川南龙马溪组深层页岩气储层吸附气含量计算方法研究  

Study on the Calculation of Adsorption Gas Content of Longmaxi Formation Deep Shale Reservoir in Southern Sichuan Basin

作　　者：程超[1] 白小军 林海宇 冯磊 夏雨 Cheng Chao;Bai Xiaojun;Lin Haiyu;Feng Lei;Xia Yu(Southwest Petroleum University,Chengdu,Sichuan 610500,China;Yanchang Petroleum Co.,Ltd.,Yan’an,Shaanxi 717208,China)

机构地区：[1]西南石油大学,四川成都610500 [2]延长油田股份有限公司,陕西延安717208

出　　处：《特种油气藏》2018年第4期1-6,共6页Special Oil & Gas Reservoirs

基　　金：国家自然科学基金"页岩气低成本高效钻完井技术基础研究"(U1262209)

摘　　要：针对众多吸附模型的计算原理和适用条件交代不清,对深层页岩吸附量计算适应性差等问题,以页岩气吸附机理为研究基础,分析Langmuir基本模型的局限性,厘清了单分子层吸附模型、多分子层吸附模型和微孔填充模型3类改进模型的计算原理及相互关系,并讨论了各改进模型的优缺点和适用条件。研究认为,黏土矿物大孔及干酪根中孔双组分单层吸附行为和干酪根超微孔以微孔充填形式吸附能较完整地表征深层页岩的物理吸附过程,并由此提出了双L-DA新模型。结果表明,该模型在川南龙马溪组深层页岩吸附量计算结果精度较高。该研究对深层页岩吸附气含量计算具有重要的现实意义。The calculation principles and application conditions of multiple adsorption models are not defined clearly and they are poorly adaptable to calculate adsorptive capacity of deep shale.To solve these problems,the restrictions of Langmuir basic model were analyzed with the adsorption mechanisms of shale gas as the research base.Then,the calculation principles of three modified models(i.e.,monolayer adsorption model,multilayer adsorption model and micropore packing model)and their relations were figured out,and their advantages,disadvantages and application conditions were discussed.It is indicated that physical adsorption process of deep shale can be characterized completely by using the double-composition,single-layer adsorption behavior of large clay mineral pore and moderate kerogen pore and the micropore packing pattern of ultrafine kerogen pore.And accordingly dual L-DA model was proposed.This new model is well applied in calculating adsorptive capacity of Longmaxi Formation deep shale in southern Sichuan Basin.The research is of great practical significance to calculate the adsorption gas content of deep shale.

关 键 词：吸附模型 吸附机理 改进模型 适用条件 深层超临界页岩气 龙马溪组 

分 类 号：TE122.1[石油与天然气工程—油气勘探]