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Probabilistic Evaluation of Global Technically Recoverable Tight Gas Resources

Fig. 2—Comparison of the probabilistic distributions of OGIP per section (640 acres) for Lance, Cotton Valley, and Travis Peak formations.

There are no reliable estimates of technically recoverable resources (TRRs) for unconventional reservoirs outside North America, and many countries lack the advanced technology such as horizontal drilling and hydraulic fracturing necessary to develop unconventional resources. To encourage investment in these technologies, new resources estimates are needed. The objective of this study was to develop a methodology and software for probabilistic resource estimation and to use this new technology to estimate global technically recoverable gas resources in tight sands.

Introduction

In this paper, tight gas is gas that is present in low-permeability sandstone or limestone formations. In the US, tight gas reservoirs are generally defined as having less than 0.1-md permeability. To produce gas at economic rates from reservoir rocks with such low permeability, massive hydraulic fracturing is necessary.

Petroleum Resources Management System (PRMS). The terms “resources” and “reserves” have been and continue to be used to represent various categories of mineral or hydrocarbon deposits. In March 2007, SPE, the American Association of Petroleum Geologists, the World Petroleum Council, and the Society of Petroleum Evaluation Engineers jointly published the PRMS to provide an international standard for classification of oil and gas reserves and resources. It is important to remember that the broadest categories are also the least precise. As one moves toward the categories at the bottom of the PRMS, the associated estimates of the amount of natural gas in those categories become more and more uncertain. However, technically and economically recoverable resources are not formally classified in the system.

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 165704, “Probabilistic Evaluation of Global Technically Recoverable Tight Gas Resources,” by Zhenzhen Dong, SPE, Schlumberger, and Stephen A. Holditch, SPE, and Walter B. Ayers, SPE, Texas A&M University, prepared for the 2013 SPE Eastern Regional Meeting, Pittsburgh, Pennsylvania, USA, 20–22 August. The paper has not been peer reviewed.
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Probabilistic Evaluation of Global Technically Recoverable Tight Gas Resources

01 October 2014

Volume: 66 | Issue: 10

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