The Southern of Shiwu Fault Depression in Songliao of fan delta and braided river delta of the features of sedimentary system

In the Shiwu Fault Depression lake basin of southern Songliao Basin,fan delta depositional system develops in the west side of the steep slopes,with high sediment thickness and fast phase-change,coarse andmiscellaneous lithology,braided river delta develops in the eastern side of the gentle slopes,sandbody distributes relatively large ranges,but the thickness of sedimentary is thin.After the rapid entry into the water it becomes open lake deposits.Fan(braided river) deltas is divided into braided fan(braided river) delta plain sub-facies,fan(braided river)delta plain front subfacies and the front fan(braided river) delta subfacies according to the lithofacies and well logging seismic facies of a three-pronged.And the identification method of micro-braided river facies,braided distributary channel microfacies,water sewer microfacies,frontal sand microfacies,edge sheeted-sand microfacies,open lake sedimentary microfacies and underwater gravity flow sedimentary microfacies is introduced.