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Vertical fluid energy characteristics and orderly development suggestion in the southwestern region of Enhong Syncline in Yunnan

Wu Cong-cong,Yang Zhao-biao,Sun Han-sen,Zhang Zheng-guang,Li Geng,Peng Hui   

  1. 1.School of Resource and Geosciences,China University of Mining and Technology,Xuzhou 221116,China;
    2.Key Laboratory of CBM Resources and Dynamic Accumulation Process,Ministry of Education of China,China University of Mining and Technology,Xuzhou 221008,China;
    3.China United Coalbed Methane Corporation,Ltd.,Beijing100016,China
  • Received:2018-01-30 Revised:2018-04-20 Online:2018-08-10 Published:2018-08-10

Abstract: Reservoir fluid energy is the main driving force for coalbed methane development,and it is the key factor to obtain high production.It is of great significance to identify the fluid energy characteristics of coal measures to optimize the favorable sections of coalbed methane.In this paper,take the southwestern of Enhong block as the research object,based on pumping test data and coalfield exploration data,the layer characteristics of vertical fluid energy in the study area were analyzed from three aspects of apparent reservoir pressure,hydrodynamic field and water chemical field.It is found that there are obvious differences in different layers.The coal-bearing strata generally belong to under-pressure state.The average pressure coefficient of middle section is 0.86,and the fluid energy is the highest.The hydrodynamic condition of upper section is obviously stronger than the middle and lower sections,and has strong hydraulic connection with the surrounding aquifers,which was conducive to the drainage and depressurization.The groundwater closeness index of the upper section is 11.96 on average,the type of water quality is mainly HCO-3-Ca2+ type,indicating weak closeness and relatively open water chemical environment.The gas content of each section is high and the difference was small,which does not constitute the restriction condition of constraint development.The 5 hydrogeological evaluation indexes,including apparent reservoir pressure coefficient,unit water inflow,permeability coefficient,influence radius and groundwater closeness index,are extracted,and the development potential of different coal bearing sections is preliminarily evaluated by using grey relational analysis method.It is considered that the upper section is the favorable development layer,and is recommended as the preferred layer.The progressive development order of each coal bearing section is:Upper section → middle section → lower section.

Key words: The southwestern region of Enhong block, Coalbed methane, Fluid energy characteristics, Grey relational analysis, Orderly development

CLC Number: 

  • P618.13


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