FINAL TECHNICAL REPORT PHASE II
GEOTHERlV1AL RESOURCE
EXPLORATION & DEFINITION
SB Geo, Inc.
DE-FC04-00AL66975
September 18, 2001
SLIM HOLE 24-33
Steamboat Springs, Nevada
Colin Goranson, Geothermal Resource Engineer
Stratigraphic slim hole 24-33 was drilled in the southwest corner of the Steamboat
Springs, Nevada Meyberg Property (see Figure 1). Drilling commenced on April 9, 2001
and ,vas completed on March 10, 2001. The ,veIl was drilled \vith a Bomi-Longyear core
rig. Cores \vere obtained from surface to total depth (TD) at 2,000 feet . Temperature and
pressure suryeys were ob tained on May 1.200l. Currently the well is bridged at 1,771
feet (the pressure/temperature tool would not pass this depth).
The slim hole completion is shown in Figure 2 . The well was completed with 4 112"
casing set and cemented to 250 feet. 3 1I2"casing was set and cemented to surface at a
depth of 771 feet. 2.9" hole was cored from 771 feet to total depth at 2,000 feet. Hole
problems were encountered below 1,81 0 feet. The hole is currently bridged at -1,800 feet.
Also shown in this figure are temperature versus depth data and a geologic description. A
description of the formations encountered is given in below Table 1.
Several fracture zones were encountered with noticeably large fracture apertures. These
zones are probable productive horizons. Actual productive horizons will need to be
determined during discharge or injection testing .
Figure 3 is a plot of the slim hole pressure and temperature versus depth. Maximumrecorded temperature is 320 of at 1,280 feet. The static vvellhead pressure is 35 psig. The
shallow temperatures versus depth data indicate that the water is boiling in the upper
pOliion of the well bore. The slim hole will discharge to the surface unassisted.
1
Appendix A has the daily drilling activity summaries and Appendix B has the Drilling
Supervisors Estimated Daily Drilling Costs. Total estimated well cost is -$170,000 spent
oyer a 28 day time period.
Further testing of the well is needed to determine productivity characteristics of this
portion of the Meyberg Property. The existing data indicates that a large thermal zone
with fluids at temperatures bet\veen 305 of to 321°F exists between depths of 500 feet to
1.500 feet.
J
SLIM HOLE 24-33
Steamboat Springs, Nevada
Colin Goranson, Geothermal Resource Engineer
Table 1 Geo ogic descnptIOn of slim hole MTH 24-33
Depth
Formation Description
(feet)
(from Peter van de Kamp)
0' to 20'
I Basalt. Red soil
20' to 108'
Granodiorite - altered, soft sandy texture
108' to 240 '
Granodiorite - altered gray-green, soft, feld spars altered to
clay, biotite altered to chlorite. Fractures w/dips of 40° to
80° are tight.
240' to 1890'
Granodiorite - Firm, hard, slightly altered to fresh, biotite
fresh to partly chlorized; feldspars fresh to partly altered
to clays. Numerous fractures, many with slickensides and
thin «1 /4") zones of mylonitized rock indicating
displacive movement. Fracture dips range from 40° to 900
with many> 60°. Many fractures have fillings of chlorite,
calcite and quartz.
Permeable fractures with openings of 1/8" to 1" wide
occur at 587' - 603',1039 ' - 1040', 1290' -1291' and
1809' - 1810 (lower pOl1ion of hole not logged as of yet).
In the interval from 240' to 1890' there are numerous
zones of 2' to 8' of core length with pervasive chlorite and
clay alteration yielding softer rock . These zones may be
associated with fractures.
Limestone-dolomite inclusions in the granodiorite occur at
1367' - 1375' and 1433" to 1436' .
r
I'
,/
,
)
I'
... .r-- -
r
,
,
-~,.
\.
