--> Abstract: Sequence Stratigraphy and High-Frequency Cycles: New Aspects for a Quantitative Evaluation of the Gulf of Suez Basin, Egypt, by S. D. Nio, C. S. Yang, N. Tewfik, M. Darwish, and H. Jonkman; #90990 (1993).
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NIO, S. D., and C. S. YANG, International Geoservices, Leiderdorp, Netherlands; N. TEWFIK and M. DARWISH, Earth Resources Exploration, Cairo, Egypt; and H. JONKMAN, International Geoservices, Leiderdorp, Netherlands

ABSTRACT: Sequence Stratigraphy and High-Previous HitFrequencyNext Hit Cycles: New Aspects for a Quantitative Evaluation of the Gulf of Suez Basin, Egypt

A new development in the application of sequence stratigraphic concepts in marine as well as continental basins is the recognition of high-Previous HitfrequencyNext Hit cyclic patterns in rock successions in the subsurface. Studies of six wells from the northern, central, and southern parts of the Gulf of Suez show the presence of well-preserved, high-Previous HitfrequencyNext Hit cycles with periodicities similar to the orbitally forced Milankovitch parameters. Subsurface rock successions, third-order sequences, and high-Previous HitfrequencyNext Hit cycles were compared with outcrops. After establishing the biostratigraphic framework for the above-mentioned wells, a sequence analysis was performed. Sequence boundaries and maximum flooding positions in each well were calibrated with the occurrences and evaluation of the high-Previous HitfrequencyNext Hit cycles. It became obvious that there is an intimate relationship between these high-Previous HitfrequencyNext Hit Milankovitch cycles and sequence organization. In addition, a close relationship can be observed in the subsurface as well as in outcrops between high-Previous HitfrequencyNext Hit climatic changes (connected to the Milankovitch cycles) and (litho)facies variability. Quantitative evaluations of each sequence and/or systems tract can be computed with the International Geoservices' cyclicity analysis tool (MILABAR). The results are summarized in a well composite chart, which includes interval time estimates (ITE), net accumulation rates (NAR), and ratio of preserved time. In correlations between the wells, an accuracy of 500-100 Ka can be obtained. The quantitative evaluation of the sequence and high-Previous HitfrequencyTop cycle analysis gave some new aspects concerning the (litho)facies and geodynamic development during the pre- as well as the synrift stages of the Gulf of Suez Basin.

AAPG Search and Discovery Article #90990©1993 AAPG International Conference and Exhibition, The Hague, Netherlands, October 17-20, 1993.