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以相对注水时间为横坐标,将注污水井和注清水井分类统计,分别计算平均视吸水指数和井口压力随注水时间的变化,以此分析地层的吸水能力变化动态。用不同注水时间段的洛伦茨曲线反映吸水剖面变化趋势,并用基尼系数定量表示地层吸水剖面的变化。杏河油田长6油藏随着注水时间的延长,污水回注后地层吸水能力下降,注水54个月后下降了61.9%,井口压力由5.0MPa上升到10.2MPa;而污水回注吸水剖面有变好的趋势,2001年吸水较好的40%厚度的吸水量占总吸水量的62%,而到2003年下降到51%,基尼系数也从0.416变到0.202。
Taking the relative water injection time as abscissa, we classified the injection well and the injection well into statistical categories, and calculated the change of average apparent water absorption index and wellhead pressure with water injection time respectively to analyze the dynamic change of water absorption capacity. The Lorenz curve of different waterflooding time periods reflects the changing trend of water absorption profile and quantifies the change of strata water absorption profile with Gini coefficient. With the extension of waterflooding time, the water absorption capacity of the strata after wastewater reclamation dropped by 61.9% after 54 months of injection and the pressure at the wellhead increased from 5.0MPa to 10.2MPa. However, In 2001, the better water absorption of 40% of the total water absorption accounted for 62% of the total water absorption, but dropped to 51% in 2003 and the Gini coefficient changed from 0.416 to 0.202.