Field · the network on the US Outer Continental Shelf
GC478
GC478 is a field on the US Outer Continental Shelf, operated by Murphy Exploration & Production Company - USA. The map shows the owners.
Converted: Converted from the source's figures (Jul 2025–Jun 2026). Oil equivalent by the Norwegian Offshore Directorate's rule: oil, condensate and NGL in Sm³ count equally, 1,000 Sm³ of gas = 1 Sm³ o.e. and 1 tonne of NGL = 1.9 Sm³ o.e. Converted from barrels: 1 barrel = 0.158987 m³ (42 US gallons). The source's barrels are at 60 °F and Sm³ at 15 °C; the difference is under 0.1%. Converted from Mcf: 1 Mcf (60 °F, 14.73 psia) ≈ 28.33 Sm³ (15 °C, 101.325 kPa).
Estimate: Oil equivalent by the Norwegian Offshore Directorate's rule: oil, condensate and NGL in Sm³ count equally, 1,000 Sm³ of gas = 1 Sm³ o.e. and 1 tonne of NGL = 1.9 Sm³ o.e. Converted from barrels: 1 barrel = 0.158987 m³ (42 US gallons). The source's barrels are at 60 °F and Sm³ at 15 °C; the difference is under 0.1%. Converted from Mcf: 1 Mcf (60 °F, 14.73 psia) ≈ 28.33 Sm³ (15 °C, 101.325 kPa). Per day: Sm³ o.e. × 6.29 barrels per Sm³ divided by the number of days in the period. Rounded to the nearest 10 below 1,000, the nearest 100 below 10,000 and the nearest 1,000 above that.
Attribution: Source: BOEM/BSEE Data Center, OGOR-A
The network
From owner to landfall. Links without their own label have their source in the column heading; curated and derived links are labelled at the link.
- The colour shows the content:
- Gas
- Oil
- Condensate
- CO₂
- Oil and condensate
- The line shows the source:
- pipeline in BOEM/BSEE data
- curated, with the source at the link
- possible onward route, not measured flow
- planned or not in service
The links show direction, not volume.
G35662
- Murphy Exploration & Production Company - USA operator34%from 1 Jan 2019
- Red Willow Offshore, LLC22.5%from 27 Apr 2017
- Ridgewood Serpent, LLC17%from 1 Apr 2024
- ILX Prospect Mormont, LLC11.33%from 1 Apr 2024
- Ridgewood Rialto Holdings, LLC5.67%from 1 Apr 2024
- HEDV KLM, LLC5.5%from 1 Jan 2021
- CL&F Offshore LLC4%from 20 Feb 2017
A share in a lease is not a field share.
BOEM · 4 Oct 2026- The fieldGC478Producing1.77 million Sm³ o.e. Jul 2025–Jun 2026operator: Murphy Exploration & Production Company - USAFacilities and pipelines
No facilities in service at BOEM/BSEE
LandfallThe source does not show where the production comes ashore.
Production per month
The source's figures in the source's unit. The oil equivalents in the key figures are converted by the Norwegian Offshore Directorate's rule.
Production per monthBOEM · 7 Oct 2026
| Month | Oil bbl | Gas Mcf |
|---|---|---|
| June 2026 | 735,717 | 530,919 |
| May 2026 | 680,023 | 503,961 |
| April 2026 | 704,395 | 523,834 |
| March 2026 | 837,482 | 575,403 |
| February 2026 | 727,195 | 528,862 |
| January 2026 | 863,782 | 604,942 |
| December 2025 | 866,862 | 615,523 |
| November 2025 | 864,457 | 612,258 |
| October 2025 | 927,479 | 668,694 |
| September 2025 | 925,722 | 683,101 |
| August 2025 | 940,323 | 697,466 |
| July 2025 | 807,536 | 609,246 |
| June 2025 | 964,644 | 718,915 |
Attribution: Source: BOEM/BSEE Data Center, OGOR-A
Leases
The leases the field lies in, with the licensees as the source states them. A share in a lease is not a field share.
LeasesBOEM · 4 Oct 2026
| Name | Type | Operator | Licensees |
|---|---|---|---|
| G35662 | lease | Murphy Exploration & Production Company - USA | Murphy Exploration & Production Company - USA 34%, Red Willow Offshore, LLC 22.5%, Ridgewood Serpent, LLC 17%, ILX Prospect Mormont, LLC 11.33%, Ridgewood Rialto Holdings, LLC 5.67%, HEDV KLM, LLC 5.5%, CL&F Offshore LLC 4% |
Notes
- The shares are per lease in the source. A lease share is not a field share, and it is not combined with the field's production.
- BOEM's shares are record title shares per lease. They are not the participation shares in the unit agreements, which are not public, and not necessarily the working interests (operating rights). The fields therefore have no ownership shares; the shares are per lease, and production by share is calculated per lease.
- The ownership history is BOEM's own: each assignment has an effective date, and a share applies from that date until the day before the next change. Shares that ended before 2020 are not included.
- The leases in the Gulf of Mexico are included when they belong to a field in BOEM's field list or have production in Jun 2025–Jun 2026. 1176 leases with current owners, most of them in the exploration term, are not included in the overview.
- The production is BOEM/BSEE's OGOR-A figures per completion, summed per lease and per field for Jun 2025–Jun 2026: oil and condensate in barrels (bbl), gas in Mcf. The figures come three to four months after the production month, and BOEM marks the latest month as incomplete.
- The field operator is the operator BOEM/BSEE gives for the completions in the latest month. The lease operator is the designated operator. The operator and field of the installations are from BOEM's platform file (platmast).
- BOEM has no field outlines. The field's position is the centre of the blocks BOEM links to the field (Gulf of Mexico) or of the leases the field produces from (Pacific).
- The fields are named as in BOEM's list of nicknames. Fields without a nickname are shown with BOEM's field code (for example MC392), and in the Pacific BOEM gives only the field code (HONDO, DSCDRS).
- The share estimate per field is OESA's calculation: the record title share in each lease in the field, weighted by the lease's production from the field in oil equivalent (Jul 2025–Jun 2026), with the share that applied in each month. It is not the field's ownership and is not used in sums; the sums are calculated per lease.
Sources
All figures and links on the page come from these sources. The licence and attribution are as each source requires. Conversions and calculations are OESA's own and labelled with the method.
- BOEM – field names and leases (Field Names Master List, Appendix A) BOEM / BSEE · 7 Oct 2026Licence: U.S. Government Work, public domain (17 U.S.C. § 105)Attribution: Source: BOEM/BSEE Data Center
- BOEM – lease owners with designated operator (Gulf, Pacific, Alaska) BOEM / BSEE · 4 Oct 2026Licence: U.S. Government Work, public domain (17 U.S.C. § 105)Attribution: Source: BOEM/BSEE Data Center
- BOEM/BSEE – well production by month (OGOR-A, Gulf of Mexico) BOEM / BSEE · 7 Oct 2026Licence: U.S. Government Work, public domain (17 U.S.C. § 105)Attribution: Source: BOEM/BSEE Data Center, OGOR-A
Not in the data: Flow in each pipeline, where the gas ends up, and the buyers of oil and gas.