超饱和煤层气成藏机理研究及模拟试验

Research and Simulation of the Formation Mechanism of Over Saturated Coalbed Methane Reservoir

超饱和煤层气藏就是煤层的含气量超过煤层的吸附能力的煤层气藏。根据大量的试验研究和具体煤层气的成藏条件及成藏模式进行分析,提出了四种超饱和煤层气藏的成藏模式:构造抬升压力自解吸形超饱和煤层气藏、构造下降温度自解吸形超饱和煤层气藏、它生气源补给超饱和煤层气藏及岩浆岩烘烤温度自解吸超饱和煤层气藏,提出了超饱和煤层气藏对煤层气藏的勘探开发的意义。

Over saturated coalbed methane reservoir is a kind of coalbed methane reservoir in which the gas constant exceeds the gas adsorption capability in coal. From experiments and analysis of formation conditions and modes of coalbed methane, four formation modes of over saturated coalbed methane reservoir are advanced, they are: the over saturated coalbed methane reservoir formed due to decreasing of pressure caused by tectonic movement; the over saturated coalbed methane reservoir formed due to increasing of temperature caused by tectonic movement; the over saturated coalbed methane reservoir whose gas was supplied by other reservoirs; and the over saturated coalbed methane reservoir formed due to magmatic rock. Significance of over saturated coalbed methane reservoir for the exploration and exploitation of coalbed methane is also pointed out.