Application of a high‐resolution seismic investigation in a Greek coal mine

Geophysics ◽  
2002 ◽  
Vol 67 (1) ◽  
pp. 50-59 ◽  
Author(s):  
G.‐Akis Tselentis ◽  
Paraskevas Paraskevopoulos
Keyword(s):  
High Resolution ◽  
Coal Mine ◽  
Seismic Reflection ◽  
Seismic Survey ◽  
Coal Field ◽  
Detailed Structure ◽  
Coal Basin ◽  
Geostatistical Methods ◽  
Reflection Seismic ◽  
D Model

High‐resolution seismic methods were applied to map the detailed structure and thickness of the Domeniko coal basin (central Greece) and to search for lateral discontinuities, such as pinch‐outs and faults. Extensive tests were performed to optimize recording parameters and equipment. Reflection events which can be attributed to coal layers can be interpreted from depths of approximately 30 to 150 m on CDP stacked and inverted sections. Several low‐throw faults have been interpreted from the sections. Results obtained from the high‐resolution seismic reflection survey combined with drillhole information clearly revealed the 3‐D model of the coal field. Using geostatistical methods, the results of the high‐resolution reflection seismic survey were combined with the information from the borehole program to clearly reveal the 3‐D model of the basin.

High Resolution Seismic Reflection For Characterizing Longwall Coal Mine Subsidence

1993 ◽  
Author(s):  
James A. Jessop ◽  
Calvin L. Cumerlato ◽  
Kevin M. O‘Connor ◽  
John A. Siekmeier
Keyword(s):  
High Resolution ◽  
Coal Mine ◽  
Seismic Reflection ◽  
Mine Subsidence

To: “Shallow to very shallow, high‐resolution reflection seismic using a portable vibrator system,” Ranajit Ghose, Vincent Nijhof, Jan Brouwer, Yoshikazu Matsubara, Yasuhiro Kaida, and Toru Takahashi (July‐August 1998 GEOPHYSICS, 63, p. 1295–1309)

Geophysics ◽  
1998 ◽  
Vol 63 (6) ◽  
pp. 2154-2154
Keyword(s):  
High Resolution ◽  
Seismic Reflection ◽  
Time Section ◽  
Reflection Seismic ◽  
Reflection Time

Please refer to page 1302, right column, second full paragraph, first sentence, which currently reads: Figure 10 presents a part of the seismic reflection depth section. It should have read: Figure 10 presents a part of the seismic reflection time section.

Seismic reflection profiles across the "Mine Series" in the Noranda camp of the Abitibi belt, eastern Canada

1995 ◽  
Vol 32 (2) ◽  
pp. 167-176 ◽  
Author(s):  
Pierre Verpaelst ◽  
A. Shirley Péloquin ◽  
Erick Adam ◽  
Arthur E. Barnes ◽  
John N. Ludden ◽  
...  
Keyword(s):  
High Resolution ◽  
Seismic Reflection ◽  
Mineral Exploration ◽  
Drill Hole ◽  
Seismic Survey ◽  
Volcanic Complex ◽  
Eastern Canada ◽  
Crustal Layer ◽  
High Resolution Data ◽  
Seismic Reflection Profiles

The Abitibi–Grenville Lithoprobe project completed a regional (line 21) and a high-resolution (line 21-1) seismic survey in the Noranda Central Volcanic Complex of the Blake River Group, Abitibi, Quebec. Line 21 provides a regional framework in which the Archean crust is divided into three layers, two of which are discussed here: the uppermost layer, which corresponds to the Blake River Group, is the least reflective, and lies above 4 s (12 km), and the mid-crustal layer, which is composed of a complex pattern of generally east-northeast-dipping reflectors and lies between 4 and 8 s. Within the regional data, the Mine Series of the Central Volcanic Complex is imaged as a semitransparent series of reflectors overlying a highly reflective east-facing structure interpreted as the subvolcanic Flavrian pluton. The high-resolution data (line 21-1) were collected in the vicinity of the Ansil mine. The seismic images in this region can be controlled by surface geology and extensive drill-hole data, and the project was designed to test the applicability of seismic reflection profiling in providing structural and stratigraphic information for use in mineral exploration: shallow-dipping reflectors correlate well with lithological variations or contacts in the volcanic sequence; strong subhorizontal reflectors correspond to diorite and gabbro dykes and sills; several abrupt lateral changes in the reflectivity coincide with known intrusive contacts such as the Lac Dufault pluton.

A new interpretation of geological structure of Tempoku Coal Field by crooked-line survey

1992 ◽  
Vol 23 (2) ◽  
pp. 241
Author(s):  
O. Nakano ◽  
M. Endo ◽  
E. Ishii ◽  
H. Watanabe
Keyword(s):  
Large Scale ◽  
Geological Structure ◽  
Seismic Survey ◽  
Coal Field ◽  
Coal Seams ◽  
Reflection Seismic ◽  
Line Method ◽  
Northern Island ◽  
New Interpretation ◽  
Seismic Lines

Tempoku Coal Field is located in the northern area of Japan's northern island, Hokkaido. Here the exploration target, the Soya Coal-Bearing Formation, is of Tertiary age overlying Cretaceous basement. The regional structure of the area is characterised by a series of synclines and anticlines trending north-northwest, with several reverse faults. A suite of surveys was carried out in 1991, in the Asajino area in the central part of the coal field. The study included drilling, vertical seismic profiling, and trenching, as well as a reflection seismic survey with the crooked-line method, which is the subject of this paper. The crooked-line method was adopted because of the mountainous terrain of the area. The seismic lines were laid out along existing tracks and valleys. The main geological structure of the area had long been considered to be a monotonous series of folds. However, the 1991 survey revealed a large-scale thrust-related structure in the main coal seams, which presented clear reflectors. Together with the data from other surveys, a reinterpretation of the structure of the Asajino area is proposed.

