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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 53 (1969)

Issue: 9. (September)

First Page: 2036

Last Page: 2036

Title: Depositional Environments Defined by Dipmeter Previous HitInterpretationNext Hit: ABSTRACT

Author(s): J. A. Gilreath, J. S. Healy, J. N. Yelverton

Article Type: Meeting abstract


A new method of dipmeter Previous HitinterpretationNext Hit gives an estimation of water depth during deposition. This method is applied to high-resolution dipmeter surveys in which short-interval correlations are machine computed at closely spaced levels of the well.

The major premise is that these short-interval dip computations reflect the energy of the depositional environment. High-energy marine environments lead to a large scatter of dip magnitudes. Conversely, low-energy environments, such as found in deep water, lead to "layer-cake" deposition, and appear as uniform dip magnitudes on the dipmeter plot. Thus, the scatter of dip magnitude in a formation is the key by which the depositional water depth is interpreted to be shallow (less than 50 ft), medium, or deep (greater than 300 ft).

Comparisons with paleoecologic data indicate the Previous HitinterpretationNext Hit method to be both valid and useful. Exceptions to the rules for dipmeter Previous HitinterpretationNext Hit occur when the original bedding planes are distorted or overshadowed, as in fault zones, weathered formations underneath unconformities, marine slides, and heaving shales. Even with these exceptions, and partly because of them, the dipmeter Previous HitinterpretationTop and paleoecologic data augment each other in defining depositional environments.

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Copyright 1997 American Association of Petroleum Geologists