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.
出处
《西北大学学报（自然科学版）》
CAS
CSCD
北大核心
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)
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
shale gas
adsorbed gas
adsorption potential theory
adsorption characteristic curves
saturationabsorptive capacity
