UNCONVENTIONAL GAS-2: Resource potential estimates likely to change

Understanding of the unconventional-gas resource base has improved in the past decade, but many unknowns remain.Data from drilling more than 100,000 wells and developing 120 tcf of reserves in the past 10 years have provided a more solid foundation for estimating the resource potential of tight gas sands, coalbed methane, and gas shales.Yet questions remain, such as: Where are the productive limits of the emerging gas plays? What is the optimum well spacing? How will advances in well drilling and completion technologies change well productivity?Because of these questions, estimates of the recoverable portion of the large in-place unconventional-gas resource may change many times during th...

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