Research into selection evaluation system on co-mining of “the three gas” in coal series stratum

Abstract

Along with the continuously go deep into of the research on coal series stratum, unconventional coal-derived gas gets more attention, including coalbed methane, shale gas and tight sandstone gas. However, selection evaluation as the basis and prerequisite for the exploration and development of unconventional coal-derived gas has great significance. The purpose of this paper is to set up a selection evaluation system, and this system is called selection evaluation on co-mining of “the three gas” in coal series stratum. If a basin exists these three gases at the same time, then we can use this evaluation system to evaluate this type of basin and choose dessert area, finally, for co-mining of “the three gas” in coal series stratum provide guidance. By choosing the main control factors of coalbed methane, shale gas and tight sandstone gas, and based on fuzzy mathematics, analytic hierarchy process theory and multi-level fuzzy comprehensive evaluation theory to research selection evaluation system on co-mining of “the three gas” in coal series stratum. Finally, 26 main control factors are selected, and then the index system is set up; in addition, by calculating the weight and establishing the membership function and evaluation set, and then selection evaluation system on co-mining of “the three gas” in coal series stratum with a four layer index is established. This paper can provide a theoretical basis and engineering guidance for unconventional gas exploration and development.

Keywords

Geological engineering / Selection evaluation system / Multi-level fuzzy mathematics / “The three gas” in coal series stratum

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