| The target layer Chang 6 reservoir of Zi Bei oilfield in Maojiahe well area is affected by the depositional environment, diagenesis, structure and other factors, it has low porosity, low permeability, low pressure and strong heterogeneity characteristics. According to the research of stratigraphic, structure characteristics and deposition microfacies in the district, determining the layer Chang 6 is developed delta plain deposit system, the main deposition microfacies are distributary channel and outer edge, interdistributary low-lying land.The sand body distribution of the block is scattered,the strip sand or side sand body can’t be controlled in the 300 m well condition,control degree of water flooding slow.The plane,layer,interlayer contradictions is prominent.After years of development by water injection,the oilfield entered into high water-cut stage,the remaining oil distribution is scattered and enrichment area is diffcult to implement,which lead to the understanding and tapping of the remaining oil is difficulty.This article based on the block development characteristics,carried out the water flooding development effect assessment from water drive process, water flooding control degree, water cut rising rate,injection utilization, ect. This study build geological modeling and numerical value simulation of the block by the Petrel software and Eclipse software,combined with the influence to the distribution of the remaining oil such as sedimentary microfacies,structure,injection-production system etc.The main genetic types of the block of remaining oil is fault block type,not perfect injection production type,well nets could not control type,level,between the layers of interference.According to the distribution of remaing oil,the corresponding comer measures of tapping the remaining oil is infilfing and injection-production system adjustment, sidetrack horizontal well, fill holes, the profile control of injection wells, fracturing, acidizing. |
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