亚诺斯盆地油气地质特征及有利区带预测

对哥伦比亚 亚诺斯盆地的地层与沉积、构造与演化以及石油地质等特征进行了综合研究。亚诺斯盆地的主要烃源岩为瓜达卢佩组K2)的海相页岩和碳酸盐岩，主要油气储集层为上白垩统至渐新统的滨浅海相和河流-三角洲相石英砂岩,区域性盖层为中新世莱昂组厚层页岩,油气主要运移期和聚集期发生在中新世以后,油气圈闭分为第三系圈闭群、白垩系圈闭群和逆掩前缘带第三系与白垩系复合圈闭群，圈闭形成期是晚白垩世至中新世早期。综合分析认为，亚诺斯逆掩前缘带为有利目标区,阿瑞阿培地堑与巴里纳斯地区为较为有利的目标区，亚诺斯坳陷与阿劳卡地堑为具备一定勘探潜力的目标区。

Petroleum Geology and Favorable Zones for Hydrocarbon Exploration in Llanos Basin,Colombia

An integrated study on lithology , sedimentology,structural evolution and petroleum geology in Llanos basin of Col ombia is made.The chief source rocks are Guadalupe(K 2 )marine shale and carbonate rocks,major reservoir rocks are the shore-riv er-delta quartzose sandstone of Upper Cretaceous to Oligocene,and regional cap rocks are Miocene Leon thick shale.The principal period for hydrocarbon migrat ion and accu-mulation occur after the Miocene.The traps are classified into t hree types:Tertiary trap group,Cretaceous trap group and composite trap group between Tertiary and Cretaceous in overthrust frontal belt.Late Cretaceous to E arly Miocene is the period of these traps formation.It is suggest-ed by compre hensive analysis that Llanos overthrust frontal belt is the favorable area for p etroleum exploration,followed by the Apiari graben and the Barinas depression, and the Llanos depression and Arauca graben are of certain potentials for hydroc arbon prospecting.