New Mexico B u r e a u of Mines and M i n e r a l R e s o u r c e s
O p e n F i l e R e p o r t No. OF-261
GEOCHEMICAL EVALUATION OF THE C I T I E SS E R V I C E
1 RIDLEY A WELL, ROOSEVELT COUNTY, NEW MEXICO
NO.
q-2
s- 3 3 E
By James E .K e a l ,
R o b e r t s o nR e s e a r c h ,
H o u s t o nT
, exas
March 2 8 , 1983
Jr.
Inc.
ROBERTSON RESEARCH
(U.S.)
INC.
R E P O R T NO. 8231231
GEOCHEMICALEVALUATION OF T H E
CITIESSERVICE 81 RIDLEY"A"
WELL, ROOSEVELTCOUNTY,
NEW MEXICO
by
J. E. Kea1
P R O J E C T NO. R R U S / 8 2 3 / T 1 2 3 1 / 2
P r e p a r e d by:
R o b e r t s o n R e s e a r c h (U.S. 1 Inc.
1 6 7 3 0H e d g e c r o f t ,S u i t e
306
Houston, Texas 77060-3697
March 28, 1983
Prepared for:
C i t i e sS e r v i c eG m p a n y
Box 1919
Midland, T e x a s 79702
TABLE OF CONTENTS
PAGE NO.
INTRODUCTION
1
DISCUSSION
CONCLUSIONS
RECOMMENDATIONS
Figures
1. OrganicCarbonandVisualKerogenPlots
2'. Rock-Eval Ppolysis Plots
3. Kerogen Type from Pyrolysis Data
4. VitriniteReflectanceMaturationProfile
5. Zones of Oil and Gas Generation
Appendices
I.
Organic
Carbon
Data
11.
Rock-Eval Pyrolysis
111. ReflectedLight Microscopy Data
IV.
TransmittedLight
Microscopy Data
9
11
13
20
INTRODUCTION
Cutting samples from the
Cities
Service
#1, Ridley "A" test well,
Roosevelt County, NewMexico were received and analyzed by Rot,nrtson
Research (U.S.) Inc. in order to determine the source
rock potential of
the section penetrated.
Most
of
the section penetratedbytke
well
consisted of red beds and organicleanintervals,thereby
makin? most
intervals' unsuitable for detailed geochemical analyses.
Preliminary dataresults
March 2, 1983.
were phoned to
Cities
Service
Midlard,
on
DISCUSSION
OrganicRichness
Thirty-three sampleswereanalyzed
fororganicrichnessbetweer
1,750
and 7,425 feet. All of these samplescontained very low organiccarbon
richness (t0.5 weight percent)andarethereforeratedasnorsource
rocks(Figure 1).
Organic Matter Type
Four samples analyzed byvisual
examination of thekerogenindicate
that large amounts of amorphous kerogenplusexiniteexistin
relation
toother maceral types(Figure 1). Often,highconcentrations
of these
kerogentypesareassociated
with oil-generatingcapability;hcwever,
the concentration of amorphous kerogenplusexinite
is not adirect
measurement of the amount of hydrogenthat is present which actually
-1-
determines the oil-generatingcapability.Thesesamples
2 , 9 5 0 ;3 , 9 5 0 ;5 , 0 8 5 ;
and 6 , 5 1 5 feet. All of theother
visually contain terrestrial, dry
arefomdat
samples aralyzed
gas-generatingkerogen.
Kerogen typingbypyrolysis(Figure
3) suggeststhatthekercgen
in
most
of
the samples is hydrogen deficient and is predominant1:r gasgenerating.The
sample at 3 , 9 5 0 feetcontains wet gas-generatingkerogen.
Kerogen Maturity
Kerogen maturity can be determined by
vitrinite
reflectance
spore coloration index (SCI) and Rock-Eval pyrolysis (T-max).
petroleum generation
and
destruction
can
be
correlated
using
these
three methods (Figure 5 ) .
T-max is usually areliable
method fordeterminingmaturity
(Ro)
Zones of
in samples
Because theFe samthat containreasonable amounts of organicmatter.
ples areorganiclean,the
S2 peaks, from which the T-max is measured (Appendix II), are oflow amplitude making an accurate determination of T-max difficult.
