Geological guarantee for in-situ development of coal
Under the"dual carbon"target,faced with the resource endowment characteristics of"short-age of oil,scarcity of gas,and relative abundance of coal",coal still occupies a dominant position in China's primary energy sector for a certain period.And it is imperative to develop the low-carbon and clean transformation of coal.Underground in-situ pyrolysis,gasification,dry distillation,hydrogen pro-duction and other methods are expected to become important approaches for future coal development.At present,there have been many explorations on in-situ coal development,but the geological safety,reliability,and environmental protection of geological site selection and development process are still scientific challenges that constrain its scale and commercialization.Therefore,the theoretical and tech-nical research on geological guarantee for in-situ coal development needs to be deepened urgently.Ad-hering to the principles of"safety,economy,environmental protection,and sustainability",this paper analyzes the current research status of coal in-situ development,starting from the characteristics of coal resource endowment and geological conditions.Based on the scientific concept of the entire life cycle of coal development,the scientific connotation of"geological guarantee for coal in-situ development"is proposed.By identifying pre-mining geological conditions,the response characteristics and damage laws of surrounding rock geological bodies during the deep in-situ development process are revealed from the perspective of physical mechanisms,clarify the geological and mechanical behavior of rock mass engi-neering in in-situ development,construct a dynamic evaluation model for geological conditions in in-situ development,form a loss reduction guarantee strategy and method for in-situ development,and propose ways to reuse in-situ development space.Taking two development models of underground coal gasifica-tion and underground pyrolysis as examples,this paper elaborates on the phased nature of in-situ devel-opment,clarifies the geological conditions elements of in-situ Development Zone design,emphasizes re-al-time dynamic monitoring and evaluation of surrounding rock geological response during the develop-ment process to ensure the sealing and safety of the development zone,and achieves the evaluation of geological conditions'spatiotemporal evolution and geological risk controllability.In addition,the em-phasis is placed on collaborative development of deep thermal energy and co-associated resources,a-chieving the utilization of residual resources and the reuse of underground space.The research on in-si-tu geological guarantee of coal reflects the requirements of resource occurrence conditions,geological environment constraints,in-situ development technology,geological risk prevention and control,and re-source collaborative development.It attaches importance on the changes in geological conditions under in-situ disturbance conditions,emphasizes the overall study of development disturbance and geological body structure,and recognizes the multiphase field coupling damage mechanism in the field of spatio-temporal effects of in-situ development.To reveal the geological risk mode under the disturbance effect of in-situ development from a multi layer perspective,and to identify the contradiction between resource development and geological environmental constraints has important theoretical and practical guiding significance for promoting low-carbon coal development in the future and achieving high-quality devel-opment of the coal industry.
万方数据
维普
