Abstract: For the less exploration of deep water turbidite reservoir in eastern sag of Liaohe Basin,the sedimentary type of the sand stones is analyzed by using two types of grain size discriminant function and genesis illustration in the article.Grain size analysis data is applied to distinguished the sedimentary environment of holoclastic rock by the discriminant function.The genesis illustration can reflect the change law of energy and flowability of clastic deposits during the sedimentary process.So,the the sedimentary environment of holoclastic rocks can be judged accurately by using the two ways.In this article,the glutenite of Oulituozi oilfield in Shasan middle section is judged as the turbidite deposition by using these methods,and then the depositional model of the sand stone is also discussed.

Key words: rain size analysis, discriminant function, genesis identification, turbidite, depositional model