岩性油气藏 ›› 2020, Vol. 32 ›› Issue (4): 4858.doi: 10.12108/yxyqc.20200405
隋立伟
SUI Liwei
摘要: 为研究海拉尔-塔木察格盆地塔南凹陷铜钵庙组和南屯组的油气分布,应用三维地震和钻井资料,通过盆地构造建模恢复古地貌特征,明确不同地质历史时期古地貌对沉积体系及油气分布的控制作用。结果表明:①铜钵庙组沉积期,塔南凹陷具有"泛洼槽多物源"的特征,物源主要来自NW-SE向扇三角洲和WS向凹陷古隆起。南屯组沉积期全区发育4个规模较大的沉降中心,从西次凹逐渐向凹陷中心发生迁移。②铜钵庙组主要发育冲积扇、扇三角洲和滨浅湖沉积,凹陷内部古隆起控制了冲积扇的形成与分布。南屯组主要发育三角洲、扇三角洲、近岸水下扇、湖底扇和湖相沉积,古隆起、古坳陷分别控制了近岸水下扇的形成与烃源岩的展布范围。③塔南凹陷古地貌对油气分布的控制作用表现为"古隆-坡控储、古坳陷控源、古断-坡控藏"。西部为"源-储对接"、"古断-坡"组合控运聚的构造油藏,东部为陡坡控制下以近岸水下扇和湖底扇为储集体的岩性油藏,古地貌演化特征和"古断-坡"组合对源、储空间配置及油气运聚起决定性作用。该成果对认识塔南凹陷油气分布规律具有重要的指导意义。
中图分类号:
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