Qom盆地油气成藏系统初步分析

对伊朗中部Qom盆地中、下侏罗系统Shemshak组和渐新统—中新统Qom组两套烃源岩的有机质半度、类型、成熟度及油源对比等地球化学分析表明Shemshak组烃源岩为一套有效的烃源岩层系，Qom组为一类潜在的烃原岩层系。Shemshak组烃源岩在早白型世开始进入生烃门限，大约在距今17Mn时进入湿气和凝析油阶段，上新世早期盆地的快速沉降使侏罗系烃源岩达到过成熟阶段。Qom盆地即存在以Shemshak组（及Qom组）为烃源岩的新近系油气藏，也能存在Shemshak组原生油气藏。

Petroleum system in Qom Basin, Iran

The abundance, types and maturity of organic matter in Shemshak Formation of Jurassic and Qom Formation of Oligocene-Miocene, and oil source correlation in Qom Basin, Iran, show that the Shemshak Formation is the most possible source rock for the playing and the Qom Formation has hydrocarbon generation potential. The organic matter of the Shemshak Formation entered into oil window in the Early Cretaceous, and evolved into wet gas and condensate window in about 17 Ma. At the early of Pliocene, the rapidly subsidence of Qom Basin brought on the oil window entrance of Qom Formation and the over maturation of Shemshak Formation. There are Neogene oil and gas accumulation derived from Shemashak Formation and Qom Formation, or primary oil-gas pool in Shemshak Formation in the Qom Basin.