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The AAPG/Datapages Combined Publications Database

GCAGS Transactions

Abstract


Gulf Coast Association of Geological Societies Transactions
Vol. 51 (2001), Pages 121-131

Previous Hit3-DNext Hit Previous HitSeismicNext Hit Recognition of the Jurassic Smackover Reservoir of Grayson Field Using Leading-Edge Reservoir Characterization Previous HitSeismicNext Hit Processing

Kevin B. Hill

ABSTRACT

The discovery well at Grayson Field was drilled on a four-way dip closure defined by only three 2D Previous HitseismicNext Hit 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 Previous HitseismicNext Hit program was needed. The objective of the 3D Previous HitseismicNext Hit program was to define the Previous HitstructuralNext Hit and stratigraphic limits of the new field.

This paper compares the results of different processing techniques on the Grayson 3D Previous HitseismicNext Hit volume. Specific processing and interpretive tools available to the explorationist will be covered, illustrated with many different Previous HitseismicNext Hit 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 Previous HitdataNext Hit (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) Previous HitdataNext Hit generated with the 3D Previous HitseismicNext Hit Previous HitdataNext Hit delineates the production.

Through the use of this fully integrated sub-surface well information and 3D Previous HitseismicNext Hit Previous HitdataNext Hit set, the thinner upper pay interval can be discerned Previous HitfromNext Hit the thicker main pay. The reprocessed Previous HitseismicNext Hit Previous HitdataNext Hit defines a new pay interval in the field. Results of recent drilling prove that the 3D Previous HitseismicNext Hit Previous HitdataNext Hit expense was well worth the money.


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