Research On The Environmental Pollution Risk Assessment Model Of Shale Gas Exploitation

Shale gas is an unconventional natural gas,the main component of which is methane,which exists mostly in shale or in shale intercalation.Shale gas is different from conventional natural gas,and is characterized by cleanliness,efficiency and abundant reserves.Shale gas exploration and shale gas exploitation are the main measures to optimize energy structure,achieve energy conservation and reduce emission,and improve the environment.It plays an important role in building a environment-friendly and resource-saving society.However,due to the increase of shale gas development projects in recent years,the risk of environmental pollution caused by drilling process has become an urgent problem.In view of this,this paper studies shale gas mining from the perspective of environmental risk assessment,which is of great practical significance to effectively deal with the environmental pollution risk of shale gas mining and ultimately achieve healthy development.Firstly,the environmental impact of shale gas mining is analyzed,environmental risk factors are screened,and the environmental risk assessment index system is set up by the horizontal and vertical comparison of environmental risk factors.Finally,the risk assessment system of shale gas exploitation environmental pollution is established.By using the method of expert evaluation,the evaluation system of environmental pollution risk is carried out and the judgment matrix is constructed to quantify the index of environmental risk assessment at all levels and to sort all the factors in the index system of environmental risk assessment by digital language.The risk assessment model of shale gas mining environment pollution is constructed by fuzzy comprehensive evaluation method,and the environmental risk grade is divided,and the relative environmental risk is calculated by using the weight of environmental risk assessment index at all levels,thus the risk grade of shale gas mining environment is determined.According to the model construction of analytic hierarchy process and fuzzy comprehensive evaluation method,the maximum reliability event of shale gas is determined,and it is concluded that the groundwater pollution is the biggest risk reliability event of shale gas mining environment.Then,the application of MODFLOW is applied to the transport ofpollutants in well Ning X under the condition of groundwater pollution,and corresponding measures are put forward.The research method in this paper quantitatively explains the environmental risk grade of shale gas exploitation,and provides reference for environmental protection measures in the process of shale gas exploitation.Targeted environmental protection measures can effectively guarantee the probability of environmental pollution risk,so as to ensure the harmonious development of shale gas exploitation and environmental protection.