(R,) is the most accurate method for determinVitrinitereflectance
ing kerogen maturity and generally
can be used when very little organic
material is present in the samples.Thegenerationzones
shown in Figure 1 areestablished
from thevitrinitereflectanceprofile
shown in
Figure 4.
Data indicatethatthe
section reachesthe
oil-gex?eration
window at approximately 3 , 0 0 0 feetandthedry
gas preservation limit
occursat approximately 10,000 feet. Projection of the maturationprofile tothesurface
shows that approximately 1 , 6 0 0 feet of overburden
has
been
removed; however, this figure could be
altered
if more
reflectance data were a v d a b l e from the upper part of section.
-2-
The SCI dataat
6 . 5 1 5 and 6,935 feetagree
well with thee.trinite
data, but the shallower samples are more mature than would be expected
when compared to the maturation trend established byvitrinite
reflec-
tance. These
shallow samples probably contain oxidized and/or reworked
organic material. This seems reasonableconsidering the amount of red
bed intervals found in the section.
CONCLUSIONS
Cuttings samples from the CitiesService, #1 Ridley well arevery lean
in
organic
material and
classified
as nonsource
rocks.
Most of the
organic material that is present is the
terrestrial,
gas-generating
type. The depthrange from the commencement of oil generationto the
d r y gas preservation limit is between 3,000 and 10,000 feet.
No potentialforhydrocarbongenerationexistsinanypart
of the sectionanalyzed;however,lateralfacieschanges
may containpotential
source beds.
RECOMMENDATIONS
We recommend that geochemical follow upstudiesbe
done on lateral
wells and/or wells thatpenetrateadeeper
part of the section in order
to identify potential source beds that
may exist.
-3-
P1 RIDLEY
D
E
P
TYPE
%
f
IH
S$:i-
0-
MINITE
]I
1
'A'
11
HATURITY
CENCE
INTENSITY
1
1
1
BENERATION
SOURCE RICHNESS
(%
O R B A N ICCA R B O N )
0.5
1.0
I
I
1
1-
1-
"
"
2-
lates
3-
SNDR
-
_
.
GLRT
4"
CLFK
5-
Tubb
Abo
6-
1-
UFMP
_
.
csco
-
7-1
IIL/DN
PRECAH
""
T.D.
0-
-
..
..
..
9-
FIGURE I : SUMMARY PLOTS SHOUING KEROGEN TYPES, MATURITY,
ANDSOURCE RICHNESS (SEE APPENDICES I AND I II)
-4-
I
I
I
I
I
..
N
# I RIDLEY “ A ”
;::::t
800
Y
YRD 1080
R
; 600
i
-
1I.OlL b 0 5
-
E
N
I
N
400
-
200
.
0
D
E
X
o o
0
25
0
0
50
a
0
0
175
75 150
150
125
125
100
288
OXYGENINDEX
FIGURE 3, KEROGEN TYPE DETERnINATION FROR ROCK-EVAL
PYROLYSIS DATA (APPENDIX 1 1 1 .
dl
3
aOO
a00
Y
D
tI
l1,OlL L C S
R
i
RIDLEY “ A “
600
N
400
3
E
X
0
0
0
0
50
I00
158
200
250
300
350
400
OXYGENINDEX
FIGURE 3, KEROGEN TYPE DETERRINATION FROn ROCK-EVAL
PYROLYSIS DATA (APPENDIX 1 1 1 .
- 6-
# I RIDLEY ' A '
~ A T U R A T I O NP R O F I L E
DENERATION
ft
'ILf: 1 3888
8558 f t
Z
E.8
E.8
4:
8.8
2.E
BIS
--
4ZW PI
8857 f l
DRI
I
I
I
I
I
I
, ,
I
, ,
2
I
I , ,
MATURATION PROFILE, BASU) ON VITRINITE
REFLECTANCE DATA (APPENDIX111 1
-7-
1.8
--
SI46 ft
US I
3
.
2 IF33?ft
R A N D O RH E F L E C T A N C E
n.4
I
FIGURE
yn
ZONES
I
3
4
, , , , , , , , ,L
d
.
