中文摘要：

以塔木察格盆地火山碎屑岩（流纹质凝灰岩、沉凝灰岩）为研究对象，通过密闭容器中地层水一火山碎屑岩相互作用的水热实验，研究了不同温度下碱性地层水对火山碎屑岩成分的改造。研究显示：在碱性地层水作用下。火山碎屑岩以石英溶解为主．且随着温度的升高，石英的溶解度逐渐加大，而长石及碳酸盐矿物的溶蚀较弱；同时，通过扫描电镜（SEM）的观察发现：流纹质凝灰岩在100，120，140，160℃下样品表面有钙十字沸石生成；沉凝灰岩在100℃时有方解石生成，在120℃和180℃时样品表面有钙十字沸石生成。结合南贝尔凹陷石英保存完好，长石、碳酸盐矿物溶蚀溶解较强的特征，表明碱性流体对该区火山碎屑岩次生孔隙贡献较少。

英文摘要：

The hydrothermal experiments of volcanic clastic rocks chosen from the Nanbeier Sag of the Tamtsag Basin and formation water were researched under different temperatures in a closed container. The results show that quartz can be dissolved by alkaline formation water and the dissolution intensity will be enhanced with the in- creasing of temperature; on the contrary, the dissolution degree of feldspar and calcite is very low. Meanwhile, by scanning electronic microscope （ SEM）, phillipsite is found on the surface of rhyolitic tuff sample （ at the tem- perature of 100,120,140 and 160 ℃ ） and sedimentary tuff sample （ at the temperature of 120 and 180 % ） ; cal- cite is found on the surface of sedimentary tuff at 100 ℃. Considering the good preservation of quartz and strong dissolution of feldspar and carbonate, it is proved that the formation water contributes few to the secondary poro- sity ＇of the Nanbeier Sag of the Tamtsag Basin.