Indicators of hot fluid migration in sedimentary basins: evidence from the UK Atlantic Margin

Wycherley, H. L.; Parnell, John; Watt, G. R.; Chen, H.; Boyce, Adrian J.

doi:10.1144/1354-079303-569

Cited by 21 publications

(28 citation statements)

References 34 publications

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“…In well 206/5-2, once again the highest fluid inclusion temperatures are recorded in the Cenozoic section (Wycherley et al 2003) and, as in well 204/19-1, the high temperatures of the Cenozoic section are recorded in the oil inclusions, emphasizing a relationship between oil and hot fluid.…”

Section: Resultsmentioning

confidence: 76%

“…Fluid inclusion homogenization temperature data, previously reported by Wycherley et al (2003), were recorded from 12 , md). Most of the palaeotemperatures from the reflectance data plot slightly above the present-day temperature profile, defining a generally linear profile suggesting that the preMiocene section has been hotter in the past, with deeper burial providing the most likely explanation of the heating.…”

Section: Resultsmentioning

confidence: 99%

“…Data are also available for the Cretaceous and Cenozoic sections in well 214/29-1 (Wycherley et al 2003), where anomalously high fluid inclusion temperatures were similarly encountered in the Cenozoic section but not in the Cretaceous section. In well 206/5-2, once again the highest fluid inclusion temperatures are recorded in the Cenozoic section (Wycherley et al 2003) and, as in well 204/19-1, the high temperatures of the Cenozoic section are recorded in the oil inclusions, emphasizing a relationship between oil and hot fluid.…”

Section: Resultsmentioning

confidence: 99%

“…Zoned and unzoned cement morphologies can be discriminated easily using scanning electron microscopy cathodoluminescence (SEM-CL). There is a marked distinction in SEM-CL characteristics between quartz cements from preCenozoic and Cenozoic sandstones in the West of Shetland region, recorded from a number of wells by Wycherley et al (2003). This is also evident in samples from the Cretaceous and Paleocene of 204/19-1 (Fig.…”

Section: Host Cementsmentioning

confidence: 87%

“…The fluid inclusion data from these three wells have been presented by Wycherley et al (2003), while apatite fission track and vitrinite reflectance data are available primarily from the 204/19-1 well.…”

Section: Introductionmentioning

confidence: 99%

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Thermal history and oil charge on the UK Atlantic margin

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Integrated apatite fission track analysis and vitrinite reflectance data show that well 204/19-1 in the West of Shetland region, UK Atlantic margin, has experienced only limited additional burial beyond present-day depths. Uplift and cooling to present-day levels probably occurred during late Cenozoic (Eocene to Miocene) basin inversion. Fluid inclusion data indicate that Paleocene-Eocene sandstones have experienced temperatures much higher than can be explained by burial alone. Temperatures up to 200 C indicate the passage of hot fluid through Cenozoic sandstones, which by-passed the pre-Cenozoic section in this and other wells. The hot fluid event must have been of very brief duration (up to 100 years) to show no record in the fission track and reflectance data, implying that the fluids migrated through fracture systems.Oil inclusions in the Cretaceous of well 204/19-1 have a chemistry that suggests derivation from a Kimmeridgian-aged source rock. They occur in cements that show no evidence for the hot fluid event and it is concluded that the cements pre-date the event. Oil inclusions in Cenozoic sandstones have a heavy, degraded character and were trapped at high temperature, suggesting that degradation was related to the hot fluid event. Present-day oils in the West of Shetland region are mixtures, which could reflect components from the two charges distinguished by the integrated thermal and geochemical histories. The inference of fracture-bound flow is consistent with existing models of overpressure development and hydrofracturing.

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Section: Resultsmentioning

confidence: 76%

Section: Resultsmentioning

confidence: 99%