【摘要】 在深入研究地层孔隙水中含气浓度及其影响因素的基础上，分析了欠压实泥质源岩中异常含气浓度的影响因素。利用异常孔隙流体压力和异常温度建立了欠压实泥质源岩异常含气浓度的计算公式，并将其应用于松辽盆地三肇凹陷青山口组泥质源岩异常含气浓度的计算中，结果表明该区青山口组泥岩具有0．5～0．8m3／m3的异常含气浓度，对下伏扶、扬油层中的扩散相天然气具有强的封闭能力。表明该方法用于研究欠压实泥质源岩的异常含气浓度具有可行性，它不仅考虑了异常孔隙流体压力的影响，而且还考虑了异常温度的影响，较以往的研究方法更切实际。更多还原

【Abstract】 Based on studying the gas concentration of formation water and its influencing factors, this paper analyses the factors influencing abnormal gas concentration of uncompacted mudstone sourcerock. The formula of calculating the abnormal gas concentration of the sourcerock is derived by abnormal pore fluid pressure and abnormal temperature. It was used to talculate the abnormal gas concentration of Qingshankou Formation’s uncompacted mudstone in Sanzhao depression, Songliao Basin. The result indicates that the concentration is 0. 5 ~0. 8 m3/m3, which can form strong sealing ability to the natural gas in diffusion phase in underlying F. Y oil layer. So the method is practical to determine the abnormal gas concenration of uncompacted mudstone. It indicates not only the influence of abnormal pore fluid pressure, but the abnormal temperature, being more pratical than the former methods.更多还原