TENNYSON, MARILYN E., U.S. Geological Survey, Denver, CO, and CAROLINE M. ISAACS, U.S. Geological Survey, Menlo Park, CA
ABSTRACT: U.S. Geological Survey National Assessment of Oil and Gas Resources: Pacific Region Onshore and State Offshore
The U. S. Geological Survey and the Minerals Management Service have undertaken a new assessment of the nation's oil and gas resources, based on play analysis, to be complete by 1995. The U.S. Geological Survey is responsible for the onshore and state waters, and the Minerals Management Service for the federal offshore. The assessment is being done in consultation with industry and state and other federal agencies. Special emphasis will be given to unconventional resources (coalbed methane, tight gas, heavy oil, deep gas, gas hydrates) and fractured horizontally drilled reservoirs.
The Pacific Region includes all of Washington, most of Oregon, and most of California west of the Sierra Nevada and the San Andreas fault. The region is divided into 13 provinces: Western Washington-Oregon, Eastern Washington-Oregon, Klamath-Sierra Nevada, Northern Coast, Central Coast, Sacramento, San Joaquin, Sonoma-Livermore, Santa Maria, Santa Barbara-Ventura, Los Angeles, San Diego-Oceanside, and Salton Trough. Teams responsible for assessing each province are defining both proven and conceptual plays. The province teams assign discovered fields to plays and evaluate the likelihood and range of possible further resources in each proven play, including reserve growth. Field-size distributions and discovery process modeling as well as conventional exploration approaches will be emp oyed in analyzing mature provinces. In poorly explored areas, geological analysis and use of analogs from other better explored areas will play a greater role. Early in 1995, the analysis of each province will be complete, including an estimate of the range of volumes of oil and gas that it could contain.
AAPG Search and
Discovery Article #90992©1993 AAPG Pacific Section Meeting, Long Beach,
California, May 5-7, 1993.