岩性油气藏 ›› 2020, Vol. 32 ›› Issue (4): 5968.doi: 10.12108/yxyqc.20200406
杨文杰1,2, 胡明毅1,2, 苏亚拉图3, 刘昌4, 元懿1,2, 李金池1,2
YANG Wenjie1,2, HU Mingyi1,2, SUYA Latu3, LIU Chang4, YUAN Yi1,2, LI Jinchi1,2
摘要: 扇三角洲沉积砂砾岩体作为良好的油气储层,一直备受重视。为了深化对断陷盆地初始裂陷期扇三角洲沉积特征的认识,以松辽盆地苏家屯次洼火石岭组为研究对象,综合运用岩心、测井、三维地震资料和古地貌恢复技术,对初始裂陷期扇三角洲的发育规律、沉积特征和控制因素展开深入研究,建立了断陷湖盆初始裂陷期扇三角洲沉积模式。结果表明:①苏家屯次洼初始裂陷期发育东西双断的地堑式断陷湖盆,区内地形高差较大、构造运动活跃,沉积物源主要来自次洼西北、西南和东部等3个方向;②火石岭组形成时期广泛发育扇三角洲沉积体系,岩性以厚层杂色、灰色砂砾岩夹薄层灰色泥岩为主,测井曲线多呈高幅箱形或钟形,在地震剖面上多表现为斜交前积反射、楔状或丘状杂乱反射结构;③沉积体系展布受控盆断裂和古地貌控制,形成"中部凹陷带湖相、东西断阶带扇三角洲相"的沉积格局以及"中部生烃、两侧储集"的生储配置关系;④初始裂陷期构造活动是控制扇三角洲体系发育的主导因素,控盆断裂不仅控制着沉积相带和储层砂体的分布,也持续影响着断陷湖盆的沉积充填演化。该研究成果可为陆相盆地断陷深部的油气勘探提供地质依据。
中图分类号:
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