吉林大学学报(地球科学版) ›› 2016, Vol. 46 ›› Issue (3): 702-710.doi: 10.13278/j.cnki.jjuese.201603108
韦丹宁, 付广
Wei Danning, Fu Guang
摘要:
为了研究含油气盆地中断裂对油气成藏与分布的控制作用,在断层侧向封闭机理及影响因素研究的基础上,对反向断裂下盘较顺向断裂上盘更易富集油气的机理进行了定量解释。结果表明,无论是反向断裂还是顺向断裂,均源于断层岩封闭油气,断层岩油气运移方向排替压力是影响其侧向封闭油气能力的主要因素。在断裂埋深、断裂倾角和地层岩性、地层倾角相同的条件下,理论上反向断裂断层岩泥质体积分数大于顺向断裂断层岩泥质体积分数,即反向断裂断层岩油气运移方向排替压力大于顺向断裂断层岩油气运移方向排替压力,反向断裂侧向封闭能力强于顺向断裂侧向封闭能力,造成反向断裂下盘较顺向断裂上盘更易富集油气。歧口凹陷板桥断裂下盘沙一段下部断层岩在反向条件和顺向条件下油气运移方向排替压力的实例研究结果表明,反向条件下较顺向条件下在油气运移方向有更高的排替压力,侧向封闭能力更强,更有利于油气在板桥断裂下盘沙一段储层中富集。
中图分类号:
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