Basalt characterization by means of nuclear and electrical well logging techniques. Case study from Southern Syria

Asfahani, Jamal

doi:10.1016/j.apradiso.2010.12.008

Cited by 16 publications

(17 citation statements)

References 10 publications

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“…The lowest porosity values were obtained with configuration (4). This is the most consistent estimate with reported data for volcanic environments [63]. Finally, all information was integrated within a Schlumberger Petrel ® platform [64] to perform petrophysical data analyses.…”

Section: Borehole Drilling and Well Log Analysissupporting

confidence: 60%

Water Supply Source Evaluation in Unmanaged Aquifer Recharge Zones: The Mezquital Valley (Mexico) Case Study

Hernández-Espriú

Arango-Galván

Reyes-Pimentel³

et al. 2016

Water

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Abstract:The Mezquital Valley (MV) hosts the largest unmanaged aquifer recharge scheme in the world. The metropolitan area of Mexico City discharges~60 m 3 /s of raw wastewater into the valley, a substantial share of which infiltrates into the regional aquifer. In this work, we aim to develop a comprehensive approach, adapted from oil and gas reservoir modeling frameworks, to assess water supply sources located downgradient from unmanaged aquifer recharge zones. The methodology is demonstrated through its application to the Mezquital Valley region. Geological, geoelectrical, petrophysical and hydraulic information is combined into a 3D subsurface model and used to evaluate downgradient supply sources. Although hydrogeochemical variables are yet to be assessed, outcomes suggest that the newly-found groundwater sources may provide a long-term solution for water supply. Piezometric analyses based on 25-year records suggest that the MV is close to steady-state conditions. Thus, unmanaged recharge seems to have been regulating the groundwater balance for the last decades. The transition from unmanaged to managed recharge is expected to provide benefits to the MV inhabitants. It will also be likely to generate new uncertainties in relation to aquifer dynamics and downgradient systems.

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Section: Borehole Drilling and Well Log Analysissupporting

confidence: 60%

Water Supply Source Evaluation in Unmanaged Aquifer Recharge Zones: The Mezquital Valley (Mexico) Case Study

Hernández-Espriú

Arango-Galván

Reyes-Pimentel³

et al. 2016

Water

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“…Calibrations and oxide-closure models have been devised for geochemical logging in oceanic basalts as well as other crystalline rocks [15]. Well logging techniques have contributed to the characterization and identification of the nuclear and electrical signatures of basalt formations [16]. A few studies have reported on groundwater flow and hydrodynamic flow systems in basalt areas.…”

Section: Introductionmentioning

confidence: 99%

A Borehole-Based Approach for Seawater Intrusion in Heterogeneous Coastal Aquifers, Eastern Part of Jeju Island, Korea

Shin

Hwang

2020

Water

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Understanding the basaltic aquifer system and seawater intrusion on the volcanic island of Jeju, Korea, has received significant attention over the years, and various methodologies have been suggested in the contributions. Nevertheless, it is still difficult to effectively characterize groundwater systems due to the long period of volcanic activity and the lithological variability of basalt. In this study, geophysical well logging in seawater intrusion monitoring boreholes detected a sudden decrease of electrical conductivity within the saltwater zone in the eastern part of Jeju Island. This anomalous condition cannot be explained by the Ghyben-Herzberg model, which has historically been considered as the basic groundwater model of Jeju Island. This paper focuses on fine-scale temporal and spatial variability of groundwater flow using electrical conductivity and temperature logs and borehole temperature monitoring by a thermal line sensor. On the basis of the results, we evaluate an alternative model to replace the traditional conceptual model in the eastern part of Jeju Island. It is revealed that the area consists of heterogeneous aquifer systems, and the behavior of freshwater and saltwater is understood by temperature monitoring over the entire depth of boreholes. Coastal aquifers flow through two or more independent channels with weak vertical connections. In addition, seawater intrusion does not occur continuously in the vertical direction from the bottom depth, but instead occurs through these multilayered aquifers. In particular, the multilayered aquifers that are responsible for flow pathway, as well as the freshwater–saltwater interface form mainly at lithological boundaries. Our preliminary conceptual model is expected to be improved and revised by various measurements of hydrodynamic parameters such as flowmeter or packer test.

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“…An extensive revision of geophysical logging was described in detail by Helm-Clark et al (2004), while Zakharova et al (2012) analyzed the hydraulics of core samples and geophysical logging data from basalt formations of the Columbia River Basalt Group. The porosity, represented by vesicles and fractures, is one of the main features that govern the variation of physical properties of basalts, as demonstrated by several authors such as Helm-Clark et al (2004), Asfahani (2011), andZakharova et al (2012).…”

Section: Introductionmentioning

confidence: 95%

“…The facies that comprise basalt floods present strong variations of physical properties (e.g., Peterson and Lao 1970, Helm-Clark et al 2004, Asfahani et al 2011, Zakharova et al 2012. The strong contrast in physical properties means that geophysical logging is a prominent tool that can be used to characterize the stratigraphic features of flood basalts (Helm-Clark et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Assessing hydrofacies and hydraulic properties of basaltic aquifers derived from geophysical logging

2020

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Basaltic aquifers are an important source of water supply in many regions worldwide. Because of their cooling process, flood basalts normally have complex internal structures and unpredictable permeable zone distribution. Geophysical profiling is a reliable tool used to identify the vertical variations of physical properties within the flood basalts, mainly to distinguish between low and high permeability intervals. In this study, a detailed analysis of drill cuttings, and geophysical logging of two depth wells helped to identify the typical response of main facies of flood basalts in the Serra Geral aquifer system. The evidence obtained from this work confirms that flood basalts may be classified as multilayer aquifer systems in which a highly permeable top covers a center with low permeability as a result of recurrent floods. In several cases, permeable layers are represented by a weathering horizon developed between two flood events. This study uses an empirical model to estimate the porosity based on acoustic velocity logging. A useful model based on a well-established Kozeny-Carman model was developed to predict the permeability of basaltic rocks using porosity data. The results obtained allow to identify the permeable intervals of basaltic aquifers and to estimate their hydraulic properties.

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Basalt characterization by means of nuclear and electrical well logging techniques. Case study from Southern Syria

Cited by 16 publications

References 10 publications

Water Supply Source Evaluation in Unmanaged Aquifer Recharge Zones: The Mezquital Valley (Mexico) Case Study

Water Supply Source Evaluation in Unmanaged Aquifer Recharge Zones: The Mezquital Valley (Mexico) Case Study

A Borehole-Based Approach for Seawater Intrusion in Heterogeneous Coastal Aquifers, Eastern Part of Jeju Island, Korea

Assessing hydrofacies and hydraulic properties of basaltic aquifers derived from geophysical logging

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