石油与天然气地质 ›› 2023, Vol. 44 ›› Issue (3): 662-674.doi: 10.11743/ogg20230311
收稿日期:
2023-02-22
修回日期:
2023-04-16
出版日期:
2023-06-01
发布日期:
2023-06-05
第一作者简介:
杜晓峰 (1974—), 男, 教授级高级工程师, 石油地质与勘探综合研究。E-mail:基金项目:
Xiaogfeng DU1(), Xiaojun PANG2, Xiaobo HUANG2, Bingjie WANG2
Received:
2023-02-22
Revised:
2023-04-16
Online:
2023-06-01
Published:
2023-06-05
摘要:
渤海海域辽西凹陷北部古近系沙河街组二段(沙二段)广泛发育滩坝砂体,油气测试获得高产,表明沙二段滩坝砂体勘探潜力巨大。但是,有关滩坝沉积的机制依然认识不清,严重制约了该类沉积的勘探评价,因此从源-汇系统理论出发进行滩坝沉积控制因素分析十分必要。利用岩心、录井、测井、粒度及铸体薄片等资料,结合三维地震和区域地质资料,对辽西凹陷北部沙二段源-汇系统及其对滩坝沉积的控制进行了研究。结果表明:①研究区沙二段沉积时期,燕山隆起的兴城河水系和月亮河水系为辫状河三角洲沉积提供物源,辫状河三角洲进一步为滩坝沉积提供了物源。由于兴城河水系和月亮河水系汇水区面积相对较小,主河流长度较短,形成的辫状河三角洲规模相对较小,小规模的辫状河三角洲为滩坝沉积提供物源的能力较弱。②辽西凹陷北部发育宽缓的古隆起,为滩坝沉积提供了有利的沉积古地貌条件。③水体较浅,物源供源能力较弱,波浪携带辫状河三角洲前缘砂体向湖盆方向搬运,受古隆起带较高地貌的阻挡,砂体在古隆起带沉积并形成细粒砂质滩坝,岩性以细砂岩与粉砂岩为主。随着湖平面的逐渐上升,滩坝发育程度逐渐减弱。④燕山隆起、兴城河-月亮河水系、凹中古隆起及湖平面共同控制了滩坝沉积的岩性和规模,是该地区取得油气勘探突破的关键要素。本次研究为渤海海域古近系油气勘探中滩坝砂体的预测提供借鉴。
中图分类号:
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