Ichnofabric logs for the characterization of the organic content in carbonates

Ichnofabric logs for the characterization of the organic content in carbonates
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用于表征碳酸盐中有机含量的 Ichnofabric 测井

DOI:
10.1016/j.marpetgeo.2018.04.019
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发表时间:
2018
影响因子:
4.2
通讯作者:
Betzler
Betzler
中科院分区:
地球科学2区
文献类型:
--
作者:
Reolid;Betzler

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这项研究提出了一种可视化岩心生物数据的方法,允许直接与井下测井进行比较。它提供了初步但准确的环境信息,特别是关于海底氧气和/或有机物含量的信息。该方法包括三个步骤:步骤1)沉积物的生物分析,包括生物扰动强度的量化,主要遗迹分类群和洞穴的大小,洞穴或分层的深度,以及交叉关系的记录;步骤2)遗迹组构定义遵循包括生物扰动指数、遗迹组合和沉积物类型在内的一系列标准;以及步骤3)从低生物扰动指数和深层到完全生物扰动的遗迹组构的组织。所得到的遗迹组构是按深度绘制的,可以直接与能谱自然伽马测井进行比较,在所讨论的例子中,能谱自然伽马测井主要是反映沉积物中有机质含量的铀含量的变化。在IODP 359探险期间对马尔代夫碳酸盐沉积岩心进行的遗迹组构分析表明,合成遗迹组构测井与井下伽马辐射测井之间具有良好的相关性。对这些测井的综合研究提供了有关沉积物有机质含量主要变化的信息。这里给出的遗迹组构的图形表示和伽马射线测井是沉积学家研究岩心的一个非常有用的工具。
This study proposes an approach to visualize ichnological data from cores that allows direct comparison with downhole logs. It provides preliminary but accurate environmental information, especially on the oxygenation and/or the organic matter content at the sea floor. The method comprises three steps: Step 1) ichnological analysis of the sediments including quantification of bioturbation intensity, identification of the main ichnotaxa and sizes of the burrows, depth of burrowing or tiering, and documentation of cross-cutting relationships; Step 2) ichnofabric definition following a series of criteria including the bioturbation index, the ichnoassemblage, and the sediment type; and Step 3) the organization of the ichnofabrics from low bioturbation indices and deep tiers to completely bioturbated. The resulting ichnofabrics are plotted against depth and can directly be compared to spectral natural gamma ray logs, which in the discussed example are dominated by variations of the uranium content reflecting the organic matter content in the sediment. The ichnofabric analysis of carbonate sediment cores of the Maldives, recovered during IODP Expedition 359, demonstrates a good correlation between synthetic ichnofabric logs and downhole gamma radiation logs. The combined study of these logs provides information on the main changes in the organic matter content of the sediment. The graphical representation of ichnofabrics together with gamma ray logs presented here is a very useful implement for sedimentologists working on cores.
DOI: 10.1186/s40645-018-0165-x
发表时间: 2018-01-22
影响因子: 3.9
作者:
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DOI: 10.1038/srep29838
发表时间: 2016-07-20
期刊: Scientific reports
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DOI: --
发表时间: 2016
期刊:
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通讯作者: Edwin I. Egbobawaye
DOI: --
发表时间: 2015
期刊:
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作者:
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