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Abstract

In recent years, oil and gas accumulation-size frequency distributions have become a standard way to characterize undiscovered conventional oil and gas resources that have been postulated by geologic assessments. The preparation of such distributions requires the assessment geologists to explicitly choose parameters for the probability distribution for the sizes of undiscovered accumulations. The purpose of this report is to present a computational scheme for obtaining a binned size frequency distribution of undiscovered accumulations when the undiscovered accumulation size distribution is shifted truncated lognormal.

For additional information on Open-File Report 2007-1260, please contact the author.

Contents

• Abstract
• Acknowledgments
• Introduction
• Shifted Trundated Lognormal Accumulation-Size Distribution
• Size Frequency Distribution and Expected Volume of Resources in Undisovered Accumulations
• Using the Fortran Program
• Using the Microsoft Excel Programs
      Workbook Lognormal.xls
      Workbook lognormal_EUR.xls
• References Cited
• Appendix 1. Conventional Accumulation-Size Class Definitions
• Appendix 2. Continuous Cell-Size Class Definitions
• Appendix 3. Fortran Program Listing
• Figures
• Conversion Factors