摘要
通过反解洛伦兹曲线,得到相同渗透率均值的不同非均质程度油藏的渗透率分布,据此建立了典型油藏地质模型。采用数值模拟方法,研究了非均质油藏开发规律,结果表明:渗透率变异系数小于等于0.2时,油藏可视为均质的,正、反韵律油藏注入水均沿高渗透层突进,渗透率剖面与含水率剖面具有一致性,且反韵律油藏含水率剖面比正韵律油藏变化更为平缓,正韵律油藏最终采收率与渗透率变异系数成修正的逻辑斯蒂函数关系;当渗透率变异系数小于0.4时,最终采收率随渗透率变异系数的增加缓慢下降;当渗透率变异系数大于0.4时,最终采收率随渗透率变异系数的增加下降较快,正韵律油藏含水率与可采储量采出程度成经验函数关系,反韵律油藏最终采收率高于正韵律油藏,含水率上升速度始终低于正韵律油藏,且中等非均质程度时差异较大。
The Lorenz curve has been used to evaluate the heterogeneity of reservoir.The permeability distributions of different heterogeneous reservoirs with a uniform permeability mean value are obtained by calculating the Lorenz curve inversely.A typical geological model is established herein.Numerical simulation has been performed to study the development rule of heterogeneous reservoir.It has been revealed that when the variation coefficient is smaller than 0.2,the reservoir can be regarded as homogeneity. Water is channeling in high permeable layers,and there exists consistency between permeability profile and water-cur profile. The water-cut profile of inverted rhythm reservoir is more uniform than positive rhythm reservoir.There exists a modified logistic function between ultimate recovery and variation coefficient for positive rhythm reservoir.The ultimate oil recovery decreases slightly as the permeability variation coefficient increases up to 0.4,and then decreases rapidly.There exists an algebraic equation between water cut and producing degree of recoverable reserves.The oil recovery of inverted rhythm reservoir is higher than positive rhythm reservoir,and the increasing velocity of water-cut for positive rhythm reservoir is always faster than anti-rhythm reservoir,and the difference is more obvious for medium heterogeneous reservoir.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2011年第5期63-66,115,共4页
Petroleum Geology and Recovery Efficiency
基金
国家科技重大专项"高温高盐油藏化学驱油藏模拟关键技术"(2008ZX05011)
关键词
非均质油藏
渗透率变异系数
开发规律
数值模拟
洛伦兹曲线
heterogeneous reservoir
permeability variation coefficient
development rule
numerical simulation
Lorenz curve
