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

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

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

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

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

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

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

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

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

BureauofEconomic

Geology

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

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

SPRABERRY AND DEAN DEPOSITIONAL SEQUENCES

MIDLAND BASIN, WEST TEXAS

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

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 FORMATIONSPRABERRY FORMATION OPERATIONAL UNITSOPERATIONAL UNITS

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

A B

1

1’

1’

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

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

AWest East

BCENTRAL SPRABERRY TREND

From Tyler and others (1997)

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

From Tyler and others (1997)

SAND SAND DISTRIBUTIONDISTRIBUTION

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

SPRABERRY FORMATIONSPRABERRY FORMATION

SAND DISPERSAL PATTERNSSAND DISPERSAL PATTERNS

From Tyler and others (1997)

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

UNUNITIZEDAREA

CENTRAL SPRABERRY TREND

A A’

A A’ cross section lineCentral Spreberry Trend

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

CENTRAL SPRABERRY TRENDUNUNITIZED AREA

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

UPPER SPRABERRYUPPER SPRABERRYOPERATIONAL UNIT IucOPERATIONAL UNIT Iuc

NET SANDSTONENET SANDSTONEAND SILTSTONEAND SILTSTONE

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

Photograph, boxed, slabbed core

R

S

T

U

R Sandstone bed in Sohio Petroleum Co. reports

EXPLANATION

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

SUN, JALONICK 2 SUN, JALONICK 2 CORE FACIESCORE FACIES

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

SUN, JALONICK 2SUN, JALONICK 2CORE FACIESCORE FACIES

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

DEAN DEAN STRUCTURESTRUCTURE

BureauofEconomic

Geology

-5,000

-6500

-6000

-4000

MIDLAND BASINMIDLAND BASIN

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

DEAN FM.DEAN FM.OPERATIONAL OPERATIONAL

UNITSUNITS

BureauofEconomic

Geology

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

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

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

DEAN FM.DEAN FM.NET SANDNET SAND

UNIT 4UNIT 4

BureauofEconomic

Geology

20

MIDLAND BASINMIDLAND BASIN

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

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

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

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

BureauofEconomic

Geology

2 31 4 5 6 7

2 31 4 5 6

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

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

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

DEAN CORE FACIESDEAN CORE FACIES

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

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

DEAN CORE FACIESDEAN CORE FACIES

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