Table 2. 

Thermal history interpretation summary of AFTA and VR data in two Inner Moray Firth wells

Sample number GC237-Depth (m)Stratigraphic details*Present temperature (°C)Default VR/AFTA parameters†Measured VR‡ (%)Maximum palaeotemperature§ (°C)Onset of cooling from AFTA (Ma)
Well 12/23-1
236Middle Barremian110.270.30<50
(130–128 Ma)
312Lower Barremian130.270.29<50
(131–130 Ma)
543Lower Barremian–Hauterivian190.280.28<50
(133–131 Ma)
776Lower Valanginian260.280.3350
(141–138 Ma)
792Upper–Middle Volgian270.280.28<50
(150–146 Ma)
808Middle Volgian270.290.31<50
(152–150 Ma)
823Middle Volgian280.290.30<50
(152–150 Ma)
853Upper–Middle Oxfordian290.300.3250
(156–155 Ma)
27869–905Middle–Lower Oxfordian30150 Ma65–85100–15
(157–156 Ma)14.2 μm
281225–1356Upper Permian–Triassic42221 Ma75–95100–15
(256–208 Ma)13.6 μm
291676–1813Lower Permian55231 Ma80–105190–10
(290–256 Ma)12.9 μm
1897Lower Permian600.450.5592
(290-256 Ma)
302565–2566Devonian80229 Ma>100120–40
(408-363 Ma)9.9 μm
Well 12/24-2
552676–2685Lower Volgian9037 Ma<110Post-deposition
(152–150 Ma)10.1 μm
2681Lower Volgian900.630.5069
(152–150 Ma)(30)
2856Kimmeridgian960.660.5578
(155–152 Ma)(27)
3136Upper–Middle Oxfordian1050.730.6795
(156–155 Ma)(15)
563596–3673Triassic1212 Ma<125Post-deposition
(208–245 Ma)8.9 μm
  • * All numerical values for stratigraphic ages assigned following Harland et al. (1989).

  • Values of vitrinite reflectance (for VR samples) or fission-track age and mean track length (for AFTA samples) predicted from the respective ‘default thermal history’ (as defined in the text) for each sample.

  • Numbers in parentheses show the number of fields measured, where available.

  • § Thermal history interpretation has been carried out using methods outlined by Green et al. (2001a,b).