酸气-咸水作用下岩石特异性破坏机理研究

项目名称： 酸气-咸水作用下岩石特异性破坏机理研究

项目编号： No.41274111

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 李琦

作者单位： 中国科学院武汉岩土力学研究所

项目金额： 80万元

中文摘要： 酸气回注是指将天然气等中分离出来的酸性气体（通常是CO2和H2S）通 过井孔注入地下长期封存以减少排放的过程。随着硫磺价格下降和各国对酸气排放规制的增 强，酸气回注逐步走向工程化，具有显著的应用前景。加拿大已经开展过40多个酸气回注项目，而我国尚无先例。 酸气回注必须回答地质封存的力学稳定性问题。针对酸气-咸水作用下的岩石特异性破坏机理及耦合过程研究，目前普遍缺乏实验的系统验证的前提下，本项目通过使用开发的酸气和咸水作用下岩石流通-反应三轴试验仪，开展在不同酸气组分和不同压力下的室内岩石三轴破坏实验研究；有别于损伤模型，提出考虑饱和度和压力的岩石特异性破坏行为的本构关系，同时通过力学-化学-多相渗流耦合软件的二次开发，模拟试样尺度下酸气回注过程中这一特异性力学行为的演化规律。

中文关键词： 酸气回注；声发射；波速成像；岩石破坏；耦合过程

英文摘要： The acid gas reinjection refers to injection of captured of acid gases (usually CO2 and H2S) from large sources of emissions through the pipe and the borehole into the underground non-productive or non-economic formations. With the severe fluctuation of sulfur market and the worldwide enhancement on the regulation of acid gas emissions, acid gas re-injection is an alternative to large-scale producers to deal with excess sulfur. At the same time, the acid gas re-injection can reduce the atmospheric emissions of carbon dioxide and sulfur dioxide, so acid gas re-injection is an option of carbon capture and storage, and it is also a promising technology to mitigate acid rain worldwide. Up to now, Canada has been carried out over 40 acid gas reinjection projects, while China is no precedent. But recently some large state-owned enterprises including CNPC are in the pipeline to carry out relevant acid gas reinjection projects. The proposed application aims to build a strong constitutive relationship for the mechanical behavior of rock under coupled acid-gas and saline water conditions. The updated core flooding apparatus with reactive flow and tri-axial deformation is used to investigate the evolution of the specific mechanical behavior of rock under the acid gases and saline water. By integrated the proposed constitut

英文关键词： Acid gas injection；Acoustic emission；Velocity tomography；Rock failure；Coupling process