Control of paleo topography on sedimentary facies in Dongwa of Huanghekou,Bohai sea

According to the latest 3 D seismic data,combined with drilling,core,wall core and other data,the paleo topography of the provenance area of Bonan low uplift and Laibei low uplift in the east of Huanghekou was analyzed,the control effect of provenance,slope break,gully and other paleo topography on the enrichment difference of sedimentary sand body was discussed,and the sedimentary facies type and distribution scale under the control of paleo topography was defined.The results show that Bonan low uplift is of a steep slope type provenance,and its parent rock is mainly Precambrian granite,which is easy to be weathered and eroded,with developed gullies,high enrichment of sand body,large scale of provenance and wide range of sand body.Laibei low uplift is of a gentle slope type provenance,which mainly develops Precambrian granite,Mesozoic andesite and Mesozoic tuff.The effective provenance area is small,the supply capacity is weak,the gullies are not developed,and the braided river delta is small.The type of parent rock is the key to find high-quality sand rich reservoirs.The sand rich sediments through the paleo-ravine carried by water flow are enriched in low depression area,and the braided river delta rich in sand is a favorable area for exploration.