东尼日尔盆地群上白垩统Donga组沉积体系及勘探潜力
袁圣强 , 姜虹 , 汤戈 , 肖坤叶 , 刘邦 , 潘春浮 , 王海荣 , 毛凤军 , 郭郁 , 周川闽
地球科学 ›› 2023, Vol. 48 ›› Issue (02) : 705 -718.
东尼日尔盆地群上白垩统Donga组沉积体系及勘探潜力
The Sedimentary System and Hydrocarbon Potential of Upper Cretaceous Donga Formation, East Niger Basin Group
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东尼日尔盆地群属于西非裂谷系.基于地震、钻井、井壁取心和地球化学分析数据等资料,针对下组合新层系Donga组,从沉积体系分析入手,探讨其成藏组合和勘探潜力.Donga组为晚白垩世海侵背景下发育的一套正旋回沉积层序,下粗-中上部细,顶部发育薄层碳酸盐岩.该层序在东尼日尔盆地群跨多个盆地广泛发育和连续沉积,预示着晚白垩世盆地群形成了暂时统一盆地.海侵事件显著影响了晚白垩世的沉积体系,控制了其含油气系统发育和油气成藏.Donga组广泛沉积的泥岩为有效烃源岩和盖层.Donga组主要发育侧向对接供烃“上生下储”和“自生自储”成藏模式.储层是Donga组成藏主控因素,盆地群埋藏适中、近物源的北部和东南部边缘相带储层发育,具备较好勘探潜力.
东尼日尔 / Termit盆地 / 上白垩统 / 沉积体系 / 油气潜力 / Donga组 / 石油地质
Eastern Niger / Termit basin / Upper Cretaceous / sedimentary system / hydrocarbon potential / Donga Formation / petroleum geology
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中国石油股份有限公司科学研究与技术开发项目“海外复杂裂谷盆地精细勘探关键技术研究”(2021DJ3103)
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