Study Of Reservoir Architecture PI Reservoir Group Of South3area Saertu Oil Fields

Reservoir sand body of South three east oil-bearing formation in daqing sal Fig. oilfield belongs to depositional systems in northern Songliao Basin,which is a large rivers-delta sedimentary system formed under the background of tectonic uplift and general lake retreat.Due to reservoir heterogeneity is serious, there is a need for research on intraformational heterogeneity parameters, which need to be careful dissection and description,to guide profile control after polymer flooding and optimization design of field test scheme. Understanding of a reservoir bed heterogeneity after polymer flooding reservoir heterogeneity and to guide further improve oil recovery after polymer flooding technique optimization and the preparation of field test plan, has important guiding significance. In this paper, aiming at the existence of the study area in the main geology, reservoir and development issues,based on geological data, coring data, logging data logging data,and production performance data,Subdivided into single sand layer, to carry out the research of sedimentary microfacies,Complete profile and plane distribution of single sand body, divided into single sand body contact mode,Evaluation of single sand body distribution and connecting relation, the single sand body interlayer characteristics,main controlling factor Analysis of single sand body distribution and physical property,executing single sand body3D modeling after dynamic data validation.Summarized the influence factors of chemical flooding after polymer flooding effect, provide the residual oil distribution area.Daqing changyuan consists of lamadian, sal Fig., almond, taiping chariot, high platform, putaohua, aobao tower seven anticline structure composed of a tertiary tectonic units in the north of songliao basin.The study area is located in the central depression area of daqing changyuan sal Fig. of the oil field south areas in the northeast, south well drainage in2d6and3-3row.Due to the reservoir development has arrived in middle-late, watered-out degree is high, reservoir heterogeneity characteristics differences, and because the pattern is not perfect, leading to the distribution of remaining oil concentration, making development is difficult,so we taking reservoir architecture research.So we need to study of reservoir heterogeneity, carry enough theoretical basis for further development of remaining oil.Technology means is:(1) through the theory of modern sedimentology, and logging facies, carrying sequence stratigraphy and flow unit study;(2)interwell heterogeneity parameters of stochastic simulation and reservoir structure analysis technology;(3) the change of reservoir property parameters and characterization techniques;(4) the technology of identification sedimentary microfacies;(5)Composite river inside a single river dividing technology;(6) the technology of Point Dam identify and tendency;(7) Laminated side angle, lateral accretion layer between computing and well spacing distribution side lamination technology.After comprehensive study of the south three east reservoir characteristics, we get conclusions:(1)Through stratigraphic correlation, and discovered the daqing oil field is in multi-stage base level cycle.For more than3cycle, its formation is almost a thickness distribution, level4cycle in the sedimentary period is affected by the degree of channel incised.Closed by comparing strata in the study area, stratigraphic framework was established, and lay a foundation for the research of reservoir behind the configuration.(2) through the layers of storage structure analysis method, the different causes of the south three east thick sandstone reservoir sand body space structure analysis. Analysis results show that some of the sand body is independent of the six levels of configuration elements, another part of thick reservoir sand body is more than six levels of structure, on the transverse thickness is larger, distribution range is wide, slightly on the longitudinal cut pile, the horizontal continuous.(3) through the application of various data, analyze the delta distributary plain distributary channel of single well, section structure features, plane, the plane is divided into banded sand body distribution, sand body length width ratio is less than3:1;(5) based on the single genetic sand body identification, analysis and evaluation of reservoir layer, interlayer and plane heterogeneity characteristics.Comprehensive analysis shows that the Portuguese north layer of sand reservoir heterogeneity degree of medium-weaker, but it has medium-strong plane heterogeneity degree;(6) on the basis of modern sedimentary, and in daqing oilfield, well pattern under the guidance of encrypted data, come to the conclusion that the size of the single channel and point identification and the size of the dam.The single channel of the widest reached$850m, the narrow also has200m. Single channel has one or more points on the dam, the side point of dam body of spacing between20to40m, integrated the horizontal width of the single side in the70-110m.(7)Through the study we concluded that intraformational heterogeneity have influence on residual oil distribution, remaining oil in positive rhythm reservoir is high, while is low in the reverse rhythm reservoir; unconnected space areas of sand bodies is residual oil enrichment.