石油与天然气地质 ›› 2023, Vol. 44 ›› Issue (5): 1279-1289.doi: 10.11743/ogg20230516
史玉玲1,2(), 龙祖烈1,2, 张向涛1,2, 温华华1,2, 马晓楠1,2
收稿日期:
2023-03-30
修回日期:
2023-07-04
出版日期:
2023-10-19
发布日期:
2023-10-19
第一作者简介:
史玉玲(1987—),女,高级工程师,资源评价和油气运移成藏。E-mail:基金项目:
Yuling SHI1,2(), Zulie LONG1,2, Xiangtao ZHANG1,2, Huahua WEN1,2, Xiaonan MA1,2
Received:
2023-03-30
Revised:
2023-07-04
Online:
2023-10-19
Published:
2023-10-19
摘要:
基于地化分析明确了珠江口盆地恩平凹陷恩平17洼油气来源及分布特征,优选断层属性有效参数,定量评价了不同时期断层的输导性;借助MOVE软件再现了23.03 Ma以来主要层面的古构造形态,揭示了T70古构造面形态变化对纵向上及不同构造带间油气调整分配的影响,最终恢复了油气动态成藏过程,也预测了潜在的油气勘探方向。研究认为:恩平17洼原油主要来自始新统文昌组三段、四段及五段烃源岩,断距在100 ~ 130 m的断层可以向恩平组输导油气,断距大于130 m的断层有利于油气穿过恩平组向中、浅层垂向输导。恩平17洼油气经历了早期近源、中期南向、晚期南-北双向3个阶段的运聚过程,由于洼陷带晚期断层垂向输导油气能力较弱,使得恩平组成为纵向上及不同构造带间油气调整分配的枢纽。10.00 Ma之前,油气主要在T70古构造面之下近源运聚;10.00 ~ 5.33 Ma,油气主要沿恩平组输导层向南部构造带运聚;5.33 Ma之后,油气开始在洼陷带T70古构造面之下向北运移调整,整体油气运移趋势进入南-北双向运聚阶段。沿NW向构造脊发育的古近系构造圈闭及北部古隆起周缘恩平组构造-岩性或地层-岩性圈闭是今后较为有利的勘探方向。
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