Research on High-resolution Sequence Stratigraphy and Prediction to Lithologic Traps of the Qingshankou Formation in Yueliangpao Area of the Southern Songliao Basin

Yueliangpao area is located in the delta front of western slope in southern Songliao Basin.Under the influence of slope and provenance,stratigraphic correlation,sedimentary facies recognition and lithologic trap exploration are hard to perform.By establishing high-resolution isochronous stratigraphic framework and re-analyzing regional sedimentary evolution model,several sets of updip pinchout seismic reflection axis are identified in the interior of Qing 1st and Qing 2nd sequence,and Qing 3rd sequence.Further research proved that these seismic reflections are responses of multiple-stage overlay delta front deposition of Gaotaizi oil reservoir in Yueliangpao area,where stratigraphic overlap trap are well developed.Therefore,the 3-D seismic technology can be used to describe the distribution form and range of lithologic trap.The theory of high-resolution sequence stratigraphy plays an important guiding part in the exploration of the lithologic oil reservoir in Yueliangpao area.