摘要
玻利维亚Chaco盆地是安第斯山前陆盆地之一,盆地发现以天然气为主。结合该盆地的勘探历史与勘探现状,对相关钻井、地震及地化等资料进行综合分析,评价了该盆地的石油地质条件及其勘探潜力。Chaco盆地发育泥盆系Los Monos组与志留系Kirusillas组2套主力烃源岩,并分别于石炭纪与三叠纪开始成熟生烃,新近纪进入生气高峰期。2套主力烃源岩生成的天然气分别向下注入下伏储层Huamampamba组与Santa Rosa组,仅少部分向上注入其他储层聚集成藏。盆地内圈闭以逆冲背斜、背斜、断背斜为主。Chaco盆地西部褶皱冲断带(Subandean带)西部与山前带(Foothill带)为该盆地的2个重要勘探潜力区域。
The Chaco Basin is one of the Sub-Andean foreland basins with large gas discovery.Based on the historical cases and current exploration status,through comprehensive analysis of drilling and geochemical data,the petroleum geological factors and exploration potentials of the basin are evaluated.There are two main source rocks in the basin,i.e.the Los monos Formation and the Kirusillas Formation,both of which have entered the maturity windows in Carboniferous and Triassic,and the high maturity gas window in Neogene.Gas generated from the two source rocks charged into underlying reservoirs in the Huamampamba Formtion and Santa rosa Formation.Only a little of gas has moved into the overlying reservoirs.Anticlines,thrust anticlines and faulted anticline are often found as traps.Two zones are recommended as exploration targets after careful evaluation,i.e.the western Sub-Andean thrust fold belt and the foothill belt where deeper reservoirs such as those in the Huamampamba Formation and Santa rosa Formation are observed.
作者
马学立
刘深艳
盖海洋
李耀才
MA Xueli;LIU Shenyan;GAI Haiyang;LI Yaocai(Overseas Evaluation Center,CNOOC Research Institute Co.,Ltd.,Beijing 100028,China;Department of Exploration,CNOOC Limited,Beijing 100010,China;Changqing Division,China Petroleum Logging Co.,Ltd.,Xi′an 710201,China)
出处
《海洋地质前沿》
CSCD
2019年第10期36-42,共7页
Marine Geology Frontiers
基金
国家“十三五”科技重大专项“西非和南美海域重点区油气地质评价及关键技术研究”(2017ZX05032-001)
