Abstract
Effective migration system of coalbed methane (CBM) reservoir, which was controlled by development degree and opening-closing degree of fractures, determines the permeability of coal reservoir and can be characterized by the pore-fracture system in the extrinsic form. In this paper, based on coal matrix elastic self-regulating effect theory and coal reservoir combined elastic energy theory, the fracture opening-closing degree parameter Δ and the fracture development degree parameter ξ are suggested for the quantitative study of the effective migration system of CBM reservoir in southern Qinshui Basin. Further, the control functions of ξ and Δ to CBM enrichment and high production are discussed. The results show that in present stage the area with high ξ value is located in Anze and Qinyuan, and then Zhengzhuang and Fangzhuang, where fracture development degree is high. The area with high Δ value is located in Zhengzhuang and Fanzhuang, and then Anze and Qinyuan, indicating where coal matrix elastic self-regulating positive effect dominates and fractures tend to be open. Through the comprehensive analysis on ξ and Δ, it can be found that their best match area is located in Zhengzhuang and Fanzhuang, with high values for fracture development degree and opening-closing degree probably bringing about high fluid pressure and good permeability of reservoirs, which are advantageous to an abundant CBM production.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Abdullah M, Al Qahtani, Saudi Aramco. 2001. A new technique and field application for determining reservoir characteristics from well performance data. In: SPE Middle East Oil Show. Bahrain: Society of Petroleum Engineers. 68–77
Amyx J M, Bass D M, Whiting R. 1960. Petroleum Reservoir Engineering-Physical Properties. New York: Mc-Graw-Hill Book Company. 8–97
Chen J G. 2003. Control law and mechanism of structure and drainage-gas production to high rank coal’s permeability (in Chinese). Doctoral Dissertation. Xuzhou: China University of Mining & Technology. 72–115
Fu X H. 2001. Physical and numerical simulation of physical properties of multiphase medium coal rocks or reservoirs (in Chinese). Doctoral Dissertation. Xuzhou: China University of Mining & Technology. 66–78
Gash B H, Volz R F, Potler G, et al. 1993. The effect of cleat orientation and confining pressure on cleat porosity, permeability and relative permeability in coal. In: Proceedings of the 1993 International Coalbed Methane Symposium. 221–230
Geonge J D, Barakat M A. 2001. The change in effective stress associated with shrinkage from gas desorption in coal. Int J Coal Geol, 45: 105–113
Harpalani S, Shraufnagel R A. 1990. Shrinkage of coal matrix with release of gas and its impact on permeability of coal. Fuel, 69: 551–556
Jiang W, Wu C F. 2011. Flexibility energy of coal-bed gas reservoir in Zhina coalfield and their control function on the favourable areas (in Chinese). J Chin Coal Soc, 36: 1474–1678
Purl R, Evanoff J C, Brugler M L. 1991. Measurement of coal cleat porosity and relative permeability characteristics. In: SPE Gas Technology Symposium. Texas: Society of Petroleum Engineers. 21–33
Qin Y. 2003. Advance and reviews on research of coalbed gas geology in China (in Chinese). Geol J Chin Univ, 9: 339–358
Qin Y, Fu X H, Wu C F, et al. 2005. Self-adjusted elastic action and its CBM pool-forming effect of the high rank coal reservoir. Chin Sci Bull, 50(S1): 99–103
Qin Y, Zhang D M, Fu X H, et al. 1999. A discussion on correlation of modern tectonic stress field to physical properties of coal reservoirs in central and southern Qinshui Basin (in Chinese). Geol Rev, 45: 576–583
Wu C F. 2004. Energy homestasis and its geological selective process of coalbed gas reservoir formation (in Chinese). Doctoral Dissertation. Xuzhou: China University of Mining & Technology. 31–119
Wu C F, Qin Y. 2012. Flexibility energies of coal-bed reservoir and the controlling function on coal-bed gas reservoir formation: A case study from Qinshui Basin (in Chinese). Earth Sci Front, 19: 248–255
Wu C F, Qin Y, Fu X H. 2007. Stratum energy of coal-bed gas reservoir and their control on the coal-bed gas reservoir formation. Sci China Ser D-Earth Sci, 50: 1319–1326
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Wu, C., Qin, Y. & Zhou, L. Effective migration system of coalbed methane reservoirs in the southern Qinshui Basin. Sci. China Earth Sci. 57, 2978–2984 (2014). https://doi.org/10.1007/s11430-014-4988-z
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11430-014-4988-z