Comprehensive Evaluation Of The Wetland Oilfield Ecosystem

Wetland oil fields are the the main producing areas of China’s oil and gas resources, which arewidely distributed in Daqing, Liaohe, Jilin, Shenli, Jiangsu and Jianghan oilfields, etc.Development and production of oil and gas are easy to cause pollution and destruction ofwetland ecosystem, which take a challenge for ecosystem security of the wetland oilfield inChina. The study has important theoretical value and practical significance. PSR model, fuzzycomprehensive evaluation method and system dynamics theory are used to evaluate thewetland oilfield ecosystem. Optimized means are given accordingly. Specific researches andconclusions are as follows: The concept of the ecological carrying capacity of the wetlandoilfield is proposed. The qualitative and quantitative evaluation of theories and methods ofecological carrying capacity are studied. According to the ecosystem characteristics ofwetland oilfield, the PSR model of wetland oilfield ecosystem is proposed. Analytic hierarchyprocess and entropy technical amendments are used to analysis and diagnosis the ecosystemsof Shengli Oilfield. The proposed model can overcome the difficulties of fuzzy nature,half-baked nature, and randomness in the evaluation of wetland oilfield ecosystem healthassessment. The results provide a reference and a basis. Based on above results, fuzzyevaluation method is introduced to the oilfield ecological carrying capacity assessment.Evaluation model is built up to obtain the relationship between pollutant emission andecological carrying capacity of Shengli Oilfield. The different factors carrying capacityimpact on the oil field ecology of the wetland class membership function are given. Morepver,uncertainty, and fuzzythe impact factors are quantified. In order to improve the ecologicalcarrying capacity of Shengli Oilfield, the system dynamics model of gas resources-economic-ecological environment of wetland oilfield is built up. The system dynamics analysises ofthe subsystem of the system dynamics model, namely, oil and gas resources, economic, andecological environment, are carried out. The exploitation parameters are optimized. Thismethod overcomes the shortages of the traditional socio-economic methods that therelationship between oil resources and various environment system factors can not beaccurately descripted. Management policies are proposed accordingly to ensure the health ofwetland oilfield ecosystem, which defends the virtuous development cycle of oilfieldecosystem. This study will help to conduct an overall evaluation of wetland oilfieldecosystems. Moreover, the proposed PSR model, fuzzy comprehensive evaluation methodand system dynamics theory have enriched the evaluation theories and methods of wetlandoilfield ecosystem.