摘要
准噶尔盆地西北缘分为超覆尖灭带、断阶带、斜坡区。本文讨论了不同区带地层水化学特征及其与油气运移聚集的关系。研究结果表明 ,高、过成熟阶段烃源岩生成的轻质油气在其运移聚集过程中 ,伴生的CO2 进入地层水中 ,在一定条件下会形成高矿化度NaHCO3 型地层水 ,而以高矿化度NaHCO3 型地层水为底水的油藏 ,原油密度较轻 ,为轻质原油。在近断层处 ,中、高矿化度的MgCl2 、Ns2 SO4 型地层水 ,可作为油气水沿断裂运移的证据。
The northwestern parts of the Junggar Basin may be classified as the overlying pinch\|out zone, fault zones and slope zones. The paper discusses the chemical characteristics of formation water and their relation with oil/gas migration and accumulation. It is found that highly\|mineralized NaHCO\-3\|typed formation water was formed from accompanied CO\-2 entering formation water, when light oil/gas generated from highly mature source rocks migrated and accumulated. Moderately to highly mineralized Na\-2SO\-4\|typed formation water is the evidence of oil/gas migration along faults.
出处
《地质地球化学》
CSCD
北大核心
2000年第3期54-58,共5页
Geology-Geochemistry
基金
新疆石油管理局!<准噶尔盆地三次资源评价>项目的部分成果
关键词
地层水
断层
通道
准噶尔盆地
油气运移
化学
formation water
highly mineralized NaHCO_3-typed formation water
fault
migration path
Junggar Basin
