Electrical resistivity of coal-bearing rocks under high …

The geophysical characteristics of coal and rock (such as magnetic susceptibility, remanent magnetization, self-potential and resistivity) in coal-fire areas will be changed dramatically at high temperature, which constitutes the foundation of corresponding geophysical methods to detect coal fires.

Detection and management of coal seam outcrop fire in …

Through the detection and treatment of the coal seam outcrop fire area, this project provides a new method for coal seam outcrop fire control and has broad application prospects. The methods and ...

The application of geophysics in South African coal mining …

Overview of coal mining problems. Safe and efficient coal extraction is often compromised by a variety of geological and mining-induced problems. In this paper, we will focus on the five most commonly occurring problems and explain how the application of selected geophysical methods can play a key role in addressing these problems.

Geophysical technologies for detecting underground …

An overview of the capabilities and limitations of various geophysical methods was followed by examples of geophys-ical techniques that could be used to detect mine …

Theory and application of magnetic and self-potential methods …

At present, the primary geophysical methods for detecting coal fires are based on various high-temperature induced geophysical anomalies such as magnetism (Bandelow & Gielisch, 2004;Gerlinde et al ...

Quantitative Prediction of Water Volumes Within a Coal …

Mine water and mine inflow water are closely linked to the risk of mine water disasters. The relationships between various geophysical parameters and the volume of water in mine tunnels were considered by using an integrated suite of appropriate geophysical methods [i.e. direct current (DC) resistivity, transient electromagnetic …

Applications of Geophysical Logs to Coal Mining— Some …

Geophysical borehole logging, which consists of measuring various in-situ petrophysical parameters such as the acoustic, radiometric and electric properties of the rocks down …

Multidisciplinary Geophysical Investigations over Deep Coal …

With the majority of coal mines in uncovered and semi-covered coal strata now explored and developed, most of the undiscovered coal-bearing strata are concealed. Compared with expensive drilling, deep targets such as concealed coal-bearing strata can be more efficiently and cost-effectively discovered through geophysical methods. We …

Geophysical and intrusive site investigations to detect

The detection and characterisation of near surface voids and undermining using geophysical methods has been demonstrated by several researchers (Banham and Pringle 2011, Kotyrba and Schmidt 2013 ...

Application of Comprehensive Geophysical Prospecting Method in …

Finally, the distribution of coal mined-out areas in the exploration area is obtained, and the results show that through the use of the transient electromagnetic method and controlled source audio ...

Application of Comprehensive Geophysical Prospecting Method …

The mining process involves many complex problems, which are easy to cause environmental pollution and safety. The comprehensive geophysical exploration method combined with drilling method is used to carry out fine exploration of goaf. Firstly, the high density resistivity method was carried out, the data was collected by Wenner …

Determination of coal layers using geophysical well-logging …

The most commonly used well-logging methods for determining coal layers are radioactive (gamma ray, neutron and gamma–gamma) and electrical (resistivity, …

Sustainability | Free Full-Text | Methods for the Geophysical

Geophysical methods have made some progress in detecting abandoned coal mines, but there are still some challenges and difficulties. The resolution of seismic exploration may not be enough to accurately describe the details of coal seams and CBM rich areas, and the effect of resistivity method in deep CBM exploration is limited.

Review and Challenges in the Geophysical …

Generally, the water-bearing structures of coal mines mainly include coal seam, roof, coal seam, floor, and goaf, while the main water-conducting structures include faults, collapsed columns, and collapsed …

Theory and application of magnetic and self-potential methods …

Basic theory of self-potential method in detecting coal fires. Self-potential is a non-invasive geophysical method that measures the natural potential of the earth (Nyquist and Corry, 2002). This method is called non-invasive because it does not cause any disturbance to the earth.

Geophysical investigation of Wuda Coal Mining Area

In this study, various geophysical methods were used to detect the surface and subsurface coal mine fires. Geophysical techniques used in the present study are apparent resistivity, self-potential ...

Methods of fault detection with geophysical data and surface geology

Seismic reflection data are useful for detecting low-angle acoustic-impedance contrasts whereas faults tend to be steep, but that's where potential–field methods and surface geology may help. Vertical resolution in seismic surveys is 1/4λ (Widess, 1973) where λ = interval velocity / frequency = wavelength.

Water Detection within the Working Face of an Underground Coal …

There are very few methods that can detect or map water remotely within the working face of a mine. The two-dimensional (2D) electrical resistivity tomography (ERT) method is sufficient for detecting water directly above the roof and below the floor, but it fails to detect water within the internal blocks of the working face.

