Geographic Coverage of the Database

Does the Significant Oil and Gas Fields of the United States Database cover the entire United States? Are the Gulf of Mexico and Alaska included?

The Database covers the entire United States except for the older fields of the Appalachian Basin and the Cincinnati Arch. Fields in these two provinces are excluded because most were discovered between 1859 and 1925; thus nearly all of the field and reservoir data we normally provide were never reported for these fields. The Database provides complete coverage for all significant fields and reservoirs in the Gulf of Mexico and Alaska.

For further information, see THE DATABASE: Scope

Unconventional Coverage

Does the Database include unconventional plays?

The Database has been providing information on unconventional plays for nearly 25 years, beginning with tight sandstone gas and coalbed methane plays in the early 1990s. During the past decade, we have added shale gas and tight oil plays to our coverage as well. Our unconventional coverage emphasizes providing appropriate definition and differentiation of unconventional formations, as well as meaningful data organization and integration.

Deepwater Coverage

Does the Database provide information on deepwater fields in the Gulf of Mexico?

The Database provides extensive coverage on the deepwater fields of the Gulf of Mexico. The latest version of the Database includes field and reservoir records on 224 fields in the deepwater lease areas and summary information on another 62 deepwater discoveries. The Database also provides extensive information within a play context on all deep (greater than 15,000' TVD) shelf reservoirs.

Number of Fields in the Database

Does the Database include all oil and gas fields in the United States?

The Significant Oil and Gas Fields of the United States Database, as the name implies, includes only significant fields, that is, fields with a known recovery (the sum of cumulative production and proved reserves) of 500,000 BOE (3 BCFE) or more. The current version of the Database contains more than 17,000 fields. In most geologic provinces, particularly the larger ones, these significant fields contain 98.0 - 99.9% of the discovered resources.

Information Within the Database

Does the Database only provide estimates of field and reservoir production and reserves?

Estimates of field and reservoir production and reserves are a key feature of the Database. The primary value of the Database, however, comes from its integration of current field and reservoir production and reserve data with a broad variety of other types of field and reservoir data including location, discovery history, reservoir rock and fluid characteristics, and recent growth and size histories.

For a detailed description of the content of the Database, see FIELD INFORMATION and RESERVOIR INFORMATION

Source of Reserve Estimates in the Database

Who provides the field and reservoir proved reserve data in the Database?

Nehring Associates staff estimate all the proved developed reserve data provided in the Database. These estimates are made annually using the most appropriate decline curve for each field and reservoir. We also compare and correlate the sum of our field estimates by product for each geopolitical area (states and districts) to the area estimates provided annually by the Energy Information Administration (EIA). For the hundred largest oil and gas fields by remaining reserves (which contain 61% of both national oil and gas reserves), we also infer field reserves from EIA’s annual published lists of these fields.

Well Data in the Database

Does the Database include well data?

The emphasis of the Database is to provide field, reservoir, and play information. However, with the release of the Well Cross-Reference Table in 2014, we have also linked more than two million producible completions in the U.S. to these fields, reservoirs, and plays. The Well-Cross Reference Table provides capabilities both to analyze drilling activity by play and to link the Database to the great variety of available well data, such as monthly production histories by well.

Play Definitions in the Database

Does the Database only use the play definitions developed by Nehring Associates?

The Significant Oil and Gas Fields of the United States Database was the first publicly available source of nationwide play definitions. Because we recognize the value of different perspectives on play definition, we have also incorporated in the Database two other sets of play definitions: the U.S. Government (USG) and the Gas Research Institute (GRI) play definitions.

Database Availability

Is the Database only available through a licensing agreement with Nehring Associates?

The Significant Oil and Gas Fields of the United States Database is available for your use either through a Database license or through Nehring Associates’ Basin and Play Evaluation Service. License agreements are best for those customers intending repeated, intensive use. Data retrievals using the Basin and Play Evaluation Service are best for those who only need the Database for limited one-time uses.

For further information see LICENSING or BASIN & PLAY EVALUATION SERVICE