摘要
松辽盆地地下水动力场具有明显的不对称性 :以盆地北端为主的盆地边缘是大气水下渗 向心流区 ;中央坳陷区为泥岩压实排水 离心流区 ;盆地南部以越流 蒸发泄水为主 ,只有盆地边缘和隆起的局部地区有间断性的大气水下渗作用。地下水动力场的基本特征决定了地下水化学场的分布规律。在成岩过程中 ,各种成岩反应具有不同程度的阶段性。离子的迁移与矿物转变、溶解和自生矿物的沉淀有关。深入研究砂岩的成岩反应 ,是分析孔隙水演化过程中离子迁移的重要环节。通过分析①成岩自生矿物中流体包裹体 ;②自生矿物的同位素组成 ;③成岩自生矿物的种类和序列 ;以及④地下水化学成分 ,可以进一步研究地下流体地球化学特征。
Hydrodynamics in the Songliao basin is asymmetrical obviously, with the characteristics of gravity-induced centripetal flow recharged by meteoric water mainly in its northern and northern-eastern regions, centrifugal flow and cross-formational in the basin center area, as well as cross-formational flow-evaporation in its southern area. That could be described as its planar division. Hydrodynamics constrains the origin of groundwater and its chemical properties. During diagenesis, ion migration is related with mineral transfer, dissolution and deposition. Therefore, the study of diagenetic reactions in sandstones is the key for the analysis of ion migration during porewater evolution. By analysis of ①fluid inclusions in authigenic minerals, ②isotopic content of authigenic minerals,③kinds of authigenic minerals and progressive diagenetic sequence, and ④present groundwater chemistry, we could study the geochemical properties of ground fluids.
出处
《矿物学报》
CAS
CSCD
北大核心
2002年第4期343-349,共7页
Acta Mineralogica Sinica
