oa Formation Evaluation in Tight Gas Reservoirs

Tight gas reservoirs have been defined as any reservoir having permeability less than 0.1mD or a reservoir that will not produce commercially without stimulation. A tight gas reservoir is more difficult to evaluate. In order to completely evaluate and characterize these reservoirs to enable a successful and commercial development a more extensive set of data is required. Formation evaluation of these reservoirs consists of five components: lithology(mineralogy), texture, depositional environment, present day stress, and tectonic history (fracture types and orientation). The successful integration of these geological, petrophysical, and geo-mechanical disciplines is necessary in order to evaluate these reservoirs.