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SUMMARY OF RESULTS FROM A
THERMAL GRADIENT SURVEY OF
THE SAN EMIDIO WEUS
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WASHOE COUNTY, NEVADA
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submitted to
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CHEVRON OIL COMPAW
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August, 1976
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Allan M. K a t z e n s t e i n
Subir K. Sanyal
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P r o j e c t No.
76.112
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GEONOMICS , I N C .
3165 A d e l i n e Street
Berkeley, C a l i f o r n i a 94703
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DISCLAIMER
This report was prepared as an account of work sponsored by an
agency of the United States Government. Neither the United States
Government nor any agency Thereof, nor any of their employees,
makes any warranty, express or implied, or assumes any legal
liability or responsibility for the accuracy, completeness, or
usefulness of any information, apparatus, product, or process
disclosed, or represents that its use would not infringe privately
owned rights. Reference herein to any specific commercial product,
process, or service by trade name, trademark, manufacturer, or
otherwise does not necessarily constitute or imply its endorsement,
recommendation, or favoring by the United States Government or any
agency thereof. The views and opinions of authors expressed herein
do not necessarily state or reflect those of the United States
Government or any agency thereof.
DISCLAIMER
Portions of this document may be illegible in
electronic image products. Images are produced
from the best available original document.
SUMMARY OF RESULTS
This summary d e s c r i b e s t h e r e s u l t s c Itained from a
temperature g r a d i e n t survey of t h e San Emidio wells d r i l l e d
i n Washoe County, Nevada. The temperature g r a d i e n t survey
w a s performed during t h e month o f July, 1976, by Geonomics,
I n c . , for t h e Chevron O i l Company. The approximate l o c a t i o n
o f t h e survey is shown i n Figure 1. A t o t a l of two h o l e s were
d r i l l e d (S.E. #A and S.E. #B) w i t h l o c a t i o n s p l o t t e d on
Figure 2.
Logging o p e r a t i o n s , which c o n s i s t e d of rock sampling and
temperature-depth determinations, were undertaken by
Geonomics, I n c . w i t h d a t a being presented i n the following
appendices :
--
Appendix I
D r i l l i n g Operations Log f o r each Hole
Appendix 11
Sample I d e n t i f i c a t i o n from each Hole
Appendix 111- F i e l d Observed Temperature from each
Hole
.
Appendix I V
Uncorrected Temperature from each
Hole
Appendix V
Uncorrected Temperature Gradient
Computer Calculations f o r each Hole
-
I n a d d i t i o n , Table 1 p r e s e n t s v i t a l s t a t i s t i c s f o r each hole.
Both o f t h e San Emidio h o l e s were d r i l l e d in a l l u v i a l
f i l l surrounded by relatively f l a t terrain; t h e r e f o r e , no
t e r r a i n c o r r e c t i o n s w e r e made on t h e temperature d a t a and the
thermal g r a d i e n t s remain uncorrected. A core w a s taken from
S.E. #B, b u t due t o t h e sedimentary c h a r a c t e r of the area
and sample, no c o n d u c t i v i t y o r d e n s i t y determinations were
c a r r i e d o u t , and, t h e r e f o r e , no h e a t flow is c a l c u l a t e d f o r
t h i s a r e a . Also, a t the r e q u e s t of the Chevron Oil Company,
no f u r t h e r i n t e r p r e t a t i o n is given on t h e d a t a beyond t h i s
p r e s e n t a t i o n of t h e c a l c u l a t e d thermal g r a d i e n t s .
.
-42-
-
41.
-40-
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--:39'
-38'
--37
Figure 1.
L o c a t i o n map of San Emidio Prospect.
