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Type: Journal article
Title: Feldspar dissolution-enhanced porosity in Paleoproterozoic shale reservoir facies from the Barney Creek Formation (McArthur Basin, Australia)
Author: Baruch, E.
Kennedy, M.
Löhr, S.
Dewhurst, D.
Citation: AAPG Bulletin, 2015; 99(9):1745-1770
Publisher: American Association of Petroleum Geologists
Issue Date: 2015
ISSN: 0149-1423
Statement of
Elizabeth T. Baruch, Martin J. Kennedy, Stefan C. Löhr, and David N. Dewhurst
Abstract: The Paleoproterozoic Barney Creek Formation (BCF; McArthur Basin, Australia) is one of the oldest active hydrocarbon systems on Earth with oil and gas shows present within organic-rich intervals (up to 7 wt. % total organic carbon). We combine bulk geochemical analyses, pore-space characterization, and highresolution electron imaging techniques to characterize the evolution of the BCF pore system with maturity. A thermal gradient from the pre-oil window (0.48% calc. Rₒ) to gas window (1.01% calc. Rₒ) shows a progressive change in pore networks with the loss of organic-hosted pores dominant in thermally immature samples to porosity increasingly associated with the mineral matrix with thermal maturity. Precipitation of fine-grained, high surface area cements reduced porosity within the oil window, whereas feldspar and dolomite dissolution and creation of secondary pores increased porosity within the gas window. The abundance of feldspar grains (up to 50%) provided a significant potential for secondary pore formation as well as a source of silica and clay cement. This study identifies a first-order linkage between the chemically reactive sediments that are key to the reservoir properties in the BCF and a provenance and/or weathering intensity conducive to supplying fine-grained, mineralogically immature sediments during deposition. These findings likely apply more broadly to other chemically immature mudrocks typical of Precambrian age sediments or Phanerozoic settings subject to limited chemical weathering.
Rights: Copyright © 2015. The American Association of Petroleum Geologists. All rights reserved.
RMID: 0030038396
DOI: 10.1306/04061514181
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Appears in Collections:Geology & Geophysics publications

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