利用测井资料研究泥质岩盖层阻止天然气扩散的能力

Studying the ability of mudstone caprock stopping gas diffusion by using log data

大庆石油学院, 安达 151400

Daqing Petroleum Institute,Anda 151400

通过对影响泥质岩盖层阻止天然气扩散能力因素的分析, 认为扩散速度是评价泥质岩盖层自身阻止天然气扩散能力的重要参数。针对实测扩散系数受并点、取心和分析测式等条件的限制, 探讨了利用测井资料研究泥质岩盖层自身阻止天然气扩散能力的方法, 并将其应用于松辽盆地三肇凹陷青山口组泥岩盖层阻止扶、杨油层天然气扩散能力的研究中, 得到该区青山口组泥岩盖层具有较好的阻止天然气扩散的能力, 充分表明它是一种有效的研究泥质岩盖层阻止天然气扩散能力的方法。

Through analyzing the factors of influencing the ability of mudstone caprock stopping gasdiffusion, we think that the diffusion velocity is an important parameter for evaluating the ability.In view of the observed diffusion coefficient restricted by the conditions such as well point, core,and testing, we discuss the method of studying the ability of mudstone caprock stopping gasdiffusion by use of log data. Then the method is utilized in the Qingshankou formation of theSanzhao sag of Songliao Basin. It is concluded that the mudstone caprock in the Qingshankouformation is fairly good for stopping the gas diffusion. This indicates that the method is effectivefor studying the ability of mudstone caprock stopping gas diffusion.