伊拉克中东部盆地油气成藏特征及勘探潜力

通过对伊拉克的区域构造背景与地层充填序列分析，明确被动大陆边缘期和前陆盆地发育期是伊拉克油气形成的主要时期。在评价与类比伊拉克中东部油气盆地的基础之上，详细分析典型油气田成藏特征，总结出迪卜迪拜盆地和伊拉克北扎格罗斯褶皱带石油地质条件形成整体上呈现南早北晚的规律，而区域构造演化和沉积充填期次是主要的控制因素。其中，南部的迪卜迪拜盆地和中部的美索不达米亚盆地油气聚集成藏时期以晚中生代—古近纪为主，相对较早。北部的扎格罗斯盆地受晚中新世扎格罗斯造山运动的影响，油气藏最终定型较晚。另外，通过分析伊拉克中东部含油气盆地的成藏特征，指出北部的扎格罗斯褶皱带勘探潜力大于美索不达米亚和迪卜迪拜盆地，渐新统的砂岩是主要勘探对象。伊拉克中西部和西北部沙漠地区以发育古生界志留系的Akkas含油气系统为主。

Oil`gas reservoirs features and exploration potential of Iraq`s central-eastern basins

Iraq is one of the most petroleum rich countries in the Middle East, displaying differential in petroleum geology and distribution. Regional tectonics and stratigraphic succession show that passive continental margin and foreland phases are the major stages for generating hydrocarbon. After evaluating and comparing the central and eastern basins, this paper analyzes the features of typical reservoirs and concludes that tectonics and depositional evolution are the key factors controlling development of petroleum geology. And it also displays that it is earlier for hydrocarbon generation in southern Iraq than in northern Iraq. The main periods of hydrocarbon generation and accumulation in Dibdibah sub basin and Mesopotamia foredeep are from Mesozoic to Paleogene. Because of tectonic deforming at late Miocene, the hydrocarbon reservoir forming is later in North Iraq Zagros. The exploration potential in North Iraq Zagros is better than in Dibdibah sub basin and Mesopotamia foredeep. The Akkas hydrocarbon system, distributing in central and northwestern Iraq desert, is the further prospecting area.