夹层对优势通道形成与演化的影响  

Influence of interlayer on the generation and evolution of high permeability channels

作　　者：房士然[1] 

机构地区：[1]中国石化股份胜利油田分公司地质科学研究院,山东东营257015

出　　处：《油气地质与采收率》2010年第1期90-92,95,共4页Petroleum Geology and Recovery Efficiency

摘　　要：针对河流相正韵律厚油层在长期注水过程中底部容易形成大孔道,将储层参数演变模型与流体渗流微分方程耦合在一起,建立了正韵律厚油层优势通道形成与演化的流固耦合数学模型,利用该模型模拟计算了夹层存在条件下厚油层优势通道形成与演化规律,研究了夹层对优势通道形成与演化的影响。结果表明:正韵律厚油层的底部及井底附近地带容易发育优势通道;靠近注入井附近地带的夹层上部地层更容易形成优势通道;正韵律厚油层中,夹层位置越靠下,其上部地层更加容易发育优势通道,而下部地层则相对不容易形成优势通道;夹层的展布面积越大,其下部地层越不容易形成优势通道;夹层渗透性越差,夹层下部地层越不容易发育优势通道。High permeability channels often create at the bottom of thick oil layers with positive rhythm of fluvial facies sandbodies in the process of long time waterflooding.A fluid-solid coupling mathematical model is established by coupling the evolution model of reservoir parameters with the fluid flow equation,which can describe the generation and evolution of the high permeability channels.Based on this model.the formation and evolution laws of the high permeability channels in the thick oil layers with interlayers were simulated and calculated,and the influence of interlayers on the formation and evolution of the high permeabil-ity channels was analyzed.The results demonstrate that:the high permeability channels exist mainly at the bottom of the thick oil layers with positive rhythm and at areas close to bottom hole,and develop more easily in the formation located over the in-terlayer near the bottom hole;in the thick oil layers with positive rhythm,the lower the interlayer locates.the more easily the high permeability channels develop in its upper formation,and difficult develop in Us lower formation.The larger spreading ar-ea and lower permeability of the interlayer all result less developed high permeability channels in its lower formation.

关 键 词：优势通道 流固耦合 夹层 正韵律厚油层 控制作用 

分 类 号：TE310[石油与天然气工程—油气田开发工程]