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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。
Above the unconformity at the bottom of Carboniferous in Tazhong area, from west to east, water potential decreases, oil physical properties become better, total salinity of oil field and divalent cation concentration and γNa / γCl decrease. These changes indicate that there is a freshwater hydrodynamic scouring in the area. In Tazhong No.4 structure, upwards from CⅢ oil group, the hydrogen and oxygen isotope values of water and oil in the oil field are positively offset to CⅠ oil group and turn light; indicating that freshwater is moving from bottom to top, and CⅠ oil Group CII significantly more affected. Oil, water chemical characterization results consistent.