石油与天然气地质 ›› 2023, Vol. 44 ›› Issue (2): 418-428.doi: 10.11743/ogg20230213
收稿日期:
2022-08-08
修回日期:
2022-12-22
出版日期:
2023-03-17
发布日期:
2023-03-17
第一作者简介:
李威(1988—),男,高级工程师,油气地球化学与油气成藏机理。E?mail: 基金项目:
Wei LI(), Jianyong XU, Zhifeng LIU, Youchuan LI, Wenqi ZHU
Received:
2022-08-08
Revised:
2022-12-22
Online:
2023-03-17
Published:
2023-03-17
摘要:
秦皇岛29构造带是渤海海域为数不多的典型高含CO2气体的油气带,研究油气充注与高丰度CO2气体运移、聚集之间的相互关系,对于油气勘探和CO2气藏的发现都具有重要意义。基于原油饱和烃和芳烃等地球化学实验分析结果以及流体包裹体岩石学特征等,系统开展了CO2气体充注与秦皇岛29构造带油气成藏的相互关系及影响,研究并深入探讨了秦皇岛29构造带高含CO2气体的油气藏形成机理。研究认为:①构造带油气主要赋存于沙河街组一段(沙一段)和东营组,油气来源于秦南凹陷沙一段和沙三段烃源岩,以沙一段为主;②构造带油气藏经历了两期油气充注事件,早期以原油充注为主,运移方向以横向为主,石油自北向南沿着砂体运移,由秦南凹陷运移至凸起带,晚期发生了岩浆热流体引起的气体瞬时充注事件,以垂向运移为主,富含烃类的超临界CO2流体先沿着深大断裂向上运移,进入主力油层后,自南向北横向运移;③构造带油气藏气洗作用比较明显,形成了主力油气藏底部富集稠油和沥青、中部为轻质油、上部为凝析油,以及顶部以CO2气体为主要气层的油气分布格局。
中图分类号:
表1
渤海海域秦29/E油气藏原油性质"
井号 | 深度/m | 相对密度/(°API) | 沥青质含量/% | 胶质含量/% | 蜡含量/% | 酸值(KOH)/(mg·g-1) |
---|---|---|---|---|---|---|
QHD29-1 | 2 010.0 | 16.67 | 4.42 | 14.33 | 6.67 | 1.88 |
QHD29-1 | 3 195.0 | 49.22 | 0.26 | 0.29 | 5.72 | 0.10 |
QHD29-1 | 3 301.0 | 33.70 | 1.46 | 7.12 | 22.87 | 0.11 |
QHD29-1 | 3 306.0 | 31.80 | 2.03 | 6.80 | 26.05 | 0.17 |
QHD29E-1 | 3 175.0 | 53.95 | 0 | 0.05 | 3.17 | 0.02 |
QHD29E-1 | 3 199.0 | 36.95 | 0.74 | 4.49 | 19.78 | 0.03 |
QHD29E-1 | 3 296.0 | 33.28 | 1.80 | 5.96 | 20.06 | 0.22 |
QHD29E-1 | 3 328.5 | 32.42 | 3.96 | 5.64 | 20.96 | 0.30 |
QHD29E-1 | 3 331.5 | 30.04 | 5.48 | 5.32 | 22.75 | 0.40 |
QHD29E-2 | 3 390.0 | — | 25.07 | 11.95 | 10.96 | — |
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