South Marsh Island 257 is a producing conventional oil field located in shallow water in the US and is operated by Helis Oil & Gas. According to GlobalData, who tracks more than 34,000 active and developing oil and gas fields worldwide, the field is located in block South Marsh Island 257, with water depth of 30 feet. Buy the profile here.

Field participation details

The field is owned by China National Offshore Oil, CL&F Resources, He&D Offshore, Helis Oil & Gas and Houston Energy.

Production from South Marsh Island 257

The South Marsh Island 257 conventional oil field recovered 99.45% of its total recoverable reserves, with peak production in 2020. The peak production was approximately 0.93 thousand bpd of crude oil and condensate and 2.00 Mmcfd of natural gas. Based on economic assumptions, production will continue until the field reaches its economic limit in 2026.

Remaining recoverable reserves

The field is expected to recover 0.04 Mmboe, comprised of 0.04 Mmbbl of crude oil & condensate and 0.00 bcf of natural gas reserves.

About Helis Oil & Gas

Helis Oil & Gas Co LLC (Helis Oil) operates as an oil and gas company. The company is principally involved in exploration and production of crude oil and natural gas. In addition, Helis Oil also provides energy related services like oil & gas exploration services, oil & gas field services as well as natural gas distribution. Helis Oil was formerly known as William G. Helis Company, LLC. Helis Oil is headquartered in New Orleans, Louisiana, the US.

For more details on the South Marsh Island 257 Conventional Oil Field, buy the profile here.


GlobalData, the leading provider of industry intelligence, provided the underlying research used to produce this article.

This information is drawn from GlobalData’s Oil & Gas Intelligence Center, which provides detailed profiles of 34,000+ oil and gas fields, 400,000+ exploration blocks, 1,100+ LNG terminals, 3,400+ gas processing plants, 5,000+ storage terminals, and 8,000+ pipelines, 1,400+ refineries and 13,000+ petrochemical plants worldwide.