Integration of core, logging and drilling data in modern reefal carbonates to improve core location and recovery estimates (IODP Expedition 310)

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doi: 10.1144/0016-76492007-041
Author(s): Inwood, J.; Brewer, T.; Braaksma, H.; Pezard, P.
Author Affiliation(s): Primary:
University of Leicester, Department of Geology, Leicester, United Kingdom
Other:
Université de Montpellier II, France
Volume Title: Journal of the Geological Society of London
Source: Journal of the Geological Society of London, 165(2), p.585-596. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649 CODEN: JGSLAS
Note: In English. 15 refs.; illus., incl. 6 tables, sketch map
Summary: Palaeoclimate and sea-level studies commonly rely on interpretations based on depth. The location and quantity of core recovered during a drilling expedition has direct implications for subsequent applications of core measurements. A key objective of Integrated Ocean Drilling Program (IODP) Expedition 310 is to establish the course of postglacial sea-level rise for Tahiti in the South Pacific, for which assigning the correct depth to recovered core is fundamental. By convention, core is placed at the top of the core barrel run from which it was collected. Unless core recovery is 100%, this results in depth errors that are inversely proportional to the recovery. The difficulties of locating core are compounded for the Tahiti boreholes, where primary cavities in the carbonate reef successions are frequently present. Only through the integration of core with continuous geophysical measurements of the borehole can accurate depth positioning be achieved. High-resolution optical and acoustic images of the borehole wall allow effective visual correlation of the core and logging datasets. The final integrated depths form the underlying framework for all subsequent scientific analyses of recovered core employing evaluations that rely on depth. Furthermore, the integration process allows true core recoveries to be accurately estimated.
Year of Publication: 2008
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; Acoustical logging; Boreholes; Carbonate rocks; Cenozoic; Cores; Correlation; Depth; Drilling; Expedition 310; French Polynesia; Geophysical methods; Holocene; Imagery; Integrated Ocean Drilling Program; Oceania; Pacific Ocean; Paleoclimatology; Polynesia; Porous materials; Quaternary; Reefs; Sea-level changes; Sedimentary rocks; Society Islands; South Pacific; Tahiti; Tahiti Sea Level Expedition; Well-logging
Coordinates: S180000 S170000 W1490000 W1500000
Record ID: 2008066362
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States, Reference includes data from The Geological Society, London