哥伦比亚上马格达莱纳盆地油气地质特征

Petroleum geological features of Upper Magdalena Basin in Colombia

运用盆地分析及石油地质学的理论与方法,对哥伦比亚上马格达莱纳盆地的构造沉积演化及石油地质特征进行了综合研究,结果显示:盆地演化主要经历了裂谷发育、被动陆缘、前陆盆地和山间盆地发育4个阶段;主要烃源岩为被动陆缘阶段发育的Cenomanian-Santonian期Tetuan灰岩和La Luna灰岩,储集层为Albian期Caballos组三角洲相砂岩和Maastrichtian期Monserrate组三角洲—河流相砂岩,被动陆缘阶段Villeta群页岩和前陆盆地阶段发育的古新统Guaduala组泥岩为盆地区域性和局部盖层;油气运移和聚集主要发生在中新世,构造型和构造-地层复合型是盆地主要的油气田(藏)类型;中—东科迪勒拉山前逆冲带下及盆地内冲断层发育地带具有良好的勘探前景。

Using the methods and theories of basin analysis and petroleum geology,the structural evolution and petroleum geology feature of Upper Magdalena Basin in Colombia are comprehensively studied.The results show that the basin evolution experiences the four phases like rift development,passive margin,foreland and intermountain basin development.Main source rocks are Tetuan and La Luna limestones which are deposited in passive margin of Cenomanian-Santonian period.The major reservoir rocks are delta facies sandstone of Caballos Formation in Albian period and river-delta facies sandstone of Monserrate Formation Maastrichtian period,and the main regional cap rocks are Villeta Group shale deposited in passive margin and the mudstones of Guaduala Formation deposited in foreland area in Paleocene.Miocene is the key period for oil and gas migration and accumulation.The main types of oil and gas reservoir are structure and structure-stratigraphy.Future exploration potential may exist in obduction zones along the mountain fronts of central and eastern Cordilleras and the thrust belt of basin.