Grand Banks non-exclusive data now available for purchase
Posted Monday July 13th, 2015, 10:12 am
An independent, regional chemostratigraphic correlation has been constructed for the Cretaceous and Jurassic successions penetrated by offshore wells from across the Grand Banks area and includes key exploration wells from the: Orphan, Flemish Pass, Jeanne d’Arc and Carson basins, in addition to wells from the Outer Ridge Complex. Geochemical data have been collected via ICP instruments from a total of 28 wells, with a further 24 wells currently under investigation (data available from early September, 2015).
Cuttings samples were collected from base Tertiary through to TD, with a focus on the Jurassic and Cretaceous successions and includes the organic-rich source rock intervals of the Rankin Formation and the prolific, syn-rift sandstones of the Jeanne d’Arc, Fortune Bay, Hibernia and Avalon units. An independent chemostratigraphic correlation, comprising first, second and third-order chemostratigraphic divisions, was developed across the study area and integrated, where possible, with existing lithostratigraphic and biostratigraphic data, providing a high resolution stratigraphic framework with which to calibrate wireline and seismic based correlations. The chemostratigraphic correlation is based on up-sequence variations in key elements and elemental ratios reflecting changes in lithology, clay mineralogy, heavy mineral and feldspar assemblages and organic matter preservation. Furthermore, spatial variations in these mineral phases allows for inferences to be made regarding sediment input and organic preservation.
The elemental data used to produce the chemostratigraphic zonations and correlations have been further utilised to calculate mineralogy (ChemMin) and TOC over the well sections. The predicted mineralogy was calibrated against a sub-set of XRD data to provide a tailored and high-resolution mineralogical model across the entire Grand Banks area, utilising a fraction of the XRD analyses that would otherwise be required. The resultant mineralogical logs provide a strong visual summary of the bulk mineralogy across the analysed successions in each well, as well as providing a means of quickly assessing which minerals principally control the E-log responses. Although the geochemical data acquired is inorganic in nature, there are elements within the dataset that can be associated with organic material, for example U, Mo and Ni. Using the same principals developed for the mineral modelling described above, it was possible to estimate relative TOC abundance using elemental proxies, with this data being further supplemented and calibrated with acquired TOC data.
In addition to the extensive Grand Banks dataset, geochemical data have been acquired from the nearby Hopedale and Saglek basins (offshore Labrador) and Scotian Margin (including the Scotian Shelf and Scotian Slope) with a total of 24 wells being analysed to date.
Wells can be purchased individually or as area parcels. The data and interpretations are presented in a GIS-based data package which includes raw data (.xls, .csv), tabulated tops, key figures, chemical maps and study report – AVAILABLE NOW. Further details on the study can be found here.