石油与天然气地质 ›› 2022, Vol. 43 ›› Issue (2): 419-431.doi: 10.11743/ogg20220214
收稿日期:
2020-07-30
修回日期:
2022-01-11
出版日期:
2022-04-01
发布日期:
2022-03-11
第一作者简介:
李志强(1992-),男,工程师,油气地球化学与成藏机理。E?mail: 基金项目:
Zhiqiang Li(), Bo Yang, Jun Wang, Zijun Han, Qingxun Wu
Received:
2020-07-30
Revised:
2022-01-11
Online:
2022-04-01
Published:
2022-03-11
摘要:
南黄海盆地迄今未获商业性油气突破,或与对其中-新生界3套湖相烃源岩的发育模式和生烃史研究薄弱有关。对来自3套烃源岩的41块样本进行岩石热解、微量元素、X衍射和色谱-质谱分析后发现,泰州组二段腐泥组含量高,为Ⅱ1型干酪根,以水生有机质输入为主,C27甾烷占优,受海侵影响碳酸盐矿物含量高,古水体还原性强且盐度高,利于有机质保存;阜宁组二段和泰州组二段古水体环境相似,但C28甾烷含量显著增高,为藻类为主和陆源为辅的双重有机质输入,是典型的湖相烃源岩;阜四段的C29甾烷含量占绝对优势,TAR比值高,为单一的陆源有机质输入,古水体偏氧化性且盐度低,不利于有机质的保存。烃源岩复杂的母质输入类型和沉积环境不利于对其热成熟度的评价,对以甾烷20S/(20S+20R)或Ts/(Ts+Tm)参数表达的“未熟”特征应谨慎。基于断陷型-拗陷型的构造背景转换分析,建立了潜力生油层的生烃过程,认为活跃的火山活动对烃源岩生烃有促进作用,且北部坳陷以早期生烃为主,南部坳陷存在早、晚两期生烃,以三垛组沉积时期生烃为主。研究对南黄海盆地下一步的油气勘探部署具有重要指导意义。
中图分类号:
表1
南黄海盆地烃源岩干酪根显微组分含量"
井号 | 层位 | 样品总数/个 | 显微组分含量/% | ||||
---|---|---|---|---|---|---|---|
腐泥组 | 镜质组 | 壳质组 | 惰质组 | 类型指数 | |||
CZ-A | 阜四段 | 9 | 0 ~ 5.00 | 29.00 ~ 41.00 | 46.00 ~ 61.00 | 6.00 ~ 15.00 | 32.10 |
(2.30) | (33.00) | (54.80) | (9.80) | ||||
WX-B | 阜四段 | 6 | 0 ~ 4.00 | 28.00 ~ 37.00 | 56.00 ~ 64.00 | 6.00 ~ 14.00 | 37.35 |
(0.80) | (30.80) | (59.00) | (9.30) | ||||
CZ-B | 阜二段 | 9 | 2.00 ~ 6.00 | 29.00 ~ 36.00 | 52.00 ~ 69.00 | 2.00 ~ 12.00 | 28.30 |
(3.70) | (33.40) | (56.00) | (6.70) | ||||
ZC-A | 泰二段 | 9 | 75.00 ~ 85.00 | 4.00 ~ 12.00 | 5.00 ~ 14.00 | 2.00 ~ 7.00 | 79.98 |
(78.40) | (8.00) | (8.70) | (4.90) |
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