GEOSCIENCE

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    short notes about seismic stratigraphy

    uno
    uno
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    تاريخ التسجيل : 15/06/2007

    short notes about seismic stratigraphy Empty short notes about seismic stratigraphy

    مُساهمة من طرف uno 2007-10-10, 12:30 am

    seismic stratigraphy
    A wide variety of data can be integrated in stratigraphic and basin studies.
    some kinds we have met already in this section including:
    1- lithological
    2- sedimentological
    3- paleontological
    short notes about seismic stratigraphy 1
    this kind of information may be obtained either from surface exposures and outcrops,
    or from the subsurface via well logs and cores
    another important source of information otfen used in stratigraphic and
    basin studies is SEISMIC data
    short notes about seismic stratigraphy 2
    seismic surveys provide information about the geology that lies beneath the Earth's surface.
    This is achieved by sending seismic waves into the subsurface and recording
    the reflected or refracted energy that returns to the surface.
    A reflection is produced where a seismic wave encounters an interface that reflects part of the wave's energy back to the surface.
    Notice that, for seismic data, the vertical scale is measured in time
    , not in depth. Two-way time (TWT) is the time for a seismic wave to
    travel down to a reflector and back to the surface.
    short notes about seismic stratigraphy 3
    The extent which a surface reflects seismic energy is a function of
    quantity called ACOUSTIC IMPEADANCE
    short notes about seismic stratigraphy 4
    .... or to be more precise, it depends on the CONTRAST in acoustic impeadance across the surface
    little or no contrast in acoustic impeadance
    short notes about seismic stratigraphy 5
    marked contrast in acoustic impeadance:REFLECTION
    short notes about seismic stratigraphy 6
    The seismic line opposite shows strong reflectors, indicating high acoustic
    impeadance contrast. as well as more opaque areas that suggest low contrast
    short notes about seismic stratigraphy 7
    it is believed that seismic reflectors approximate to time lines
    i.e.
    A sharp facies change across a bedding plane is likely to be associated with a sharp impeadance contrast, leading to reflection of seismic waves
    short notes about seismic stratigraphy 8
    in effect, reflection are only generated from stratigraphic surfaces (e.g. bedding contacts) across which there is a contrast in acoustic impeadance.
    In stratigraphic studies, seismic is particularly useful for illustrating large scale stratal geometries.
    In addition, changes in the character or reflections can be used to provide information about lateral variability in lithology and/or depositional process.
    short notes about seismic stratigraphy 9

    mohammed radwan
    mohammed radwan
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    مُساهمة من طرف mohammed radwan 2007-10-10, 12:58 am

    thanks for the topic , is excellent special this sharp faces,if u have more about it tell please
    uno
    uno
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    ذكر عدد الرسائل : 217
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    Emploi : geochemistry student
    university : Alexandria
    تاريخ التسجيل : 15/06/2007

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    مُساهمة من طرف uno 2007-10-10, 1:24 am

    ha7awel ya georadwan ageeb more info. 3n l lateral variability
    in lithology in sesimic lines
    pirat
    era11
    era11
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    عدد الرسائل : 45
    تاريخ التسجيل : 12/09/2007

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    مُساهمة من طرف era11 2007-10-27, 3:45 am

    thnx alot uno

      الوقت/التاريخ الآن هو 2024-11-01, 2:52 am