Abstract:

The unclear understanding of the gas occurrence rule is the fundamental reason of frequent gas outburst disaster. Based on stepwise tectonic control theory of gas occurrence, and combined with datum of Guizhou Province gasgeology map, the tectonic level control rule and zoning division of gas occurrence have been discussed. The results show that Guizhou Province is located in the copulae of the circumPacific tectonic tract and the western Tethyan tectonic domain, and its tectonic evolution controlled the coalforming environments and gas occurrence. During Yanshan movement, a series of folds, overthrust fault and nappe tectonics formed, then resulting in the tectonic coal developed; those were the primary reason of serious coal and gas outburst in Guizhou Province. Moreover, Yanshanian magmatism increased coal metamorphism and hydrocarbon productivity was enhanced. Coalmine gas occurrence and distribution in Guizhou Province were divided into four zones, namely Liupanshui, ZhinaLiuzhiGuiyangbei and northern Guizhou province three high and outburst gas zones and eastern Guizhou province gas zone.

Key words: gas occurrence, tectonic control, tectonic evolution, gasgeology map, zoning division of gas occurrence