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大孔道是疏松砂岩油藏长期注水冲刷形成的次生高渗条带,极易造成注水低效循环。大孔道的形成严重影响了油田可采油的动用程度,而且增加了开发成本。因此必须加强对大孔道的识别及其形成机理的研究。以胡12块油田为例,通过对大孔道在吸水剖面、电性、静态等方面的特征分析,进而分析了大孔道的形成机制。胡12块油田大孔道的形成受储层的岩石学特征和成岩程演化度控制。成分成熟度高,填隙物含量少,碳酸盐胶结物少,成岩演化程度低,压实作用中等-弱的储层在后期长时间大规模注水加剧了大孔道的形成发育,是形成大孔道的直接原因。
Large channels are loose sandstone reservoirs formed by long-term water infiltration secondary hypertonic strip, easily lead to ineffective water cycle. The formation of a large channel seriously affected the utilization of oil recovery, but also increased the cost of development. Therefore, it is necessary to strengthen the identification of macropores and their formation mechanism. Taking Hu12 oilfield as an example, the characteristics of macropores in water absorption profile, electrical property and static state were analyzed, and then the formation mechanism of macropores was analyzed. The formation of macropores in Hu 12 oilfield is controlled by the petrological characteristics of reservoir and the evolution degree of diagenesis. The composition maturity is high, the content of interstitial is less, carbonate cementation is less, the degree of diagenetic evolution is low, compaction is medium-weak reservoirs, large-scale water injection in a later period exacerbates the formation of macroporosity, The direct cause of the tunnel.