\
... "
Rd
Figure 1) Location of Meyberg Stratigraphic Slim Hole MTH 24-33
'---
'
,-
Stratigraphic Hole MTH 24-33
Spud 9-Mar-01, TO 10-Apr-01
Elevation 4,850'
!-Temperature
,
i'
Temperature (OF)
50
75
100
125
150
175
200
225
250
275
300
325
°T
' ~~~~~~~~~~~~~~~~~~~~~~~~
o - 20' basalt
4 1/2" Flush Joint
casing set at 250'
250
Open
fracture
597'-603'
dip 70° - 90°
500
750
3 1/2" Flush Joint
casing set at 771'
-....
Open
fracture
1039'-1 040'
dip 70° - 90°
Q)
Q)
.......
..r:::
.... 1,000
C.
108' to 240'-----Granodiorite, highly altered,
soft. Tight fractures.
240' to 1,890'--------Granodiorite, firm, hard, lightly altered.
Biotite fresh to partly altered to clays.
Numerous fractures,
many with slickensides and thin «114")
zones of mylonitized rocks indicating
displacive movement. Fracture dips from
40° to 90° with many 60° dips.
Numerous fillings of chlorite, quartz and
calcite.
Permeable fractures w/open ings 1/8" to
1" wide occur at 597'-603'. 1039'-1040',
1290'-1291' and 1809'-1810' .
Q)
c
Open
fracture
1290'-1291'
dip 70° - 90°
1,250
1,500
1,750
Numerous zones of 2' to 8' core length
with pervasive chlorite and clay
alteration yielding softer rock. These
may be associated w/fractures.
Limestone-dolomite inclusions in the
granodiorite occur at 1367'-1375' and
2.9"
Open
hole
11't')~1
'1 A.-:>a'
Open
fracture
1809'-1810'
dip 70° - 90°
PBTD 1,771'
2 ,000
~~~_T_D_2~,_O_oo_'
________~____________________________________________~
Figure 2) Slimhole MTH 24-33 Completion, Geology and Temperature versus Depth
Stratigraphic Hole MTH 24-33
-
Temperature
- - Pressure
Temperature (OF)
200
225
250
275
300
325
O+'~~~~~~~~~~-~~~~~~-~-~~~~~~~~
1-May-01
250
500
750
-
-Q)
Q)
; ; 1,000
Co
Q)
C
1,250
1,500
1,750
PBTD 1,771'
TO 2,000'
2 ,000
+,
'-!.'...:..
' -'--'-'-'---'-'f-'-'...:..
' ....
' J' . . .-'--'-..i.-!-..f
' ' -'-'-.J...l,..J.-'-'-'--'-'"--'-'-'-'-.J....J....l....c...:..-'-'-'~-'--'--'--'-"-'--'-"""--'-~-'-l
J' . . .' - ' - ' - - ' - - - - ' ' - '' -+
' -
o
100
200
300
400
500
600
700
Pressure (psia)
IFigUre 3) Meyberg Slimhole MTH 24-33 Pressure and Temperature versus Depth Survey Data
I
SLIM HOLE 12-33
Steamboat Springs, Nevada
Colin Goranson, Geothermal Resource Engineer
Stratigraphic slim hole 12-33 \-vas drilled in the northwest corner of the Steamboat
Springs, Nevada Meyberg Property (see Figure 1) . Drilling commenced on AprilS,
200 I and was completed on April 19,2001.The well was drilled with a Boart-Longyear
core rig. Cores were obtained from surface to total depth (TD) at 973 feet. Temperature
and pressure surveys \vere obtained on May 1. 200 I.
The slim hole completion is sho\vn in Figure 2.The well was completed \vith 4 1/2"casing
set and cemented to 150 feet. 3 1/2" casing was set and cemented to surface at a depth of
500 feet. 2.9" hole was cored from 500 feet to total depth at 973 feet. Also shown in this
figure .are temperature versus depth data and a geologic description. A description of the
formations encountered is given in below Table 1.
Several fracture zones were encountered with noticeably large fracture apertures. These
zonc:s are probable productive horizons. Actual productive horizons will need to be
determined during discharge or injection testing.
Figure 3 is a plot of the slim hole pressure and temperature versus depth. Maximumrecorded temperature is 318 °F at 588 feet. The static wellhead pressure is 0 psig. The
well does not flow unassi sted and has not been discharge tested to date.
