Geochemistry of ODP Hole 128-798B

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 uncertainties predicted by the processing. The recent application of a modified boron sleeve to the Ocean Drilling Program's geochemical logging tool is shown to reduce interference of borehole chlorine on the resultant chemistry.

近年来，通过地球化学测井测定元素浓度的技术已得以确立。然而，在部分环境中获取的此类数据的质量仍有待量化评估。本研究以798B钻孔的一套岩心样品的X射线荧光光谱法（XRF）测试结果为参照，对地球化学测井曲线的质量进行了评估。所得岩心-测井对比结果仅为尚可等级，原因是该测井工具受到了地层极高孔隙度的不利影响。但该结果确实落在了数据处理流程所预测的统计不确定度范围内。现有研究表明，将改良型硼衬套应用于大洋钻探计划（Ocean Drilling Program）的地球化学测井工具，可降低井眼氯对最终测定化学成分的干扰。