L
ZONES OF PETROLEUM
GENERATION
AND
DESTRUCTION
I 1
ORGANIC MATTER TVPE
AMORPHOUS (OIL) MIXED
COALY (GAS)
HUMIC
LIPlINIlIC
FIGURE 5:
CORRELATION OF VARIOUS M T U R A T I O NI N D I C E S
AND ZONES OFPETROLEUMGENERATIONAND
DESTRUCTION.
- 8-
APPENDIX I
TOTALORGANIC
CARBON DATA
Totalorganiccarbon
is determined by pulverizingthe sample, treating
a carefully weighed portionwith w a r m hydrochloric acid to remove carbonateminerals,andanalysing
the residue for carboncontent
witha
Leco carbonanalyser.It
is generallyacceptedthat
samples with less
thanabout
0.5 percent TOC cannot yield sufficient petroleum to form
commercial deposits and arethereforeconsiderednonsources;sanples
with between 0.5 and 1.0 TOC are rated as
marginal in source qudity;
and sanples with more than 1.0 TOC are considered to be good in s3urce
quality.
- 9-
TOTAL ORGANIC CARBON DATA
# 1 RIDLEY "A"
DEPTH
(Feet)
TOC
DEPTH
TOC
(%)
(Feet)
(%)
1750
2050
2250
2465
2650
0.14
0.16
0.09
0.07
0.09
5850
6050
6256
6315
6365
0.23
0.21
0.21
0.22
0.12
2950
3250
3450
3750
3950
0.13
0.09
0.33
0.12
0.32
6435
6515
6625
6715
6845
0.26
0.26
0 . 16
0.15
0.13
4250
4320
4..
55
.0
.
4850
5085
0.06
0.07
0.08
0.07
0.11
6935
7005
7095
7195
7295
0.40
0.16
0.12
0.12
0.24
5350
s550
0.00
0 . 09
7425
0.14
-10-
APPENDIX I1
ROCK-EVAL P Y R O L Y S I SD A T A
Rlock-Eval data are expressedasmg/g
of rockandincludefourbasic
of freehydrocarbcnspreparameters: 1) SI representsthequantity
sentin the rock and is roughlyanalogousto
the solventextractable
portion of theorganicmatter;
2) S2 represents the quantity of hydrocarbonsreleased b y the kerogen in the sample during pyro1:rsis; 3)
S3 is r e l a t d t o t h e
amount of oxygenpresent in thekerogen;and
4)
T-max is thetemperature at which the maximum rate of generntion (of
the S2 peak)occursandcanbeusedasan
estimate of thermal maturity.
In addition, ?he ratio S 2 / S 3 providesageneralindication
cf kerogenquality(type)andrevealswhether
oil or gas is likely to be
generated.
The
ratio
S1/(S1+S2), o r the
productivity
inlex,
is
an indication of therelative amount of freehydrocarbons(inplace
or
migrated) present in the sample. Hydrogen and oxygen index values are
mg of hydrocarbons ( S 2 peak) or carbon.dioxide
(S3
expressedas
peak) per gram of organic carbon. When piotted against each ot’ler on a
van Krevelen-type diagram, information on kerogen type and matcrity can
be obtained.
Key for data Interpreiatlon:
- values
Source
Potentlal
Petroleum Type
of S2
- values o f 52/53
Q.5
: poor
2.5-5.0
>5 .O
<2.5
:
2.5-5.0
Generatlon Zones
- values
Prcductlvlty Index
hydrocerbons.
