东南亚地区成藏组合特征及勘探潜力

The petroleum play characteristics of the Southeast Asia region and exploration potential

东南亚地区是世界上重要的产油气区之一,构造演化极其复杂,盆地类型多样,主要发育主动陆缘型盆地、克拉通盆地、被动陆缘型盆地和前陆盆地等4种类型。在综合研究区域地质资料基础上,运用成藏组合的概念及划分原则,对东南亚14个重要的含油气盆地进行成藏组合划分及特征描述,以成藏组合为评价单元,运用发现过程法对各盆地待发现资源量进行预测。研究成果认为:(1)东南亚盆地大致可以划分为中生界成藏组合、前第三系基底成藏组合、古近系成藏组合和新近系成藏组合等4个成藏组合;(2)待发现资源量最大的4个盆地为库特盆地、文莱—沙巴盆地、东爪哇盆地和泰国湾盆地,待发现资源量最大的成藏组合为新近系成藏组合;(3)东南亚地区陆上盆地勘探程度高,近海勘探为近期重点勘探领域,深海勘探和成熟探区新层系及岩性-地层油气藏为未来的勘探方向。

Southeast Asia is one of the most important oil and gas producing regions in the world. It underwent complicated structural evolution and formed various types of basins including active continental margin basin, intracratonic basin, passive continental margin basin and foreland basin. Based on the study of the regional geological data, applying the concept of the petroleum play and subdividing principle, the petroleum plays are classified and described in the fourteen main basins in the Southeast Asia. Applying petroleum play as evaluating unit and introducing discovery process simulation model, the undiscovered resource is predicted in those basins. The study reveals that four petroleum plays, which include Mesozoic play, Pre-Tertiary basement play, Eogene play and Neogene play, are classified in the basins in the Southeast Asia. The biggest undiscovered resource is in the Kutei basin, Brunei-Sabah basin, East Java basin and Gulf of Thailand basin. Among the four plays, the Neogene play contains the biggest undiscovered resource. Exploration degree of onshore basins is high in the Southeast Asia and offshore basins have become important exploration areas recently. The deepwater region and some new target formations in the matured basin and lithologic-stratigraphic reservoirs are the future exploratory trend.