Study On Reservoir Sedimentary Microfacies Of Quantou Formation Of Fuyu Oilfield In Songliao Basin

Songliao Basin is a large oil and gas basins. Since the 1959 discovery of the Daqing oil field has attracted worldwide attention since Basin has been found more than 40 oil and gas fields, oil and gas production accounts for one third of China's total oil and gas.Songliao Basin can be divided into the north plunge area, northeast uplift area, the western slope zone, the central depression, the Southeast and Southwest uplift total of six secondary structure units. The central depression area Fuyu bright future exploration and development. Fuyu Quantou as an important reservoir, the need for further research. Based on an X zone Fuyu Quantou petrology, sedimentary texture and structure, well logs, a comprehensive analysis of particle size distribution, made the following key understanding:1) The Quantou three paragraphs are fluvial deposits, sedimentary facies in the river below, but also identify the meandering river facies, small crevasse channel facies, abandoned channel facies, there is some further identification of micro-dam with the natural levee facies, crevasse splay facies, thin overbank sand microfacies, river mud between the micro-phase deposition for the further development of oil fields to provide a reliable geological basis.2) The Quantou four paragraphs are delta facies, sedimentary facies in the delta under, but also to identify delta distributary plain, and shallow-water delta front, distributary channel and further to identify the micro-phase, waste distributary channel facies, small burst distributary channel facies, microfacies natural levee, crevasse splay facies, thin sand overbank facies, micro-phase segregation between, on the understanding of reservoir sand bodies is important.3) Plane from the sedimentary facies distribution map shows that micro-phase radial channel branching, convergence banded structure, more frequent in the minor cross; natural levee along their longitudinal axis parallel to the flow of the lens distribution, in the main layer contiguous between the river; shunt between the main reservoir on the microfacies were small pieces, banded structure, which was not even in the minor sheet large distribution.4) Through this comparative study of sedimentary facies that, in these types of sedimentary facies, the reservoir capacity of the best channel is the main future direction.