NF
Marcellus Shale (Seneca / Appalachian)
Oil Gas
Type
Operating
Status
🇺🇸 United States, Pennsylvania (Appalachian Coal Basin)
Country
Project information
As at 30 September 2025
Aggregation level:
Play or complex
Aggregation level:
Play or complex
Report standard:
Sec S K 1200
Report standard:
Sec S K 1200
Ownership %:
100
Ownership %:
100
Operator:
Yes
Operator:
Yes
Extraction:
Unconventional Shale
Extraction:
Unconventional Shale
Description
As at 30 September 2025
Marcellus Shale fields operated by Seneca Resources in PA Appalachian Region (which exceed 15% of total proved reserves). FY2025 production declined to 574 MMcfe/d from 645 MMcfe/d in 2024 as capital was reallocated to Utica. PUD reserves declined sharply from 342 Bcfe to 197 Bcfe as 145 Bcfe of PUDs were converted to developed reserves. Lifting cost $0.72/Mcfe.
Oil & Gas metrics
Multiple effective dates
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Reserves & resources — detail
As at 30 September 2025
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