Photostratigraphic Characteristics of Sequence Stratigraphic Features and Patterns: Upper Cretaceous and Eocene Strata of the South-Central Pyrenees, Spain
Maria Sgavetti, 1993. "Photostratigraphic Characteristics of Sequence Stratigraphic Features and Patterns: Upper Cretaceous and Eocene Strata of the South-Central Pyrenees, Spain", Siliciclastic Sequence Stratigraphy: Recent Developments and Applications, Paul Weimer, Henry Posamentier
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Depositional sequences and their associated key surfaces are expressed in aerial photographs by specific surfaces, photofacies, and photostratigraphic units. Some examples of aerial photographic characteristics of depositional sequence boundaries, distinct systems tracts, and transgressive and downlap surfaces are discussed. These examples are from Upper Cretaceous and Eocene strata of the south-central Pyrenees, where accurate photostratigraphic analysis and detailed stratigraphic sedimentological observations in the field have been integrated. Such an integrated approach is a useful tool for high-resolution description of outcrop sequence stratigraphy units and surfaces on a scale approaching multifold seismic reflection scale.
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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.”