廊固凹陷旧州—固安构造带沙三段层序地层特征与油气成藏关系

Relationship between formation characteristics of Sha3 Member sequence in Jiuzhou-Gu'an structural belt of Langgu depression and hydrocarbon accumulauion

将层序地层学理论与油气成藏理论相结合,从层序特征和生储盖组合等方面探讨了该区层序地层特征与油气成藏模式.研究表明,旧州—固安构造带沙三段主要由4个三级层序组成,层序地层格架内的烃源岩和储集岩都有一定的分布规律,烃源岩主要分布在SQ1、SQ2、SQ3的湖侵体系域,储集岩主要分布在低位体系域和高位体系域,形成了2个有利的生储盖组合,层内主要有4种油气藏成藏模式。

Based on sequence stratigraphy theories and hydrocarbon accumulation theories, this paper discusses the sequence stratigraphy features and hydrocarbon accumulation modes in this area. The research indicates that Sha3 Member in Jiuzhou-Gu＇ an structural belt is mainly consisted of 4 3rd order sequences, and the source rocks and reservoirs in sequence stratigraphy framework distribute under certain rules. The source rocks mainly distribute in lacustrine ingression system of SQ1, SQ2 and SQ3, and reservoirs mainly locate in lower system and upper system. Two favorable accumulation - storage - seal assemblages have been formed, and there are 4 main kinds of hydrocarbon accumulation modes in the formation.