【摘要】 对青藏地区岗巴通-亚安乡、东巧-纳木错两条地表剖面301个样品进行了地球化学勘探试验分析,采用R型聚类分析、相关性分析、因子分析,对22项化探指标进行了优选。优选出主要评价指标为甲烷、重烃、蚀变碳酸盐含量、热释汞、荧光光谱F405、紫外光谱U222。在此基础上,分析了岗巴通-亚安乡、东巧-纳木错剖面主要优选指标的含量特征,定量评价了其综合异常。岗巴通-亚安乡剖面评价出Ⅰ级综合异常1个,Ⅱ级综合异常2个,Ⅲ级综合异常3个;东巧-纳木错剖面评价出Ⅰ级综合异常2个,Ⅱ级综合异常3个,Ⅲ级综合异常2个。化探结果较真实地反映地下油气信息,为该区油气勘探和预测提供依据。更多还原

【Abstract】 Geochemical exploration analyses of the 301 samples selected from the Gangbatong-Ya’anxiang and Dongqiao-Namco surface profiles in the Qinghai-Tibet Region were carried out.Twenty two geochemical exploration indexes were optimized by using the R-type clustering analysis,correlation analysis,initial factor analysis and orthogonal factor analysis.The main preference evaluation indexes were methane,heavy hydrocarbons,altered carbonate,thermal released mercury,fluorescence spectrum F405,ultraviolet spectrum U222.On the basis of the study,the content characteristics of main preference indexes in Gangbatong-Ya’anxiang and Dongqiao-Namco surface profiles were analyzed and their comprehensive anomalies were quantitatively evaluated.There are one I-level integrated anomaly,two II-level integrated anomalies,and three III-level integrated anomalies in the Gangbatong-Ya’anxiang surface profile.There are two I-level integrated anomalies,three II-level integrated anomalies,and two III-level integrated anomalies in the Dongqiao-Namco surface profile.Geochemical exploration results can actually reflect hydrocarbon information in the underground.It provides reference for oil and gas exploration and predication in the region.更多还原