南苏门答腊盆地M区块古近系烃源岩特征及评价

通过对南苏门答腊盆地M区块古近系烃源岩样品进行地球化学综合研究表明: 该区古近系烃源岩有机碳含量较高；烃源岩显微组分中以镜质体为主，其次为腐泥组+壳质组，惰质体组分含量较少；烃源岩有机质类型较好，为Ⅱ₁型、Ⅱ₁/Ⅱ₂混合型、Ⅱ₂型\,Ⅲ型干酪根，具有生油、生气双重性质；R_O值的分布范围为0.44%～0.71%，平均值为0.62%，有机质处于未成熟-成熟热演化阶段。受烃源岩有机质类型及其成熟度的影响，研究区内普遍存在“上油下气”的油气藏纵向叠合模式。因此，建议在研究区内实施“浅层找油、深层探气、油气并举”的油气勘探部署方案。

Geochemistry and Petroleum Generation Evaluation of Paleogene Source Rock in M Block of South Sumatra Basin

The geochemistry of the Paleogene source rock in the M block of south Sumatra basin is studied in this paper.The results show that the total organic content of Paleogene source rock in this block is high.Vitrinite is the dominant micro-petrological unit,sapropelic and liptinite is secondary,and inertinite is little.Kerogen type is Ⅱ₁ ,mixing of Ⅱ₁ and Ⅱ₂,Ⅱ₂,and Ⅲ.The source rocks have ability to produce oil or gas.The values of R_O range from 0.44% to 0.71%,with average value of 0.62%.The thermal maturity indicates that source rock is at immature and mature stage.The distribution of oil at the top and gas at bottom occurs vertically in this block due to type of organic matter and thermal maturity of source rock.So we propose that the shallow layer for oil and deep zone for gas would be paid to attention. 