Where We Are Working
There are 487 onshore oil and gas fields in California; these were classified as high, medium, and low priority for detailed study as part of the COGG program based on the intensity of petroleum resource development and proximity to groundwater resources (Davis and others, 2018). Each year, a new set of high priority fields is selected based on feedback from the State Water Board and Regional Boards. The map shows what kind of work has been done in which fields to date.
Davis, Tracy A., Landon, Matthew K., and Bennett, George L.V, 2018, Prioritization of oil and gas fields for regional groundwater monitoring based on a preliminary assessment of petroleum resource development and proximity to California’s groundwater resources, U.S. Geological Survey, Scientific Investigations Report, SIR 2018- 5065, DOI: 10.3133/sir20185065
Metzger, Loren F., and Landon, Matthew K., 2018, Preliminary groundwater salinity mapping near selected oil fields using historical water-sample data, central and southern California, U.S. Geological Survey, Scientific Investigations Report 2018- 5082, DOI: 10.3133/sir20185082