Appendix A has the dail y drilling activi ty summaries and Appendix B has the Drilling
Supervisors Estimated Daily Drilling Costs. Total estimated well cost is -$83 ,000 spent
over a 14 day time period.
Further testing of the well is needed to determine productivity characteristics of this
portion of the Meyberg Property. The existing data indicates that a large thermal zone
\\-ith fluid s at temperatures between 305 OF to 318 OF exists betvveen depths of 450 feet to
973 feet in thi s area of the Meyberg Property.
T a bl e 1 G eo
OglC (
Depth
(feet)
I
I
O to :2'
escnptIOn 0 f sr1m h o Ie MTH
1
12 -33
F ormation Description
(from Peter van de Kamp)
I Sandy soi l
2' to 77 '
I Soft altered granodiorite, sandy yello\v-bro\vn, clays, Fe-oxide
77'toI52'
Altered granodiorite. gray-green. clay alteration of feldspars
152' to 973'
Granodiorite - mostl y hard rock with minor to moderate clay
alteration of feldspars, mIca. Small faults and fractures are
common: most are tight. Fracture fillings include calcite and
quartz. Open fractures below 500 ' depth are partly filled with
quartz cement.
R20E
EXPLORATION
SLIM HOLE MTH 12-33
LOCATION
,
'.
r--"/
./
(
/~
/
/ .- i
,/
./
~.-.
~.
/
/ 1
'- '
_ _ _ _I
Legend
o
-,
Power Plant
1_ J
Lease Area
<
Production Well
>
Injection Well
00
Exploration Well
./'
.~
,
./
elevation contours in feet
Figure 1) Location of Meyberg Stratigraphic Slim Hole 12-33
Meyberg Stratigraphic Hole MTH 12-33
Spud 4/10/01 - Completed 4/17/01
Elevation 4750 feet
I
i-
.
MTH 12-33 .
Temperature (OF)
75
50
100
125
150
175
200
225
250
275
300
325
O+
' ~~~~~M'~~~~~~~~~~
"~~~~~
o to 2' Sandy soil
4 1/2" Flush Joint
casing set at 150'
250
3 1/2" Flush Joint
casing set at 500'
500
, ,.,
,
, i 2.9"
750
-
, ,.
, .,,
, .,
(I,)
(I,)
-
:t:..
J:
, :Open
,, ,.i hole
1,000
a.
Q)
C
1,250
TD 973'
open
fractures
541',552',
60° dip
open
fractures
744',770' ,
60° -70° dip
open
fractures
w/vuggy
structure
925',931' ,
953'-973'
60°-70° dip.
Quartz
cement 953'
973'.
2' to 77' - ----Soft altered granodiorite, sandy,
yellow-brown, clays, Fe-oxide.
77' to 152' - ----Altered granodiorite, gray-green,
clay alteration of feldspar.
152' to 973' - ----Granodiorite , mostly hard-rock
w/minor to moderate clay
alteration of feldspars , mica.
Small fauls and fractures are
common, most are tight. Fracture
fillings include calcite and quartz.
Open fractures below 500' depth
are partly filled wit h silica cement.
1,500
1,750
2,OOO~--------------------------------------------------~
Figure 2) Slim hole MTH 12-33 Completion , Geolog y and Temperature versus Depth
Stratigraphic Hole MTH 12-33
I--Temperature - - Pressure
I
Temperature (OF)
225
200
250
275
300
325
O+'-v~-~~~~~~~~~~~~-+~~~~~+-~~~~~
1-May-01
100
200
300
---
400
Q)
Q)
.c:
500
c..
