兰坪盆地古近系宝相寺组层序地层分析

ccording to the theory and approach of the sequence Stratigraphy,we have investigated the Paleogene Baoxiangsi Formation outcrops in Lanping Basin,and identified four sequence boundaries(oneⅠtype and threeⅡtype).Sequence stratigraphy framework model and sandbody architecture have been illustrated, furthermore ，evolutionary model of sequence strata have been established and lacustrine level change on sand body sedimentary structure have an important influence in Lanping Basin；the sand body may have eroded in early LST, and many in grain of sandstone primarily，amalgamed channel filled sand body was espected in late LST;Sand body more for fine-grained mudstone, show isolation shape form in TST；Sand body in table form sand body is given priority to, mainly by the littoral and shallow lake, half a deep lake and lake delta depositional system formed in HST.