Open-File Report 2012–1146
IntroductionThe U.S. Geological Survey (USGS) periodically assesses petroleum resources of areas within the United States and the world. The purpose of this report is to explain the development of an analytic probabilistic method and spreadsheet software system called Analytic Cell-Based Continuous Energy Spreadsheet System (ACCESS). The ACCESS method is based upon mathematical equations derived from probability theory. The ACCESS spreadsheet can be used to calculate estimates of the undeveloped oil, gas, and NGL (natural gas liquids) resources in a continuous-type assessment unit. An assessment unit is a mappable volume of rock in a total petroleum system. In this report, the geologic assessment model is defined first, the analytic probabilistic method is described second, and the spreadsheet ACCESS is described third. In this revised version of Open-File Report 00–044 , the text has been updated to reflect modifications that were made to the ACCESS program. Two versions of the program are added as appendixes. |
First posted August 7, 2012 For additional information contact: Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge. |
Crovelli, R.A., 2012, Analytical resource assessment method for continuous (unconventional) oil and gas accumulations—The “ACCESS" Method: U.S. Geological Survey Open-File Report 2012–1146, 32 p. [Revised by Charpentier, R.R.]
Introduction
Geologic Assessment Model
Analytic Probabilistic Method
Spreadsheet System
Acknowledgments
References Cited