siliciclasticsequence stratigraphy: application to ... · siliciclasticsequence stratigraphy:...
TRANSCRIPT
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Siliciclastic Sequence Stratigraphy:
Application to Explorationand ProductionJanok P. Bhattacharya
Robert Sheriff Professor of Sequence StratigraphyDepartment of Earth and Atmospheric Sciences
University of Houston4800 Calhoun Rd., Houston, Texas 77204-5007
Wk: 713/[email protected]
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Or…
Wheeler’s Confusionand the
Seismic Revolution: How Geophysics Saved
Stratigraphy
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Outline
• A Brief History of Sequence Stratigraphy• Lithostratigraphy in the 20th Century
– Failure• The Seismic Revolution• Applications using well logs and outcrops• Conclusion
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Outline
• A Brief History of Sequence Stratigraphy• Lithostratigraphy in the 20th Century
– Failure• The Seismic Revolution• Applications using well logs and outcrops• Conclusion
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Amadeus W. Grabau(1906)
• Showed onlap, offlap relationships in Paleozoic strata of North America.
• Illustrated time associated with a given unconformity.
Sequence Stratigraphy Time Stratigraphy
Grabau (1906)
e-f: onlap
a-d: offlap
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Offlap, facies versus time lines
• Grabau also showed diachronous relationships between facies and time in offlapping, regressive strata.
Grabau (1906)
Shazam Lines show diachroneity between facies
Sandstone Shale Limestome
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Diachronous facies boundaries cut across time lines.
Grabau - 1906
Van Wagoner et al., 1990 94 years later
Beds follow time lines.
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Eliott Blackwelder (1909)
• Recognized importance of unconformity-bounded strata across North American continent.
Rocks
Hiatus
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Larry Sloss (1963): Father of American Stratigraphy
• Applied Blackwelder’s work to North America (1963).
• Named six major sequences in North American Stratigraphy, representing major tectono-eustatic events.
• Sauk, Tippecanoe, Kaskaskia, Absaroka, Zuni, Tejas.
• Defined continent-wide unconformity-bounded units, which he termed sequences.
• Co-supervised graduate student Peter Vail at Northwestern University.
Hiatus
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Larry Sloss (1963): Father of American Stratigraphy
• Sloss was heavily influenced by Harry Wheeler (Washington University) who coined the term Sequence to describe an unconformity bounded unit.
Hiatus
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Harry Wheeler (1958)Inventor of Sequence Stratigraphy
• Wheeler depicted unconformity-bounded Sequences defined by arbitrary vertical cutoffs.
Time-Stratigraphy - Wheeler, 1958
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Wheeler Diagrams (1958)• Exploded cross
sections in Time.
• Wheeler insisted on arbitrary vertical cutoffs to define different sequences.
• No correlative conformities.
• Unwieldy scheme resulted in a proliferation of sequence names!
• Why did Wheeler adopt such a confusing approach?T
ime
Tim
eT
hic
knes
s
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Wheeler’s Concept of Lithofacies (1956)
Wheeler and Mallory, 1956
Concept of lithofacies represented a bulk, average property of several formations over a significant area, versus the environmental lithofacies concepts developed in the 60’s and 70’s. Lithofacies boundaries were vertical.
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Wheeler and Mallory, 1956
• Formations were defined by arbitrary vertical and horizontal boundaries.
• Nomenclature problems were acute where there was interfingering of lithofacies.
Wheeler’s Concept of Lithostratigraphy (1956)
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Use of Arbitrary Cutoffs in Lithostratigraphy in Clastic Wedges
Modified after Wheeler and Mallory, 1953
• Tongues (i.e. members) can be assigned either to Formation A or Formation B.
• Wheeler and Mallory were concerned that using the same name for each finger on a map would be misinterpreted as structural repetition.– Concepts were not developed with subsurface applications in mind.– Pre-environmental lithofacies
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Example of complex lithostratigraphicnomenclature using arbitrary vertical and horizontal cutoffs in the Book Cliffs.
• Interfingering units in the Book Cliffs, Utah.
• Note Buck Tongue shale is considered a member of the Price River Fm., not the Mancos Shale.
Wheeler and Mallory, 1953
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State-of-the-art Stratigraphy in 1953• Who would place orange boxes in different Formations?
