Two Inversion Case Studies from the SCOOP and STACK Area of Oklahoma

Chopra, Satinder (TGS Canada) | Sharma, Ritesh Kumar (TGS Canada) | Keay, James (TGS)

OnePetro 

Abstract

The Mississippian section, in particular the Meramec and the Devonian Woodford continue to be the preferred investment targets in the SCOOP/STACK trend in Oklahoma We showcase here the seismic characterization of these formations using multicomponent seismic data in the STACK area and the conventional vertical component seismic data in the SCOOP area, using deterministic prestack impedance inversion. The joint impedance inversion carried out over seismic data from the STACK area was used to derive rock-physics parameters (Young's modulus and Poisson's ratio), which showed the sweet spots that are distinct spatially, rather than bleeding off at the edges. The added advantage of joint inversion was that the density attribute could also be derived therefrom, which was not possible for the data from the STACK area. In addition to density, the results from prestack joint impedance inversion have been found to be superior to the simultaneous inversion. The equivalent attributes (besides density) derived for the SCOOP area also show promise.

Introduction

The Oklahoma SCOOP play extends about 200 miles along the east flank of the Anadarko Basin, and along with the STACK play, have become one of the most active unconventional plays in the US. The trend has gathered attention due to its potential for oil and liquids-rich gas yields, record-setting IP from wells, superior economics and proximity to pipelines and infrastructure. Consequently, oil companies are making huge investments in these plays.

SCOOP is an acronym for South Central Oklahoma Oil Province, and is spread over Carter, Garvin, Grady, McClain, Stephens, Jefferson, Love, Caddo, and Murray counties in Oklahoma. STACK stands for Sooner Trend (in) Anadarko (basin) Canadian and Kingfisher (counties). Most of the play is located across Canadian and Kingfisher counties, together with Blaine, Dewey (far west), Major, and Garfield (far north) counties. The SCOOP refers to geographic location while the STACK, also geographic, alludes to the considerable multi-zone potential in that area.