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This text covers all of the subjects necessary to evaluate oil and gas properties. Subjects include decline curve evaluation using both Arps' equations and more recent equations, and net cash flow calculations in a royalty/tax system and a production sharing contract. Time value of money and managerial indicators are also discussed. Resource and reserve definitions under PRMS and SEC systems including a compilation of the 1978 and 2008 SEC definitions. Oil and gas pricing is discussed including an example on calculating the revenue from a POP contract. Examples of AFE's for horizontal and vertical wells are provided along with lease operating statements. Methods of handling uncertainty are covered including sensitivity analysis, expected value tables, decision trees, and Monte Carlo simulation. There is a chapter on U.S. Federal Income Tax as applied to both IPRO and integrated oil companies. Land concepts are discussed and a technique for determining working interest and net revenue interest in complex deals is presented. One chapter covers the three styles of report - letter, formal, and oral - with specific suggestions for the report content and example reports.
Published accounts of the valuation of oil properties have been concerned chiefly with the important element of the oil and gas contents of lands. Less attention has been given to those other influences which affect the value of the oil and gas, to the various valuation methods appropriate to different circumstances, and to the forms in which oil properties occur. The aim here is to help close that gap, especially for the younger engineers, with a review of the meaning and scope of valuation in the oil business, the factors which enter a valuation, and the methods of applying these. Questions which arise in valuation practice and the avenues of solution are discussed rather than efforts, in these days of rapid changes, to provide specific answers and detailed lists of equipment costs.