蓝尼罗河盆地喀土穆凹陷构造演化及烃源岩发育特征

发布时间：2018-02-21 23:34

本文关键词： 蓝尼罗河盆地喀土穆凹陷构造演化烃源岩沉积环境有机质类型热演化　出处：《中国海上油气》2017年05期 　论文类型：期刊论文

【摘要】：对蓝尼罗河盆地喀土穆凹陷构造演化特征进行了分析,重新厘定了构造演化阶段,并对主力烃源岩发育特征及油气来源进行了深入分析。研究表明:喀土穆凹陷的形成与演化受控于中非剪切带的活动,该凹陷经历了裂陷Ⅰ期、裂陷Ⅱ期及拗陷期等构造演化阶段。早白垩世裂陷Ⅰ期的强裂陷作用是湖相烃源岩发育的主要时期,综合烃源岩地化指标及油-源对比分析认为Abu Jinn组烃源岩为喀土穆凹陷的主力烃源岩。喀土穆凹陷Abu Jinn组烃源岩与穆格莱德盆地Abu Gabra组主力烃源岩沉积环境类似,为弱氧化-弱还原的沉积环境,且水体较淡。不同构造位置处Abu Jinn组烃源岩有机质类型和甾烷分布差别较大。Abu Jinn组烃源岩热演化程度主要受埋藏深度的控制,但火山活动促进了Abu Jinn组烃源岩的热演化,烃源岩成熟度受火成岩影响范围约为火成岩上下200 m范围。
[Abstract]:The structural evolution characteristics of Khartoum sag in Blue Nile Basin are analyzed, and the tectonic evolution stage is redefined. The development characteristics and hydrocarbon sources of the main source rocks are analyzed in depth. The results show that the formation and evolution of the Khartoum sag are controlled by the activities of the non-shear zone, and the sag has experienced the first stage of rifting. The strong rifting of the early Cretaceous rifting stage I is the main stage of the lacustrine source rock development. Based on geochemistry index of source rock and oil-source correlation analysis, it is concluded that Abu Jinn source rock is the main source rock in Khartoum sag. The sedimentary environment of Abu Jinn formation source rock is similar to that of main source rock of Abu Gabra formation in Muglad basin. It is a weak oxidation-weak reduction sedimentary environment, and the water body is relatively light. The thermal evolution degree of Abu Jinn source rock is mainly controlled by the buried depth, and the difference of organic matter type and sterane distribution between the source rocks of Abu formation and Jinn formation is quite large at different tectonic locations. However, volcanic activity promotes the thermal evolution of the source rocks of Abu Jinn formation, and the maturity of the source rocks is affected by igneous rocks in the range of 200m above and below igneous rocks.
【作者单位】：中海油研究总院;
【基金】：“十三五”国家科技重大专项“非洲重点区油气勘探潜力综合评价(编号:2017ZX05032-002)”部分研究成果
【分类号】：P618.13

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