Fluid transport and pore accessibility in the Early Carboniferous Laurel Formation, Canning Basin, Australia
We propose to investigate the pore size dependent accessibility, adsorption and desorption of geological fluids in Paleozoic sedimentary rocks from the Canning Basin using SANS and USANS. We will employ contrast matching with CD4 and CO2 fluids pressurised up to 650 bar. The rock samples were either sliced off from solid cores or selected from cuttings samples at various depths in three wells that span the length of the Fitzroy Trough, a Paleozoic depocentre that hosts conventional hydrocarbon accumulations of Devonian and Carboniferous age. Selected samples were characterised using standard geochemical methods and contain small amounts of organic matter that are thermally mature and within either the oil or gas window. The pore space topology of such rocks is often fractal on the linear scale from nanometers to tens of micrometers. It is a surprising result of only few previous experiments that a significant fraction of pores may not be accessible to invading fluids, with no obvious trend with the pore size. Also, there are indications that in the smallest of nano-pores the adsorption mechanism is pore size dependent and dominated by the condensation phenomena.
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RADLINSKI Andrzej; BLACH Tomasz; JENTSCHEL Michael; LEMMEL Hartmut; RAUCH Helmut; Klaus Regenauer-Lieb and SCHWEINS Ralf. (2018). Fluid transport and pore accessibility in the Early Carboniferous Laurel Formation, Canning Basin, Australia. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-04-97
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