Structural oil Traps

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    Structural oil Traps

    مُساهمة من طرف GeoMohamad في 2007-10-06, 3:50 pm

    There are three basic forms of a structural trap in petroleum geology

    Anticline Trap
    An anticline is an example of rocks which were previously flat, but have been bent into an arch. Oil that finds its way into a reservoir rock that has been bent into an arch will flow to the crest of the arch, and get stuck (provided, of course, that there is a trap rock above the arch to seal the oil in place)


    A cross section of the Earth showing typical Anticline Traps. Reseroir rock that isn't completely filled with oil also contains large amounts of salt water


    Fault Trap
    Fault traps are formed by movement of rock along a fault line. In some cases, the reservoir rock has moved opposite a layer of impermeable rock. The impermeable rock thus prevents the oil from escaping. In other cases, the fault itself can be a very effective trap. Clays within the fault zone are smeared as the layers of rock slip past one another. This is known as fault gouge

    A cross section of rock showing a fault trap - in this case, an example of gouge. This is because the reservoir rock on both sides of the fault would be connected, if not for the fault seperating the two. In this example, it is the fault itself that is trapping the oil


    Salt Dome Trap
    Salt is a peculiar substance. If you put enough heat and pressure on it, the salt will slowly flow, much like a glacier that slowly but continually moves downhill. Unike glaciers, salt which is buried kilometers below the surface of the Earth can move upward until it breaks through to the Earth's surface, where it is then dissolved by ground- and rain-water. To get all the way to the Earth's surface, salt has to push aside and break through many layers of rock in its path. This is what ultimately will create the oil trap

    Here we see salt that has moved up through the Earth, punching through and bending rock along the way. Oil can come to rest right up against the salt, which makes salt an effective trap rock. However, many times, the salt chemically changes the rocks next to it in such a way that oil will no longer seep into them. In a sense, it destroys the porosity of a reservoir rock


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    رد: Structural oil Traps

    مُساهمة من طرف geogibo في 2007-10-06, 4:15 pm

    Very Useful topic GeoMohamed
    I hope Tarek can view these structural oil traps and
    relate it to his topic on
    petroleum geology because he had a problem with the
    pics
    Thanks
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    mohammed radwan
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    رد: Structural oil Traps

    مُساهمة من طرف mohammed radwan في 2007-10-06, 4:49 pm

    nice topic ,thanks for u I love you
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    uno
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    رد: Structural oil Traps

    مُساهمة من طرف uno في 2007-10-09, 4:52 pm

    nice topic

    teslam ya 3'aly


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    رد: Structural oil Traps

    مُساهمة من طرف manchester في 2007-10-09, 8:53 pm

    thankes so much
    for your uesful information
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    marawan
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    رد: Structural oil Traps

    مُساهمة من طرف marawan في 2007-10-10, 12:43 pm

    very nice topic
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    رد: Structural oil Traps

    مُساهمة من طرف the knight mohsen في 2007-10-12, 7:34 am

    جميل الكلام

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