Lecture 1 Sedimentary Rocks

Lecture 1 Sedimentary Rocks - Wednesday, January 20, 2009...

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Wednesday, January 20, 2009
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Sedimentary Rocks All petroleum source rocks are sedimentary. In addition sedimentary rocks provide reservoirs and can and do act as reservoir seals. Although they comprise only 8% of the volume of of the earth’s crust, sedimentary rocks cover 75% of the land surface.
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Sedimentary Rock Sandstone ( Consolidated Sand ) About one fourth of all sedimentary rock is sandstone. Sandstone's are of particular interest to petroleum geologists because they are typically more permeable to formation fluids than other rocks and therefore able to accumulate oil and gas.
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Sedimentary Rock Shale One half to three fourths of the world’s sedimentary rock is estimated to be shale. Formed of fine clay and silt sediments that settle out of suspension in still waters, shale occurs in thick deposits over broad areas often interbedded with siltstone, sandstone, or limestone. Shale usually becomes a barrier to oil or gas migration.
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Sedimentary Rock Carbonates Limestone and dolomites
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Lecture 1 Sedimentary Rocks - Wednesday, January 20, 2009...

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