Stockholm Southwest Field

MILLER, WILLIAM A., Pacific Enterprises Oil Company, USA, Denver, CO, LAWRENCE G. BROWN, United States Navy, Denver, CO, EMILY M. HUNDLEY-GOFF, Marathon Oil Company, Houston, TX, and STEPHEN L. VEAL, DCX Resources, Denver, CO

The Stockholm Southwest (SW) field, discovered by Texas Oil and Gas Production Corporation in March 1979, is located in southwest Wallace and northwest Greeley Counties, Kansas, and eastern Cheyenne County, Colorado. It consists of 87 original oil wells which have produced 5.5 million bbl of oil. As of the middle of 1989, it was producing almost 1200 bbl of oil/day from 66 active wells.

Regionally, the Stockholm SW field is situated on a stable Paleozoic platform which extended north from the Anadarko basin. During early late Morrowan time, there was a significant regression of the Anadarko sea. The subsequent Stockholm fluvial system created an erosional valley which was later back-filled with fluvial and estuarine sediments during transgressions of the Anadarko sea. Regionally, the upper Morrow section is approximately 85 ft (26.2 m) thick, whereas it is approximately 150 ft (46.2 m) thick in the Stockholm Valley. This striking thick can be mapped seismically. Subsequent valley systems subparalleled the preexisting Stockholm Valley system, depositing the overlying Johannes sandstone, which is a secondary pay at Stockholm SW.

Since the discovery of Stockholm SW field, subsequent exploration activity has extended the productive trend five townships in a north-south direction along the Colorado/Kansas border. This activity has led to the discovery of eight new oil fields. Conservative engineering estimates indicate approximately 170 million bbl of oil in place in the entire trend.

AAPG Search and Discovery Article #91008©1991 AAPG Mid-Continent Section Meeting, Kansas Geological Society, Wichita Kansas, September 22-24, 1991 (2009)