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Petroleum Reserves Consulting, Since 1961

LEARN MORE ABOUT CG&A

Petroleum Reserves Consulting

Cawley, Gillespie and Associates, Inc.

Petroleum Reserves Consultants, Gillespie and Associates, Inc. (CG&A) began serving the oil and gas industry over 60 years ago. Though our methods and tools have evolved since that time, our values have not. We still provide ethical and independent petroleum reserves engineering services. Our extremely capable team of professional petroleum engineering consultants have broad range of experience and capabilities to serve all your petroleum consulting needs. You deserve responsive engineers and geologists delivering reliable property evaluations… on time!

Putting our clients first, since 1961

As a Petroleum Reserves Consulting firm, CG&A reviews and evaluates hundreds of thousands of oil and gas properties on an annual basis worth billions of dollars. Our clients include oil and gas companies, financial institutions, midstream/pipeline companies and individual investors. With diversified experience in oil and gas producing properties throughout North America and around the globe, CG&A’s proficient team of petroleum engineering consultants, reservoir engineers and geologists integrate geological, geophysical, engineering and economic data to produce high-quality reserve estimates and economic forecasts.

  • Office locations in Fort Worth, Houston, and Austin, Texas, USA
  • 30+ Petroleum Engineering Consultants, Geologists and Technical Analysts
  • Worldwide producing basin experience, unconventional and conventional
  • Approved by all major banks, key regional banks, and private equity firms
  • Deep experience with SEC, SPE-PRMS and COGEH guidelines and reporting

Our Services

CG&A’s talented staff of Petroleum Reserves Consultants, Geologists, Technical Analysts, Economists, and Software Developers is here for all of your oil and gas property evaluation needs.

  • Texas Professional Engineering Firm (F-693)
  • Ability to pool resources from each office to prepare the best team for your project
  • Access to third-party experts and services for special projects
  • Deep experience in SEC, SPE-PRMS and COGEH reporting
  • Direct relationship with key SEC auditors
  • Regularly attend data rooms and assist clients with acquisitions and/or divestitures
  • Approached by all major banks, key regional banks, and private equity firms
  • Oil and Gas Reserves Evaluation
  • Oil and Gas Reserves Reporting
Engineering

Estimation of petroleum reserves and resources

Geoscience

Analyzing wireline logs, mud & drilling logs, cores & core data

Economics

Economic evaluation of petroleum properties

Resource Studies

CG&A regularly prepares volume-oriented field studies and basin analyses for investors and midstream clients

Oil and Gas Reserve Reporting

Classifying and quantifying reserves & resources, and determining associated net present value.

Petroleum Reserves Consulting Blog

December 5, 2025 in Oil & Gas Consulting

CG&A Partner Rob Bergeron Joins Texas Alliance of Energy Producers Board

CG&A congratulates Rob Bergeron, Partner and Senior Engineer on his appointment to the Board of Directors for the Texas Alliance of Energy Producers. Rob’s technical experience and commitment to responsible…
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November 15, 2025 in Oil & Gas Consulting

Kellie Jordan Named to Hart Energy’s 2026 Influential Women in Energy

It gives us tremendous pride and joy to share that our very own Kellie Jordan has been selected by Hart Energy as one of its 2026 Influential Women in Energy honorees, a well-deserved recognition that celebrates the…
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January 8, 2025 in Oil & Gas Consulting

Todd Brooker Elected to the SPEE 2025 Board of Directors

CG&A is thrilled to announce the election of Todd Brooker to the SPEE 2025 Board of Directors! We are so proud of Todd for his outstanding leadership, not only within…
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