CO2与砂岩相互作用机理与形成的自生矿物组合

被引：10

作者：

高玉巧

刘立

曲希玉

机构：

[1] 吉林大学地球科学学院

来源：

新疆石油地质 | 2007年 / 05期

关键词：

CO2; 砂岩; 作用; 机理; 自生矿物;

D O I：

暂无

中图分类号：

P618.13 [石油、天然气];

学科分类号：

0709 ; 081803 ;

摘要：

当CO2以天然方式或人工方式注入到含水砂岩时,成岩流体将转变成弱酸性流体,引起宿主砂岩中不稳定矿物(如碳酸盐、长石)的分解和新矿物的沉淀,进而使砂岩的孔隙度、渗透率和地层水地球化学特征发生改变。CO2注入砂岩后,仅有少量CO2溶解于水中以气体形式存在,大部分CO2以次生矿物形式(如方解石、白云石、菱铁矿等)被"固化"在宿主砂岩中,形成的典型自生矿物组合为:片钠铝石±含铁碳酸盐矿物±其它碳酸盐矿物组合和铁白云石+高岭石+自生石英组合。其中,前一种矿物组合是示踪CO2运移、聚集的典型自生矿物组合。CO2与砂岩相互作用机理及形成的自生矿物组合研究不仅拓宽了沉积盆地中流体-岩石相互作用研究领域,揭示了深部流体与浅部储集层之间、浅部烃源岩或其它岩石与附近储集层之间的物质转移,而且为储集砂岩品质评价、CO2气藏(田)预测、CO2地下储存等研究提供了基础地质信息。

引用

页码：579 / 584

页数：6

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