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首页> 外文期刊>Geophysics: Journal of the Society of Exploration Geophysicists >Capacitive conductivity logging and electrical stratigraphy in a high-resistivity aquifer, Boise Hydrogeophysical Research Site
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Capacitive conductivity logging and electrical stratigraphy in a high-resistivity aquifer, Boise Hydrogeophysical Research Site

机译：博伊西水文地球物理研究站点的高电阻率含水层中的电容电导率测井和电地层学

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摘要

We tested a prototype capacitive-conductivity borehole tool in a shallow, unconfined aquifer with coarse, unconsolidated sediments and very-low-conductivity water at the Boise Hydrogeophysical Research Site (BHRS). Examining such a high-resistivity system provides a good test for the capacitive-conductivity tool because the conventional induction-conductivity tool (known to have limited effectiveness in high-resistivity systems) did not generate expressive well logs at the BHRS. The capacitive-conductivity tool demonstrated highly repeatable, low-noise behavior but poor correlation with the induction tool in the lower-conductivity portions of the stratigraphy where the induction tool was relatively unresponsive. Singular spectrum analysis of capacitive-conductivity logs reveals similar vertical-length scales of structures to porosity logs at the BHRS. Also, major stratigraphic units identified with porosity logs are evident in the capacitive-conductivity logs. However, a previously unrecognized subdivision in the upper portion of one of the major stratigraphic units can be identified consistently as a relatively low-conductivity body (i.e., an electrostratigraphic unit) between the overlying stratigraphic unit and the relatively high-conductivity lower portion - despite similar porosity and lithology in adjacent units. The high repeatability and resolution and the wide dynamic range of the capacitive-conductivity tool are demonstrated here to extend to high-resistivity, unconsolidated sedimentary aquifer environments.
机译：我们在博伊西水文地球物理研究站（BHRS）的浅水无约束含水层中，用粗糙，未固结的沉积物和低电导率水测试了原型电导率钻孔工具。检查这种高电阻率系统为电容电导率工具提供了一个很好的测试，因为常规的感应电导率工具（已知在高电阻率系统中效率有限）在BHRS上没有生成表达测井曲线。电容电导率工具显示出高度可重复的，低噪声的行为，但在地层学的电导率较低的地层的低电导率部分中，与电导率工具的相关性较差。电容电导率测井的奇异谱分析显示，结构的垂直长度尺度与BHRS的孔隙率测井相似。而且，在电导率测井曲线中可以明显看出以孔隙度测井曲线识别的主要地层单位。但是，在一个主要地层单元的上部中先前未被识别的细分可以一致地识别为上覆地层单元和较高电导率下部之间的一个相对低电导率的主体（即电地层单元），尽管相邻单元的孔隙率和岩性相似。此处展示了电容电导率仪的高重复性和分辨率以及宽动态范围，可扩展到高电阻率，未固结的沉积含水层环境。

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