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      Data report: interpretation of cored intervals with greater than one hundred percent core recovery: IODP Expedition 313 used as an example methodology

      Proceedings of the IODP
      International Ocean Discovery Program

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          Abstract

          Conventionally, depths of core recovered during a drilling and coring expedition are determined by placing the top of the recovered core at the top of the core barrel run that recovered it. During many ocean drilling expeditions, certain intervals of core recovered from a drill run are recorded as 100% or greater, resulting in an overlap in core depths between adjacent runs. There are various reasons for these overlaps; significantly, the presence of clay that expands on recovery, as well as other possibilities including gas expansion, slipped cores recovered by subsequent runs, and disturbances during drilling leading to retrieval of surplus loose material. These intervals of overlap require cautious treatment to avoid potential confusion in analysis if different cores are sampled at apparently equivalent depths. Scientists need to be precise in the explanation of their method of dealing with any such overlaps. During Integrated Ocean Drilling Program Expedition 313, a mixture of siliciclastic sediments were recovered from three sites on the New Jersey shallow shelf. This report identifies intervals of core overlap from the conventional depth determination and analyzes their origin by combining core lithologic observations with notes taken during drilling operations and recorded drilling parameters. Drilling parameters represent an underutilized resource in the interpretation of core recovered during drilling, especially for measurements in which assumptions are made on the quality of the core. Downhole logs provide independent depth control and, through analysis in tandem with equivalent core petrophysical measurements, an evaluation can be made of how to optimally deal with overlapping core intervals. The advantages of the methodology presented go beyond the Expedition 313 examples illustrated here and could be applied to other expeditions.

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          Most cited references23

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          Clay swelling — A challenge in the oilfield

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            Refinement of a High-Resolution, Continuous Sedimentary Section for Studying Equatorial Pacific Ocean Paleoceanography, Leg 138

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              Sediment Disturbance and Correlation of Offset Holes Drilled with the Hydraulic Piston Corer: Leg 94

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                Author and article information

                Journal
                10.2204/iodp.proc.313.2010
                Proceedings of the IODP
                International Ocean Discovery Program
                1930-1014
                25 September 2018
                Article
                10.2204/iodp.proc.313.202.2018
                e7c04e38-5295-49ac-8a03-46b1ae0f0764

                This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

                History

                Earth & Environmental sciences,Oceanography & Hydrology,Geophysics,Chemistry,Geosciences

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