30 CFR § 250.121 - What happens when the reservoir contains both original gas in place and injected gas?

---
identifier: "/us/cfr/t30/s250.121"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "30 CFR § 250.121 - What happens when the reservoir contains both original gas in place and injected gas?"
title_number: 30
title_name: "Mineral Resources"
section_number: "250.121"
section_name: "What happens when the reservoir contains both original gas in place and injected gas?"
chapter_name: "BUREAU OF SAFETY AND ENVIRONMENTAL ENFORCEMENT, DEPARTMENT OF THE INTERIOR"
subchapter_number: "B"
subchapter_name: "OFFSHORE"
part_number: "250"
part_name: "OIL AND GAS AND SULPHUR OPERATIONS IN THE OUTER CONTINENTAL SHELF"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "30 U.S.C. 1751, 31 U.S.C. 9701, 33 U.S.C. 1321(j)(1)(C), 43 U.S.C. 1334."
regulatory_source: "76 FR 64462, Oct. 18, 2011, unless otherwise noted."
cfr_part: "250"
---


# 250.121 What happens when the reservoir contains both original gas in place and injected gas?

If the reservoir contains both original gas in place and injected gas, when you produce gas from the reservoir you must use a BSEE-approved formula to determine the amounts of injected or stored gas and gas original to the reservoir.