DISTRIBUTION OF NITROGEN COMPOUNDS AND CHARACTERISTICS OF HYDROCARBON MIGRATION IN THE YANQI BASIN
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摘要: 利用含氮化合物作为油气运移示踪剂,探讨了含氮化合物在焉耆盆地油气充注方向研究中的应用。盆地侏罗系油藏原油中含氮化合物存在一定的运移分馏作用,表现为自生烃中心向外,含氮化合物绝对含量由高到低,屏蔽型化合物相对富集而暴露型化合物相对减少,异构体参数[a]/[c]的相对含量则由大变小。在同一构造带中,随埋深的减小,含氮化合物同样存在着运移分馏效应。研究表明,宝浪油田油气注入方向在平面上自南向北,在纵向上自深层向浅层运移聚集。Abstract: Nitrogen compounds can be used as indexes indicating oil and gas migration. This paper discussed the application of nitrogen compound content to the migration of oil and gas in the Yanqi Basin. The results of analyses on some parameters of pyrrolic nitrogen compounds in the Yanqi Basin showed that there existed the migration fractionation of pyrrolic nitrogen compounds in the Jurassic crude oil. From hydrocarbon generating centers outward, the concentration of nitrogen compounds changed from high to low. The migration fractionation effects of pyrrolic nitrogen also existed in the same structural zone. It was showed that the hydrocarbon of Baolang oilfield migrated from south to north on plane and from deep to shallow longitudinally.
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Key words:
- nitrogen compound /
- hydrocarbon migration /
- oil and gas accumulation /
- the Yanqi Basin
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