Characteristic Of The Chang6Remaining Oil Distribution And Technology Of Potential Tapping For Yao59Well Area, In Yaodian Oil Field

Chang6reservoir group of Yanchang Formation in Yaodian oil field is the research object,and is carried out the remaining oil distribution study by the meathods that dynamicmonitoring technology, reservoir engineering dynamic analysis and numerical simulation.Chang6reservoir is divided into four small layers such as chang61, chang62, chang63andchang64through the petrology characteristics, sedimentary structure, electrical characteristics,and paleontology comprehensive analysis methods. And four layers of chang6reservoirgroup structure form trend are commom, the overall is a gentle west dumping monoclinalstructure, strata dip Angle is less than1°, form a single internal construction, oil and waterdistribution is mainly controlled by lithology, is a sandstone lithologic oil reservoir.chang61and chang63development the delta distributary channel. Sedimentary micro-facies anddistributary channel is wide, thickness of sand body, chang62is not good than chang62,chang64distributary channel is relatively narrow, and the sand body thickness is most thin,and the reservoir mainly develop in chang61and chang63.In terms of reservoir heterogeneity, the majority of small layer’s heterogeneity coefficientand variation coefficient is larger, and intraformational heterogeneity degree is stronger inchang6oil group, but the small vertical interlayer heterogeneity is weak. And chang61andchang63small layer’s coefficient of variation and coefficient is both small, and the layerbetween the rate of change is very small, oil displacement effect is relatively good when waterinjection development. In addition, the developing factors also have important influence to thedistribution of remaining oil. Encryption perfect pattern can increase the control of waterflooding, reduce the influence of plane heterogeneity, increase the water flood sweepefficiency, increase effective water flooding control area and improve reserves producingdegree; control the critical water Wells and invalid water injection cycle, improve the singlewell production can through the technical means such as profile control, water plugging, noteand fill holes; build effective displacement system can by reasonable pressure system and thereasonable injection-production ratio study. In general, geological and development factorstogether affect low-ultra-low permeability reservoir remaining oil distribution the in Yao59area.