• Which of these boundaries would produce a seismic reflection?
Wheeler and Mallory, 1953Flags or Reality?
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Harry Wheeler• Good:
– Wheeler (1958) formalized concept of time-stratigraphy
– Wheeler recognized that hiatuses are as important as the rocks.
– Wheeler depicted “exploded” stratigraphic cross sections with time on the vertical axis.
– Wheeler defined sequences as unconformity bounded units.
• Confusing:
– Wheeler’s sequences were defined by arbitrary vertical cutoffs.
– No correlative conformity.
– Vertical cutoffs also were key in defining lithostratigraphic units.• This may not be widely appreciated!
Special Note: Wheeler did not accept plate tectonics and was
likely derided by fellow academicians.
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Outline
• A Brief History of Sequence Stratigraphy• Lithostratigraphy in the 20th Century
– Failure• The Seismic Revolution• Applications using well logs and outcrops• Conclusion
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• “Stratigraphy is the complete triumph of terminology over facts and common sense.”• Paul D. Krynine, circa 1960
Failure of Stratigraphy in 1960
Slide courtesy of A.Embry
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Failure of Stratigraphy in 1960
Journal of
Sedimentary
Petrology
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Stratigraphy in mid-70’s• Stratigraphy was considered a largely dead field caricatured
by endless debates about what to name units.• Same lithologies with same-age fossils were placed in
different Formations because of arbitrary vertical cutoffs.• Sedimentologists became more focused on tectono-
petrographic studies or on environmental facies analysis.• Facies models replaced stratigraphy in the classroom.
– Wheeler’s science was ignored because he did not accept plate tectonic theory!
– There were many “enlightened” but more applied “oily”stratigraphers (Rich, 1951; Asquith, 1970,1974; Busch,1972; Forgoston, 1957; Frazier, 1974), but they seemed to have been rather ignored by the greater academic community as reflected in the textbooks of the time.
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State-of-the-art Stratigraphy in 1971 Using Environmental Lithofacies Concepts
Which of these arbitrary lithostratigraphic units will produce a
coherent reflection?
Martini, 1971Flags or Reality?
Facies correlation
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State-of-the-art Stratigraphy in 1981 Using Environmental Lithofacies Concepts
• Which of these
arbitrary
lithostratigraphic
units will produce
a coherent
reflection?
• Clearly facies
analysis isn’t
getting us where
we need to go!
Hobday et al., 1981
Flags or Reality?Facies correlation
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Stratigraphy or Flags in 2001?
• Representations of lateral transitions.
• No outcrop or seismic line even vaguely resembles these geometries!
• This is what the latest textbooks teach to undergraduates.
Boggs, 2001
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Outline
• A brief History of Sequence Stratigraphy• Lithostratigraphy in the mid-20th Century
– Failure• The Seismic Revolution• Applications using well logs and outcrops• Conclusion
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Seismic Stratigraphy• Seismic reflections assumed to image bedding
surfaces.• Stratal discontinuities identified by reflection
terminations (lapout).• “Depositional Sequences” bounded by
unconformities and their correlative conformities. – Typical resolution of about 10-100m.
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Chronostratigraphic Significance of Seismic Reflections
• Why would anyone assume or assert that seismic reflections are effectively “time lines”?– “Primary seismic reflections are generated by stratal
surfaces which are chronostratigraphic rather than by boundaries of arbitrarily defined lithostratigraphic units”Vail et al., 1977
• What does this mean?• The conclusion, that seismic reflectors are
chronostratigraphic horizons “is clearly untenable in a literal sense…”– Dickinson, 2003, The place and power of myth in
geoscience, Am. Jour. Sci. v. 303, p.856-864.
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These Stratigraphic Depictions Don’t Look Like Seismic Lines!
1956
1971
1981
What does the seismic image show that the geological cross sections fail to convey?
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Stacking Fundamentally Enhances the Signal to Noise Ratio and Allows Imaging of Bedding Contacts, Even
Where the Changes in Acoustic Properties Are Minimal.
All of these data = 1 trace (X) on a seismic line
• Coherent reflections (off bedding surfaces) constructively interfere.
• Incoherent reflections (lithofacies shazams) destructively interfere.
