Dinantian


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Dinantian

[di′nan·chən]
(geology)
Lower Carboniferous geologic time. Also known as Avonian.
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During drilling elevated gas readings were recorded from the Westphalian and below this over the total 157 metre Dinantian Limestone interval (Dinantian) along with the presence of oil shows (pale white blue cut fluorescence) in both Westphalian and Dinantian cuttings samples.
Since reporting the initial well results, further detailed technical analyses of the data from the Biscathorpe-2 well have been undertaken, including an updated petrophysical evaluation by both Egdon and Union Jacks petrophysical consultants which focussed specifically on the Dinantian. These petrophysical analyses indicated hydrocarbon saturations of greater than 50% within the upper parts of the Dinantian.
Union Jack, Montrose Industries Limited, and Egdon Resources plc, also appointed independent geotechnical consultants, Applied Petroleum Technology (UK) Limited (APT), to perform a detailed geochemical analysis of drill cutting samples taken from 20 intervals in the Biscathorpe-2 well, comprising five from the Westphalian and 15 from the Dinantian. The objective of the APT analysis was to provide geochemical evidence for the presence of live hydrocarbons together with an estimate of the likely oil quality (the APT Report).
The APT Report has confirmed the occurrence of hydrocarbons in the Westphalian and Dinantian cutting samples analysed from the Biscathorpe-2 well.
In February, Egdon said it found "elevated" gas readings in the well from the Westphalian and Dinantian intervals, as well as oil shows.
Further analysis has shown hydrocarbon saturations of over 50% in the upper parts of the Dinantian, as well as the occurrence of hydrocarbons from some cutting samples from both the Dinantian and Westphalian levels.
The data supports "the existence of a significant column of good quality oil" in the Dinantian, with the full suite of gases found.
Ostracode stratigraphy of the Ardenno-Rhenish Devonian and Dinantian. In International Symposium on Namur 1974, Belgian Micropaleontological Limits from Emsian to Visean, pp.
(1991): Environmental gradients in carbonate sediments and Rocks detected by correspondence analysis: examples from the Recent of Norway and the Dinantian of southwest England.
and Wyse Jackson, P.N., 2001, Carboniferous (Dinantian), in C.H.
Palaeobiological and phylogenetic implications of anatomically-preserved Archaeocalamites from the Dinantian of Oxroad Bay and Loch Humphrey Bum, Scotland.
The well encountered coal measures at expected depths, while successfully intersecting the secondary target of the Dinantian limestone to calibrate the seismic data .