Study On Internal Architecture Of Channel Sandbody Of The S? Reservoirs In The West Of Sa-zhong Development Area

River delta sedimentary system in daqing oilfield for continental basin,complex sand body development in basin,difficult exploitation as the demand is gradually increasing with the development of oil field for many years,and compared with foreign many large fields of Marine reservoir production cost is much higher,currently under the background of low oil prices is not conducive to the development of the domestic oil industry.In the present economic situation,oil is put forward on the strategy of "authors efficiency" to maintain the development of old fields,in this strategy under the guidance of policy,underground reservoir need more detailed research,the reservoir configuration is the important factors that affect oil and gas recovery factor,so the he reservoir and its spatial configuration of seepage barrier,internal structure has become the focus of research.Fluvial facies sedimentary and delta sedimentary facies deposition,both the sedimentary facies in the river is famous for its development,thus become an important channel sand body of rich oil and gas group,has long been the channel sand body is the focal point of oilfield development,so under the background of the current economic situation,nature also becomes the channel sand body must be in-depth study of the object.In this paper,the author select the target layers which is in North-1area with alkali class?ASP,research the reservoir internal structure of the single sand body under the condition of the dense well pattern in the middle and later periods of the oilfield development.Comprehensive utilization of dynamic and static geological data,such as core and logging,guided by the outcrop and modern deposition,then Stratigraphic analyzed the 694 wells and identified microfacies features,logging microfacies model of the target area.according to the study of reservoir flow units,and the establish the geological model,we have presented the method of identified large-scale overlapping channel and the forecasting method of thin intercalation with 4 levels.Through comprehensive analysis the core and logging data,we conclude that reservoir is delta front subfacies deposits,the main development is subsea distributary channel,sand sheet,sheet sand microfacies,then logging facies of each microfacies is established,the detailed anatomy of sedimentary microfacies for each small layer,and the spatial distribution of sand body form.Through the core and outcrop and well logging curve characteristics,we determine interlayer identification method and distribution patterns,the size and distribution characteristics of accretionary body of target area by detailing anatomy of the underwater distributary channel sand body and the control of the the remaining oil by mezzanine density and perforation position was also confirmed.