Reserves estimation in tight gas reservoirs

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The resource triangle, Figure 1, describes the distribution of original gas in place (OGIP) in a typical basin.[1] At the top of the triangle are the high permeability reservoirs. These reservoirs are small, and, once discovered, as much as 80 to 90% of the OGIP can be produced using conventional drilling and completion methods. As we go deeper into the resource triangle, the permeability decreases, but the size of the resource increases. Higher gas prices and better technology are required to produce significant volumes of gas from these tight gas reservoirs. The recovery efficiency is computed by dividing the cumulative gas produced by the OGIP volume.

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