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作为喇萨杏油田稳产潜力的重要组成部分———表外储层 ,在注水开发中动用程度一直是人们普遍关心的问题。在油水井测试及密闭取心检查井资料统计分析基础上 ,研究了注水开发过程中表外储层的动用机制 ,取得了非实体连通是导致表外储层难采的地质因素 ;层间干扰是导致表外储层难采的动力因素 ,表外储层动用状况取决于基质与压裂裂缝间能量交换的能力 ;压力下降导致裂缝渗透性下降影响了表外储层的渗流等认识。进而认为在目前井网开采条件下表外储层能否起到预期的稳产接替作用是个值得进一步深入研究的问题。
As an important part of the potential of stable production in LaSaXing Oilfield --- off-balance sheet reservoir, the degree of utilization in water injection development has always been a common concern. Based on the statistical analysis of well test data and closed coring check well data, the mechanism of the out-of-table reservoirs in water flooding development was studied and the non-physical connectivity was the geological factor leading to the difficulty of extra-surface reservoir. Interlayer interference Is the dynamic factor that leads to the hard-mining of off-surface reservoirs. The utilization of off-surface reservoirs depends on the ability of energy exchange between matrix and fractures; the decrease of fracture permeability caused by the pressure drop has an effect on the seepage of off-surface reservoirs. Furthermore, it is considered that whether the off-surface reservoirs can play the role of expected succession and succession replacement under current well pattern mining is a problem worthy of further study.