Abstract: A dynamic equilibrium kinetic model for describing geological evolution history of coalbed methane (CBM) was built,and the relative simulator was programmed in order to study generation,migration,accumulation and emission histories of CBM in Sunan syncline area.The tectonic,burial and thermal history of this area were analyzed.The simulation of CBM evolution history indicated that CBM evolution history in Sunan syncline area could be classified into four stages.In the first and the second stages,CBM was concentrated in low level. In the third stage,gas generation and emission were developed vigorously,and in the forth stage, diffusion emission was the main process.The transverse content of coalbed methane is high in the axis of the syncline and low in the edge at present.

Key words: coalbed methane, geological evolution history, numerical simulation, gas bearing feature, Sunan Syncline area

摘要： 为了查明宿南向斜煤层气生成、运移、聚集和散失的地质演化历程,建立了煤层气地质演化史动态平衡动力学模型,并研制了模拟软件。分析了本区构造史、埋藏史和热演化史,对宿南向斜煤层气演化史进行的模拟计算。结果表明,宿南向斜煤层气地质演化历程可分为煤层气低水平聚集的第一和第二阶段、煤层气大量聚集且散失作用较发育的第三阶段和以散失作用为主的第四阶段。在横向上,煤层现今含气量总体上表现为向斜边缘较低而核部较高的特点。

关键词: 煤层气, 地质演化史, 数值模拟, 含气特征, 宿南向斜地区