Assessments Of Ecological Environment In The Central Part Of Huabei Oilfield Based On RS And GIS

Oil is an important mineral resource in China and plays an important role in the energy structure.In recent years,with the continuous development of oil resources,many oil fields in China have entered the stage of high exploration and development,and the environmental problems caused by oil and gas exploitation have become more and more prominent.With the rapid development of 3S technology,the use of remote sensing and geographic information system technology to monitor the environmental information of mining areas has become a conventional means.Different from the ecological environment evaluation of solid mines,a mature evaluation system has been formed.Because the ground feature information and mining mode of oil and gas mines are more refined and complex than those of solid mines,there are few studies on the comprehensive evaluation of ecological environment in oil production areas at present.Supported by the sub project of"remote sensing geological survey and monitoring of national mine environment restoration and control"and the project of"field verification of oil and gas development status of North China Oilfield in Jidong Oilfield",this paper takes the central oil and gas exploitation intensive area of Jizhong mining area of North China Oilfield as the research area,combined with multi-source remote sensing data and measured data,and starts from the analysis of oil field exploitation status and potential environmental problems,A set of ecological environment evaluation index system suitable for oil and gas mines is established,and the minimum information entropy combination weight combined with AHP entropy weight method is used to realize the ecological environment evaluation of oil fields.The main results are as follows:(1)Based on the domestic GF-2 satellite remote sensing image data,the ground feature information of oil and gas mines was extracted,and the current situation of oil field exploitation in the study area was found out.As of October 2019,3469production wells of various types were distributed in the study area,including 3275production wells,178 injection wells(water injection wells and gas injection wells)and 16 drilling wells,which were mainly distributed in Xiong county and Suning County,with less distribution of production wells in Anxin county and Li County,and no production wells in Dacheng county and Qingyuan district;Various oilfield buildings(stope,metering station,transfer station,combined station,etc.)cover an area of 771.17ha,of which Renqiu oilfield has the largest construction area;The interpretation width is more than 4m,and the total length of oilfield roads is215.29km.(2)This paper analyzes the potential impact of oil mining on the ecological environment from the aspects of soil environment,water environment and surface environment.Relying on the ecological environment evaluation index system of solid mines and comprehensively considering the quantifiable and scientific nature of the indexes,four first-class indexes of natural geography,mining status,resource damage and potential disaster hazards,and 12 second-class evaluation indexes such as vegetation coverage,deformation rate and productivity facility density are constructed with the help of Sentinel-1,Sentinel-2,GF-2 and other multi-source remote sensing data are extracted and analyzed by using remote sensing interpretation,numerical inversion,spatial analysis and other technologies.(3)Combining the subjective weight of analytic hierarchy process with the objective weight of entropy weight method,the minimum information entropy combination weight is obtained,which improves the scientificity and reliability of the weight value.Combined with grid analysis method and Arc GIS grid analysis,the ecological environment evaluation of the study area is realized.The evaluation results are divided into four categories:seriously affected area,relatively seriously affected area,slightly affected area and no affected area.The seriously affected areas are mainly distributed in Xiong County,Suning County and Raoyang County,The total area is about 33.89km~2,accounting for 0.34%,the more seriously affected area is204.95km~2,accounting for 2.09%,the slightly affected area is 314.43km~2,and the non affected area is 9235.73km~2.Corresponding treatment measures are put forward for the prominent environmental problems in the study area.