南华北盆地中牟—温县区块上古生界页岩气吸附特性
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摘要
为研究南华北盆地中牟—温县地区上古生界山西组—太原组页岩气吸附特征及其主控因素,开展了等温吸附实验,并建立了温-压吸附综合预测模型。结果表明:①上古生界太原组页岩兰氏体积高,吸附能力强,但山西组页岩兰氏压力高,更有利于页岩气脱附解吸;②页岩吸附气量与埋深呈正相关关系,与含水率呈负相关关系,主要受控于深埋作用下的温压条件及相态传质作用;③温度对页岩吸附能力影响显著,温度升高可导致吸附气质量体积和兰氏体积衰减系数下降,但当埋深大于3 731 m时,温度对吸附量的控制作用明显减弱,而深埋条件下兰氏压力较大,使得降压解吸过程中高压段更利于甲烷解吸。因此,研究区北部深层(埋深> 3 500 m)页岩气仍然具有较大的开采潜力。该研究成果对深层页岩气勘探具有一定的指导意义。
In order to study the characteristics of shale gas adsorption and its main controlling factors of Upper Paleozoic Shanxi-Taiyuan Formation in Zhongmou-Wenxian block of South North China Basin,a comprehensive prediction model of temperature-pressure adsorption was established based on the isothermal adsorption experiment of shale gas. The results show that:(1)Taiyuan shale with high Langmuir volume has stronger adsorption capacity compared with Shanxi shale,but Shanxi shale with higher Langmuir pressure is more conducive to shale gas desorption.(2)The buried depth and water content of shale are positively and negatively correlated with adsorbed gas content,respectively,which may be mainly controlled by temperature and pressure conditions and mass transfer in phase change.(3)The increasing temperature can lead to the decrease of adsorption capacity and Langmuir volume attenuation coefficient,reflecting temperature has a significant effect on the adsorption capacity of shale. However,the negative effect of temperature becomes weaker and weaker under deep burial conditions(>3 731 m),and the higher Langmuir pressure under deep burial condition makes the high pressure stage conducive to methane desorption in the depressurization process. Therefore,the deep shale gas(>3 500 m)in the northern part of the study area still has good exploitation potential. The research results have certain guiding significance for deep shale gas exploration.
In order to study the characteristics of shale gas adsorption and its main controlling factors of Upper Paleozoic Shanxi-Taiyuan Formation in Zhongmou-Wenxian block of South North China Basin,a comprehensive prediction model of temperature-pressure adsorption was established based on the isothermal adsorption experiment of shale gas. The results show that:(1)Taiyuan shale with high Langmuir volume has stronger adsorption capacity compared with Shanxi shale,but Shanxi shale with higher Langmuir pressure is more conducive to shale gas desorption.(2)The buried depth and water content of shale are positively and negatively correlated with adsorbed gas content,respectively,which may be mainly controlled by temperature and pressure conditions and mass transfer in phase change.(3)The increasing temperature can lead to the decrease of adsorption capacity and Langmuir volume attenuation coefficient,reflecting temperature has a significant effect on the adsorption capacity of shale. However,the negative effect of temperature becomes weaker and weaker under deep burial conditions(>3 731 m),and the higher Langmuir pressure under deep burial condition makes the high pressure stage conducive to methane desorption in the depressurization process. Therefore,the deep shale gas(>3 500 m)in the northern part of the study area still has good exploitation potential. The research results have certain guiding significance for deep shale gas exploration.
引文
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