Abstract
The Elmworth gas field is situated in the deep part of the Western Canada Basin (“Deep Basin”). Almost the entire Mesozoic sedimentary sequence in this area is gas-saturated and represents a typical low-porosity, low-permeability gas accumulation of major importance. Various aspects of the geochemistry of light hydrocarbons are studied in a series of about 200 type III kerogen and coal-bearing rock samples (cuttings) from two exploration wells in the Elmworth area, comprising a sedimentary sequence of Cretaceous to Mississippian age. Based on a combined “hydrogen-stripping”- thermovaporization/capillary gas chromatography technique the concentrations of the C 2–C 8 hydrocarbons are determined. Concentrations and compositional details are discussed in terms of light hydrocarbon generation including possible migration phenomena. Both the relative cyclopentane content and the concentration ratio of the 1,2-dimethylcyclopentane stereoisomers can clearly be correlated with the vitrinite reflectance data in the two wells.
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