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WHAT NO ONE TELLS YOU ABOUT SEQUENCE STRATIGRAPHY

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A strong rooted paradigm in the geological culture is that related to the falling of the base level with the generation of regressive deposits in the basin. Although intuitively this may seem correct, just analyze the relationship between the accommodation space and the sedimentation rate allows to notice that something goes wrong. For pragmatical purposes we will consider that the sedimentation rate is constant. Under this condition, also is added that when there is a relative rise of the base level, the product will be an increase in the accommodation space. This is the key to understanding not only the mechanics of sequence stratigraphy analysis, but also that eustatic rise generate the greatest sediment accumulation in the basin. If we analyze at a certain point the evolution of the sedimentary package, different stacking patterns will ocurrs depending on the rate of relative rise of the base level. Thus, under a constant sedimentary supply, it can produce a progr...
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What is the average size of a perforation? What is the average size of a cell in a static model? If we could be the size of the sun, would we be able to see an ant with naked eye? If we were the size of an atom could we watch television? All these questions have a common denominator, the scale. These simple considerations help us see the importance of scale in the systems we work with every day. Geology is not alien to this. All geological data and interpretations are scale-dependent. A very common geological element is the facies. The facies are the bricks with which the models are built. Litofacies, seismofacies, eletrofacies, etc. The facies are scale-dependent therefore also the models, up to a concordant surface is scale-dependent. There are many tools in geology. Today, sequence stratigraphy is one of the main those used to predict facies. The right use of these tool, it translates into a better handling of the uncertainty and quantificat...
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