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SWLGS Luncheon Topics

Updated January 20, 2004

September 10, 2002

3d Seismic Recognition Of The Jurassic Smackover Reservoir of Grayson Field
Using Leading Edge Reservoir Characterization Seismic Processing

Kevin B. Hill

Abstract Summary: The discovery well at Grayson Field was drilled on a four-way dip closure defined by only three 2D seismic lines. Investors were hoping to find a maximum of 30-40 feet of pay. After the discovery of 140 feet of gross pay in the Jurassic Smackover limestone in February 1993, the participants decided that a 3D seismic program was needed. The objective of the 3D seismic program was to define the structural and stratigraphic limits of the new field.

This paper compares the results of different processing techniques on the Grayson 3D seismic volume. Specific processing and interpretive tools available to the explorationist will be covered, illustrated with many different seismic displays. Evidence will be presented that 1) relative amplitude of the Smackover reflector does not define the reservoir's stratigraphic parameters, 2) attributes of the acoustic impedance data (velocity) show good statistical correlation to key reservoir parameters, 3) A.V.O. analysis shows a hydrocarbon indicator over the reservoir, and 4) reservoir characterization (petrophysical) data generated with the 3D seismic data delineates the production, 5) gas effect, water saturation, and hydrocarbon saturation within the reservoir are clearly defined.

Through the use of fully integrated sub-surface well information and 3D seismic data set, the thinner upper pay interval can be discerned from the thicker main pay. The reprocessed seismic data defines a new pay interval in the field. Results of recent horizontal drilling prove that the expenses associated with the 3D seismic were well worth the money.

Biographical Sketch: Kevin B. Hill is a geophysical consultant with more than 25 years of broad Gulf Coast and international experience in exploration and production geophysics and geology. Mr. Hill specializes in integrating state-of-the-art geophysical technologies with geology, and has designed and interpreted numerous 2-D and 3-D seismic surveys in the Jurassic, Cretaceous, and Tertiary plays of the Gulf Coast basins in Texas, Louisiana, Arkansas, Mississippi and Alabama.

Mr. Hill was involved in the original design of the Kingdom PC based 3D seismic workstation software. He teaches courses on using Seismic Micro-Technology, Inc. Kingdom software at schools around the world.

Hill received a BS-Professional Degree in Geology in 1977 from Louisiana State University, Baton Rouge, LA Prior to becoming a consultant in 1987, he worked as Senior Exploration Geophysicist for Sonat Exploration in Shreveport, LA; Regional Exploration Geophysicist for Forest Oil Corporation in Lafayette, LA and Jackson MS; and as a Senior Geophysicist for Cities Service Company in Tulsa, OK and Jackson, MS. Hill has authored and presented numerous technical papers at Gulf Coast professional society meetings. At the 51st GCAGS convention, in 2001, he received the First Place Excellence of Presentation award and the A.I. Levorsen Award.

Mr. Hill is a member of the AAPG, SEG, SGS, and Commandeur in the Confrerie des Chevaliers du Tastevin.