浅析川西坳陷须家河组古、今构造叠合圈闭的有效性

须家河组受多构造旋回、高古地温、早生排烃、储层致密等地质条件的制约，其圈闭具有形成早、演化强、隐蔽性大的特点。基于坳陷的油气地质特点，仅采用常规圈闭的静态研究方法难以正确认识非常规气藏的有效圈闭。因此，采取动态方法并结合典型气藏圈闭分析，发现与生排烃高峰期匹配、叠合后期构造并长期继承性保持的古、今构造叠合的复合圈闭是须家河组气藏的有效圈闭。

Validity of palaeostructure and current structural overlay trap in Xujiahe Formation of Chuanxi depression

Xujiahe Formation is influenced by multi structural cycles, high palaeo temperature, early hydrocarbon expulsion, and tight hydrocarbon reservoir, etc. The trap is featured by early formation, strong evolution and high concealment capacity. For thestatic research method based on conventional traps, it is difficult to determine effective traps of non-conventional hydrocarbon reservoir. Therefore, dynamic method and analysis of typical gas traps are used, and it is discovered that the compound traps, which match with peak period of hydrocarbon generation and expulsion and maintenance of palaeostructure and current structure for a long time, are the effective traps in Xujiahe Formation.