>5.0
of
T-max
(OC)
<435
435-470
4% +
marginal
: good
: dry gas
: wet gas
: oil
: lmnature
: 01 I
: gas
- nlgn values o f Sl/(Sl+SZ) indlcate migrated
-11-
ROCK-EVAL
PYROLYSIS
2050
2950
1 . 2 8 40 . 0 8 3 3 9 5 0
0.161
5085
0 . 4 005. 1 000. 0 3 55 8 5 0
51
DATA
"A"
# 1 RIDLEY
(D FE EP ET TH )
RAW
T-MAX
5 2 5 15/ 2( 5/ 51 3+5S3 2 )
0.571
0 . 01 33 790 . 1 9 70 . 0 2 7
0.120
0.041
403. 22 7 30 , 2 5 5 0 . 4 4 0
0.306
4.193
0.295
0.198
0.247
0.059
46 2
39
1
0 5. 303. 4107. 9302. 7005. 90 2 9
0
1.200
8.080
8 . 0 3 46 5 1 5
6935
0.032
0.072
0.023
7295
0.362
0.199
0,019
0.061
0.734
0.258
414
433
425
0.307
0.552
432
430
HYDROGEN AND OXYGEN INDICES FROM ROCK-EVAL
P Y R O L Y S I S D A T A , WITH T O C D A T A
# l
DEPTH
(FEET)
RJDLEY "A"
HYDROGEN INDEX
(mg n c l g TOC)
2050
2950
3950
5085
5850
401
53
43
6315
6515
6935
729s
27
34
18
8
OXYGEN
INDEX
TOC
(mg C 0 2 l g T O C )
0.23
123
210
96
268
176
0.24
149
80
91
94
17
92
0.32
-12-
(%I
0 . 16
0.13
0.11
0.22
0.26
0.40
APPENDIX 111
REFLECTEDLIGHT
MICROSCOPY DATA
A sample of groundrock
is treatedsuccessivelywithhydrochlori-,and
hydrofluoricacidstoconcentratethekerogen,freeze-dried,mcunted
in an epoxyplug,andpolished.Kerogentype
is identifiedwith
aid of blue light fluorescence.
the
Thevisualkerogen
analysis data table contains visualpercentageestimates of each principle kerogen type and kerogen background fluorescence
data.
This
data
is also displayed on the histograms with relative
amounts of solidbitumen and cokedmaterial.
The
histograms
show measured
reflectance
values
of all vilrinite
presentand
on all material
with
thevisualappearance
of vitrinite.
Shadedvalues(markedwith
*) arethoseusedtocalculatetheinterpreted
vitrinite
reflectance
maturities.
Unshaded
values
are
interpreted
to
be oxidized vitrinite,
recycled
vitrinite,
o r possibly misidentifiedmaterialsuchassolidbitumen,pseudo-vitrinite,
o r senifusinite.
When samples
analysed
contain
no vitrinite,
nonindigenous
of readings to allow ar?liable
vitrinite or have an insufficientnumber
maturitydeterminationtobemade,thenthe
mean value f o r that sample
is shown as N. D. (Not Determined).Alternatematuritycalculatioxsare
possible on a few samples.Thehistograms
are identified by a Rob?rtson
Researchsequencenumber
(RRUSNo.)
and depth o r othernotaticn.
ABBREVIATIONS USED IN VISUAL KEROGEN
.4NXLYSIS DATASHEET .LUD HISTOGRAXS
Am
Ex
:
Vit
Inert
:
:
:
R,
:
Bkg Fl :
Amorphous
Kerogen
Exinite
Vitrinite
Inertinite
Vitrinite
Reflectance
Mean in Immersion O i l
Background
Fluorescence
-13-
VISUAL KEROGEN ANALYSIS
# 1 RIDLEY
Project No.
~~~
~
~~
~~~~~~~~
-
REFLECTED LIGHT
"A"
: RRUSI823ITI231102
~
~
~
S A M P LIED E N T I F I C A T I ORNE F L E C TK.E R O G ECNH A R A C T E R I S T I CTSO
Ro %
R RDUESP(TFHe e t )
Am%
C
E x % VIInte%FrItu%o r
%
2
6
10
15
18
2050
2950
3 9 5~.
0
5085
5850
1.23
0.00
0.00
0.00
0
600
20
40
0
tr
V Hi
High
0.16
80
99
99
tr
tr
0
0
0
tr
High
V Hi
0. 3 2
0.00
"
"
21
6315
6515
6935
7295
1.32
0.64
1.55
1.66
60
20
25
30
5
401
5
60
5
15
Ned
Ked
0.22
0.26
30
tr
35
35
2 4.
~~
28
32
~~
30
-14-
"
"
--"
LOW
LOW
0.13
0.11
0.23
0.40
. 0.24
El
RIDLEY "A"
REWORKED
1.0
0.0
4.0
3.0
?
RRUS NO.
:
DEPTH
I
MEAN
2
t
2050.0
624.8
a
N.D.
