High pressure methane sorption characteristics of lacustrine shales from the Midland Valley Basin, Scotland

摘要: Abstract Three different oil shales of lacustrine origin from the Midland Valley, Scotland were investigated to assess their methane sorption capacity, influence pre-adsorbed water on as well contribution individual constituents (minerals and organic matter) characteristics. Measurements conducted using a manometric device. In total, 15 isotherms measured at 318 K (45 °C) 5 moisture states (dry, equilibrated 11, 33, 53 97% relative humidity) set samples in light oil/wet gas maturity zone (3, 8, 21% TOC). Water uptake behaviour during equilibration is controlled by total clay content whereas capacity (0.015–0.18 mmol/g) TOC. Pre-adsorbed significantly decreases non-linear manner until critical 0.5–0.7 mmol water/g reached. The impact strongly TOC content, with having strong clays little early mature, kerogen type I matter. Our results are consistent previous findings matter interaction minerals observed marine source rocks. Shale potential West Lothian Oil-Shale Formation was critically evaluated basis recent reservoir estimation British Geological Survey. these show three times lower capacities comparison matter, but more data needed effects have be taken into account future studies.