OALib Journal期刊
ISSN: 2333-9721
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四川盆地震旦系灯影组天然气晚期成藏特征及意义
Keywords: 四川盆地,灯影组,晚期成藏,古隆起,天然气
Abstract:
?震旦系灯影组为四川盆地已发现天然气藏最古老的层系。四川盆地地质历史中经历了多旋回构造运动,但至今仍有大规模天然气藏存在,其重要原因之一是晚期成藏。通过对天然气组分、同位素及流体包裹体特征的分析,结合区域地质资料,得出四川盆地灯影组天然气晚期成藏具有3个显著特征:①广泛烃源(古油藏裂解气、水溶解析气)供给为晚期成藏提供物质基础;②气烃包裹体普遍发育反映喜马拉雅期天然气大范围充注;③喜马拉雅期油气重新调整、聚集,形成新气藏。依据喜马拉雅期构造变形特征,可将震旦系灯影组气藏分为3种类型:原生型、残存型和调整型,最有利的为原生型气藏,其次为调整型。对四川盆地震旦系等古老层系天然气勘探中应高度重视喜马拉雅运动对成藏的影响,其中构造相对稳定的古隆起区及斜坡带具有良好的保存条件,是勘探的有利区。
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