Yanqi basin, with an area of 13000 squre kilometer, located in the Bayinguoleng Mongolia autonomy state in Xinjiang, is a Mesozoic-Cenozoic superposed basin superimposed in the Southern Tianshan Hercynian erogenic belts. Triassic-Jurassic sedimentary sequence was a reformed basin .which is a set of coal-bearing sequence overlay by Cenozoic red Molasse. From 1993 to 2001, Baolang and Benbutu oil field, with an oil-bearing area of 26.3 squre kilometer and proven reserves of 4172+104t, have been fou...