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Abstract

Summary

The Namurian Chokier Formation of late Mississippian has been studied in two shallow boreholes in southern Belgium which addresses to its shale gas potential. To help with the global assessment of this shale gas succession, the research focuses on the detailed characterization of the Chokier mudstones in Belgium which distribute in the Campine Basin and Wallonian Basin. After the description of cores and quarries from 6 sampling locations, the samples have been analysed with X-ray diffraction (XRD), microscopy, cold cathodoluminescence for petrographical and mineralogical study. It reveals that Chokier Formation is composed of successive mudstones in the Campine Basin while mudstones with more interbedded sandstones in the Wallonian Basin. The mudstones consist of the mixture of clay minerals (including kaolinite, illite, chlorite), quartz, feldspars, mica (including muscovite, biotite, phlogopite), carbonates (including calcite, dolomite, siderite, ankerite), sulfides (mainly pyrite), organic matter and amorphous material. In consideration of variable sedimentary structures and relative proportions of clay minerals, carbonates, quartz, feldspar and mica, 3 lithologies and 8 lithofacies have been classified in the Chokier mudstones. The deposition setting of Chokier Formation changes from marine, prodelta to delta front from the Campine Basin in northern Belgium to the Wallonian Basin in southern Belgium.

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/content/papers/10.3997/2214-4609.201900273
2019-04-28
2024-04-25
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