Methane-rich gas emissions from natural geologic seeps can be chemically distinguished from anthropogenic leaks

TRRP Training: 2022 Program

presented by: GSI Environmetal Inc.

Texas Risk Reduction Program regulations (TRRP; 30 TAC 350) establish consistent risk-based protocols for assessment and response to soil, groundwater, or surface water impacts associated with environmental releases of regulated wastes or substances.

Presented by GSI Environmental Inc., this popular and informative training series is a must for professionals who need a working understanding of TRRP and those needing to stay up-to-date with the latest TCEQ TRRP guidance and policies.

TRRP Training Course (2 Days): Provides an overview of the TRRP framework and step-by-step training on property assessment and response action procedures established under the TRRP rule

Attendees will become acquainted with rules, key guidance and policies covering affected property assessments, protective concentration levels, and response actions. The course material presents strategies for efficient project management in compliance with TRRP and explains the various report forms adopted by TCEQ.

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Texas Association of Environmental Professionals (TAEP) TAEP is the premier organization for environmental professionals in the State of Texas. The goals of TAEP include the advancement of the environmental profession and the establishment of a forum to discuss important environmental issues. TAEP members receive a 10% discount. Please call 713.522.6300 for the code.

Dates and Location

Dates

June 14th and 15th, 2022

Location

Crowne Plaza River Oaks 2712 SW Freeway Houston, Texas 77098 713.523.8448 http://www.crowneplaza.com/

Price and Registration

Early-Bird Price

(Paid by May 1, 2022)
$XXX

Standard Price

(Paid after May 1, 2022)
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TAEP Membership Price

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Government Price

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Lodging and meals are not
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Published: 2025

Authors: Lisa J. Molofsky, Giuseppe Etiope, Daniel C. Segal, Mark A. Engle 

Abstract

Fossil methane, a key component of the atmospheric greenhouse gas budget, is emitted by fugitive leaks from petroleum industry activities and natural geologic seepage. Since the gas from these two sources can exhibit similar isotopic compositions, differentiating them using atmospheric observations is often challenging. Here, we provide a conceptual model that helps distinguish the two sources. Using molecular and isotopic data from global seep and reservoir gas inventories, and new seep analyses from major hydrocarbon-bearing basins in California, we identify six post-genetic changes in gas chemistry. These changes include alterations of molecular ratios among alkanes (ethane, propane, and butane) and 13C enrichment of propane and carbon dioxide due to oxidation and secondary methanogenesis. Such changes are typical of seepage, and do not occur in deep reservoir gas that may leak during extraction and transport. Our model can aid in source attribution of fossil gas analyzed in airborne or field surveys and serve as a foundation for future work on regional emissions of natural gas.