Q)
c
600
700
800
900
TO 973'
1,000
~~~~~~~~~~~~~~~~~~~~~~~.+
' ~
' ~
' ~~~
o
25
50
75
100 125 150 175 200 225 250 275 300 325 350
Pressure (psia)
Figure 3) Meyberg Slimhole MTH 12-33 Pressure and Temperature versus Depth Survey Data
Meyberg Stratigraphic Hole MTH 21-33
Spud 1/17/94 - Completed 1/23/94
Elevation 4690 feet
-
MTH 21-33
Tem perature CF)
50
75
00
~
250
100
125
150
250
275
300
325
4 1/2" Flush Joint '-!'--.~
;
;
;
~ i
~ i
~ ;
~ i
! i
! ;
! ;
;
! ;
! i
~
324'- 330' open fracture , dip 75°-90°,
calci" and silica fillina
3.9"
Open
hole
~
567' ) pen fracture, dip 45°, vuggy porosity
~
596 ' 358' massive calcite , dip 75 °_90°
i
~- ~
---
225
~
~
~
750 -
200
casing set at 160'
! ;
500
175
TO 710'
708'- 10' open fracture, dip 75°, large vugs
vUQ ~: : e 0.25" x 1.5"
<I)
<I)
-
. J:
1,000 --
a<I).
Cl
1,250
1,500
1,750
2,000
Figure 3) Completion, Geology and Temperature versus Depth for Slimhole MTH 21-33
Meyberg Stratigraphic Hole MTH 24-33
Spud 3/16/01 - 4/4101
Elevation 4850 feet
-MTH 24-33
Temperature (OF)
50
75
100
125
150
o
175
200
225
250
275
300
325
o - 20' basalt
4 1/2" Flush Joint
casing set at 250'
108' to 240' Granodiorite, highly altere
soft. Tight fractures.
250
Open
fracture
500
597'-603'
dip 70° - 90° ,:-:'
750
3 1/2" Flush Joint
casing set at 771'
-
--=
-
Open
fracture
Q)
cu
1039'-1040'
1,000
a.
dip
OJ
::e~
9G"
Q
frac:ure
1,290'-1,291'
dip 70° - 90°
1,250
1,500
r
Permeable fractures w/openings 1/8" to 1" wide
occur at 597'-603' . 1039'-1040', 1290'-1291' and
1809'-1810'.
Numerous zones of 2' to 8' core length with pervasive
chlorite and clay alteration yielding softer rock. These
may be associated wi fractures
2.9"
Open
hole
Open
fracture
1,750
~.
240' to 1,890'--------Granodiorite, firm, hard, lightly altered . Biotite fresh
to partly altered to clays. Numerous fractures,
many with slickensides and thin « 1/4") zones of
mylonitized rochs indicating displacive movement.
Fracture dips from 40 0 to 90 0 with many 60° dips.
Numerous fillings of chlorite, quartz and calcite.
Limestone-dolomite inclusions in the granodiorite
occur at 1367'-1375' and 1433'-1436'.
1,809'- 1.810'
dip 70° - 90°
PSTO 1,771'
2,000
TO 2.000'
QDen fractures enc outered at TO
Figure 4) Completion, Geology and Temperature versus Depth for Slimhole MTH 24-33.
""'I
•
,
..
Meyberg Stratigraphic Hole MTH 12-33
Spud 4/10101 - Completed 4/17/01
Elevation 4750 feet
:-MTH 12-33
Te mperature CF)
75
50
100
125
150
175
200
225
250
275
300
325
OT
' ~~~----~---r--- ---------~------~~~~
o
4 1/2" Flush Joint
casing set at 150'
250
750
I
Q)
J::
open
fractures
744',770' ,
60° -70° dip
I
Q)
:=:..
: Open
i hole
,
,
-
I
1,000
c..
Q)
Cl
1,250
1,500
1,750 -
2,000
to 152' - ----Ai 'red granodiorite, gray-green,
ck i alteration of feldspar.
open
fractures
541',552' ,
60° dip
~ 2.9"
TO 973'
open
fractures
wivuggy
structure
925',931' ,
953'-973'
60°-70° dip.
Quartz
cement 953'
973'.
2' Sandy soil
2' i 77' - ----so r 3. ltered granodiorite. sandy,
yel! w-brown. clays , Fe-oxide.
3 1/2" Flush Joint
casing set at 500'
500
~J
T;
l
15
Gr
wi
alt
. to 973' - ----nodiorite, mostly hard-rock
'inor to moderate clay
ration of feldspars , mica.
Sr "til fauls and fractures are
cc l mon, most are tight. Fracture
fil ! :gs include calcite and quartz.
Or en fractures below 500' depth
ar partly fi lled with silica cement.