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AAPG Bulletin

Abstract

AAPG Bulletin, V. 97, No. 2 February 2013), P. 201221.

Copyright copy2013. The American Association of Petroleum Geologists. All rights reserved.

DOI:10.1306/06011212029

Frequency-dependent Previous HitseismicNext Hit-stratigraphic and facies interpretation

Hongliu Zeng1

1Bureau of Economic Geology, Jackson School of Geosciences, University of Texas at Austin, Austin, Texas; [email protected]

ABSTRACT

In this study, Previous HitseismicNext Hit models and a Starfak and Tiger Shoal fields data set in the Gulf of Mexico Basin are used to investigate uncertainties caused by the frequency dependence of Previous HitseismicNext Hit data and solutions for avoiding pitfalls in Previous HitseismicNext Hit-stratigraphic and facies interpretation. Previous HitSeismicNext Hit amplitude and instantaneous attributes, along with stratigraphic interpretation of these attributes, are controlled by Previous HitseismicNext Hit interference, or tuning, between thin geologic units. Previous HitSeismicNext Hit-tuning effects include thickness tuning and frequency tuning, which cause nonlinear variations of reflection amplitude and instantaneous Previous HitseismicNext Hit attributes with thickness and/or data frequency. Previous HitSeismicNext Hit modeling shows that, whereas thickness tuning determines Previous HitseismicNext Hit-interference patterns and, therefore, occurrence of Previous HitseismicNext Hit events and Previous HitseismicNext Hit facies in layered rock, frequency tuning may further influence the nature of the correlation of Previous HitseismicNext Hit data and geologic time and modify Previous HitseismicNext Hit facies. Frequency dependence offers a new dimension of Previous HitseismicNext Hit data, which has not been fully used in Previous HitseismicNext Hit interpretation of geology.

Field-data examples demonstrate that a stratigraphic formation is typically composed of lithofacies of varying thicknesses, and a broadband, stacked Previous HitseismicNext Hit data set is not necessarily optimal for stratigraphic and facies interpretation. Although it is difficult to predict correct frequency components for interpretation of not-yet-known geologic targets, local geologic models and well data can be used to optimize the frequency components of Previous HitseismicNext Hit data to a certain degree and intentionally modify Previous HitseismicNext Hit-interference patterns and Previous HitseismicNext Hit facies for better Previous HitseismicTop interpretation of geologic surfaces, sediment-dispersal patterns, geomorphology, and sequence stratigraphy.

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