spraberry and dean sandstones (lower permian, leonardian), midland basin, west texas -

E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX

SPRABERRY AND DEAN SANDSTONESSPRABERRY AND DEAN SANDSTONES(LOWER PERMIAN, LEONARDIAN), (LOWER PERMIAN, LEONARDIAN),

MIDLAND BASIN, WEST TEXAS -MIDLAND BASIN, WEST TEXAS -

MATURE PETROLEUM RESERVOIRS,MATURE PETROLEUM RESERVOIRS,SIGNIFICANT REMAINING RESOURCESSIGNIFICANT REMAINING RESOURCES

PBGSP

Bureau of Economic GeologyThe University of Texas at Austin

Edgar H. GuevaraEdgar H. Guevara


THE SPRABERRY AND DEAN FOMATIONSTHE SPRABERRY AND DEAN FOMATIONS

• have been interpreted as low-stand, have been interpreted as low-stand, submarine-fan deposits, e.g., Handford submarine-fan deposits, e.g., Handford (1981); Sarg (1989); Tyler and others (1997)(1981); Sarg (1989); Tyler and others (1997)

• record terrigenous clastics transportrecord terrigenous clastics transport into the Midland Basin in the Early Permianinto the Midland Basin in the Early Permian

• include hydrocarbon reservoirs thatinclude hydrocarbon reservoirs that collectively contain >10 billion bbl OOIPcollectively contain >10 billion bbl OOIP


SPRABERRY AND DEAN RESERVOIRSSPRABERRY AND DEAN RESERVOIRS

• Naturally fractured siltstones and sandstonesNaturally fractured siltstones and sandstones

• Low matrix porosity (<10%) locally enhancedLow matrix porosity (<10%) locally enhanced by mineral dissolution or reduced byby mineral dissolution or reduced by quartz and carbonate cementquartz and carbonate cement

• <1 md matrix permeability<1 md matrix permeability

• >1 darcy fracture permeability>1 darcy fracture permeability


SPRABERRY AND DEAN RESERVOIRSSPRABERRY AND DEAN RESERVOIRS

• Low recovery (<10%)Low recovery (<10%)

• Short-lived wells are common, but some Short-lived wells are common, but some wells in waterflood areas have long wells in waterflood areas have long production historyproduction history

• Under-pressuredUnder-pressured

• Collectively contain >10 billion bbl OOIPCollectively contain >10 billion bbl OOIP

E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TXFrom Tyler and others (1997)

SPRABERRY AND SPRABERRY AND DEAN FORMATIONS DEAN FORMATIONS (LOWER PERMIAN,(LOWER PERMIAN,LEONARDIAN),LEONARDIAN),MIDLAND BASINMIDLAND BASIN

GEOLOGIC SETTING GEOLOGIC SETTING AND REPRESENTATIVEAND REPRESENTATIVEOIL FIELDSOIL FIELDS


STRATIGRAPHIC COLUMN - CENTRAL SPRABERRY TREND

From Tyler and others (1997)


TUBB / DEAN / LOWER SPRABERRY STRATIGRAPHIC RELATIONSHIPS

BureauofEconomic

Geology

QAd4871x E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TX


SPRABERRY AND DEAN DEPOSITIONAL SEQUENCES

MIDLAND BASIN, WEST TEXAS



DEPOSITIONAL

SETTING


SPRABERRY FORMATIONSPRABERRY FORMATION OPERATIONAL UNITSOPERATIONAL UNITS


A B

1

1’

1’

W-E CROSS SECTIONW-E CROSS SECTIONSPRABERRY ANDSPRABERRY ANDDEAN FORMATIONSDEAN FORMATIONS


AWest East

BCENTRAL SPRABERRY TREND




SAND SAND DISTRIBUTIONDISTRIBUTION


SPRABERRY FORMATIONSPRABERRY FORMATION

SAND DISPERSAL PATTERNSSAND DISPERSAL PATTERNS



UNUNITIZEDAREA

CENTRAL SPRABERRY TREND

A A’

A A’ cross section lineCentral Spreberry Trend


CENTRAL SPRABERRY TRENDUNUNITIZED AREA


UPPER SPRABERRYUPPER SPRABERRYOPERATIONAL UNIT IucOPERATIONAL UNIT Iuc

NET SANDSTONENET SANDSTONEAND SILTSTONEAND SILTSTONE


Photograph, boxed, slabbed core

R

S

T

U

R Sandstone bed in Sohio Petroleum Co. reports

EXPLANATION


SUN, JALONICK 2 SUN, JALONICK 2 CORE FACIESCORE FACIES


SUN, JALONICK 2SUN, JALONICK 2CORE FACIESCORE FACIES


DEAN DEAN STRUCTURESTRUCTURE

BureauofEconomic

Geology

-5,000

-6500

-6000

-4000

MIDLAND BASINMIDLAND BASIN


DEAN FM.DEAN FM.OPERATIONAL OPERATIONAL

UNITSUNITS

BureauofEconomic

Geology


DEAN FM.DEAN FM.CROSS SECTIONSCROSS SECTIONS

12

3 4 5 67

89

12 34 5 6

78

9 10

BureauofEconomic

Geology

W

E

E Guevara, Bureau of Economic Geology, PBGSP Annual Meeting, 2/27-28/06, Austin, TXBureau

ofEconomic

Geology

2 31 4 5

W

8 9 106 7E'

DEAN FM. - NORTHERN MIDLAND BASINDEAN FM. - NORTHERN MIDLAND BASIN


DEAN FM.DEAN FM.NET SANDNET SAND

UNIT 4UNIT 4

BureauofEconomic

Geology

20

MIDLAND BASINMIDLAND BASIN


CENTRALCENTRALSPRABERRY SPRABERRY

TREND TREND

DEAN FM.DEAN FM.CROSS SECTIONSCROSS SECTIONS

12 3 4 5 6 7

8 910

11 1213

REAGAN COGLASSCOCK CO

UPTON COMIDLAND CO

BureauofEconomic

Geology


DEAN FM. – CENTRAL SPRABERRY TRENDDEAN FM. – CENTRAL SPRABERRY TREND

BureauofEconomic

Geology

2 31 4 5 6 7

2 31 4 5 6


SPRABERRY SPRABERRY TRENDTREND

DEAN FM.DEAN FM.NET SANDNET SAND

UNIT 4UNIT 4

BureauofEconomic

Geology

REAGAN CO

GLASSCOCK COMIDLAND CO

UPTON CO

15

15

15

25


DEAN CORE FACIESDEAN CORE FACIES

ACKERLY-DEANACKERLY-DEANWATERFLOOD UNITWATERFLOOD UNITN. MIDLAND BASINN. MIDLAND BASIN

spraberry and dean sandstones (lower permian, leonardian), midland basin, west texas -

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