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.
|Commitee:||Deux, Timothy, Lock, Brian|
|School:||University of Louisiana at Lafayette|
|School Location:||United States -- Louisiana|
|Source:||MAI 52/06M(E), Masters Abstracts International|
|Keywords:||Lirette Field, Louisiana, Velocity variations|
Copyright in each Dissertation and Thesis is retained by the author. All Rights Reserved
The supplemental file or files you are about to download were provided to ProQuest by the author as part of a
dissertation or thesis. The supplemental files are provided "AS IS" without warranty. ProQuest is not responsible for the
content, format or impact on the supplemental file(s) on our system. in some cases, the file type may be unknown or
may be a .exe file. We recommend caution as you open such files.
Copyright of the original materials contained in the supplemental file is retained by the author and your access to the
supplemental files is subject to the ProQuest Terms and Conditions of use.
Depending on the size of the file(s) you are downloading, the system may take some time to download them. Please be