Ft
ti
HISTOCRAR:
Range: 0- 4%
Increment, 0.10%
2.0
VITRINITE REFLECTANCE IRANDOR X 1
ORDERED REFLECTANCE VALUES:
KEROGEN DESCRIPTION
0 %
Amorphous I
Exinite
0 %
Virrlnlte I
40 X
Inertlnl te I
60 X
0.92
Each Fluor
81 lumen
Co he
81
N
R
8
I
I
V High
None
None
RIDLEY "A"
25 1
RRUS NO.
I
DEPTH
I
MEAN
6
I
2950.0 Ft
899.2 n
I
N.D.
15
I45
G
S I 0 j
0'
a'. 0
, , , / , , , , / ,
I .0
, , , , , ,
,,,,,,,,,,,
2.a
, , , ( , , , , 1
4.03.0
HISTOGRAPII
Range, 0- 4%
Increment, 0.10%
VITRINITE RE.=LECTANCE (RANDOPI% I
KEROGEN DESCRIPTIOI'
80 %
Amorphous I
I
20 %
Erlnite
0 %
Viirlnlre I
I
1r X
Inert inlte
ORDERED REFLECTANCE VALUES:
Each Fluor
E I lumen
Co
he
-15-
I
j
l
Hlgn
None
lr
El
RIDLEY
"A"
25 7
E
!
R 20:
RRUS NO,
:
DEPTH
I
nEAN
I0
3950.0 FI
I
1204.0
I
N.D.
ll
0 15f
F
EA
Nf
S
C
'01
5;
0' . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I .0
2.0
0.0
3.0
4.0
VITRINITE REFLECTANCE (RANDOPI X 1
ORDERED REFLECTANCE VALUES:
HISTOCRAPTt
Rangel 0- 4 %
Increment) 0.i8X
fiE2OGEN DESCRIPTION
Amorphous
I
Exini te
Vitrlnire
Inertinlre
Back Fluor
8 I rumen
Cone
E l
:
89 X
~r X
I
0 %
I
0 %
I
Hlgr
HlgF
I
None
I
RIDLEY "A"
RRUS NO.
DEPTH
MEAN
I
15
I
5085.8 F?
I
1548.9
I
N.D.
PI
15
1
25
HISTOGRAPI:
l[1
0
0:0
,..,.
,
I
..,,,..
/.,,...,...,
,
I
,,,.
1'0
2.0
3.0
VITilINITE REFLECTANCE (RANDOPI 11
ORDERED REFLECTANCE VALUES!
T.0
Range, 0- 4 1
Incremenr : 0.i0::
KEROGEN DESCRIPTIOI'
99 X
Amorphous I
I
lr X
Exinire
0 %
Virrlnlle I
Inert inite I
tr X
Buck Fluor
8
E i lumen
I
Coke
-16-
I
V High
ned
Non?
SARPLE
AFTER ACID
NO
RRUS N o .
I
DEPTH
2
FIEAN
18
t
5850.0
1783.1
I
N.D.
Ff
PI
F
!
, , , , , , , , , /
2S
0
0.0
I
,,,,
.a
3.0
,,,,,,,,/,,,,,,,,,,
6.0
2.a
HISTOGRAM,
Range! 0- 4%
Increment, 0 . 1 0 %
VITRINITE REFLECTANCE IRANDOPI % I
KEROGEN DESCRIPTIOb
Amorphous I ? 2 2
: ? 2 %
Exinite
Vitrinlfe I ? 2 X
Inerrlnife I 7 2 X
ORDERED REFLECTANCE VALUES:
Back Fluor
B i lumen
Coke
RRUS NO.
DEPTH
I
I
I
X
PIEAN
ST3
DEV
flEDIAN
PIODE
2.a
VITRINITE REFLECTANCE
3.0
IRANDOPI X 1
ORDERED REFLECTANCE VALUES;
0.49
X 1 .06
XI. I4
X1.38
XI .38
11.17
X1.21
X I .59
TI
4.a
I
I
?fled
?Small
?Small .
