Abstract: On the basis of analyzing the structure of the earth and rock sphere and the generation and transmission of geothermal heat flow, the authors of this paper firstly probe the condition of thermal fluid sustainable movement. And then, according to the relationship among lithology, unconformity, fault and thermal fluid movement, thermal fluid movement is classified into three types, including lateral migration, vertical migration and composite migration. And trace markers of the thermal fluid movement including vitrinite reflectance, fluid inclusion, evolution of authegenic minerals, color of sporopollen, apatite fission track and so on are analyzed. And lastly, the influence of thermal fluid movement on evolution of organic matter, hydrocarbon migration and reservoirs is discussed. It is pointed out that thermal fluid movement can accelerate hydrocarbon generation, improve the efficiency of hydrocarbon immigration, provide the dynamic and pathway for hydrocarbon migration, and improve the physical properties of reservoirs in deep zone and worsen the physical properties of reservoirs in shallow zone usually.

Key words: thermal fluid, trace marker, Ro, migration type, hydrocarbon accumulation