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Most Upper Devonian and Lower Silurian reservoirs in Pennsylvania have stratigraphic traps (pinch-outs, porosityture trends throughout western Pennsylvania probably influenced the migration of fluids and the diagenesis of sediments. Reservoirs comprise a variety of quartzose, lithic, and feld- spathic sandstones whose diagenetic histories included formation of authigenic clays, cementation, dolomitization, solution of cements and grains (resulting in secondary porosity development), and recementation. Permeabilities and porosities (most of which are secondary) tend to be low.

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