储层条件下页岩样品吸附潜力预测模型  

The adsorption capacity predicting model of shale gas under doubles variables of temperature and pressure

作　　者：李新[1,2,3] 冀昆[2,3] 方朝强[2,3] 刘鹏[2,3] 李兵[2,3] 

机构地区：[1]西北大学地质学系,陕西西安710069 [2]中国石油集团测井有限公司技术中心,陕西西安710077 [3]中国石油天然气集团公司测井重点实验室,陕西西安710077

出　　处：《西北大学学报（自然科学版）》2015年第3期440-444,共5页Journal of Northwest University（Natural Science Edition）

基　　金：中国石油天然气集团公司科学研究与技术开发基金资助项目(2014A-3914)

摘　　要：合理预测页岩在储层温度和压力条件下的吸附量对于储层描述、资源量的估算具有重要意义,而等温吸附试验下的温度与储层真实温度出入较大。该研究以吸附势理论为基础,构建吸附量随温度压力变化的模型,通过样品在30℃的吸附数据建立的关系模型,理论上可以预测样品在任意温度压力条件下的吸附量。对比60℃和90℃时等温吸附实际数据与该模型预测的吸附量发现:低温下,模型预测的吸附量与实验值较为符合,但压力增高的情况下,模型的精度也随之降低;运用球状模型对最大吸附量进行限定,能较好地纠正高压下的偏差。Calculating the shale＇s adsorption capacity in reservoir＇s temperature and pressure condition has a significant meaning for reservoir description and reserve estimate. The test of shale sample has shown that ad- sorption characteristic curves at different temperature levels are nearly coincidence. Combined with that ad- sorption between shale and methane is physical adsorption, adsorption potential theory can be used here to de- scribe shale＇s adsorption behavior. Then, by using adsorption data at 30℃, the model which can predict ad- sorption capacity at different temperature and pressure is built. By comparing adsorption data which are col- lected at 60℃ and 90℃ using this model, the fact has been founded that the accuracy of this model is becom- ing lower when pressure is higher.

关 键 词：页岩气 吸附气 吸附势理论 吸附特性曲线 饱和吸附量 

分 类 号：TE122.1[石油与天然气工程—油气勘探]