Using the integrated geophysical methods detecting active …

DOI: 10.1016/J.JAPPGEO.2017.01.030 Corpus ID: 133373124; Using the integrated geophysical methods detecting active faults: A case study in Beijing, China @article{Wang2017UsingTI, title={Using the integrated geophysical methods detecting active faults: A case study in Beijing, China}, author={Zhihui Wang and Xiangmin Cai …

Geophysical Methods, Exploration Geophysics » Geology …

Modified date: 03/12/2023. Geophysics is a branch of Earth science that utilizes principles and techniques from physics to study the physical properties and processes of the Earth. It involves the application of various methods to investigate the subsurface structure, composition, and dynamics. Geophysical methods are essential tools for ...

Research on the Channel Wave Field Characters of Goaf in Coal …

Underground detection method includes: pit radio wave penetration method, mine direct current method, down-hole instant electromagnetic grooving method, seismic wave method [6–10] and so on. These geophysical methods try to detect the differences of physical properties between the coal and the goaf to obtain the distribution of …

Geological exploration of coal mine burnt rock and …

To accurately determine the boundaries of burnt rock and water accumulation areas in the Jiangjun Gobi No. 1 open-pit coal mine, this paper uses different …

GEOPHYSICAL METHODS FOR COAL FIRE DETECTION AND …

Hence the methods of choice are airborne magnetics and frequency electromagnetics (AEM) for surveying large and inaccessible areas and ground based …

COALINLAS, a software for detecting coal beds in well-logs

In this paper, the algorithm and working method of the software are described, which allows the detection of depth and thickness of coal beds by digital information in well-logs. The software known as COALINLAS is designed and developed in Visual Studio using C# by the authors. In this software, a boundary value of each log is …

Advanced forecast of coal seam thickness variation by …

In detecting goaf of coal mine with high-resistivity and shallow-layer, the commonly used method is the high density resistivity method while is TEM is considered to be sensitive for low ...

A Review of Geophysical Exploration Technology for Mine

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Advanced forecast of coal seam thickness variation by …

In this paper, analyzing the geophysical feature of the thickness change, combing with the response characteristics of seismic and electromagnetic detection, we adopted seismic reflected wave method to master interface information of the change point, utilized transient electromagnetic method to gain the physical index of the thick or thin …

Detection and delineation of coal mine fire in Jharia coal

Coal mine fire is a serious problem in Jharia coal field, India. The coal mine fire can be detected with different techniques such as borehole temperature measurement, thermo-compositional analysis, remote sensing techniques, thermo-graphic measurement and geophysical methods. In this study, various geophysical methods were used to …

Sustainability | Free Full-Text | Methods for the Geophysical

Geophysical exploration methods are attractive for application in abandoned coal mines owing to their low cost and non-destructive detection of deep …

Comprehensive exploration approach of coal mine water

In the process of coal mining, prevention and control of water hazard is essential. It is the precondition for water hazard control to detect and determine the distribution of underground water-conducting channels. In urban environments, traditional methods such as active source seismic exploration and transient electromagnetic …

Overview on the application of geophysics in coal mining

Since their introduction to the coal mining industries of the United Kingdom and West Germany in the 1970s, geophysical methods are now utilised in coal mining around the world. The range of applications in both surface and underground mining is extensive. Applications include coal seam mapping and geological fault detection, …

Remote Sensing | Free Full-Text | Underground …

The common identification methods of coal fire areas include the census method, geophysical method, and remote sensing method [4,8].The first two methods require workers to carry equipment …

A Review of Geophysical Exploration Technology for Mine

Geophysical exploration can be effective in detecting and monitoring potential sources of coal mine water in-rushes and underground watercourses. Generally, in-mine seismic, DC resistivity, and transient electromagnetic methods are used for such purposes in China. However, such technologies can be influenced by many factors, …

Theoretical analysis of mine transient electromagnetic method …

Water-filled mining goaves are extremely prone to water inrush accidents in coal mines, and the transient electromagnetic method (TEM) is a good geophysical method for detecting water-rich areas.

Geophysical technologies for detecting underground …

The use of geophysical technologies in the U.S. coal indus-try has been sporadic when compared to other nations, despite recent advances and innovations. A robust multifaceted coal geophysics program was fully utilized by a U.S. coal company from 1985 to 2000 to detect and map prospective coal areas as well as various geologic anomalies and man ...

Development of a ground penetrating radar system for …

With the increasing coal mining efficiency, the geological disaster sources in the mine serious threat production safety, Ground Penetrating Radar (GPR) is widely used for detecting those hidden disaster sources attributed to the advantage of high precision, but with detection distance limitation. We describe a novel GPR system for large …