
,
I
PAPER NO. 6801
PETROLEUM ,SOCIETY OF elM"
I
1
1
..,
i
THIS IS
A
PREPRINT
-
SUBJECT'TO,CORRECTION'
,
"
APPLICATION OF COMPUTER DAT.A, ANALYSIS
".
.
-.
. -
'
,
.,'
.
\.
{f,t;
\,Y
j
TECHNIQUES TO,:' DIGITIZED, WELL LOG' .
,
.
INTERPRETATION OF DEVO,NIAN CARBONATES
By
,"
.
M. McVicar,,' P. Eng." Memper eIM,
;Al1.ison':'Marsball Development Co. Ltd,., Calgary" Alberta
J
,
PubUcation Rights Reserved
,
,I
This. paper
to be presented _at the 19'th Annual' Technical Meeting of -the Petrolel.1ID'
Society of CD! in Cslgary, i.Ry 7-10" ;1.968. ' DiscUssion of tbis paper is invited.
"'I
disc.ussion rray be. presented at' .:t1;le 19th Annual MeetiOg' ana will be -considered for pUblication•
,,r:j
,
'
"
\
in CD! journals 'if
'si,on at tbEL
Writing' Witb the Tecbnical Program Chairman 'prior to'the conclu-
,
'
-'
.
- , . -
,j
.... "1
,
,
.
, . ·A major problem in processing log data is the
normalization and
editing. Once the data· is in computer compat;J.ble
form and many, convenient manipul.ations
can be made. !These .are best presented in graphic
form •.. -:Yisual of graphs allovs 1:nteraction
.
initial preparation,.
J
. A reduction in well. 1og. computing' costs aM· an
exchange ot:
between professi'ons is accel•
,erating the -Utesechonfiques'
qomputers> in- interpretation.
new· computer progl:oa.m, for Fast FOurier .Transfo:rma."tion.
appliCation of seveial· proce'sses
previously'too cumbersome. The digital- approach to
'seismic analysis prciv'i.des capability_ in that branch
1
)
.j
'With the computer' for improvement of .the
i
I
The paper',covers general techniques 'Whicb can
be, applied to western caoad:f,an prospects", and have
been applied to DevoU1an carbonate sequences.a :!he·
complexity· of Devonian carbonates requires aids
Time series Analysis and Multivariate ·Anal•
nov,·available help
.
of' the' oil industry'direotly applicable to log
"
atialYB.i.S ..
,
(.
.
These techniques permit rapid and economic·'
·data screening and new opportuni-ties for classifi•
'cation and correlation.. Si"gnificant correlation. of
large amounts of data Yith' references such as core
j
.
>,
,
"
1
,I
'
dramatically in the.choice of·log.suites and .deriV•
ation of porosities and
atia.lyais Can be' J:!1ade. These
local
time, the ,impersonal con1'act that the analys=t then
i
has· 'With. the raw ·da.ta,.allows
a ..variety, of 'errors
guid,anc·e as to -the contribution or ""!'ack of contrib•
utiqn' logs -to 'a desired' end result.. Many
of tbe ·,tool"s are simple and'stra.lghtforward .. They
and. distortions to prevail unless precautions are
taken.
"
'"
'
alloW reealibration. of- raw input':data, the el1mina-
i
of extraneous '-data.' and.. the :smoothing 'and·
•
INTRODUCTION
bancing 'of' de. tao :'>Thls permits' easi"er ·recogm,tioD.
of 1rend:s
ifieatioD.·tecbniques 'taken-from such
correlatioD. -', Correlation:and ,¥class•
,- nuring i968
a
price
in
log
digital pr.ocessing ,star:ted;.a -renaissance- of computer
log 'analysis. .ot economical'digitized
loga. !U"e being, organized.' Large-s,cale' computer
ana conveniences',
"
.
b19medicine and psychology qan.. be aPP1:-ied
to the determination of'lithology. ,'!his is im-
'proved tbrcn1gb -the
-
use"of" Linear'Programmirig
0
•
Once
facilities, ;with'. their
are increasingly:available.· These. factors are com-
b:tning to encourage computer log an.aJ.Ysis and fresh
gene:;al _techniques made attractive and
,
es:timates of-, lithology .are"aVaila,ble :rrom'loga".
several geol.ogieal mappingr techniques' can 'be ex-
.
.
'
,
,