青海省雁石坪地区中上侏罗统雁石坪群地层烃源岩地化特征  

Geochemical characteristics of hydrocarbon source rocks in the Middle-Late Jurassic Yanshiping Group in Yanshiping area,Qinghai Province

作　　者：吴玉诗 WU Yu-shi(The Fourth Geological Survey of Jilin Province,Tonghua 134001,Jilin,China)

机构地区：[1]吉林省第四地质调查所

出　　处：《吉林地质》2019年第4期1-8,共8页Jilin Geology

基　　金：沱沱河艰险地区中止区调项目工作总结(I46E015008、I46E015009、I46E015010、I46E016008、I46E016009、I46E016010)

摘　　要：青海省雁石坪地区位于青藏高原腹地的羌塘盆地东部,研究区中生代沉积地层分布广泛,三叠系、侏罗系烃源岩研究程度低。在系统的烃源岩样品采集、地球化学分析的基础上,对各地层的生烃潜力进行了研究。结果表明雀莫错组、布曲组可以组成良好的自生自储式的生储盖组合;夏里组下部含丰富双壳类等化石的泥岩和粉砂质泥岩具有一定的生油能力。综合分析认为研究区内中上侏罗统雁石坪群中的黑色、灰黑色泥岩、页岩为较好的烃源岩,能够为该地区天然气水合物成藏提供有利的成烃条件。Yanshiping area of Qinghai Province is located in the eastern part of Qiangtang Basin in the hinterland of Qinghai-Tibet Plateau.Mesozoic sedimentary strata are widely distributed in the study area,while Triassic and Jurassic source rocks are poorly studied.Based on systematic sample collection and geochemical analysis of source rocks,hydrocarbon generation potential of each stratum is studied.The results show that the Quemocuo Formation and Buqu Formation can form good self-generating,self-storing source-reservoir-cap assemblages,and the mudstone and silty mudstone with abundant bivalves in the lower part of Xiali Formation have certain oil-generating capacity.Comprehensive analysis shows that black,grey-black mudstones and shales in Yanshiping Group of Middle and Late Jurassic in the study area are better source rocks and can provide favorable hydrocarbon-generating conditions for gas hydrate reservoir formation in this area.

关 键 词：烃源岩 雁石坪 侏罗系 地化特征 

分 类 号：P618.13[天文地球—矿床学] P534.51[天文地球—地质学]