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为解决深层—超深层和非常规领域天然气勘探中面临的高演化、多元天然气成因和来源判识等关键性技术难题,通过实验新技术以及地质资料综合分析,完善了多元天然气成因判识方法体系。建立了腐泥型有机质不同演化阶段干酪根降解气和原油裂解气、聚集和分散型液态烃裂解气,N_2、CO_2有机和无机成因,惰性气体壳源和幔源成因,He、N_2、CO_2、天然气汞含量判识煤成气和油型气等多元天然气成因判识新指标及图版。通过在主要含气盆地的应用,明确了四川、塔里木和松辽盆地复杂气藏天然气成因和来源,有效支持四川盆地震旦系—寒武系古老碳酸盐岩、塔里木盆地库车坳陷深层、松辽盆地深层火山岩等领域的天然气勘探。
In order to solve the key technical problems such as high evolution, multi-gas origin and source identification in deep-ultra-deep and unconventional natural gas exploration, we improved the multi-natural gas genesis identification method system through experimental new technologies and comprehensive analysis of geological data . In the different evolution stages of sapropelic organic matter, kerogen and crude oil pyrolysis gas, aggregated and dispersed liquid hydrocarbon pyrolysis gas, organic and inorganic origin of N 2 and CO 2, shell and mantle origin of inert gas, formation of He, N 2, CO 2, Natural gas mercury content identification of coal gas and oil gas and other natural gas multiple genesis of new indicators and charts. Through the application of the main gas-bearing basins, the natural gas origin and origin of the complex gas reservoirs in Sichuan, Tarim and Songliao basins have been clarified, which effectively support the Sinian-Cambrian ancient carbonate in the Sichuan Basin and the deep in the Kuqa depression of the Tarim Basin , The Songliao Basin deep volcanic rocks and other fields of natural gas exploration.