塔中地区石炭系水文地质与流体非均质性研究

Carboniferous Hydrogeology and Fluid Heterogeneity in Central Tarim Basin

塔中地区石炭系底部不整合面之上，由西向东，总体上具有水势降低、原油物性变好、油田水总矿化度和二价阳离子浓度增高以及γＮａ／γＣｌ降低等趋势。这些变化规律说明该区存在淡水的水动力冲刷作用。在塔中４号构造上，由ＣⅢ油组往上，油田水氢、氧同位素值发生正偏移，至ＣⅠ油组又变轻；指示着淡水是自下而上运动的，且对ＣⅠ油组的影响较ＣⅡ明显。油、水化学表征结果与之一致。

In the west part of central Tarim basin,the highest hydraulic potentials are associated with the lowest TDS and amount of divalent cations,and with the highest γNa/γCl Toward east,the above parameters increase or decrease orderly They reflect recharge in the west along the C/S or C/O unconformitiy In the TZ4 structure,from C Ⅲ unit upward,hydrogen and oxygen stable isotopes are shifted positively,and toward C Ⅰ unit shifted negatively,indicating meteoric water flow upward and C Ⅰ unit are influenced more than C Ⅱ The conclusion drawn here is consistent with the changes of oil and water compositions