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Coalbed Reservoir Gas-In-Place Analysis

SKU: GRI-97/0263
Coalbed Reservoir Gas-In-Place Analysis

This is a technical reference of procedures used for determining the gas-in-place volume of coalbed reservoirs. Gas-in-place is the volume of gas stored within a specific bulk reservoir rock volume. Accurate gas-in-place analysis is crucial to reliably evaluating coalbed gas exploration prospects, forecasting the gas production rates of coalbed reservoirs, and evaluating the potential severity of natural gas emissions during coal mining operations.
Document Type
Report Type
Topical Report
Report Period
Gas Research Institute
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PDF Download
$295.00 / Each
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Coalbed reservoir gas-in-place analysis is a very complex process. Four physical reservoir parameters are needed to calculate the gas-in-place volume: reservoir or well drainage area; gross reservoir rock thickness (consisting of both coal and other organic-bearing rock types); average reservoir rock density; and average in-situ gas content. Accurately determining these four reservoir parameters presents numerous data collection and analysis challenges. Most of the methods commonly used for determining these reservoir parameters have inherent shortcomings that significantly affect the accuracy and comparability of gas-in-place analysis results. Three major sources of gas-in-place error are underestimation of the gross reservoir thickness, average reservoir rock density, and average in-situ gas content.

The emphasis in this report is on providing practical information, guidelines, and procedures for analyzing coalbed reservoir data. We have included insights into sources of error and the comparative accuracy of commonly used analysis procedures rather than lengthy technical explanations of the theories behind these procedures. Example problems and exercises are given throughout the text to promote understanding of the analysis procedures and to facilitate independent, self-paced training by practicing petroleum geologists and reservoir engineers. The text in each chapter is supplemented by references identifying literature sources containing additional information. Specifically, this book will help you to:

  • Approach your specific analysis problems more systematically and effectively.
  • Improve your ability to account for variations in sample composition and gas content.
  • Understand the major sources of errors in gas-in-place estimates.
  • Understand the comparative accuracy of commonly used analysis procedures.
  • Understand the value added by using best practice analysis procedures.

The information in this book represents the accumulated knowledge and expertise of specialists from many disciplines. Most of this information is the product of more than a decade of basic coal science and field-based coalbed reservoir engineering research sponsored by the Gas Research Institute. The new data, technical insights, guidelines, and procedures that resulted from this research can help you to more reliably evaluate the development potential of coalbed gas reservoir prospects and to optimize the recovery and economics of existing coalbed gas production operations. Several coalbed gas producers and service laboratories have independently evaluated and documented the applicability and practical value of these guidelines in basins throughout the United States and other countries throughout the world. In short, the information in this report can help you make better informed decisions about developing this important natural gas resource.
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