The Sedimentary Microfacies Research Of The Sâ…¡15+16 Reservoirs In Sanan Development Region Of Daqing Placanticline

Sanan development region is lacated in the Saertu oilfield’s southern of Daqing Placanticline,which have been developed over 40 years. It has ertered the later stage of development,so the fine geologic research of reservoir is of vital importance to comprehensive adjustment and tapping potential of oilfield development. In this paper, depending on the structural and sedimentary characteristic of the research region, the data of core-drilling wells,logging,seism of the region, and the theory of sedimentology,logging, petroleum geology and the Daqing oilfield fine reservoir description, applying the research approach of from point(well)to line(section),from line to face(surface)and from face to field (time and space), the auther divide and contrast the sedimentary unit, and establishes high precision strata frame; then concludes the plane and vertical distributing regularity of sedimentary microfacies and sandbody of Sâ…¡15 and Sâ…¡16 reservoirs in research region. The results will offer the positive purpose for the adjustment of the reservoir layer boundaries and exploration and development of the remaining oil in the later stage of the oil field.Many researches such as dividing and correlation of the sedimentary unit, sedimentary mierofaeies and sandbody distributing regularity, reservoir evaluation have been done in Sanan development region in this paper:Dividing and correlation of the sedimentary unit:a principle was followed, that was selecting key wellsâ†'making up main frameworkâ†'other framework.The first step was to divide the sedimentary unit using key wells, the seeond was to make up main frameworks including these key wells, and the third was to make up other frameworks.As aresult,8 horizontal frameworks and 8 vertieal frameworks were made up.Sedimentary mierofaeies and sandbody distributing regularity study:according to observing and describing of cores of 4 wells in study region,lithology type and depositional structure is recognized. Through the contrast of electric proper and rocks,the establishment of core geological facies,logging facies analysis and facies model,the determination of the delta front intrafacies and shallow lacustrine intrafacies are emphasized. The delta front intrafacies includes underwater interdistributary channel microfacies, the first sorts sand sheet microfacies,the second sorts sand sheet microfacies, marginal sand sheet microfacies and inter-sand sheet shale microfacies. The shallow lacustrine intrafacies only includes shallow lacustrine shale microfacies. Sedimentary microfaeies plane distributing pictures were drew in every sedimentary unit,and concludes the plane and vertical distributing regularity of sedimentary microfacies of Sâ…¡15 and Sâ…¡16 reservoirs in research region.On the base of sedimentary microfacies research, furtherly analyzes and studies the sandbody growing feature and distributing regularity on the all kinds of Sedimentary environment,and acquires new recognition.