洛伦茨曲线在杏六区吸水剖面研究中的应用

摘要

大庆油田杏六区油藏经过43a的注水开发,现已进入高含水开发后期,油层吸水的不均匀程度较为严重。通过与常规吸水剖面对比,运用洛伦茨曲线详细分析了杏六区2口注水井之间吸水剖面的不均匀程度,认为是由储层非均质性及人为因素所引起,并对比了单井在措施调整前后吸水剖面的改善情况,以及整个区块油藏在不同时期吸水剖面的变化。同时,在分析洛伦茨曲线基尼系数基础上,引入表征吸水剖面不均匀程度的＂不均匀系数＂,定量测定各层的吸水状况和吸水剖面的不均匀程度,认为该油藏吸水剖面极不均匀,并提出适合杏六区油藏的调整措施,为该区后续的注水开发和相应的措施调整提供了依据。%After forty-three years of waterflood development of the reservoirs in Xing 6 district,it is now in high water cut stage of development,and the water absorption of reservoirs is seriously uneven.Compared with conventional injection profile,Lohrentz curve is used to study that the uneven extent of injection profile of two wells in Xing 6 district is caused by reservoir heterogeneity and human factors,and analyze the differences of injection profiles before and after adjustment and the differences of injection profile in different times.Based on the analysis of Gini Coefficient in Lohrentz curve,"nonuniformity coefficient" was introduced to measure water absorption of different layers and the uneven extent of injection profile.It is considered that the uneven extent of injection profile in Xing 6 reservoirs is becoming more and more serious.Meanwhile,some corresponding adjustment measures were offered.All these provide a foundation for the further development and relevant measure adjustment in this oilfield.