APPENDIX 111
TEMPERATURE DATA; FIELD OBSERVATIONS
Table 1
SUMMARY OF VITAL STATISTIrZS
Date completed: July 28, 1976
Bottom hole depth: 500 feet ( 1 5 2 . 4 meters)
Date of l a s t temperature measurement: J u l y 31, 1976
Bottom Hole Temperature: 112.3OF (44.6OC)
Temperature probe used: Geonomics*
Uncorrect thermal g r a d i e n t : 154.2OC/krn
Uncorrect thermal g r a d i e n t (depth of 50 f e e t and below):
149. I°C/km
S.E. IFB
Date completed: July 2 9 , 1976
Bottom h o l e depth: 176 f e e t (53.6 meters)-coring depth
Date of l a s t temperature measurement: J u l y 31, 1976
Bottom h o l e temperature: 222OF (105.6OC)
Temperature probe used: Geonomics*
Uncorrected thermal g r a d i e n t : 1134. O°C/km
Uncorrected thermal g r a d i e n t (depth o f 50 fe!et and below):
1187.OoC/km
_9cEnviro- l a b s , I n c . -.
Model DT-101, Digital
Thermometer
Range: O - l $ O ~ C 3
0
Accuracy: -
Figure 2.
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Location of the San Emidio d r i l l h o i e s .
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TEMPERATURE DATA
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TIME
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Temperature,
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APPENDIX IV
UNCORRECTED TEMPERATURE VERSUS DEPTH PLOTS
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Temperature,
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140
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APPENDIX V
UNCORRECTED TEMPERATURE GRADIENT COMPUTER CALCULATIONS
.
COMPUTER TEMPERATURE GRADIENT/HEAT FLOW CALCULATIONS
Computer O u t p u t Format:
Depth
= Depth’in meters t o position i n borehole.
For uncorrected case, depths are i n accordance
w i t h raw data. For steady state case, depths
are from a computed function due t o topographic and
geol ogi c corrections
.
Temperature = Corresponding temperature a t given depth i n
OC.
. -
Smooth
= Machine generated smoothed temperature in
Residual
= Difference between temperature and smoothed
temperature i n OC.
Grad
= Calculated temperature gradient i n
Ster
= Value of two student T-tests for 95% confidence limit.
95Cl
= 95% confidence limit.
OC.
OC/km.
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Note: Ster and 95Cl = 0 when only one value i s used.
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APPENDIX I
DRILLING OPERATIONS LOG
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. . .. . . . . . . .
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IC. 75-192
WELL LOG
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J Y E L L LOG
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3 1 6 9 Adaline Street, Berkeley, CA 94703
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TIME
TIME
DEPTH
COMMENTS
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IC 75-19?
WELL LOG
bEONOimrCS, INC.
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3165 Adeline Street, Berkeley, Cd 94103
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DRILLING
TIME
\
TIME
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DEPTH
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CaMMENTS
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IC 75-132
ELL LOG
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INC.
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CA 95703
i Adeline Street, Berkeley,
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COMMENTS
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IC 75-192
E L L LOG
~ E O N O M I C S INC.
,
J.5 Aduline
b Street, Berkeley, CA 94703
b
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WELL NO.
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TIME
DEPTH
COMMENTS
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IC.75-192
WELL LOG
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WELL LOG
DRILLlNG
TIME
TIME
DEPTH
COMMENTS
DRILLING
TIME
TIME
DEPTH
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COMMENTS
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10/75-192
L LOG
JOB No.
EONON;ICS, INC.
imo Street, Berkeley, CA 94703
DATE
J
(76 i I GL
I0/75- 1 92
LOG
DEPTH
TIME
..
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COMMENTS
\
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WELL LOG
I0/75- 192
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TIME
TIME
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COMMENTS
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I 0/75- 19 2
ELF LOG
-
EONOMICS, INC.
Adeliae Street, Berkeley, CA 94703
DATE
.
..
-
WELL LOG
-
10/75-192
__
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I O/75- 192
WELL LOG
JOB No.
~ E O N O M I C SINC.
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3165 Adeiine Street. Berkeley, CA 94703 =
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WELL No.(
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TIME
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DEPTH
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COMMENTS
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A P P E N D I X I1
SAMPLE I D E N T I F I C A T I O N FROM DRILL HOLES
IO/75-192
WELL LOG
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._-
l0/75- 192
WELL LOG
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WELL LOG
DRILLING
TIME
TIME
10/75-192
?
DEPTH
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COMMENTS
ELL LOG
I 0/75- 192
:LL LOG