Research On Sedimentary In Nantun Group In Wuerxun Depression Of Hailaer Basin

In this paper,combining test analysis data , we identified and divided every sequence unit by using theory of sedimentology and sequence stratigraphy , and established high precision sequence formation frame; then concluded plane distribution regular on the basis of the research of sedimentary facies of Nantun groupBased on the facies analysis of individual well and unite well profiles,we study on the plane distribution features of precipitation facies,and make the conclusion that the lithology of rocks in this region develop completely,mainly of which are coarse clastic sedimentary rocks and the grain grade under upder thicker.After multi-disciplinary anylysis, Nantun 4 sequence is divided into the Southern section of the four, as well as the three South Sec 4 a total of seven sequencesWe have identified three sedimentary facies- fan delta face, lake face and subsea apron face- in this area, and further divided nine subfacies and seventeen microfacies; we made analysis of panel display feature of every segment by researching seismic face and predicting sand body. Region of interest mainly developed fan delta-lake depositional system which direction of material supply is west-north and south-east, central developed fan delta- meare depositional system, and depressed area developed half abyss- subsea apron depositional system. Set up the study area of 4 rift lake sequence stratigraphy and sedimentary filling evolution models for the study area and similar basins in research and prediction of favorable area and provide a theoretical basis.