FLUID TRANSPORT AND PORE ACCESSIBILITY IN PROTEROZOIC AND EARLY PALEOZOIC SHALES
We propose to investigate the pore size dependent adsorption and desorption of geological fluids in several Paleozoic and Proterozoic sedimentary rocks using SANS and USANS. The rock samples were sliced off a solid core extracted from various depths in three geologically old Australian basins. Selected samples were characterised using standard geochemical methods and contain small amounts of organic matter of various thermal maturity. The pore space topology of such rocks is often fractal on the linear scale from nanometers to tens of micrometers. As a surprising result of only few previous experiments similar to the one proposed here, it transpired 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. We propose to systematically investigate the sorption mechanisms and pore accessibility in a carefully selected set of rock samples across the entire pore size range (1 nm to 20 microns), using the contrast matching technique with pressurized CD4 and CO2 fluids
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RAUCH Helmut; BLACH Tomasz; LEMMEL Hartmut; LINDNER Peter and RADLINSKI Andrzej. (2014). FLUID TRANSPORT AND PORE ACCESSIBILITY IN PROTEROZOIC AND EARLY PALEOZOIC SHALES. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-10-1394
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