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The distinction between forced regression and normal regression is critical to ... Forced regression is driven by RSL fall and is associated with a regressive ... – PowerPoint PPT presentation

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Title: Contents


1
Contents
  • Introduction
  • Sedimentology concepts
  • Fluvial environments
  • Deltaic environments
  • Coastal environments
  • Offshore marine environments
  • Sea-level change
  • Sequence stratigraphy concepts
  • Marine sequence stratigraphy
  • Nonmarine sequence stratigraphy
  • Basin and reservoir modeling
  • Reflection

2
Marine sequence stratigraphy
  • The marine realm is considered here to include
    the shoreline, shelf, continental slope, and deep
    sea
  • The shoreline is perhaps the most sensitive
    component with respect to eustatic control it
    can migrate along dip over long distances
    (sometimes up to 100s of km) as a result of
  • RSL change
  • Variations in hinterland sediment supply
  • Autogenic processes (e.g., delta-lobe switching)

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4
Panorama
5
Marine sequence stratigraphy
  • Bruuns Rule predicts that a shoreface remains
    more or less constant during sea-level change
    (equilibrium profile), with associated erosion
    and deposition this 2D model is a tremendous
    simplification of reality
  • The distinction between forced regression and
    normal regression is critical to infer the
    relative roles of RSL change and sediment supply
  • Normal regression constitutes shoreface
    progradation due to excess sediment supply
  • Forced regression is driven by RSL fall and is
    associated with a regressive surface of erosion
    with shoreface strata sharply overlying
    fine-grained, offshore strata

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8
Marine sequence stratigraphy
  • Bruuns Rule predicts that a shoreface remains
    more or less constant during sea-level change
    (equilibrium profile), with associated erosion
    and deposition this 2D model is a tremendous
    simplification of reality
  • The distinction between forced regression and
    normal regression is critical to infer the
    relative roles of RSL change and sediment supply
  • Normal regression constitutes shoreface
    progradation due to excess sediment supply
  • Forced regression is driven by RSL fall and is
    associated with a regressive surface of erosion
    with shoreface strata sharply overlying
    fine-grained, offshore strata

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10
Marine sequence stratigraphy
  • Ravinement surfaces form during the landward
    migration of a shoreline due to transgression
  • Wave ravinement surfaces are widespread erosion
    surfaces formed by the stripping of a relatively
    thin deposit by wave action
  • Tidal ravinement surfaces are more localized, but
    commonly deeper erosive features associated with
    tidal channels
  • Shelf-edge deltas form during lowstand when RSL
    is close to the shelf break they have a fairly
    high preservation potential

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13
Marine sequence stratigraphy
  • Ravinement surfaces form during the landward
    migration of a shoreline due to transgression
  • Wave ravinement surfaces are widespread erosion
    surfaces formed by the stripping of a relatively
    thin deposit by wave action
  • Tidal ravinement surfaces are more localized, but
    commonly deeper erosive features associated with
    tidal channels
  • Shelf-edge deltas form during lowstand when RSL
    is close to the shelf break they have a fairly
    high preservation potential

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Marine sequence stratigraphy
  • Sedimentation in the deep sea is commonly
    believed to be strongly controlled by eustasy
  • RSL fall and lowstand brings the shoreline close
    to, or below the shelf break, and provides a
    mechanism for rapid transfer of sediment to the
    deep-sea floor RSL fall is associated with
    relatively coarse-grained (sandy) sediment
    gravity flows, whereas turbidites forming
    well-developed submarine fans follow during
    lowstand
  • Accommodation creation on the shelf during RSL
    rise and highstand reduces sediment supply to the
    slope and deep sea, and predominance of
    hemipelagic facies
  • Many exceptions are possible for instance, a
    limited shelf width and a high sediment supply
    from the hinterland can combine to allow rapid
    progradation of shorelines to the shelf edge even
    during highstand

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