【摘要】 随着勘探的深入及地震资料品质的提高,在歧口凹陷歧北构造带和沙西裙边带上均识别出一种被称为"包心菜"的构造样式。为了深入剖析两个构造带"包心菜"构造的形成机制和演化过程,并查明其油气富集特点,从构造几何学特征入手,结合地层展布、断层类型和花心迁移特点等方面对其进行了深入研究。结果表明:沙西"包心菜"构造的形成与油气富集特点不同于歧北"包心菜"构造。歧北"包心菜"构造具有晚期形成、晚期成藏的特点,勘探有利层系为中浅层;沙西"包心菜"构造受控于边界正断层的伸展滑脱作用,构造演化经历了早期被动挤压上拱阶段、中期构造稳定热沉降阶段和晚期新构造运动3个阶段,具备两期成藏的条件,但东营组厚层泥岩影响了浅层油气成藏,勘探有利层系为中深层。更多还原

【Abstract】 With the advance of exploration and development of seismic data quality,we discovered a tectonic style called "cabbage"structure in Qibei and Shaxi tectonic zone of Qikou Sag. Applying the geometric characteristics,stratigraphic distribution,fault type and the migration of flower’s centre,we have made clear of the formation mechanism and hydrocarbon enrichment of "cabbage"structure in the two zones. The results show that the "cabbage"structure in Qibei tectonic zone formed in the period of neotectonic movement. Shaxi tectonic zone controlled by extension has experienced three stages,including extrusion uplift,thermal subsidence and neotectonic movement. The difference of tectonic evolution leads to the difference of hydrocarbon accumulation. Qibei tectonic zone has the characteristics of late-stage accumulation. Mid-shallow strata is favorable section. Meanwhile Shaxi tectonic zone has two periods of reservoir-forming,the mid-deep strata is favorable section as the influence of thick shale in Dongying Formation.更多还原