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乍得Bongor盆地基岩油气藏的发现是近年来海外油气田勘探的重大突破,在钻井岩心观察描述和薄片鉴定的基础上,开展了岩相学和地球化学研究,确定了Bongor盆地北部斜坡带岩浆岩岩石类型。岩浆岩地化特征均表现出稀土元素含量较高,轻稀土富集型,右倾稀土配分特征;微量元素富集Rb、Th、U;亏损Nb、Ta和Sr,出现明显的Nb-Ta谷;显示火山弧花岗岩的地化特征。
The discovery of bedrock reservoirs in the Bongor Basin, Chad has been a major breakthrough in exploration of overseas oil and gas fields in recent years. Based on the observation and description of the drilling cores and the identification of thin sections, lithofacies and geochemistry were studied and the magmatic rocks in the northern slope of the Bongor Basin Rock type. The magmatic rocks are characterized by higher REE content, light REE enrichment and right REE distribution. Trace elements are enriched in Rb, Th and U, while Nb, Ta and Sr are depleted in Nb-Ta valleys. Geochemical features of volcanic arc granite.