Transcript Slide 1

SPRABERRY AND DEAN SANDSTONES
(LOWER PERMIAN, LEONARDIAN),
MIDLAND BASIN, WEST TEXAS MATURE PETROLEUM RESERVOIRS,
SIGNIFICANT REMAINING RESOURCES
PBGSP
Edgar H. Guevara
Bureau of Economic Geology
The University of Texas at Austin
E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
THE SPRABERRY AND DEAN FOMATIONS
• have been interpreted as low-stand,
submarine-fan deposits, e.g., Handford
(1981); Sarg (1989); Tyler and others (1997)
• record terrigenous clastics transport
into the Midland Basin in the Early Permian
• include hydrocarbon reservoirs that
collectively contain >10 billion bbl OOIP
E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
SPRABERRY AND DEAN RESERVOIRS
• Naturally fractured siltstones and sandstones
• Low matrix porosity (<10%) locally enhanced
by mineral dissolution or reduced by
quartz and carbonate cement
• <1 md matrix permeability
• >1 darcy fracture permeability
E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
SPRABERRY AND DEAN RESERVOIRS
• Low recovery (<10%)
• Short-lived wells are common, but some
wells in waterflood areas have long
production history
• Under-pressured
• Collectively contain >10 billion bbl OOIP
E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
SPRABERRY AND
DEAN FORMATIONS
(LOWER PERMIAN,
LEONARDIAN),
MIDLAND BASIN
GEOLOGIC SETTING
AND REPRESENTATIVE
OIL FIELDS
E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
From Tyler and others (1997)
STRATIGRAPHIC COLUMN - CENTRAL SPRABERRY TREND
From Tyler and others (1997)
E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
TUBB / DEAN / LOWER SPRABERRY
STRATIGRAPHIC RELATIONSHIPS
E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
Bureau
of
Economic
Geology
QAd4871x
SPRABERRY AND DEAN
DEPOSITIONAL SEQUENCES
MIDLAND BASIN, WEST TEXAS
E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
DEPOSITIONAL
SETTING
E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
SPRABERRY FORMATION
OPERATIONAL UNITS
E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
1
A
W-E CROSS SECTION
SPRABERRY AND
DEAN FORMATIONS
B
1 1
E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
West
A
East
B
CENTRAL SPRABERRY TREND
From Tyler and others (1997)
E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
SAND
DISTRIBUTION
From Tyler and others (1997)
E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
SPRABERRY FORMATION
SAND DISPERSAL PATTERNS
From Tyler and others (1997)
E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
CENTRAL SPRABERRY TREND
UNUNITIZED
AREA
A
A’
Central Spreberry Trend
A
A’ cross section line
E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
CENTRAL SPRABERRY TREND
UNUNITIZED AREA
E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
UPPER SPRABERRY
OPERATIONAL UNIT Iuc
NET SANDSTONE
AND SILTSTONE
E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
R
S
T
U
EXPLANATION
R
Sandstone bed in
Sohio Petroleum Co. reports
Photograph, boxed,
slabbed core
E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
SUN, JALONICK 2
CORE FACIES
E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
SUN, JALONICK 2
CORE FACIES
E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
DEAN
STRUCTURE
MIDLAND BASIN
E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
Bureau
of
Economic
Geology
DEAN FM.
OPERATIONAL
UNITS
E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
Bureau
of
Economic
Geology
DEAN FM.
CROSS SECTIONS
W
1
2 34
5
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E
8
9
10
9
8
1
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4 5
7
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E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
Bureau
of
Economic
Geology
DEAN FM. - NORTHERN MIDLAND BASIN
W
1
2
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E'
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Bureau
of
Economic
Geology
DEAN FM.
NET SAND
UNIT 4
MIDLAND BASIN
E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
Bureau
of
Economic
Geology
CENTRAL
SPRABERRY
TREND
DEAN FM.
CROSS SECTIONS
1
2 3
4
5
6
10
7
8
MIDLAND CO
UPTON CO
9
13
11 12
GLASSCOCK CO
REAGAN CO
E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
Bureau
of
Economic
Geology
DEAN FM. – CENTRAL SPRABERRY TREND
1
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E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
Bureau
of
Economic
Geology
SPRABERRY
TREND
DEAN FM.
NET SAND
UNIT 4
MIDLAND CO
GLASSCOCK CO
UPTON CO
REAGAN CO
E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
Bureau
of
Economic
Geology
DEAN CORE FACIES
ACKERLY-DEAN
WATERFLOOD UNIT
N. MIDLAND BASIN
E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX
DEAN CORE FACIES
ACKERLY-DEAN
WATERFLOOD UNIT
N. MIDLAND BASIN
E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX