The Characteristics Of High-resolution Sequence Sedimentary And Influence On Remaining Oil Of Gaotaizi Oil Layer In West Of Sa North

Because Daqing Oilfield has entered the late-stage development of high water, andGaotaizi oil layer has the potential to further tap the potential of the space. Therefore there isan urgent need to find out the influence and control of sedimentary sequence to the remainingoil and reservoir. To provide theoretical support for the distribution of remaining oil.In this paper, under the guidance of high resolution sequence stratigraphy,sedimentology and reservoir theory, take the research on the west of north second area inDaqing Oilfield of Songliao Basin. Divide the Gaotaizi oil layer and contrast reservoir layersequence. Then establish one long-term base-level cycle, two medium-term base-level cycle,35short-term base-level cycles of about10,000wells layers of multi-level sub-sequencestratigraphic framework. Study on core of the sealed coring wells for meticulous observationand study, and identify the area developed Delta front subfacies In coring wells. Furtherdivided into Subaqueous distributary channel microfacies, Flowing sand microfacies,Sheet-like sand microfacies, the mouth bar microfacies and subsea interdistributarymicrofacies.Analysis on the core and logging features of the various types of microfacies.Established the logging facies model of one sedimentary facies, two sedimentary subfacies,5sedimentary micro facies and13energy units. Meanwhile depicts plane distributioncharacteristics of the deposition of several key research areas of micro facies unit. Analysison the relationship between the various micro facies configuration plane. And reveals theGaotaizi oil layer two, three and four base-level cycles and sedimentary evolution inevolution coring wells and reservoirs in the study area. Focus on the causes and regularitiesof distribution of three single sand body, and analysis on the sandstone thickness, effectivethickness, permeability coefficient onrush, range and other parameters of the distribution. Thestudy area totally identified sand-control configuration remaining oil, residual oil river edgetype, the difference remaining oil reservoir type, narrow river-type four types of four kindremaining oil, determine the characteristics and distribution of different types of remainingoil. And detailed analysis on Remaining oil producing situation of subaqueous distributarychannel sand bodies, flowing sand bodies, sheet-like sand bodies three categories.