Characteristics Of Sedimentary Facies Of Clastic Reservoir Of Denglouku Formation Of Deep Zone In Songliao Basin

Songliao Basin Cretaceous of Asia is the largest ancient land, Cretaceous basin development, one of the most complete, is located in north-eastern part of China is a major rift within the cratonic basin complex is in Cenozoic sedimentary basins. The evolution of Songliao basin are devided into rifting, fault-depression, depression and atrophy. Denglouku formation formed in the mid-Early Cretaceous, in the Pass Basin off the conversion period, the special characteristics of the sedimentary basin.In this passage, the course of the study, using a variety of information on the Songliao Basin deep Denglouku of depositional systems and sedimentary facies study of the system. Through basic geological data and core data for the entire basin within the scope of different locations in different faulted sedimentary facies of the single well analysis. Through the summary of comparison, the proposed Songliao Denglouku basin sedimentary facies / sub-phase division table; come in Denglouku period, Songliao Basin alluvial system developed, the river system, the delta system, as well as four kinds of sedimentary lake system system; into the alluvial fan, braided river, meandering river, braided river delta, meandering river deltas, lakes, six kinds of sedimentary facies type. Alluvial fan in the basin are the northern and southern basin development. Dehui faulted in, the well logs show that most of the single well for the braided river depositional characteristics. In Xujiaweizi depression, the single well analysis of sedimentary facies are mostly meandering river sedimentation, flooding and more development of the basin. Deep basin where the water appears in the Gulong rift, rift CHANGLING central Xujiaweizi depression Xujiaweizi northern and southern, mainly in mudstone, and relatively large thickness, the instructions for the semi-deep lake - deep lake sediment setting. Depositional model in accordance with the lake, shallow lake environment around the semi-deep lake - deep lake environment outside of a strip of the Central Office, the sedimentary facies distribution. Basin, the depositional system in the river and lake sedimentary system of interchange, Delta depositional system development, anti-cyclic combination of lithology, funnel-shaped curve of the natural gamma logging, a typical response to a delta sedimentary characteristics.Drilling wells through the profile analysis together, and no wells typical seismic facies analysis, in Denglouku period, Songliao Basin sedimentary facies distribution in space and changes of the characteristics. Further confirmed in the northern and southern basins are the existence of source area, basin Xujiaweizi depression may also be along the west side of the local source area; relatively deeper water areas in Xujiaweizi depression and Gulong the southwest rift District. Denglouku lower deposition is still the effects of synsedimentary faults. Analysis of sedimentary facies distribution summary obtained by a variety of factors: tectonism, ancient landscapes, ancient climate and sediment supply. Basin-wide mapping in Denglouku sedimentary facies distribution period for the Songliao Basin provide a basis for exploration of deep, practical information.