_Read Me by xiuliliaofz

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									Summary of Well Information

This well was positively identified from IDWR’s geothermal well list:
(www.idwr.idaho.gov/ftp/gisdata/Spatial/GeothermalResources/geothermal_snapshot.xls)

Basic Information:
TRS: 07S 41E 25 SW of SW of SW (250 ft NNW of section center)
Well ID: SUNHUB-25 (HUBBARD #25-1)
IDWR GT well ID: 540
Lat/long: 42.786700 -111.611700
Depth: 7544 ft (lith/temp logs are available to 7840 ft)

Well logs were obtained from Chad Hersley, IDWR (Chad.Hersley@idwr.idaho.gov; 208-287-
4930). The well was filed at IDWR under the name "Phillips Petroleum Co. 11-GR-1"



Well log materials in this folder:

Surveyed location (Surveyed_Location.pdf)
Daily detailed drilling reports (Daily_Driller's_Reports.pdf)
Well logs:
 - cable-tooled portion, 0-625 ft bls                          1.IDWR_Log(0-640ft).pdf
 - reverse-rotary mud log with temp and methane                2.Tooke_Log (640-3990).pdf
 - normal-drilling mud log with temp and % lithology           3.RMEC_Log (5420-7840).pdf
 (lithology of the missing strat. section, 3990-5420 ft bls, is described in daily drilling reports)



Lithology Summarized from Well Logs

Depth          Lithology               Comments
0 - 760        Basalt                  coarse sand, gravel 287-283 ft bls
768-895        Ash                     basalt @ 784-820
895-1270       Limestone               some shale, siltstone, minor sandstone
1270-2048      Shale                   some siltstone, shale contains gypsum
2048-2066      Basalt                  calcite-filled fractures
2066-2146      Shale/Siltstone
2146-2475      Basalt
2475-3990      Shale                   some ss, sltst, ls; six thin basalt dikes(?) @ 3590-3770
3990-5280      Shale/Limestone         missing logs; daily rept: “top of Dinwoody Fm” @ 5055
5280-5670      Shale                   decreasing limestone, increasing sandstone with depth
5670-6240      Sandstone/Shale         minor limestone
6240-7835      Limestone               with shale, ss; daily rept: “in the Wells Fm” @ 6271-7336
Summary of Lithologic Log and Thermal Characteristics
Temp. Data and Other Features (reconciled with Mike's and my notes from C. Austen)

Depth       Comments (all temperatures in oF)
0-625       temp = "cold"
625-1426    Tooke log: T = 47-50o with many small, rapid perturbations
1418-1425   daily rept @ 1418: Tout = 48o < Tin; @1425 Tout = 90o > Tin ( > 500 o/100 ft)
1426-1440   gap in log and change in mud-T scale, with Tout= 48o above and Tout= 68o below,
             abruptly rising to 75o over the next 10 ft (ca. 70 o/100 ft) and steady (! 5o)
             to top of the basalt @ 2150 (ca. 2 o/100 ft)
ca. 2000    C. Austen (pers. comm., 2009) indicated "gabbro" but only mention of it in the
             logs is @ 2160 near top of a basalt unit ("gabbro?" is indicated in Tooke Eng.
             log but described as "gen aphanitic; under scope micxln")
2150-2470   Tout increases across the basalt from 75o at top to 85o at base (ca. 3 o/100 ft)
2470-2860   . . . then gradually through the shale to 110 ! 10 o (ca. 6 o/100 ft)
2470-2490   methane log shows localized high at basalt/shale contact (background, otherwise)
2860-3990   Tout remains steady at 100 ! 5 o throughout the shale section, with no obvious
             changes across intercalated basalt flows (ca. 0 o/100 ft)
4000-4900   daily rept @ 4900: Tout= 112o = Tin (ca. 1 o/100 ft)
4000-5200   daily rept @ 4000: Tout= 102o > Tin @5200 Tsurvey(1 hr) = 109o (ca. 0.5 o/100 ft)
4000-5480   daily rept @ 5480: Tsurvey(1 hr) = 109o ( < 0.5 o/100 ft)
4000-6050   daily rept @ 6050: Tsurvey(.75 hr) = 112o (ca. 0 o/100 ft)
5620-5670   RMEC log: abrupt increase in mud T (ca. 16 o / 100 ft)
6050-6550   daily rept @ 6550: Tsurvey(2 hr) = 202o (ca. 180 o/100 ft) NOTE: in the Wells Fm.
6460-6490   RMEC log: abrupt increase in mud T (ca. 20 o / 100 ft)
6490-6525   RMEC log: abrupt decrease in mud T (ca. -20 o / 100 ft)
6550-6926   daily rept @ 6926: Tsurvey(2 hr) = 205o (ca. 1 o/100 ft)    NOTE: Tout = 107o > Tin = 98o
6926-7241   daily rept @ 7241: Tsurvey(2 hr) = 206o ( < 0.5 o/100 ft) NOTE: Tout = 107o > Tin = 98o
7241-7494   daily rept @ 7494: Tsurvey(2 hr) = 126o (ca. -30 o/100 ft) NOTE: Tout = 103o > Tin = 97o
7494-7776   daily rept @ 7776: Tsurvey(2 hr) = 125o ( < -0.5 o/100 ft) NOTE: Tout = 103o > Tin = 95o
7835 TD     11 days elapsed between hole collapse and reaming, when final T-log was run,
             daily rept @ 7835: Tlog-max = 156o (questionable data due to mixing in borehole)
Interpretation of temperature information:

The Tooke log shows a very sharp mud-temperature increase at ca. 1430 (no obvious lithologic
change), a zone of steadily increasing mud temperature between ca. 2100 and 2900 ft bls
(occurring across the only significant deep basalt unit), and fairly constant mud temperarures
from ca. 2900 to 3990 (end of log).

The RMEC log shows a steady increase (ca. 8oF) in mud-temperature difference between 5500
and 5700 ft bls ([Tout - Tin]/z ca. 4 o/100 ft), below which the mud-temperature difference is
either steady or shows localized cooling zones (such as at ca. 5800-6000 ft bls). The first abrupt
increase in mud temperature occurs at ca. 5650, followed by the first bottom-hole temperature
measurement below that depth of 112o* at 6050 ft bls. The abrupt change in mud-temperature
difference between 6460 and 6525 and the concomitant bottom-hole survey temperatures (202-
206o after 2 hours) and the rapidly decreasing survey temperatures below 7241 indicate that the
hottest zone in the hole is very localized (ca. 6460-6520 to ca. 6460-7240 ft bls), possibly only
50 ft to no more than 800 ft thick.

* only 45-minute equilibration time

								
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