Grayson Field Jurassic Smackover limestone reservoir, Columbia County, Arkansas: a case study using leading edge reservoir characterization seismic processing of 3D seismic data

Abstract

The discovery well at Grayson Field, Columbia County, Arkansas, was drilled on a four‐way dip closure defined by three 2D seismic lines. Investors were hoping to find a maximum of 100 feet of pay. After the discovery of 158 feet of pay at 8000 feet measured depth in the Jurassic Smackover limestone in January 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. Specific processing and interpretive tools will be 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 (Inversion) shows good statistical correlation to key reservoir parameters, 3) A.V.O. shows a hydrocarbon indicator over the reservoir, and 4) reservoir characterization data (petrophysical volumes delineates the production.