煤油气共生矿井易发生围岩瓦斯涌出波动范围大、异常涌出现象，从底板涌出尤为严重，且具有突发性、隐蔽性和涌出量大等特点，成为影响矿井安全高效开采新的致灾因素。初步研究表明，异常涌出气体与煤层气不同，其成因类型为油型气。针对煤油气共生矿井，选择对掘进工作面油型气涌出进行数值模拟，对比分析掘进工作面的风流流场及油型气主要成分CH4的扩散规律，为煤油气共生矿井油型气治理提供依据。 本文以计算流体动力学为理论基础，根据黄陵油型气涌出矿井掘进巷道参数及瓦斯、油型气涌出情况，运用ANSYS软件建立了压入式通风条件下，掘进工作面的物理模型及数学模型。根据现场数据，合理计算给定边界条件。采用Realizable - 双方程模型和壁面函数法对掘进工作面风流流场进行描述，并对压入式通风条件下，掘进工作面油型气涌出扩散过程进行了数值模拟，得出了油型气涌出时CH4扩散规律。在模型可信的基础上，研究了相同涌出量、不同位置涌出点CH4的扩散规律；油型气以不同涌出量涌出的CH4的扩散规律及CH4浓度分布规律；分析了相同涌出量、同一位置涌出点不同涌出形状的CH4扩散规律；分析了风筒布置对油型气扩散的影响；模拟并讨论了增加供风量对排出油型气中CH4的有效性。 数值模拟计算结果表明：扩散稳定后CH4在巷道断面的浓度分布特点，将涌出点位置分为四个区域。油型气涌出量增加，涌出稳定后巷道各个位置的CH4浓度会有相应的增加，且在巷道下部和上部增加的量几乎相同。油型气从裂隙中涌出时，裂隙平行或垂直于掘进方向，对风排油型气不利。风筒布置在顶部更有利于排出三区涌出点的油型气，二区受风筒布置的影响不大。在一定范围内增大供风量对排出油型气很有效，尤其是涌出点在四区时，但这一方法具有局限性。风流流场对油型气扩散有本质影响，风速越大，巷道上部CH4浓度越小。

Oil gas association mining area is more likely to occuring large fluctuation range of gas emission in surrounding rock, which is particularly serious emission from the bottom. The phenomenon has the characteristics of sudden, concealment and emission too much etc, becoming the new disaster causing factors affected to the mine safety and high efficiency mining. Preliminary studies suggest that abnormal emission, different from gas and coal seam gas, genetic types of oil type gas. In the light of the oil gas association mine, heading face gas emission for numerical simulation been choosed. Comparison and analysis of main components of the diffusion rule of CH4 tunneling working surface air flow field and oil type gas to provide the basis for the oil and gas symbiotic mine oil type gas treatment. According to the actual conditions of laneway airflow and flowfield distribution, physical and mathematical models of airflow field in forced ventilation were established on the basis of jet theories, aerodynamics, fluid mechanics and computational fluid dynamics by software fluent, boundary conditions were also confirmed. Laneway airflow was described by Realizable - model and wall functions, so flowfield distribution and jet velocity variation were obtained through numerical simulation on the process of laneway forced ventilation. On the basis of credible numerical simulation, flowfield variation and distribution of CH4 concentration were studied through different variable of emission location, flux, cylinder position. The effects of these influencing factors on CH4 diffusion were obtained. The numerical simulation results show that: the emission point is divided into four areas according to character of CH4 in diffusion concentration in tunnel. CH4 concentration arrangement conducive to the discharge of oil type gas in the top of the more. Emission point for the cracks perpendicular or parallel to the driving direction is not conducive to been expelled. Increasing the amount of oil type gas gush, gush is stable after CH4 concentration of each position of the tunnel will be a corresponding increased, and the increase degree obey the strict proportion. In a certain range of air supply is effective to increase the discharge of oil type gas, especially the emission point in the third section, but this approach has limitations, the amount of exhaust gas will no longer increase beyond a certain value. Flow field has an essential influence on oil type gas diffusion, the greater the wind speed, the smaller CH4 concentration in the top of tunnel.