为获得高演化富有机质页岩地层条件下的准确吸附气量,选取川南龙马溪组高演化海相富有机质页岩样品,开展甲烷等温吸附与扫描电镜等实验,提出一种考虑地层含水条件下,不同吸附介质的吸附气量计算新方法。通过对有机质吸附分数进行校正,将地层条件下页岩所有孔隙表面的总吸附气量折算为仅在有机质孔隙表面吸附的有机质吸附气量。研究结果表明:由校正后的有机质吸附气量计算所得含气量与现场实测含气量基本一致,且随有机质含量的增加,有机质吸附气量与页岩总吸附气量间的差值逐渐减小,说明校正后的有机质吸附气量符合地层条件下高演化富有机质页岩实际的甲烷吸附模式。该方法可为页岩储层的地层条件下吸附气量计算提供依据。
In order to work out the accurate amount of adsorbed gas in the highly evolved shale formation with rich organic matters, a new method was proposed to calculate the amount of adsorbed gas with different adsorption media considering formation water content after conducting isothermal methane adsorption and scanning electron microscopy experiments on highly evolved marine shale samples with rich organic matters from Longmaxi Formation, Southern Sichuan. Through the correction of organic matter adsorption fraction, the total amount of adsorbed gas on all pore surfaces of shale under stratigraphic conditions was converted into the amount of gas adsorbed by organic matters only on the organic matter pore surface. The results of the study show that the gas content calculated from the corrected amount of gas adsorbed by organic matters was basically consistent with the measured gas content on site. With the increase of organic matter content, the difference between the amount of gas adsorbed by organic matters and the total adsorbed gas amount of shale was decreased gradually, indicating that the corrected amount of gas absorbed by organic matters conforms to the actual methane adsorption model of the highly evolved shale formations with rich organic matters under stratigraphic conditions. This method can provide a basis for the calculation of adsorbed gas amount under the stratigraphic conditions of shale reservoirs.
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