Thursday, March 26, 2015

Seismic Sequence Stratigraphy chapter 3

If the clastic unit is followed by fine-grained deposits, an onlap relationship may be inferred.

In fine-grained deposits , bedding planes are generally subparallel and exteremely laterally extensive compared to bed thickness. Deposition is almost entirely from suspension load, and bedding planes and lithological change result from lithification, variations in sediment accumulation rate, etc. In these cases bedding planes, approximate to, or parallel, time lines. Gaps, even if geologically significant, will also tend to parallel time lines. From the relationship of thickness to lithology we can also conclude that time lines will be more closely spaced in fine grained sequences than in sand-sized grain deposits.


Reference : Practical Seismic Interpretation, Michael E. Badley

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