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The AAPG/Datapages Combined Publications Database

AAPG Special Volumes

Abstract


Pub. Id: A066 (1986)

First Page: 9

Last Page: 43

Book Title: SG 24: Geology of Tight Gas Reservoirs

Article/Chapter: Comparisons of Upper Devonian and Lower Silurian Tight Formations in Pennsylvania--Geological and Engineering Characteristics

Subject Group: Reservoirs--Sandstones and Carbonates

Spec. Pub. Type: Studies in Geology

Pub. Year: 1986

Author(s): Christopher D. Laughrey, John A. Harper

Abstract:

Most Upper Devonian and Lower Silurian reservoirs in Pennsylvania have stratigraphic traps (pinch-outs, porosity changes, etc.), but the occurrence of extensive fault and fracture trends throughout western Pennsylvania probably influenced the migration of fluids and the diagenesis of sediments. Reservoirs comprise a variety of quartzose, lithic, and feldspathic 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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