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Discussion along Source Onlap Sequence Stratigraphy Model from Putaohua Oil Layer of Songfang Oilfield in the Northern Songliao Basin

The stratigraphy developmental model for Putaohua oil layer of Songfang oilfield in the northern Songliao basin are studied by using the data of core, well log, mud log and regional geology. The possible developmental models for target oil layer are each layer onlap thinning, each layer gradually thinning, truncated thinning and early foreset later structural uplift. And Putaohua oil layer is proved to be the each layer onlap thinning model with along source onlap features.