| This paper's main study interval is Pâ… oil layer, as a matter of fact ,this interval is composed by the first section of Yaojia and some top part of Qingshankou group . Though single well analysis and wells profile correlation, the Pâ… 1 and Pâ… 2 of Pâ… oil layer belong to bottom part of Yaojia group, the third order's lowstand systems tract of bottom part of the Yaojia group is composed by them . Pâ… 3 to Pâ… 7 belong to the top strata of Qingshankou, they composed the third order's highstand systems tract of the top part of Qingshankou .This paper use the principle of high-resolution sequence stratigraphy, the framework of high-resolution sequence stratigraphy can provide an effective strata comparison framework for the analysis of depositional systems, facies and prediction of sand distribution. The third order is the same as the principle of Exxon's sequence stratigraphy, the forth order is the depositional cycle between the two base levels that apparently rise, we use the transgressive boundaries that are easy to trace. The fifth order is the depositional cycle or parasequence set that represents single transgression or retrogression. According to these principles, we subdivided the Pâ… oil layer into three forth order sequences: Pâ… 1 to Pâ… 3 called the forth order sequenceâ… ; Pâ… 4 to the top part of Pâ… 5+6 is theâ…¡; and the bottom part of Pâ… 6 to Pâ… 7 is theâ…¢.After the framework of sequence stratigraphy is made up, within them, do some research about the fluvial sand superimposition, sub-facies, microfacies, internal architecture of the reservoir, and reservoir heterogeneities, then do some tentative research about the relationship between microfacies along with reservoir heterogeneities and distribution of remaining oil. Several microfacies types such as :delta front mouth bar, sub-distributed fluvial, marginal bar and distributed fluvial have been illustrated.
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