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As shallow gas reservoir was widely distributed in oilfield of China, it was defined as all kinds of gas with buried depth less than 1500m.The methane component content was 45%∼97.28%; and methane carbon isotope value δ 13C1 varied from 38.0‰ to 67.90‰, namely, based on the characteristics of carbon isotope and gas components in this field, it was believed that the thermogenic natural gas and microbiogenic gas were existed, though the shallow natural gas can be gathered into reservoir and has the industrial exploitation value. For the shallow buried of the shallow natural gas and the formation lithology with low diagenesis and high pressure, some phenomenon was often occurred such as well kick, gas leakage at well head, gas streaming, mud gas invasion, or blowout in severe case while drilling. The gas blowout accident and personal safety occurs frequently. The identification and evaluation of shallow natural gas reservoir can by means of drilling, total hydrocarbon gas logging and log interpretation. It can provide the reliable evidence for identification and evaluation of natural gas and promote the exploration and development process of shallow natural gas

Distribution Characteristics of Shallow Natural Gas in China Oil Fields and Its Influence on Drilling