西非塞内加尔盆地深水区油气地球化学特征与油气成藏  

Petroleum Geochemical Characteristics and Accumulation in Offshore of Senegal Basin

作　　者：孙涛 王建新 孙玉梅 

机构地区：[1]中海油研究总院,北京100028

出　　处：《沉积学报》2017年第6期1284-1292,共9页Acta Sedimentologica Sinica

基　　金：中海油研究总院"油气地球化学技术应用与发展子项(2016)"(2016T-KT14)~~

摘　　要：塞内加尔盆地是西非面积最大、勘探程度最低的含盐被动大陆边缘型盆地。2010年之前仅有少量非商业性的油气和重质油发现,近几年在深水区获得油气勘探的重大突破。对深水区油气进行详细地球化学分析及油源对比,结果表明:深水区发育下白垩统阿普特—阿尔布阶和上白垩统赛诺曼—土伦阶两套烃源岩,下白垩统阿普特—阿尔布阶烃源岩的碳同位素组成偏轻,含硫量低,处于成熟—高成熟演化阶段,局部达到过成熟演化阶段;上白垩统赛诺曼—土伦阶烃源岩碳同位素组成偏重,含硫量中等,处于低成熟度—成熟演化阶段。油源对比的结果显示深水区F-1井阿尔布阶储层原油来自阿普特—阿尔布阶烃源岩,F-1土伦阶储层原油来自赛诺曼—土伦阶烃源岩,而S-1井阿尔布阶储层油样性质介于二者之间,为混源的原油。Senegal Basin is the largest passive margin basin with salt in western Africa,but it has limited petroleum exploration activities. Only non-commercial petroleum and heavy oil have been discovered before 2010. However,some oil exploration breakthroughs have been made in offshore area in recent five years. The paper analyzed the oils and source biomarkers as well as source rocks rock hydrocarbon potential. The results show that Aptian-Albian and Cenomanian-Turonian source rocks exist in offshore area. The former is characterized by light δ13 Corgand lower Sulfur content. The maturity is at oil window or more. The latter is typical of heavy δ13 Corgand medium sulfur content. The maturity is at oil window or low. Oil-source correlation indicates that F-1 Albian oil was generated from Aptian-Albian source rocks and F-1 Turonian oil from Cenomanian-Turonian source rocks. While the S-1 Albian oil shows mix sources characteristics.

关 键 词：塞内加尔盆地 油气地球化学 油源对比 

分 类 号：P618.1[天文地球—矿床学]