Proceedings of the Ocean Drilling Program 1992
DOI: 10.2973/odp.proc.sr.127128-2.221.1992
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Evaluation of Quality of Geochemical Log Data in ODP Hole 798B

Abstract: The capability of determining elemental concentrations through geochemical logging has recently been established. However, the quality of these data obtained in some environments has yet to be quantified. We assess the quality of geochemical logs compared with XRF results from a suite of core samples from Hole 798B. The resulting core/log correlations are only fair, because the tool has been adversely affected by the very high porosity of the formation. The results, however, do fall within the statistical unce… Show more

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Cited by 7 publications
(3 citation statements)
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References 8 publications
(14 reference statements)
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“…These break-outs occur over relatively small intervals (c. 2 m) and so only a small amount of logging data have been lost due to the stand-off effect. Individual tools are affected to different degrees by stand-off, but the ACT is particularly sensitive to this effect and as such can be used as a monitor of tool performance (Bristow & deMenocal 1992). In Hole 896A the A1 yields from the ACT rapidly fall in the break-outs, but in the remainder of the hole the small scale relief of the borehole does not significantly affect this tools performance (Fig.…”
Section: Logging Tools and Datamentioning
confidence: 99%
“…These break-outs occur over relatively small intervals (c. 2 m) and so only a small amount of logging data have been lost due to the stand-off effect. Individual tools are affected to different degrees by stand-off, but the ACT is particularly sensitive to this effect and as such can be used as a monitor of tool performance (Bristow & deMenocal 1992). In Hole 896A the A1 yields from the ACT rapidly fall in the break-outs, but in the remainder of the hole the small scale relief of the borehole does not significantly affect this tools performance (Fig.…”
Section: Logging Tools and Datamentioning
confidence: 99%
“…In some environments logged by ODP certain elements are below the detection resolution of the tool (Bristow and deMenocal, 1992;Jarrard and Lyle, 1991). This is more often the case in high-porosity environments, where most of the detected gamma-ray spectrum is derived from Cl and H in the formation and borehole, rather than from the rock matrix.…”
Section: Reconstruction Of the Relative Elemental Yields From The Recmentioning
confidence: 96%
“…As an alternative to the gamma ray core measurement, Bristow & deMenocal (1992) use a 'proxy' terrugineous curve produced from core data to match to the logged gamma ray curve (SGR). This terrugineous curve is calculated as the residual opal content (100% minus opal wt% content).…”
Section: Incorrect Depth Assignmentmentioning
confidence: 99%