Controlling Effects of Surrounding Rock to Coal Seam Gas Occurrence

Laibin Wang, Shiwen Zhang, Jinshan Shen, Zhongwen Zhang, Xiaotong Yang

College of Earth & Environment, Anhui University of Science & Technology, Huainan, China.

DOI: 10.4236/ojg.2013.31004                

Abstract

Surrounding rock of coal seam was one of the important factors to gas occurrence. The coal seam gas occurrence was studied by the index of roof strata thickness or sand content rate; we found that there were certain shortcomings. In order to reasonably evaluate the influence of coal seam surrounding rock on gas occurrence in Panji mining area, we quantitatively evaluated the effect of coal seam surrounding rock on gas occurrence by influence coefficient of roof strata thickness, and built six mathematical models of the variational gas content in the mining area which is divided into six gas geological units. The results shows that the coal seam gas content is mainly influenced by 20 mroof strata in each gas geological unit, the gas content presents the tendency of increase, and with the influence coefficient of strata thickness increases, they exist a significant linear relationship.

Keywords

Panji Mining Area; Surrounding Rock of Coal Seam; Gas Occurrence; Influence Coefficient of Coal Seam Roof Strata Thickness

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Y. F. Yao, X. C. Li, Y. Z. Zhou, N. Hao, K. Y. Liu and M. Y. Zhang, “The Effect of Coal Bed Surrounding Rock in Exploration and Development of Coal Bed Gas,” Well Testing, Vol. 8, No. 1, 1999, pp. 41-44.
[2]	Q. X. Yu, “Mine Gas Prevention and Control,” China University of Mining and Technology Press, Xuzhou, 1992, pp. 1-19.
[3]	Z. M. Zhang, “Gas Geology,” China University of Mining and Technology Press, Xuzhou, 2009, pp. 240-242.
[4]	E. Y. Wang and Q. C. Yin, “Application of Deciding the Value of Coal Seam Roof Strata Thickness in Calculating Sand Content Rate,” Journal of HeNan Polytechnic University (Natural Science), Vol. 27, No. 1, 2008, pp. 40-43.
[5]	S. C. Yin, Y. L. Zhao and H. Q. Wang, “Analysis on Rock Mass Structure Affecting Coal Seam Gas Occurrence,” Zhongzhou Coal, No. 3, 2009, pp. 24-26.
[6]	E. Y. Wang, “Lithologic Structure Analysis in Coal-Seam Fault Formation,” Journal of China Coal Society, Vol. 30, No. 3, 2005, pp. 319-321.
[7]	L. W. Yang, “Application Gas Geological Division in Controlling Coal and Gas Outburst,” The Chinese Journal of Geological Hazard and Control, Vol. 8, No. 3, 1997, pp. 21-25.
[8]	Y. X. Cao, “Nowledge and Practice for Prediction of Gas Outburst by Gas Geological Unit Methods,” Journal of China Coal Society, Vol. 20, Supplementary Issue, 1995, pp. 76-78.
[9]	Y. C. Lv, J. H. Hu, M. Zhao and Z. Gao, “Outburst Regional Prediction Based on Delineation of Gas-Geological Unit,” Journal of HeNan Polytechnic University (Natural Science), Vol. 29, No. 6, 2010, pp. 715-719.
[10]	D. F. Yang, Z. M. Zhang, Y. G. Zhang and G. Xu, “Research the Gas Deposit Law Based On Delineation Gas-Geological Unit-Take B2 Seam in Xuehu Coalmine as an Example,” Journal of HeNan Polytechnic University (Natural Science), Vol. 27, No. 4, 2008, pp. 386-390.
[11]	Y. F. Lu, P. Chen and X. Y. Tang, “Characteristics of Gas Content of No.13-1 Coalbed in Panyi Coal Mine of Huainan Field,” Coal Geology & Exploration, Vol. 34, No. 2, 2006, pp. 29-32.
[12]	L. B. Wang, Y. G. Shu, J. S. Shen and X. Q. Gao, “Analysis of Regularity and It’s Influencing Factors of Gas Occurrence in Seam 13-1 of Pansan Mine,” China Coal, Vol. 37, No. 5, 2011, pp. 47-50.