鄂尔多斯盆地北部上古生界储集岩的化学分类及储集性评价
Natural Gas Geoscience(2003)
Abstract
鄂尔多斯盆地北部上古生界的天然气储层为碎屑岩储层.这种储层虽然分布面积大,但非均质性强、天然气产能变化大.依据碎屑岩储层中主要造岩矿物SiO2含量的变化将鄂尔多斯盆地北部地区上古生界砂岩分为高硅型石英砂岩储层、次高硅型石英砂岩储层和硅铝型杂砂岩储层等3型储层.通过进行X萤光光谱、X衍射、核磁测试等室内分析后认为:高硅型和次高硅型石英(质)砂岩储层是鄂尔多斯盆地北部上古生界天然气的优质储层,并且是榆林气田、苏里格气田、乌审旗气田的主力储层.
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Key words
reservoir rock,reservoir assessment,upper palaeozonic,basin
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