west keystone south clear fork field, winkler …
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Tubb
Low
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For
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LOWER CLEAR FORK - WICHITA FACIES AND STRATIGRAPHYKEYSTONE SOUTH CLEAR FORK FIELD, WINKLER COUNTY, TEXASWEST EAST
A A’W
ichi
ta s
eque
nce
W1
Wic
hita
UpperWAporosity(CC)
W1
UpperWA
porosity(CC)
Wic
hita
seq
uenc
e W
2
B/LCF(CC)
W2
LCF
sequ
ence
L2.
1
Low
er C
lear
For
k
T/Main CFporosity
(CC)
LCF
sequ
ence
L2.
2LC
F se
quen
ce L
2.3
Tubb S
sequ
ence
L3
LCF
sequ
ence
L2.
1LC
F se
quen
ce L
2.2
W2
LCF
sequ
ence
L2.
3
W1
STRATIGRAPHY AND FACIES OVERVIEWLOWER CLEAR FORK
EXPLANATIONLower Clear Fork/Tubb Systems Tracts
TST: shallow water silty peritidal; low permeability
TST-early HST: subtidal; more discontinuous porous and permeable facies
Late HST: tidal flat-capped subtidal; most porosityin low permeabilty, continuous cycle tops
Ooid/peloid grain-dominated packstone
Peloid packstone
5
Peloid wackestone-packstoneSkeletal wackestone
Fusulinid/peloid packstone7 Fusulinid wackestone
Mudstone
Siltstone/sandstone6
Tidal flat1
No core
2
8
4
3
9
Oncolite packstone
Polymict cave fill conglomerateLithoclast breccia
Peloid grain-dominated packstone
Roof crackle breccia
Core Facies
WICHITA
The Lower Clear Fork comprises three high frequency sequences (HFS) thatare part of a major composite (3rd-order) sequence. Each HFS is composed of alower transgressive leg (TST) and an upper highstand leg (HST). TSTs arecharacterized by dominantly subtidal cycles that contain facies that display goodporosity and permeability but limited lateral continuity. HSTs are characterized bytidal flat-capped subtidal cycles. The porosity in these cycles is concentrated in thetidal flat caps which, although continuous, generally have low permeability.
Regionally, the Wichita facies comprises mud-dominated, restricted peritidalto tidal flat deposits that are locally karsted. Cores from Keystone South are generallyconsistent with this interpretation although they indicate less restricted conditions(more subtidal) than at Fullerton field for example. Based on cores, neither faciesor cycles exhibit much lateral continuity. Wichita porosity and permeability appearto be controlled by mineralogy as much as by facies. Although not marked by afacies change, the change in mineralogy from dolostone to limestone at the W1marker may correspond to a major sequence boundary that has been defined fromregional outcrop and subsurface studies.
Exposed cycle topSubtidal cycle topCorrelation marker
Correlations
Wichita Systems TractsTST-HST: restricted shallow subtidal to peritidal; porousand locally permeable; facies continuity poor.
By S. C. Ruppel, 2006
6900
6950
6900'
70007000'
Keystone Cattle Co. # 422
71007100'
6950'
71507150'
70507050'
0.1
6100
6150
6200
6250
6300
6350
6400
6450
6500
6550
6600
6650
6700
6750.0
Keystone # 431
CGRGAPI0 150
GR_ND_1GAPI0 150
DEPTHFEET
RHOB_1G/CC2 3
NPHI_1V/V0.3 -0.1
DTUS/F70 40
PEF_1B/E0 10
6050
6100
6150
6200
6250
6300
6350
6400
6450
6500
6550
6600
6650
6700
6750
6800
6850
6900
6950
7000
7050
7100
7150
7200
7250
7300
7350
7400
7450
7500.0
Keystone # 415
CGRGAPI0 150
GR_ND_1GAPI0 150
DEPTHFEET
RHOB_1G/CC2 3
NPHI_1V/V0.3 -0.1
DT_1US/F70 40
PEF_1B/E0 10
CGRGAPI0 150
GR_1GAPI0 150
6250
6300
6350
6400
6450
6500
6550
6600
6650
6700
6750
6800
6850
6900
6950
7000
7050
7100
7150
7200
7250
7300
7350
7400
6200.0
DEPTHFEET
RHOB_1G/CC2 3
NPHI_1V/V0.3 -0.1
PEF_1B/E0 10
Keystone # 406
6050
6100
6150
6200
6250
6300
6350
6400
6450
6500
