关键词: 确定度, 煤层气组分, 气相色谱

Abstract: A measurement of coalbed methane components is directly connected to coalbed methane reserve and successful rate of development engineering. Uncertainty is the key index in marking the reliability degree of measurement results, which comes from three aspects in response values repeatability of coalbed methane components, response values repeatability of standard gas components and accuracy of standard gas. Influence extent is calculated based on testing data of each factor. Uncertainty of standard gas has a larger influence on uncertainty of samples, repeatable measurements of high concentration components leads to higher uncertainty. Uncertainty of coalbed methane components is related to component concentration so that uncertainty of measurement varies with components concentration.

Key words: uncertainty, coalbed methane components, gas chromatography