F.L. Wehr, 1993. "Effects of Variations in Subsidence and Sediment Supply on Parasequence Stacking Patterns", Siliciclastic Sequence Stratigraphy: Recent Developments and Applications, Paul Weimer, Henry Posamentier
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Local changes in rates of subsidence or sediment influx along a basin margin will influence the stacking of parasequences and systems tracts, and can cause boundaries between systems tracts to occur at different times in different parts of a basin. Systems tracts, therefore, are not necessarily time equivalent, and easily correlated intervals, such as condensed sections or maximum flooding surfaces, cannot be assumed to be regionally synchronous. The sequence boundary can be more difficult to recognize because of its variable and sometimes subtle expression. However, it is a more reliable chronostratigraphic surface because its timing is much less dependent upon local variations in subsidence and sediment influx.
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Applying depositional sequence stratigraphic concepts to the interpretation of siliciclastic depositional systems is becoming an increasingly important tool in petroleum geology. After a succession of breakthroughs during the 1970s and 1980s, sequence stratigraphic concepts now have entered a phase of intense application and documentation, especially with regard to successful implementation in the field of petroleum geology. Workers have applied these concepts to a variety of databases, ranging from outcrop to cores to electric logs and to multifold seismic data. Clearly, sequence stratigraphic concepts embody–not a rigid model or template–but rather a way of looking at geology. This volume has two purposes: to compile some recent applications of siliciclastic sequence stratigraphic concepts, and to present new studies focused on refining conceptual models. This memoir grew out of a 1991 symposium, "Variations in Depositional Systems Within a Sequence Stratigraphic Framework: Applications to Exploration," organized by the authors at the AAPG annual meeting at Dallas. Robert Loucks and Rick Sarg have edited a companion volume, also published by AAPG,“Entitled Carbonate Sequence Stratigraphy: New Developments and Applications.”