Chapter 3

Important Features of Unconventional Gas


Unconventional gas reservoirs are loosely defined as those that cannot be produced with conventional techniques. It turns out that the volume of gas available increases exponentially as one moves from conventional gas to Coalbed methane, then to tight sand and shale gas, and then finally to gas hydrate deposits. For instance, gas hydrate volume is hundreds of times greater in methane volume than other sources of methane. At the same time, the quality as well as environmental integrity is also higher with more abundant gas resources. In this chapter, the most important features of gas with geological background are presented. This is followed with the process that is involved in forming ...

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