INFLUENCE OF TECTONIC-THERMAL PROCESS ON COALIFICATION

摘要

The coal is an organic rock which is very sensitive to geological factors, such as temperature and pressure (Teichmuler et al., 1966; Stach et al., 1982). Coalification is actually an open system process in which coal exchanges energy and materials with the surrounding environment. During the long process of geologic evolution, all types of tectonic-thermal activities have occurred and inevitably led to diversification of coal in terms of physics, chemistry, textures and structures. Affected by various geologic agents, the organic matter and the inorganic matter in the coal were moved, differentiated and rebuilt (Yang Q, 1996; Han D,1996; Stach et al.,1982; Fowler et al.,1999; Cao Y, et al.,1998). In the process of coalification, both thermal and stress enchanced the evolution degree of organic matter, but the evolution path is different (Petzoukha, 1991; Cao D, et al.,2002; Li X, et at.,2003). Temperature and its thermodynamic action is the basic cause of coalification, and the effect of tectonic stress only increases the evolution velocity of sedimentary organic matter.