Lithostratigraphy from downhole logs in Hole AND-1B, Antarctica

Lithostratigraphy from downhole logs in Hole AND-1B, Antarctica
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南极洲 AND-1B 井下测井的岩石地层学

DOI:
10.1130/ges00655.1
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发表时间:
2012
期刊:
影响因子:
2.5
通讯作者:
Powell RD
Powell RD
中科院分区:
地球科学2区
文献类型:
--
作者:
Williams T;Morin RH;Jarrard RD;Jackolski CL;Henrys SA;Niessen F;Magens D;Kuhn G;Monien D;Powell RD

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ANDRILL(南极钻探项目)麦克默多冰架(MIS)项目在AND-1B孔钻取了1285米的沉积物,代表了过去1200万年的情况。冰川的历史。井下地球物理测井采集深度为1018 mbsf(海底以下米),与岩心采集数据互补。自然伽马辐射(NGR)和磁化率测井对了解ANDRILL麦克默多冰架孔AND-1B的岩性和古环境变化特别有用。NGR测井涵盖从海底到1018 mbsf的整个井段,磁化率和其他测井涵盖692 - 1018 mbsf和237-342 mbsf之间的裸眼井段。在AND-1B的上半部分,低NGR值和高NGR值之间的明显交替区分了碳酸盐岩(缺乏含有天然放射性K、U和Th的矿物)和杂岩(含有含钾粘土、钾长石、云母和重矿物)。在下部裸眼测井剖面中,NGR和磁化率还可以区分粘土岩(富含含钾粘土矿物,磁铁矿含量相对较低)和杂岩(磁铁矿含量相对较高)。砂岩可以通过其在AND-1B中的高电阻率值来区分。在这三个井下测井的基础上,可以正确预测692-1018 mbsf井段的74%的杂屑岩、粘土岩和砂岩。然后利用测井曲线预测取心未采出的6%井段的相。由于了解了不同相的物理性质特征,还可以从物理性质中识别岩性的细微变化,并帮助细化部分岩石地层,例如,碳酸盐岩的陆源含量变化以及从次冰杂岩到开放水域碳酸盐岩的过渡。
The ANDRILL (Antarctic Drilling Project) McMurdo Ice Shelf (MIS) project drilled 1285 m of sediment in Hole AND-1B, representing the past 12 m.y. of glacial history. Downhole geophysical logs were acquired to a depth of 1018 mbsf (meters below seafloor), and are complementary to data acquired from the core. The natural gamma radiation (NGR) and magnetic susceptibility logs are particularly useful for understanding lithological and paleoenvironmental change at ANDRILL McMurdo Ice Shelf Hole AND-1B. NGR logs cover the entire interval from the seafloor to 1018 mbsf, and magnetic susceptibility and other logs covered the open hole intervals between 692 and 1018 and 237–342 mbsf. In the upper part of AND-1B, clear alternations between low and high NGR values distinguish between diatomite (lacking minerals containing naturally radioactive K, U, and Th) and diamictite (containing K-bearing clays, K-feldspar, mica, and heavy minerals). In the lower open hole logged section, NGR and magnetic susceptibility can also distinguish claystones (rich in K-bearing clay minerals, relatively low in magnetite) and diamictites (relatively high in magnetite). Sandstones can be distinguished by their high resistivity values in AND-1B. On the basis of these three downhole logs, diamictite, claystones, and sandstones can be predicted correctly for 74% of the 692–1018 mbsf interval. The logs were then used to predict facies for the 6% of this interval that was unrecovered by coring. Given the understanding of the physical property characteristics of different facies, it is also possible to identify subtle changes in lithology from the physical properties and help refine parts of the lithostratigraphy, for example, the varying terrigenous content of diatomites and the transitions from subice diamictite to open-water diatomite.
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