0 引言
1 区域地质背景
2 储层基本特征
2.1 矿物组分
图3 Y113—Y133井区盒8段致密砂岩储层显微照片(a)可见石英、长石、云母、石英岩岩屑,YQ1井,2 867.35~2 867.40 m;(b)黏土岩屑和千枚岩岩屑,可见方解石,YQ1井,2 870.20~2 870.25 m;(c)偶见有绿帘石,YQ1井,2 878.60~2 878.67 m;(d)粒间分布片状黏土矿物,Y101井,2 997.18~2 997.27 m;(e)书页状蚀变高岭石,Y101井,3 002.68~3 002.74 m;(f)残余粒间孔,Y153井,2 761.02 m;(g)长石粒内溶蚀孔,Y153井,2 760.8 m;(h)长石粒间孔,Y101井,2 998.73~2 998.87 m;(i)微裂缝,Y153井,2 764.18 m Fig.3 Micrograph of tight sandstone reservoir in He 8 Member of Y113-Y133 wells block |
图4 盒8段砂岩主要碎屑成分含量直方图Fig.4 Histogram of main detrital component content of He 8 Member sandstone |
2.2 填隙物组分
图7 Y113—Y133井区盒8段致密砂岩填隙物组分柱状图Fig.7 Histogram of tight sandstone interstitial components in He 8 Member of Y113 -Y133 wells block |
2.3 孔隙类型
2.4 物性特征
3 致密气储层物性下限确定
3.1 储层物性下限确定
3.1.1 经验统计法
3.1.2 压汞法
3.1.3 试气法
3.2 储层物性下限检验
3.2.1 物性模型检验
3.2.2 最大孔喉半径与物性拟合检验
3.2.3 生产动态检验
4 储层分类
图15 储层含气饱和度与无阻流量关系Fig.15 Relationship between reservoir gas saturation and open flow |
图16 储层无阻流量与有效厚度关系Fig.16 Relationship between open flow and effective thickness of reservoir |
图17 储层含气饱和度与电阻率关系Fig.17 Relationship between gas saturation and resistivity of reservoir |
图18 储层孔隙度与声波时差关系Fig.18 Relationship between reservoir porosity and acoustic time difference |
图19 储层声波时差与密度关系Fig.19 Relationship between acoustic time difference and density in reservoir |
表1 研究区盒8致密储层分类评价标准Table 1 Classification and evaluation criteria of He 8 Member tight reservoir in the study area |
分类 | 物性特征 | 含气性特征 | 有效厚度 /m | 无阻流量 /(104 m3/d) | 电性特征 | |||
---|---|---|---|---|---|---|---|---|
孔隙度/% | 渗透率/(10-3 μm2) | 含气饱和度/% | 声波时差/(μs/m) | 密度/(g/cm3) | 电阻率/(Ω·m) | |||
Ⅰ | >9 | >0.8 | >50 | >8.5 | >0.7 | >230 | <2.41 | >56 |
Ⅱ | 7~9 | 0.3~0.8 | 15~50 | 3.5~8.5 | 0.2~0.7 | 222~230 | 2.41~2.47 | 18~56 |
Ⅲ | 5~7 | 0.06~0.3 | <15 | <3.5 | <0.2 | 214~222 | 2.47~2.51 | <18 |