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Statistical Methods for Estimating Petroleum Resources$
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P.J. Lee and Jo Anne DeGraffenreid

Print publication date: 2008

Print ISBN-13: 9780195331905

Published to Oxford Scholarship Online: November 2020

DOI: 10.1093/oso/9780195331905.001.0001

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Other Assessment Methods-An Overview

Other Assessment Methods-An Overview

(p.152) 7 Other Assessment Methods-An Overview
Statistical Methods for Estimating Petroleum Resources

P.J. Lee

, Jo Anne DeGraffenreid
Oxford University Press

Resource evaluation procedures have evolved along distinct paths, involving a variety of statistical, geochemical, and geological approaches because of different types of data and various assumptions that have driven their development. Many methods have been developed so far, but only those methods that have been published and have significantly influenced subsequent development of evaluation procedures are discussed here. The purpose of this chapter is to present an overview of the principles of these methods and identify the direction of future research in this area. Methods discussed include the following: • Geological approach-volumetric yield by analogy, basin classification • Geochemical approach-petroleum systems, burial and thermal history • Statistical approach (methods that were not discussed in previous chapters are discussed here) • Finite population methods-Arps and Roberts’, Bickel’s, Kaufman’s anchored, and Chen and Sinding-Larsen’s geoanchored • Superpopulation methods-USGS log-geometric, Zipf’s law, creaming, and Long’s • The regression method • The fractal method Specific data and assumptions can be applied to each of these methods. Some of the assumptions can be validated by the data whereas others cannot. These methods have their own merits and disadvantages. The geological approach has been used for the past several decades and is a qualitative method. This section discusses the volumetric yield method and the basin classification method. Volumetric yield using the analogous basin method was the earliest method of petroleum resource evaluation applied to frontier basins. It requires knowledge of the volume of a basin and its characteristics (e.g., tectonic, sedimentation, thermal generation, migration, and accumulation). Based on comparative studies, geologists are able to apply a hydrocarbon yield factor per unit volume (i.e., barrels of oil/cubic unit of sediment) from one known basin to an unknown basin with similar characteristics. Thus, for conceptual basins, this provides some information about the richness of an unknown basin. The advantages are the following: 1. It is suitable for the evaluation of conceptual basins. 2. It is easy to understand. 3. It combines geochemical data and/or experience from mature basins.

Keywords:   basin, comparative studies, deposition|economic analysis, field-size distribution, geochemical studies, hydrocarbon, lithology, lognormal distribution, map

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