乍得Bongor盆地潜山油气成因和成藏过程

发布时间：2018-04-03 20:09

本文选题：潜山　切入点：油气成因　出处：《石油学报》2017年11期

【摘要】：Bongor盆地前寒武系基岩潜山裂缝油藏的发现打开了非洲陆上油气勘探的新领域。潜山油源问题是制约Bongor盆地勘探进程的因素之一。为了解决这一问题,充分利用潜山原油有机地球化学分析测试数据,研究M-P区、B区潜山原油的生物标志化合物组成和地球化学特征,分析M-P区、B区潜山原油与M凹陷烃源岩和BN凹陷间的油源关系;结合Bongor盆地热演化史以及构造演化史,分析M-P区、B区潜山油藏带的油气成藏过程。研究结果表明:M-P区潜山原油主要来自M凹陷烃源岩,B区潜山原油接受M凹陷烃源岩和BN凹陷双重贡献。M凹陷烃源岩在晚白垩世中期开始向B区潜山带供烃,晚白垩世中期—晚期,M凹陷、BN凹陷烃源岩所生成的原油共同在B区潜山带聚集成藏,同时M凹陷烃源岩生成的原油在M-P区潜山带运移聚集形成潜山油气藏。
[Abstract]:The discovery of Precambrian bedrock buried-hill fractured reservoirs in Bongor basin opens up a new field of onshore oil and gas exploration in Africa.The problem of buried hill oil source is one of the factors restricting the exploration process of Bongor basin.In order to solve this problem, the composition of biomarker compounds and geochemical characteristics of buried hill crude oil in M-P area are studied by using the organic geochemical analysis and testing data of buried hill crude oil.The oil source relationship between buried hill crude oil and source rocks and BN sag in M sag is analyzed, and the hydrocarbon accumulation process in buried hill reservoir belt of Bongor basin is analyzed in combination with thermal evolution history and structural evolution history of Bongor basin.The results show that the buried hill crude oil in the Wei M-P area is mainly derived from the buried hill oil from the M sag source rock and the BN sag. The source rocks in the M sag began to supply hydrocarbon to the buried hill zone in the middle of the late Cretaceous.The source rocks generated from the source rocks of the mid-late Cretaceous to the late Cretaceous are accumulated in the buried-hill zone of area B, and the oil generated from the source rocks of the M depression migrates and accumulates in the buried hill zone of the M-P area to form a buried hill reservoir.
【作者单位】：长江大学资源与环境学院长江大学油气资源与勘探技术教育部重点实验室;中国石油勘探开发研究院;中国石油天然气勘探开发公司;
【基金】：国家重大科技专项(2011ZX05029) 中国石油天然气股份有限公司科技专项(2013D-0902)资助
【分类号】：P618.13

【相似文献】