Pore structures and petroleum reservoir characteristics of Arkosic sandstones, with consideration of the tectonic context of diagenesis: Examples from Pennsylvania and West Siberia

The aim of this investigation is to determine the nature and causes of variation in petroleum reservoir quality in two arkosic sandstone units that both contain significant secondary porosity resulting from feldspar dissolution. The study is based on core samples from the Upper Devonian reservoir of the Kane field in the Appalachian Basin of Pennsylvania and the Lower Cretaceous BS;Permeability in the Kane field reservoir is controlled by a single pore type that was created largely by dissolution of feldspars. Secondary pores of this type are concentrated in laminae and are connected by such large throats that the pore system has fracture-like flow characteristics. The dissolution laminae probably represent "packing flaws", formed at or immediately after deposition, that provided pathways for corrosive pore fluids. Depositional controls on feldspar dissolution are also important in the BS;The Kane field and BS...