低渗透储层分类标准及其综合评价——以敖包塔-葡萄花油田FⅡ油层组为例

敖包塔-葡萄花油田钻遇扶杨油层FⅡ油层组有效孔隙度主要分布在10%~15%之间,平均为12.6%;空气渗透率一般分布在0.1~10×10-3μm2之间,属低孔、特低渗透性储层。通过对选用7项宏观参数与7项微观参数确定储层综合评价参数并建立分类标准,确定出每个评价参数的分级标准,将敖包塔-葡萄花油田FⅡ油层组的储层分为四类,其中Ⅰ类最好,为低渗透储层;Ⅱ类次之,为特低渗透储层;Ⅲ类再次之,为超低渗透储层;Ⅳ类储层最差,为极差储层。依据专家经验及大量反复实验的结果上确定了权重系数,预测了FⅡ油层组的储层有利区带,结果表明敖包塔-葡萄花油田FⅡ油层组以Ⅰ类储层和Ⅱ类储层区为主,其中最有利储层区(Ⅰ类储层区)主要呈条带状分布于研究区北部的葡332~葡54~葡115-51、葡31、葡462、敖10等井区。

Low permeability reservoir classification standard and comprehensive evaluation——Take Aobaota-Putaohua oilfield FⅠ reservoir as an example

Aobaota-Putaohua oilfield drilling in Fuyang oil layer in FⅡreservoir effective porosity is mainly distributed in 10% -15%,the average was 12.6%;air permeability distribution between 0.1-10×10^-3μm^2,and belongs to the low porosity,low permeability reservoir.To determine the comprehensive evaluation of reservoir parameters and classification standard based on the selected 7macro parameter and 7parameters,to determine the grading standards of each evaluation parameter,the reservoir of aobaotaPutaohua oilfield FⅡreservoirs are divided into four types,one type is the best reservoir,low permeability reservoir class II;second,for the low permeability reservoir;Ⅲclass again,for the low permeability reservoir;type IV reservoir is the worst,as the range of reservoir.To determine the weight coefficient in the expert＇s experience and results of a large number of repeated experiments,prediction of favorable reservoir zone of F Ⅱ oil-bearing belt,results show that the Aobaota- FⅡreservoir Putaohua oilfield in class I and class II reservoirs in reservoir area,the most favorable reservoir zones where（I reservoir area）was the main research area of zonal distribution in northern,for example Pu332- Pu 54- Pu 15-51,the Pu 31,Pu 462,Ao 10well area.