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Laser-induced fluorescence logging as a high-resolution characterisation tool to assess LNAPL mobility.
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-04-04 , DOI: 10.1016/j.scitotenv.2020.138480
Jonás García-Rincón 1 , Evangelos Gatsios 1 , John L Rayner 2 , Robert G McLaughlan 3 , Greg B Davis 4
Affiliation  

High-resolution characterisation tools such as Laser-Induced Fluorescence (LIF) logging represent a step forward towards a more effective management of sites contaminated by light non-aqueous phase liquid (LNAPL) petroleum hydrocarbons. In this paper, the applicability of LIF response as an indicator of LNAPL mobility at one site with an unconsolidated aquifer was investigated. LIF profiles were logged adjacent to twin coring locations and wells with LNAPL transmissivity (Tn) measurements in a heterogeneous gasoline contaminated site in Western Australia. LIF response was correlated to Tn to a greater extent than LNAPL saturation (Sn) measurements from coring. In particular, LIF signal maxima were a better indicator of Tn than the integral LIF signal. Furthermore, LIF allowed rapid identification of areas with long-term near-immobile LNAPL (entrapped and residual) because of the multi-wavelength waveforms associated with distinct subsurface characteristics. It was also demonstrated that the delineation of presumably less-mobile intervals could be enhanced by using the relative LIF response in the 350 nm wavelength channel. Thus, this work gave evidence that LIF logging provides valuable information about LNAPL distribution and mobility in commonly found subsurface settings, despite generally poor correlations with Sn measurements. LIF probes can be successfully used to guide the installation and application of more costly conventional methods in addition to the development of existing site models.

中文翻译:

激光诱导荧光测井是评估LNAPL迁移率的高分辨率表征工具。

高分辨率表征工具(如激光诱导荧光(LIF)测井)代表了朝着更有效地管理被轻非水相液体(LNAPL)石油烃污染的地点迈出的一步。本文研究了LIF响应作为LNAPL流动性指标在非固结含水层一处的适用性。在西澳大利亚州的一个异质汽油污染站点中,通过双线性取心位置和油井记录了LIF剖面,并通过LNAPL透射率(Tn)测量。与取芯的LNAPL饱和度(Sn)测量值相比,LIF响应与Tn的相关程度更大。特别是,与积分LIF信号相比,LIF信号最大值是Tn的更好指标。此外,由于与明显的地下特征相关的多波长波形,LIF可以快速识别具有长期近固定LNAPL的区域(被捕获和残留)。还证明了通过使用在350 nm波长通道中的相对LIF响应,可以增强大概移动间隔的描绘。因此,这项工作提供了证据,尽管与Sn测量的相关性通常较差,但LIF测井提供了有关LNAPL分布和在常见地下环境中流动性的有价值的信息。除了开发现有的站点模型外,LIF探针还可以成功地用于指导更昂贵的常规方法的安装和应用。还证明了通过使用在350 nm波长通道中的相对LIF响应,可以增强大概移动间隔的描绘。因此,这项工作提供了证据,尽管与Sn测量的相关性通常较差,但LIF测井提供了有关LNAPL分布和在常见地下环境中流动性的有价值的信息。除了开发现有的站点模型外,LIF探针还可以成功地用于指导更昂贵的常规方法的安装和应用。还证明了通过使用350 nm波长通道中的相对LIF响应,可以增强移动间隔的描绘。因此,这项工作提供了证据,尽管与Sn测量的相关性通常较差,但LIF测井提供了有关LNAPL分布和在常见地下环境中流动性的有价值的信息。除了开发现有的站点模型外,LIF探针还可以成功地用于指导更昂贵的常规方法的安装和应用。这项工作提供了证据,尽管与Sn测量的相关性通常较差,但LIF测井提供了有关LNAPL分布和常见地下环境中迁移率的有价值的信息。除了开发现有的站点模型外,LIF探针还可以成功地用于指导更昂贵的常规方法的安装和应用。这项工作提供了证据,尽管与Sn测量的相关性通常较差,但LIF测井提供了有关LNAPL分布和常见地下环境中迁移率的有价值的信息。除了开发现有的站点模型外,LIF探针还可以成功地用于指导更昂贵的常规方法的安装和应用。
更新日期:2020-04-06
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