吉林大学学报(地球科学版) ›› 2021, Vol. 51 ›› Issue (2): 336-354.doi: 10.13278/j.cnki.jjuese.20200083
• 地质与资源 • 上一篇
廖文毫1, 陈冬霞1, 曾溅辉1, 姜文亚2, 刘子驿1, 朱传真1, 王艺帆1
Liao Wenhao1, Chen Dongxia1, Zeng Jianhui1, Jiang Wenya2, Liu Ziyi1, Zhu Chuanzhen1, Wang Yifan1
摘要: 在陆相断陷盆地中,断裂与砂体是构成油气运移输导网络的主要要素。为了探究断砂组合输导条件控制下的油气运聚规律,本文对歧口凹陷埕北断阶区的断砂组合样式进行了划分,并通过断裂、砂体输导性的定量评价分析了不同样式断砂组合对油气运移成藏的控制作用。结果表明:依据断裂在油气成藏过程中的主要作用不同,划分了油源断裂与多套砂体上下叠置组合、输导断裂与砂体顺向或反向阶梯式组合、调节断裂与砂体"Y"字型组合,共3类4种断砂组合样式,在空间上形成了"接力式"的成藏模式。断砂组合对油气富集的控制作用主要体现在3个方面:①控制了油气藏的类型;油源断裂与多套砂体上下叠置组合主要控制形成岩性-构造、断块类油气藏,输导断裂与砂体顺向或反向阶梯式组合控制形成断块、断鼻和复合类油气藏,调节断裂与砂体"Y"字型组合控制形成断块类油气藏。②控制了油气的运移过程;油源断裂根部与大面积砂体组合沟通深层烃源,在油源断裂活动时,油气先沿断裂运移至浅层,并远距离运移至断阶区高部位富集,输导断裂与砂体顺向或反向阶梯式组合为油气提供阶梯式垂向-侧向运移通道,调节断裂与砂体组合则对油气富集起再调节分配作用。③控制了油气的聚集部位;当断裂输导概率f >50%,砂地比>0.50时,断砂组合起完全输导作用。在中浅层,油气沿输导断裂运移,输导断裂封堵性控制成藏;在中深层,油气富集程度则与砂地比值成正相关。
中图分类号:
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