鄂尔多斯盆地富县地区页岩吸附性研究  

Study on shale adsorption in Fuxian area of Ordos Basin

作　　者：陈展 刘友南 CHEN Zhan;LIU Younan(School of Earth Science and Engineering,Xi'an Shiyou University,Xi'an Shaanxi 710065,China;Shaanxi Key Lab of Petroleum AccumulationGeology,Xi'an Shiyou University,Xi'an Shaanxi 710065,China)

机构地区：[1]西安石油大学地球科学与工程学院,陕西西安710065 [2]西安石油大学陕西省油气成藏地质学重点实验室,陕西西安710065

出　　处：《石油化工应用》2023年第10期83-90,共8页Petrochemical Industry Application

摘　　要：随着中国页岩气勘探开发的力度不断加大,为提高页岩气产量降低勘探开发成本,适用于国内页岩的吸附理论亟待完善。以鄂尔多斯盆地富县地区页岩等温吸附实验为依托,在Langmuir模型基础上建立了四参数Langmuir扩展模型,研究发现,页岩对CH_(4)的吸附量受TOC、温度、压力、Tmax共同控制,以此建立的四参数Langmuir扩展模型能够定量预测研究区页岩对CH_(4)的吸附量,精度与Langmuir模型相当,适用范围比Langmuir模型更广。另外,从等量吸附热角度分析可知,研究区页岩对CH_(4)、CO_(2)、N_(2)的吸附量满足CO_(2)>CH_(4)>N_(2),主要是由分子间作用力差距大导致的,与初始等量吸附热大小关系不明显。该研究不仅为研究区页岩对气体吸附量的定量计算提供了新方法,还深入分析了研究区页岩对气体吸附量存在差异的原因,丰富了研究区页岩吸附理论。As China's shale gas exploration and development efforts continue to increase,in order to increase shale gas production and reduce exploration and development costs,the adsorption theory applicable to domestic shale needs to be improved.Based on the isothermal adsorption experiment of shale in the Fuxian area of the Ordos Basin,a four parameter Langmuir extended model is established on the basis of the Langmuir model.The study find that the adsorption amount of CH_(4)by shale is jointly controlled by TOC,temperature,pressure and Tmax.The four parameter Langmuir extended model can quantitatively predict the adsorption amount of CH_(4)by shale in the study area,with accuracy comparable to the Langmuir model,the scope of application is wider than the Langmuir model.In addition,from the perspective of equal heat of adsorption,it can be seen that the adsorption capacity of shale in the study area for CH_(4),CO_(2),and N_(2)meets the requirements of CO_(2)>CH_(4)>N_(2),mainly caused by the large difference in intermolecular forces,and is not significantly related to the initial equal heat of adsorption.This study not only provides a new method for the quantitative calculation of shale gas adsorption capacity in the study area,but also deeply analyzes the reasons for the difference of shale gas adsorption capacity in the study area,enriching the shale adsorption theory in the study area.

关 键 词：鄂尔多斯盆地 等温吸附 Langmuir扩展模型 等量吸附热 

分 类 号：TE122.2[石油与天然气工程—油气勘探]