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Article | REF: BE8557 V1

Non-conventional gases

Authors: Didier FAVREAU, Thierry ROUAUD

Publication date: April 10, 2012

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ABSTRACT

Despite forecasts, gas production in the United States has not decreased during the last few years. One of the reasons for its steady progression is the use of so-called unconventional resources. These deposits, which are essentially composed of methane, are opposed to conventional resources essentially due to their formation and exploitation mode. Shale gas, tight gas reservoirs, coal gas, gas hydrates, all these different resources have been the subject of significant technological and productivity efforts. However, they present major differences due to their origin, characteristics and therefore so do the environmental aspects of their production.

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 INTRODUCTION

Gas production in the United States has been growing steadily since 2005, even though it had been recognized for some ten years that domestic resources were running out. This has been made possible by massive access to so-called unconventional resources, mainly shale gas, at costs reduced by the use of new technologies and major productivity efforts. The search for and exploitation of unconventional gas is underway in many other countries. In this dossier, we offer a brief review of the different types of unconventional gas: their origin and characteristics, their production methods and the environmental aspects of this production. It also summarizes current estimates of technically recoverable unconventional gas resources.

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