It is clear that the source (mother) rock and reservoirs or traps are formed by sedimentary rocks. The first due to the moment of the deposition and burying (the organisms are buried between sediments, commonly shale), the second due to the space which is in between the solid particles of the rock (porosity) that allow to migrate the oil to the top of this rocks.
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| Sandstone: EEUU |
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| Limestone: Antequera, Spain |
The natural sedimentation is made in horizontal way (just responding to gravitational law), in these two pictures is seen how after the sediments are converted in rocks, they have not suffered any tectonical movement, and keep its horizontal dip. However it is very usual that the rocks lose its horizontal structure as a result of tectonical strengths.
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