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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 55 (1971)

Issue: 2. (February)

First Page: 367

Last Page: 368

Title: Time Stratigraphy from Previous HitSeismicNext Hit Data: ABSTRACT

Author(s): Peter R. Vail, John B. Sangree

Article Type: Meeting abstract


The Previous HitseismicNext Hit reflection process expresses the interbedding of sediments as a pattern of Previous HitseismicNext Hit cycles which

End_Page 367------------------------------

parallel time-stratigraphic bedding surfaces. Changes in rock stratigraphy, that is, lithology and facies, are expressed as changes in Previous HitseismicNext Hit parameters such as amplitude and interval velocity; these changes may occur within time-stratigraphic units, or may transgress the pattern of time-stratigraphic zones. Previous HitSeismicNext Hit stratigraphy is limited by the resolution of the Previous HitseismicNext Hit system and is somewhat complicated by the need to exclude unwanted signals, such as coherent noise patterns. Nevertheless, high-resolution Previous HitseismicNext Hit sections are the most powerful tool available to modern stratigraphers.

Two studies document the relation of bedding surfaces to Previous HitseismicNext Hit reflections. Well log correlations, Previous HitseismicNext Hit sections, a Previous HitseismicNext Hit model study, and a synthetic seismogram study document time-stratigraphic and rock-stratigraphic relations in Oligocene-Miocene strata in a South American basin. The second study involves a Previous HitseismicTop line shot in the western United States across a series of wells spaced about 1 mi apart. Lateral facies changes within interfingering Cretaceous marine and nonmarine sediments demonstrate the continuity of time-stratigraphic surfaces and of reflections across major facies changes.

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