Locating faults in underground coal mines using high‐resolution seismic reflection techniques

Geophysics ◽  
1989 ◽  
Vol 54 (12) ◽  
pp. 1521-1527 ◽  
Author(s):  
Lawrence M. Gochioco ◽  
Steven A. Cotten
Keyword(s):  
High Resolution ◽  
Seismic Data ◽  
Seismic Reflection ◽  
Coal Mines ◽  
Seismic Source ◽  
Seismic Survey ◽  
Underground Coal Mines ◽  
Vertical Displacements ◽  
Seismic Sections ◽  
Mine Development

A high‐resolution seismic reflection technique was used to locate faults in coal seams that were not visible on the surface and could only be observed in underground coal mines. An 8‐gauge buffalo gun, built by the research and development department of Consolidation Coal Company, was used as the seismic source. The coal seam at a depth of 700 ft produces a reflection with a predominant frequency of about 125 Hz. The high‐resolution seismic data permitted faults with vertical displacements of the same magnitude as the seam thickness to be detected at depths of several hundred feet beneath the surface. Several faults were detected and interpreted from the seismic sections, and the magnitudes of their displacement were estimated by matching the recorded seismic data to synthetic seismic data. Subsequent underground mine development in the study area confirmed two interpreted faults and their estimated displacements. Mining engineers were able to use the information provided by the seismic survey to plan an entry system through the fault zone so that less rock needed to be mined, resulting in a safer and more productive mine.

High‐resolution 3-D seismic survey over a coal mine reserve area in the U.S.—A case study

Geophysics ◽  
2000 ◽  
Vol 65 (3) ◽  
pp. 712-718 ◽  
Author(s):  
Lawrence M. Gochioco
Keyword(s):  
High Resolution ◽  
Coal Mine ◽  
Seismic Data ◽  
Longwall Mining ◽  
Three Dimensional ◽  
Seismic Source ◽  
Seismic Survey ◽  
Geologic Structure ◽  
Reserve Area ◽  
Mine Development

A high‐resolution three‐dimensional (3-D) seismic survey was conducted in advance of coal mine development in the Illinois basin in May 1989 to better define a geologic structure with the potential to adversely affect longwall mining conditions. The 3-D seismic data indicate that an abrupt change in seam elevation, or roll, encountered near the northern property line trends south into the reserve area and then turns southeast. A personal computer‐based workstation was used to integrate borehole and seismic data for modeling in which 3-D block diagrams of the calculated seam elevations were generated. The block diagrams show a steep slope on the west flank of the roll that gradually decreases as the roll turns to the southeast. The survey also reveals a geologic structure beneath the roll at an estimated depth of 46–62 m. Horizontal time‐slice sections of this feature suggest the presence of a paleochannel that meanders on a similar course as the roll, which apparently was connected to a larger paleochannel system. A Conoco high‐frequency vibroseis unit was successfully used as the seismic source to generate the high frequencies necessary to detect and resolve the thin coal beds.

Geological interpretation of a high resolution reflection seismic survey at the Buchans mine, Newfoundland

1992 ◽  
Vol 29 (9) ◽  
pp. 2022-2037 ◽  
Author(s):  
J. G. Thurlow ◽  
C. P. Spencer ◽  
D. E. Boerner ◽  
L. E. Reed ◽  
J. A. Wright
Keyword(s):  
High Resolution ◽  
Seismic Data ◽  
Surface Expression ◽  
Seismic Survey ◽  
Geological Interpretation ◽  
Reflection Seismic ◽  
Underground Workings ◽  
Cost Efficient ◽  
Drill Holes ◽  
Structural Base

Sixteen kilometres of high resolution Vibroseis reflection seismic data have been acquired in the vicinity of the former Buchans mine. Direct identification of the cause of several reflectors is possible because the geology is tightly constrained by underground workings and drill holes both of which locally exceed 1 km depth. Many of the mine-scale thrust faults are imaged as reflectors but conformable and intrusive contacts generally responded poorly. A significant shallow-dipping thrust, the Powerline Fault, is recognized below the orebodies and traced throughout the Buchans area, primarily as a result of the seismic survey. It truncates ore stratigraphy and forms the floor thrust of a large duplex–stack, which hosts all the orebodies. Its presence has negative implications for exploration in the immediate mine area. Several lines of evidence suggest that this fault has a significant component of out-of-sequence movement. A strong reflector 4.5 km below Buchans is correlated with the surface expression of the Victoria River Delta Fault, an important regional structure, newly recognized southeast of Red Indian Lake. This shallow, north-dipping sole thrust forms the structural base of the Buchans Group and brings it above a younger fossiliferous Llanvirn volcanic sequence. This fault is not itself the Red Indian Line but is one of a series of faults that collectively effect substantial geological contrasts in central Newfoundland. The seismic survey was a cost-efficient means of gaining knowledge of Buchans structure, which might otherwise have been acquired at much higher cost and over a longer period of time.

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