21
6315.0
1924.8
Ff
fl
= Ro RATURITY
VALUES
a.O
:
13
I
1.32
a. I E
:
1.33
I .3E
I
HISTOCRAPI:
Range, 0- 4?;
Incremenr: 0 . 1 0 5
KEROGEN DESCRIPTIOI
30 X
Amorphous ,
Exinire
5 %
Vitrinite > ? 40 X
Inertlnlte I
25 X
.57
1.62
Back Fluor
8i lumen
Coke
T l .30
X1 .30
*I .33
X I .34
T1.35
-17-
I
nea
nea
I
tr
I
.
25
-
nl RIDLEY "A"
20
CAVING
?
t
DEPTH
8
MEAN
;l 5
I !
!
s
0
0.0
RRUS NO.
24
I
6515.0
1985.8
I
N.D
Ft
M
HISTOGRAM)
Range, 0- 4%
Increment, 0.10%
4.01.0 3.0
2.a
VITRINITE REFLECTANCE (RANDCn X1
,
KEROGEN DESCRIPTION
60 X
Amorpnous I
4
30 X
Exinire
5 %
Vitrinlre
5 X
Inertinlte I
ORDERED REFLECTANCE VALUES,
0.54
0.75
j
Back Fluor
B 1 rumen
Co he
nl
-
25
RIDLEY
"A"
I
I
ned
nee
None
'
RRUS NO.
t
DEPTH
:
I
0
I
6935.0 Ft
2113.8 n
X
= RO MATURITY
fl
VALUES
15
F
28
26
I
MEAN
DEV
PlEDIAN
nODE
STD
1.5E
0.14
I .54
1.45
:
I
HISTOGRAPI:
Range, 0-
O.a
1.0
3'.a
VITRINITE REFLECTANCE LRANDOn
'
4'0
4%
Increment, 0.102
%!
KEROGEN DESCRIPTIOV
Amorpnous I
20 X
5 %
Exinire
Virrinite I
60 X
Inert inite I
15 X
ORDERED REFLECTANCE VALUES:
0.52 X1.45 71.59 T I . 8 7
0.81 T I .47 ~ 1 . 6 0 2.a5
2.24
71.31 XI.47 Xl.63
71.48 T I .64
X1.31
X1.38 X I . 4 9 Xl.65
x1.40 Xl.50 Xl.67
31.41 7 1 . 5 4 Xl.69
Xl.42 Xl.55 Xl.75
11.43 X I .58 Xl.78
x1.43 Xl.58 71.79
Back
-18-
Fluor
I
Low
8 i lumen
I
Small
to he
a
None
RRUS NO.
DEPTH
32
I
7285.8
Ff
I
2223.5
i-l
T
= RO MATURITY
fl
VALUES
MEAN
STD DEV
MEDIAN
I
I
5
:
0. 14
I .66
I .65
:
I
NODE
!
5
0
, . , , , . , . . , . . , ? , , 8 " . , . . . , , ,. , . ~ . . , . . . . ,
0.0
1.0
210
3.a
VITRINITE REFLECTANCE IRANDOPI % I
4.0
HISTOGRAM,
Range I 0- 4 1
Increment: a . I 0::
KEROGEN DESCRIPTIOil
30 X
Amorpnous I
I
rr X
Exinlfe
35 X
Vitrlnlfe I
35 X
Inertlnite I
ORDERED REFLECTANCE VALUES,
* I .43
X I .64
71 .66
TI .67
* I .88
Back Fluor
B i lumen
Coke
-19-
I
I
I
LOW
Now
fr
APPENDIX IV
TRANSMITTEDLIGHTMICROSCOPYDATA
Transmittedlightslidesareprepared
with standard palynological techniques and SCI values on all spores and pollen present are recorded on
B 1-10 scale.
The basisforthe
SCI colorscale is hue, not i n t n s i t y .
A briefdescription
of the colors foreach of theten
SCI units is a s
follows:
SCI COLOR SCALE
1.
2.
3.
4.
5.
strawto pale yellow
yellow
yellow/orange
golden
amber
6.
7.
8.
9.
10.
-20-
reddish
brown/chocolatc
neutral brown
blackish brown
black
glossy black/graphitized
C I T I E S #1 RIDLEY
TRANSMITTEDLIGHTVISUALKEROGENANALYSIS
RRUS NO.
DEPTH
S C I RANGE
6
2,950
5-6
10
24
28
3,950
5-7
6,515
5-7
6,935
5-6
-21-