scholarly journals Determination between transmission wave field of in-seam seismic survey and thickness of coal seam

2016 ◽  
Author(s):  
Songying Li ◽  
Jie Lian ◽  
Xiaoshuai Yao ◽  
Kang Wang ◽  
Jiwen Teng ◽  
...  
Keyword(s):  
Coal Seam ◽  
Wave Field ◽  
Seismic Survey

Preliminary study on wave field and dispersion characteristics of channel waves in VTI coal seam media

2019 ◽  
Vol 67 (5) ◽  
pp. 1379-1390
Author(s):  
Guangzhong Ji ◽  
Hui Li ◽  
Jiuchuan Wei ◽  
Sitong Yang
Keyword(s):  
Coal Seam ◽  
Wave Field ◽  
Dispersion Characteristics ◽  
Preliminary Study

Research and Application of In‐seam Seismic Survey Technology for Disaster‐causing Potential Geology Anomalous Body in Coal Seam

2020 ◽  
Vol 94 (1) ◽  
pp. 10-26
Author(s):  
Jiwen TENG ◽  
Songying LI ◽  
Mingkui JIA ◽  
Jie LIAN ◽  
Honglei LIU ◽  
...  
Keyword(s):  
Coal Seam ◽  
Seismic Survey ◽  
Anomalous Body

Seismic Record Simulation of the Coalbed in HTI Media

2011 ◽  
Vol 393-395 ◽  
pp. 935-938
Author(s):  
Yi Chen Zhao ◽  
Hui Wang ◽  
Yan Sun
Keyword(s):  
Coal Seam ◽  
Wave Field ◽  
Single Shot ◽  
Fracture Detection ◽  
Seismic Record ◽  
Element Simulation ◽  
Hti Media ◽  
Component Wave ◽  
Anisotropic Elastic ◽  
Hti Medium

This paper uses the finite element simulation system of the anisotropic elastic wave to simulate the two component wave field characteristics of the HTI medium in the coal-seam with fractures. The simulation results of the single shot record indicate that when the coal-seam contains fracture. The wave field characteristics under different fracture parameters are observed through the single shot record. The influences can be found mainly in the energy and amplitude vers offset characteristics. The characteristics of x component and z component are different. This may provide some experimental references to fracture detection using the PS-wave.

Wave Field Characteristics of Small Faults around the Loose Circle of Rock Surrounding a Coal Roadway

2020 ◽  
Vol 25 (2) ◽  
pp. 245-254 ◽  
Author(s):  
Bo Wang ◽  
Huachao Sun ◽  
Lanying Huang ◽  
Shengdong Liu ◽  
Biao Jin ◽  
...  
Keyword(s):  
Coal Seam ◽  
Wave Field ◽  
Love Wave ◽  
The Body ◽  
Body Waves ◽  
Seismic Record ◽  
Coal Roadway ◽  
Geological Conditions ◽  
Small Fault ◽  
Channel Wave

The geological conditions of coal roadway excavation are complicated. Seismic advanced detection is strongly influenced by the loose circle of fractured rock surrounding the competent coal seam. However, the three-dimensional wave field characteristics of small fault advanced detection in the condition of the loose circle of coal roadway have not examined. In this paper, numerical modeling and field tests were conducted to address this knowledge gap. The results indicate that when a seismic source near the tunnel face is excited, the body waves and a Love channel wave propagate in the tunneling direction toward the small fault, then produces reflected body waves whose amplitude is relatively weak, and a reflected Love channel wave whose amplitude is relatively strong. When reflected body waves and the reflected Love channel wave enter the loose circle of surrounding rock, the former's signal is unrecognizable in seismic record; but the latter converts to a Love wave whose amplitude is strong in the loose circle of coal seam. The Love wave which has a large interval from other wave trains in the time domain is easily recognizable in seismic record, which makes it suitable for advanced detection of small fault. The signal-to-noise ratio of seismic record of X component is higher than those of Y component and Z component.

Phosphorus minerals in tonstein; coal seam 405 at Sośnica-Makoszowy coal mine, Upper Silesia, southern Poland

2013 ◽  
Vol 63 (2) ◽  
pp. 271-281 ◽  
Author(s):  
Magdalena Kokowska-Pawłowska ◽  
Jacek Nowak
Keyword(s):  
Trace Elements ◽  
Coal Seam ◽  
Mineral Composition ◽  
Coal Mine ◽  
Chemical Compositions ◽  
Coal Basin ◽  
Upper Silesia ◽  
Southern Poland ◽  
Basin Area

Abstract Kokowska-Pawłowska, M. and Nowak, J. 2013. Phosphorus minerals in tonstein; coal seam 405 at Sośnica- Makoszowy coal mine, Upper Silesia, southern Poland. Acta Geologica Polonica, 63 (2), 271-281. Warszawa. The paper presents results of research on tonstein, which constitutes an interburden in coal seam 405 at the Sośnica- Makoszowy coal mine, Makoszowy field (mining level 600 m), Upper Silesia, southern Poland. The mineral and chemical compositions of the tonstein differ from the typical compositions described earlier for tonsteins from Upper Silesia Coal Basin area. Additionally, minerals present in the tonsteins include kaolinite, quartz, kaolinitised biotite and feldspars. The presence of the phosphatic minerals apatite and goyazite has been recognized. The presence of gorceixite and crandallite is also possible. The contents of CaO (5.66 wt%) and P2O5 (6.2 wt%) are remarkably high. Analysis of selected trace elements demonstrated high contents of Sr (4937 ppm) and Ba (4300 ppm), related to the phosphatic minerals. On the basis of mineral composition the tonstein has been identified as a crystalline tonstein, transitional to a multiplied one.

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