Research On Sedimentary Microfacies In Oil Group Of Ⅱ Of The Third Section Of Shuanghe Oilfield

According to geological data of the third section in Shuanghe oilfield , this thesis takes Logging study,sedimentlogy,petroleum geologyp,Petrological,structural geology etc theories as its instrument , and take the sedimentary facies analysis technology, depositional facies analysis technology, oil-gas layer comprehensive evaluation technology as its Support, The study of reservoir characteristic research has been carried out in four aspects ,including the structure fault characteristic research, the structural history research, the sedimentary facies characteristic research and the oil-gas pool synthesis, suitable methods of characteristic description for this area have been summarized. Used core, well logging and seismic data to determine this area is fan delta deposition system which the fault of controlling sediment in eastsouth has an effect on, and the source direction is eastsouth.The type, the geometrical scales and the distributions of microfacies sandbodies are the basis of studies on underground water movement . The microfacies and their distributions of fan-delta Front in Shuanghe oilfield are analyzed in detail by using sealed coring data , highly dense well patterns and so on . Eight microfacies sandbodies including distributary channel,mouth bar front sheet sand,overflow sand,triage between Bay and gravity flow Sand are developed in the fan-delta front。In reservoir aspect, the oil source is sufficient in the study region, The deposition is the fan delta deposit system in the mass, and mainly develops sub-facies deposition of the front fan delta. It develops thick sandstone, the gritstone and the tuff, buries shallowly, and the nature is better. The reservoir bearing oil type mainly is nose-fault oil pool and the lithological character-structural oil pool. From the viewpoint section, it can identify three sets of reservoirs from the inversion section plane, the result is that II oil layers is best, and the connectivity is good. sand body gradually attenuates along the south or eastsouth direction of source.Microfacies Types and their distribution are in control of producing liquid water from the oil wells and in control of water movement into the underground, Therefore using the research results of Sedimentary microfacies to pinpoint the remaining oil-rich region and enhanced oil recovery could play better results.