• The conclusion, that seismic reflectors are chronostratigraphic horizons “is clearly untenable in a literal sense…”
– Dickinson, 2003, The place and power of myth in geoscience, Am. Jour. Sci. v. 303, p.856-864.
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Seismic vs. Well Logs
Vail, 1987
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Facies vs. Seismic
• Lithostratigraphic facies boundaries are gradational and form “Shazam”-type, interfingering boundaries.
• Seismic reflections are interpreted to mark bed, bedset or parasequenceboundaries.
• Bed, bedset or parasequence boundaries are typically sharply defined surfaces across which there is a marked lithological change. Vail, 1987
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Lapout
• Termination of reflections termed lapout.• Used to separate apparently conformable sedimentary units.
Vail, 1987
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Incised Valleys
Seismic line of Quaternary Incised valley, Gulf of Mexico, Suter and Berryhill 1985
• Truncation of strata at valley floor and margins.• Onlap and downlap of strata within valley.
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Ferron Valleys - Outcrop Example
• Truncation of strata at valley floor and margins.
• Onlap and downlap of strata within valley.
Barton et al., 2004
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Accommodation Successions: Brazil
Neal J, Abreu V Geology 2009;37:779-782©2009 by Geological Society of America
PASS—PA sequence set; RSS—R sequence set; APSS—APD sequence set
Degradation
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Stratal stacking patterns associated with changing rates of coastal accommodation creation (δA) and sediment fill (δS): accommodation succession or clinoform trajectory
Neal J, Abreu V Geology 2009;37:779-782©2009 by Geological Society of America
Clinoform Trajectory & Accommodation Successions
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Accommodation Successions and Clinoform Trajectory
Neal J, Abreu V Geology 2009;37:779-782©2009 by Geological Society of America
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Slug Model
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Outline
• A brief History of Sequence Stratigraphy• Lithostratigraphy in the mid-20th Century
– Failure• The Seismic Revolution• Applications using well logs and outcrops• Conclusion
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Well Log Example: Dunvegan Formation, Alberta, Canada
A.G. Plint, 2000
Seismic stratigraphic concepts led to a re-evaluation of well-log stratigraphic approaches
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From J. Hammett, 2009, MS UH
Pseudoseismic Display: Using Well Logs
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Outcrop Correlation PanelYijie Zhu, 2010, UH PhD
2km
20m
Bentonites = Datum
B
A
A B
Cretaceous Ferron Notom Delta, Utah
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• 43 Parasequences, 18 Parasequence Sets, 6 Sequences• Well-developed parasequence stacking patterns define
systems tracts.
Ferron Sandstone Dip Sequence Stratigraphy
A
B
AB
Yijie Zhu, 2010, UH PhD
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• Evidence for 60 m drops of relative sea-level, assuming horizontal datum
• High frequency sequences, could be eustatic?
• Stacking Patterns
A - Aggradational, P - Progradational, D- Degradational, R - retrogradational
Yijie Zhu, PhD, 2010.
APD
RAPD
ARPR
APD
DAPR
PD
RP
RAP
PR
Shoreline Trajectory and Accommodation Successions: Ferron Notom Delta
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Wheeler Diagram Relative Sea Level
Yijie Zhu, 2010
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Outline
• A brief History of Sequence Stratigraphy• Lithostratigraphy in the mid-20th Century
– Failure• The Seismic Revolution• Applications using well logs and outcrops• Conclusion
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Conclusion:What Are Sequences Made Of?
Sloss, 1963
Van Wagoner et al., 1990Van Wagoner et al., 1990
The seismic approach led to a more detailed application of Sloss and Wheeler’s ideas to the stratigraphic record.
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• If an outcrop or well log cross section looks like a seismic line, it’s probably right!
Conclusion:
Seismic Stratigraphy,Modern Rhone shelf
Well Log Sequence Stratigraphy
Outcrop Lithostratigraphy
Tesson et al., 1993
Plint, 2000
Wheeler and Mallory, 1953
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Siliciclastic Sequence Stratigraphy:
Application to Explorationand ProductionJanok P. Bhattacharya
Robert Sheriff Professor of Sequence StratigraphyDepartment of Earth and Atmospheric Sciences
University of Houston4800 Calhoun Rd., Houston, Texas 77204-5007
Wk: 713/[email protected]