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Sequence Stratigraphy of the South Texas Oligocene: Understanding the Relationship Between Shale Tectonism and Lowstand Deposition. R. Treviño, L.F. Brown, R. Loucks, and U. Hammes Bureau of Economic Geology Jackson School of Geosciences The University of Texas at Austin.

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Sequence Stratigraphy of the South Texas Oligocene: Understanding the

Relationship Between Shale Tectonism

and Lowstand Deposition

R. Treviño, L.F. Brown, R. Loucks, and U. Hammes

Bureau of Economic Geology

Jackson School of Geosciences

The University of Texas at Austin


A new depositional model for the frio vicksburg
A New Depositional Model for Understanding the the Frio / Vicksburg


Overview Understanding the

  • Location

  • South Texas Growth-Faulted Subbasins

  • Stratigraphy – Structure Interplay

  • Dynamic Model

  • Exploration Potential


Location Map Understanding the



Schematic representation - successive growth-faulted intraslope subbasins

Organization

Repetition


Organization of sands intraslope subbasins

(after Mitchum and Van Wagoner, 1991)


Origin of Growth-Faulted Subbasins intraslope subbasins

Related to the interaction of:

- gravity tectonics,

- relative sea-level changes,

- and sediment supply.

Feedback


Wireline-log sequence stratigraphy intraslope subbasins

Basin-floor fans


Wireline-log sequence stratigraphy intraslope subbasins

Slope fans


Wireline-log sequence stratigraphy intraslope subbasins

Lowstand prograding wedge


Wireline-log sequence stratigraphy intraslope subbasins

Lowstand prograding wedge


Organization of sands intraslope subbasins


Early Lowstand Systems Tract intraslope subbasins

Incised valleys commonly

erode at fault intersections

Lowstand systems tract

Incised-valleys

Slope

upper - lower

LST Prograding Wedges

Pelagic deposition

~20 to 40 miles

Depositional systems after Galloway et al., 1982



Dynamic depositional model
Dynamic Depositional Model intraslope subbasins


Conclusions intraslope subbasins

  • Offshelf Lowstands overload slope

  • Growth-faulted subbasins younger basinward

  • Similar log facies, different subbasins = different time

  • Deep Potential


Acknowledgements

Western Geco – Seismic intraslope subbasins

Sabco

IBC (now Boss Exploration)

Acknowledgements


STARR PROGRAM intraslope subbasins

State of Texas

Advanced Resource Recovery


Organization of sands intraslope subbasins

(after Mitchum, 1991)


A intraslope subbasins

n

a

h

u

a

c

H

S

T

Organization: Seismic view


Organization intraslope subbasins

Schematic representation of successive growth-faulted intraslope subbasins


Regional dip cross section using S intraslope subbasins5 logs

Paleo control


Isochron map of lowstand prograding wedges intraslope subbasins

Sediment input (incised valleys) axes


Incised valley feeder systems intraslope subbasins

Isopach map of lowstand prograding wedges




Wireline-log sequence stratigraphy intraslope subbasins

Lowstand incised-valley fill, transgressive, and highstand systems tracts


Wireline-log sequence stratigraphy intraslope subbasins

Lowstand incised-valley fill, transgressive, and highstand systems tracts


Red Fish Bay intraslope subbasins

S5-Benchmark Chart


Section of Red Fish Bay S intraslope subbasins5-Benchmark Charts


Regional correlations of sands intraslope subbasins

So, how do you correlate between subbasins?


Regional dip cross section using S intraslope subbasins5 logs


Site-Specific Sequence-Stratigraphic Section Benchmark Charts (S5 Benchmark Charts)

  • Composite logs with

    • Sequence stratigraphy

    • additional data

    • summarize subbasin geology

  • Promote accurate correlations


Shelf edge Charts (S

+/-1000ft

~3000-4000ft

Stage in development and filling of growth-faulted intraslope subbasins: Stage 1


Turbidity flow Charts (S

Stage in development and filling of growth-faulted intraslope subbasins: Stage 2


Turbidity flow Charts (S

Stage in development and filling of growth-faulted intraslope subbasins: Stage 3


Turbidity flow Charts (S

Mobilized basinal shales forming incipient shale ridge

Stage in development and filling of growth-faulted intraslope subbasins: Stage 4


Incised valleys Charts (S

Termination of slope fan deposition

Stage in development and filling of growth-faulted intraslope subbasins: Stage 5


ivf Charts (S

Stage in development and filling of growth-faulted intraslope subbasins: Stage 6








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