6550
6600
6650
6700
6750
6800
6850
6900
6950
7000
7050
7100
7150
7200
7250
7300
7350
7400
7450
CGRGAPI0 150
GR_ND_1GAPI0 150
5500.0
DEPTHFEET
RHOB_1G/CC2 3
NPHI_1V/V0.3 -0.1
PEF_1B/E0
Keystone # 416
6150
6200
6250
6300
6350
6400
6450
6500
6550
6600
6650
6700
6750
6800
6850
6900
6950
7000
7050
7100
7150
7200
7250
7300
7350
7400.0
CGRGAPI0 150
GR_1GAPI0 150
6000.0
DEPTHFEET
RHOB_1G/CC2 3
NPHI_1V/V0.3 -0.1
US/F
PHI_1V/V0.3 -0.1
PEF_1B/E0 10
Keystone # 409
Keystone Cattle Co. # 409
7000'
7050''
7100'
CGR
GAPI0 150
GR_RES_SHFT_4GAPI0 150 DEPTH
FEET RHOB_SHFT_1
G/CC2 3
NPHI_SHFT_1V/V0.3 -0.1
PEF_1
B/E0 10
Keystone # 422
6100
6150
6200
6250
6300
6350
6400
6450
6500
6550
6600
6650
6700
6750
6800
6850
6900
6950
7000
7050
7100
7150
7200
7250
7300
7350
7400
7450
7500
CGRGAPI0 150
GR_1GAPI0 150
6050
6100
6150
6200
6250
6300
6350
6400
6450
6500
6550
6600
6650
6700
6750
6800
6850
6900
6950
7000
7050
7100
7150
7200
7250
7300
7350
6000.0
7400.0
DEPTHFEET
RHO8_1G/CC2 3
NPHI_1V/V0.3 -0.1
PHI_1V/V0.3 -0.1
PEFZ_1B/E0 10
6430
6440
6450
6460
6470
6480
6490
6500
6510
6520
6530
6540
Keystone # 437
0.1110
Keystone Cattle Co. # 437
6400'
6450'
6500'
6550
CGRGAPI0 150
GR_1GAPI0 150
6050
6100
6150
6200
6250
6300
6350
6400
6450
6500
6550
6600
6650
6700
6750
6800
6850
6900
6950
7000
7050
7100
7150
7200
7250
7300
7350
6000.0
7400.0
DEPTHFEET
RHOZ_1G/CC2 3
NPHI_1V/V0.3 -0.1
PHI_1V/V0.3 -0.1
PEFZ_1B/E0 10
Keystone # 438
Keystone Cattle Co. # 438
6800'
6850'
6900'
6950'
KETCHUM MT.
DOVE CREEK
PAROCHIAL-BADE
HOWARD-GLASSCOCK
VAREL
REVILO
LUCY
DIAMOND -M-
SHARON RIDGE
COLEMAN RANCH, N.
COLEMANRANCH
WESTBROOK, EAST
MIRIAM
P.H.D.
ROCKER -A-
GUINN
POST
WTG
SMYER
ROPES, E.
HARRISFLANAGAN
ROBERTSON, N.RILEY, NORTH
RUSSELL
WASSON 72
OWNBY
PRENTICE
KINGDOM
SUNDOWN LEEPER
WARHORSE
BROWNLOVINGTON
MIDWAYDOUBLE A, SOUTHDOUBLE A
EMPIRE
BUCKEYEVACUUMCORBIN
HAL JAMAR
LEVELLAND
ANTON
ANTON-IRISH
RIDGE
HOOPLE
EDMISSON
KEYSTONE
KEYSTONE, SOUTH
EMPORER
MONAHANS, N.
DOLLARHIDEJUSTIS
FOWLER
TEAGUE
DRINKARD
OIL CENTER
METZ
PENWELL
C-BARMONAHANS
CRAWAR
SAND HILLS
MCKEE
BAYVIEW
SUN VALLEY, N.BROOKLAW
SUN VALLEY
BROWN & THORP
WENTZTIPPETT
BROWN & THORP,EAST
ROBERDEAU, S.
UNION
FULLERTON
SHAFTER LAKE
DEEP ROCK
FUHRMAN SOUTH
NIX, SOUTH
BLOCK 12
MARTIN
TXL
MONUMENT BLOCK A-34
HOBBS
WELTMER
WEIR
SCAGGSHOUSE
BRUMLEYWARREN
PADDOCK
GOLDSMITH
GOLDSMITH, W.
TURNER-GREGORY
EMBAR
JACKSON
DELAWAREBASIN
CENTRALBASIN
PLATFORM
0 25 50 miles
CROSBY
DICKENS
KENT
SCURRY
LYNN
DAWSONGAINES
MITCHELL
GLASSCOCK
ANDREWS
MIDLAND
TOM GREENSTERLING
UPTON
ECTOR
TERRY
BORDEN
GARZA
MARTIN
HALE
LUBBOCKHOCKLEY
LAMB
CHAVES
EDDY
LOVING
REAGAN
CRANE
PECOS
WINKLER
REEVES
COCHRAN
YOAKUM
WARD
IRION
EASTERN SHELF PERMIAN CARBONATE
LEONARDIAN PLATFORM CARBONATE
NORTHERN SHELF PERMIAN CARBONATE
LEA
EA STERN
SHELF
HOWARD
NORTHERN SHELF
MIDLANDBASIN
BLINEBRY
KeystoneSouth
Middle Permian Paleogeography and Leonardian Fields
Lower Clear Fork Structure: Keystone South Field
14
13
12
11
10
9
8
7
4
3
2
127
28
29 30
BLK. B2
A
A'
-3700
-3700
-3700
-3700
-3800
-3800
-3800
-3600
-3700
29
301
CT30
300
259
237
425
255
203
414
439
431251
258
435
125E
138T
432
415440
413
155
441
186
406
147T
416
181
256
412
153
411
234 407
403
149
206
408
183
429
404 427
142T
141T
436150
405
200430
418
252145T
428
156
379 1236
417
151
420
158
2571
220
254
410
188
54419
152
235
298
1
253
102157
303
304
422 437
438
409
B
B’
N
Core
Explanation
50000 ft
Line of sectionA A’
Map supplied by David McMahon
Winkler County, TexasKeystone South Field
Wichita-Albany Structure
(Courtesy of Crownquest)
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