Discussion on the Application of Gas Bearing Index in CBM Target selection and Evaluation
The gas-bearing property of coal bed reflects the material basis of exploration and development of coal bed gas,and involves the evaluation indexes of gas-bearing capacity,gas saturation,critical storage ratio,etc.This paper focuses on the analysis of gas saturation and critical storage ratio,and discusses the superiority of gas saturation and its theoretical and empirical relationship with critical storage ratio.The study shows that gas saturation as an index of CBM selection and evaluation has some advantages,which is more obvious than the relationship between gas content and production.Gas Saturation and critical storage ratio show a nonlinear positive correlation,which can not be considered in isolation in the evaluation of the selected area.It is suggested that gas saturation greater than 60%or critical storage ratio greater than 0.25 should be taken as the evaluation criteria of the selected area,the gas saturation more than 70%or the critical storage ratio more than 0.5 as the high output area.
coal bed methanegas contentgas saturatiocritical storage ratio
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