鄂尔多斯盆地长7油层组页岩吸附特征与类型及吸附气量影响因素  

Adsorption characteristics,types and influencing factors of Chang 7 shale of Triassic Yanchang Formation in Ordos Basin

作　　者：寇雨 周文[1] 赵毅楠 陈文玲[1] 李娜[1] 徐浩[1] 

机构地区：[1]油气藏地质及开发工程国家重点实验室(成都理工大学),成都610059

出　　处：《岩性油气藏》2016年第6期52-57,共6页Lithologic Reservoirs

基　　金：国家高技术研究发展计划(863计划)项目"页岩气钻完井及储层评价与产能预测技术研究"(编号:2013AA064501)资助

摘　　要：页岩理论吸附气量是判断页岩是否具有经济开采价值的重要指标,因此研究页岩等温吸附特性与类型、计算页岩理论吸附气量对页岩含气性评价具有重要意义。为了研究鄂尔多斯盆地延长组陆相页岩的等温吸附特性,选取长7油层组8块页岩样品进行了高温、高压甲烷等温吸附实验,根据得到的等温吸附曲线特征,计算了其理论吸附气量与吸附热,判断了其吸附类型并分析了影响其理论吸附气量的主要因素。结果表明：鄂尔多斯盆地长7油层组8块页岩样品的等温吸附结果符合Langmuir吸附特征;计算出页岩样品的理论吸附气质量体积为0.57~4.35 m^3/t,平均为1.98 m^3/t;计算得到页岩样品的吸附热为10.67~37.67 k J/mol,平均为21.73 k J/mol,由此判断其吸附类型为物理吸附;长7油层组陆相页岩理论吸附气量主要受比表面积、有机碳含量及黏土矿物含量的影响,其中比表面积为最直接的影响因素。The theoretical absorption gas amount in shale is an important index to judge whether shale has economic exploitation value. It is significant for shale gas-bearing property evaluation to study isothermal adsorption features of shale and calculate shale adsorption capacity. In order to find the isothermal adsorption features of Chang 7 shale in Ordos Basin, eight shale samples of Chang 7 were selected to carry out high temperature and high pressure methane isothermal adsorption experiments, then the adsorption gas content and adsorption heat were calculated according to the isothermal adsorption characteristic curves, and its influencing factors were analyzed. The results show that the isothermal adsorption of the eight samples from Chang 7 shale is in accord with Langmuir adsorption theory. The theoretical adsorption gas content of the eight shale samples is 0.57-4.35 m^3/t, with an average value of 1.98 m^3/t. The adsorption heat of Chang 7 shale samples is 10.67-37.67 kJ/mol, the average value is 21.73 kJ/mol, therefore, its adsorption type is physical adsorption. The shale adsorption gas content is mainly affected by specific surface area, TOC content and clay mineral content, among which the specific surface area is the most direct influencing factor.

关 键 词：陆相页岩 吸附特性 影响因素 长7油层组 鄂尔多斯盆地 

分 类 号：TE121.2[石油与天然气工程—油气勘探]