摘要
判断油气藏保存条件的优劣,除了盖层和断层封闭性之外,还有油气水的化学特征,如地层水的交替或油气散失。通过对川东北地区地层水的水型、矿化度、水性系数等参数的综合分析认为,川东北宣汉—达县地区与通江—南江—巴中地区的地层水具有矿化度高和氯镁系数越大,变质系数、脱硫系数和碳酸盐平衡系数就越小的特点。矿化度、水性系数及水型的变化具有很好的一致性,表明该区存在有利于油气保存的水文地质条件。
Conditions uf hydrocarbon accumulation and preservation in reservoirs behave in chemistry of formation water be sides sealing of caps and faults. The types, salinity of mineralization and coefficients of formation water may indicate the preservation condition of hydrocarbon in an area. Comprehensive chemical analysis of the formation water from A and B structural areas in northeast part of Sichuan Basin shows that the higher TDS and rCl^-/rMg^2＋ ratios are, the lower rNa^＋/rCl^-, （rSO4^2-×10^2）/rCl^- and （rHCO3^- ＋CO3^2＋）/rCa^2＋ ratios are. The changes of TDS and types of formation water keep a good accord with the coefficient of formation water, which shows that there is good sealing condition for hydrocarbon preservation in the studied areas.
出处
《海相油气地质》
2006年第4期29-33,共5页
Marine Origin Petroleum Geology
关键词
四川东北
二叠纪
三叠纪
侏罗纪
地层水
水化学特征
油气保存条件
Formation water
Hydroearbon preservation
Preservation condition
Permian
Triassic
Northeastem of Sichuan basin
