江苏低渗断块油藏储层分级评价和井网设计

Comprehensive evaluation and design of well pattern for low permeability fault-block reservoir in Jiangsu oilfield

通过多参数综合评价方法,考虑了储层主流喉道半径、可动流体百分数、启动压力梯度、粘土矿物含量、原油粘度、形状因子及储量丰度等7个因素,对江苏油田7个低渗断块储层进行分级评价,采用非线性渗流数值模拟及油藏工程方法对各级储层井网形式进行研究。结果表明:A、B、H 3个区块属于Ⅱ类储层,D、E、G 3个区块属于Ⅲ类储层,F区块属于Ⅳ类储层;Ⅰ~Ⅲ类储层可以有效开发,Ⅳ类储层在现有技术下难以有效动用;M、N两种类型的适用于低渗断块油藏的三角形井网形式中,Ⅰ类储层采用M或N型井网形式皆可;Ⅱ类储层采用M型井网形式效果好于N型井网形式;Ⅲ类储层采用N型井网形式补充能量差,M型井网能更好地建立有效的驱替体系;Ⅳ类储层不宜开发。

Seven blocks in Jiangsu oilfield are divided into four categories through comprehensive evaluation,including main throat radius,movable fluid saturation,starting pressure gradient,the contents of clay,the viscosity of underground crude oil and the shape factor.And nonlinear porous flow simulation method and reservoir engineering method are used to study reservoir pattern forms at various levels The results show that class I-III reservoirs can be developed effectively,while class IV reservoir can not be developed under the existing technology.Class I reservoir can be applied by both M pattern form and N pattern form.Class II reservoirs in the form of M pattern is better than N pattern.Class IV reservoir is not suitable to develop.