【摘要】 油田地下水与油气成藏关系密切，其成因及水化学特征反映了油气分布和富集规律。莫西庄地区侏罗系地层水总体为越流泄水浓缩高矿化特征，但部分测试产量较高单井的地层水反而呈现矿化度较低和钠氯系数、脱硫系数较高的情况，而矿化度异常高的单井无测试产量。论文通过地层水化学特征分析及碳氧同位素测试等进一步揭示地层水成因及与油气运聚分布的关系。莫西庄地区侏罗系地层水矿化度分布在0.71～78.62 g/L，平均值21.07 g/L,NaHCO₃型为主。地层水特征及生产动态表明，凝析水导致部分测试产量较高井的地层水矿化度偏低。凝析水是含气的重要标志。碳酸盐胶结物δ¹³C值分布在-20.13‰～2.40‰，δ¹⁸O值分布在-26.11‰～-17.50‰。地化特征表明，深部流体上涌导致局部地区矿化度异常高，如庄2井最高达78.62 g/L，大量的胶结物充填导致储层致密，不利于油气富集。更多还原

【Abstract】 Formation water is closely related to the hydrocarbon accumulation,and its genesis and hydrochemical characteristics reflect the distribution and enrichment of hydrocarbon.The Moxizhuang area is located in the cross-formation flow discharging area of Junggar Basin and the Jurassic formation water is generally characterized by concentration,but the formation water of some single wells with higher testing production shows low salinity and high sodium chloride coefficient and desulfurization coefficient,and other wells with abnormally high salinity have no test production.Through the analysis of the chemical characteristics of the formation water in Moxizhuang and the analysis of carbon and oxygen isotopes,the relationship between the genesis of the formation water and the distribution of hydrocarbon migration and accumulation is revealed.The salinity of Jurassic formation water in Moxizhuang area is 0.71～78.62 g/L,with an average of 21.07 g/L,and NaHCO₃ is the main type.The characteristics of formation water and production performance show that condensate water leads to low salinity of formation water in some wells with high testing yield.Condensate water is an important symbol of the gas accumulation.The δ¹³C values of carbonate cements are distributed between-20.13‰and 2.40‰,and the δ¹⁸O values are distributed between-26.11‰and-17.50‰.The geochemical characteristics show that the upwelling of deep fluid leads to high salinity.For example,the salinity of formation water in well Zhuang 2 can reach up to78.62 g/L.A large amount of cement filling leads to tight reservoir,which is not conducive to oil and gas enrichment.更多还原