The article compares different ways to evaluate investments in oil and gas fields in China, Canada, and Russia. Traditional methods focus on financial aspects, but a new method called energy return on investment (EROI) considers energy production costs, environmental impact, and efficiency. By combining the strengths of various assessment methods, a more comprehensive approach can be created. This new method can help oil and gas companies make better decisions about their investments and improve efficiency. Future research could involve comparing EROI in different countries and enhancing corporate reporting on energy return on investment.