摘要
吉拉索尔油田位于西非安哥拉17号深水区块,水深1200～1400m,距安哥拉海岸150km。1996年发现,2001年产油,是安哥拉投入开发的第一个深水油田。油田面积约140km2,地质储量约为15.5×108bbl,可采储量约7.25×108bbl,为轻质油。油田所在的下刚果盆地主要经历了裂谷期、过渡期和热沉降期三个阶段的构造演化,相应沉积了裂谷期陆相地层、过渡期蒸发岩层和热沉降期海相地层。主要烃源岩为下白垩统Bucomazi组湖相页岩,有机质丰度高,类型好,成熟度适中,为很好的烃源岩。盆地深水区主要储层为上渐新统—中新统河道充填浊积砂岩复合体,砂岩固结差,物性良好。吉拉索尔油田主要由几个河道浊积砂岩复合体叠置组成,其中夹几个薄层席状砂岩,复合体之间被海相泥页岩分隔。上覆第三系泥岩为其主要盖层。
Girassol Oil Field in Lower Congo Basin, located at offshore Block 17 with water depth of 1250-1400m, is 150km far from the coast of Angola in Africa.. It was discovered by ELF Corp. in 1996 and oil （light oil） yield began in late 2001. It is the first deepwater field that was put into production in Angola. The field covers an area of about 140km^2 and has about 1550 MMBO of oil reserves in-place and estimated 725 MMBO of recoverable reserves. Corresponding to three tectonic evolution stages of rifting, transition and thermal depression undergone in Lower Congo Basin, continental, evaporite and marine sequences deposited. Lower Cretaceous Bucomazi lacustrine shale is the excellent source rock with a high TOC value and moderate maturity （Type- Ⅰ kerogen）. Main reservoir is the Upper Oligocene-Miocene superimposed turbiditic complex interbedded with several thin-layered sandstone and marine mudstone and shale in channels.The reservoir is characteristic of good property due to poorly-consolidated sandstone.
出处
《海相油气地质》
2007年第1期37-42,共6页
Marine Origin Petroleum Geology
