DISTRIBUTION OF NITROGEN COMPOUNDS AND CHARACTERISTICS OF HYDROCARBON MIGRATION IN THE YANQI BASIN

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.