巴布亚盆地晚古生代—新生代构造演化与油气成藏条件

摘要

为了进一步系统研究巴布亚盆地构造特征及演化史,分析其勘探远景,通过对二维地震资料进行解释,并结合地球化学特征,分析盆地构造演化与油气成藏条件的关系.分析构造演化对盆地中、新生界主力烃源岩Imburu组、Koi-Iange组、Barikewa组及Magobu组和背斜圈闭与断层圈闭两大构造圈闭发育的控制作用,在此基础上提出古生新储—垂向排烃—多期次成藏的成藏模式.研究结果表明:巴布亚盆地经历了陆内裂谷阶段、冈瓦纳大陆裂解阶段、珊瑚海扩张阶段、美拉尼西亚岛弧碰撞阶段共4期多旋回的构造演化阶段.%In order to research tectonic characteristics and evolutions and analyze the exploration prospect, the relationship between the tectonic evolution and hydrocarbon accumulation conditions was analyzed based on the interpretation of the 2D seismic data. The tectonic evolution of Papuan basin on the control action of the Mesozoic-Cenozoic hydrocarbon source rock, Imburu Fm, Koi-Iange Fm, Barikewa Fm and Magobu Fm and the tectonic traps of anticline and fault was analyzed. The patterns of hydrocarbon accumulation for generation were proposed from Mesozoic and accumulation in Cenozoic to vertical hydrocarbon expulsion and multiple accumulation. The results show that Papuan basin undergones tectonic evolution of four polycyclic tectonic evolution stages, i.e. intracontinental rift, gondwana continent dissociation, the Coral Sea expansion, Melanesia arc collision.