Abstract
A twenty-mile S-wave seismic line was acquired on the northeastern shelf of the Anadarko basin by the 1977-1978 Conoco P-Wave/S-Wave Group Shoot. The resolution of the S-wave section is at least as good as the resolution of a coincident P-wave section acquired in 1975. The top and bottom of a collection of Paleozoic carbonates called the Hunton group can be identified on both sets of data. P and S traveltimes and traveltime ratios delineate lateral variations in the thickness and average porosity of the Hunton. Where the pore space is saturated with liquid, a systematic increase in average porosity from less than 2 percent to about 11 percent correlates with an increase in the S/P traveltime ratio from 1.84 to 1.96. The ratio decreases to values between 1.65 and 1.80 at two places along the line, probably indicating that the pore space is partially gas-saturated at these locations. The data are consistent with the seismic response of a petrophysical model of the Hunton in which a majority of the pore shapes are elongated rather than round.