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Dissertation/Thesis Abstract

A Geologic and Geophysical Study of Lirette Field and its Associated Seismic Velocity Variations in Terrebonne Parish, Louisiana
by Etienne, Jeffrey Serge, M.S., University of Louisiana at Lafayette, 2013, 65; 1553883
Abstract (Summary)

The thick section of hydrocarbon-bearing Miocene rocks present in and around Lirette Field, Terrebonne Parish, Louisiana, have made the area a significant source of oil and gas production for almost a century. As development of fields like Lirette has proceeded, the remaining areas for potential undiscovered reserves become smaller and more difficult to identify. At Lirette, the most complete structural interpretation of the field is from integrated 3D seismic and subsurface mapping. Differences between mapped seismic horizons and their equivalent depths measured from well logs occur throughout Lirette field. These “mis-ties” between 3D seismic 2-way time and subsurface depth data are laterally significant and variable in their magnitude, leading to the conclusion that there are lateral velocity variations within Lirette Field. To mitigate this issue, two separate correction techniques were employed. First, using software included in Seismic Micro Technology’s (SMT) EarthPAK program, the average velocity method was used, which aims to correct for seismic mis-ties by assigning a velocity gradient to each well where data are available. A second, more rigorous method was used, the delta difference hand drawn velocity correction method, which relies on the same principles as the average velocity method, but relies on the interpreter to map the velocity variations. These two techniques were applied to a series of productive sands from 6000’ to 11,500’ in depth and the results examined to test their effectiveness in producing the most accurate structural picture of Lirette Field.

Indexing (document details)
Advisor: Richter, Carl
Commitee: Deux, Timothy, Lock, Brian
School: University of Louisiana at Lafayette
Department: Geology
School Location: United States -- Louisiana
Source: MAI 52/06M(E), Masters Abstracts International
Subjects: Geology, Geophysics
Keywords: Lirette Field, Louisiana, Velocity variations
Publication Number: 1553883
ISBN: 978-1-303-82302-2
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