Application of High-Resolution Sequence Stratigraphy to the Upper Rotliegend in the Netherlands Offshore
Chang-Shu Yang, Swie-Djin Nio, 1993. "Application of High-Resolution Sequence Stratigraphy to the Upper Rotliegend in the Netherlands Offshore", Siliciclastic Sequence Stratigraphy: Recent Developments and Applications, Paul Weimer, Henry Posamentier
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The Upper Rotliegend Group in the Netherlands offshore is reevaluated with (1) a sequence stratigraphic analysis and correlation over 150 wells throughout the Netherlands offshore, and (2) a high-resolution cyclicity analysis of each sequence.
Climate change was the driving force controlling the sequence development and sedimentary facies distribution in the Upper Rotliegend continental basin. Sequence boundaries represent the maximum rate of increasing aridity causing rapid fall of the lake level and groundwater table, followed by a period of lowstand of the lake. Maximum flooding surfaces represent the maximum rate of increasing humidity causing rapid rise of the lake level and groundwater table, followed by a period of highstand of the lake. The systems tract is characterized by the bounding-surface type, the position within the sequence, and the climate-controlled sedimentary facies patterns. With this concept, 12 third-order sequences, which belong to five supersequences, have been discerned and correlated in the Upper Rotliegend of the Netherlands offshore. Their distribution shows a successive onlapping onto the basin flank.
Spectral analysis reveals a number of higher-order cycles (wavelengths 1 to 10 m) within the third-order sequences. The ratios between these wavelengths are very close to the ratios between Milankovitch periods for the Early Permian; therefore, these higher-order cycles are linked to the Milankovitch cycles. Using this approach, most third-order sequences can be estimated to have a duration of 0.7–1.4 m.y and net sediment accumulation rates of 6–11 cm/k.y. The Upper Rotliegend of the Netherlands has a time duration of 10.7 m.y. (266.8–256.1 Ma), i.e., within the Artinskian and the Kungurian stages.
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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.”