石油与天然气地质 ›› 2022, Vol. 43 ›› Issue (2): 432-444.doi: 10.11743/ogg20220215
李天军1,2(), 黄志龙1,2(), 郭小波3, 赵静1,2, 蒋一鸣4, 谭思哲4
收稿日期:
2020-06-18
修回日期:
2022-01-19
出版日期:
2022-04-01
发布日期:
2022-03-11
通讯作者:
黄志龙
E-mail:litianjun2020@163.com;huang5288@163.com
第一作者简介:
李天军(1993—),男,博士,油气成藏地质评价。E?mail: 基金项目:
Tianjun Li1,2(), Zhilong Huang1,2(), Xiaobo Guo3, Jing Zhao1,2, Yiming Jiang4, Sizhe Tan4
Received:
2020-06-18
Revised:
2022-01-19
Online:
2022-04-01
Published:
2022-03-11
Contact:
Zhilong Huang
E-mail:litianjun2020@163.com;huang5288@163.com
摘要:
东海盆地西湖凹陷平北斜坡带平湖组煤系原油性质及分布规律复杂,烃源岩纵、横向沉积环境及生物来源非均质性强,具有斜坡带和西次凹多源供烃特征。将地质与地球化学相结合,进行了原油类型划分与油-源精细对比,梳理了原油分布与生烃次洼的关系。结果表明:平北地区原油以凝析油为主,含少量轻质油和正常原油,根据生物标志化合物特征,可划分为3种类型。Ⅰ类原油主要分布在孔雀亭地区,主要来源于陆源高等植物的裸子植物松柏目树脂,与本地平湖组中段下亚段(平中下亚段)-平湖组下段(平下段)烃源岩具有明显亲缘关系。Ⅱ1类原油主要分布在武云亭地区的平上段及平中上亚段和NB8洼陷,具有陆源裸子植物和蕨类植物双重贡献,且蕨类植物贡献更大,与平上段、平中上亚段烃源岩有明显亲缘关系,并有成熟度较高的低带-西次凹海源有机质的贡献。Ⅱ2类原油主要分布在武云亭及宝云亭—团结亭地区,陆源裸子植物松柏目树脂贡献更大,与平中下亚段和平下段烃源岩具有明显亲缘关系。研究成果对深化平北斜坡带油源的新认识和油气藏预测及勘探部署有较大指导作用。
中图分类号:
表 1
西湖凹陷平北斜坡带平湖组原油成熟度参数统计"
井位 | 顶深/m | 底深/m | αααC29甾烷20S/(20S+20R) | C29甾烷αββ/(αββ+ααα) | Ts/Tm | MPI1 | MPI1计算Ro/% |
---|---|---|---|---|---|---|---|
KQT-F | 2 647.0 | — | 0.45 | 0.51 | 0.36 | 0.62 | 0.77 |
KQT-C | 4 548.7 | 4 566.2 | 0.52 | 0.56 | 0.66 | 0.71 | 0.89 |
KQT-F | 3 099.0 | — | 0.48 | 0.52 | 0.50 | 0.75 | 0.85 |
TJT-A | 3 223.4 | 3 242.0 | 0.54 | 0.54 | 0.35 | 0.82 | 0.89 |
TJT-A | 2 845.4 | 2 850.1 | 0.37 | 0.45 | 0.38 | 0.74 | 0.85 |
WTY-B | 3 640.5 | — | 0.44 | 0.51 | 0.36 | 0.97 | 0.98 |
KQT-C | 4 183.0 | 4 196.0 | 0.51 | 0.58 | 0.66 | 0.97 | 0.99 |
WYT-B | 3 475.0 | — | 0.39 | 0.42 | 0.44 | 0.98 | 0.99 |
WYT-A | 4 580.0 | 4 620.0 | 0.55 | 0.52 | 0.46 | 1.00 | 1.00 |
KQT-B | 4 186.7 | 4 202.5 | 0.56 | 0.61 | 0.64 | 1.01 | 1.00 |
KQT-B | 4 107.5 | 4 125.0 | 0.54 | 0.58 | 0.70 | 1.02 | 1.01 |
WYT-B | 3 743.5 | — | 0.43 | 0.54 | 0.49 | 1.03 | 1.02 |
WYT-B | 3 546.0 | — | 0.43 | 0.50 | 0.36 | 1.03 | 1.02 |
BYT-D | 4 386.5 | 4 459.5 | — | — | — | 1.06 | 1.04 |
WYT-B | 3 532.0 | — | 0.45 | 0.50 | 1.03 | 1.09 | 1.05 |
WYT-B | 3 760.0 | — | 0.45 | 0.49 | 0.78 | 1.09 | 1.06 |
WYT-B | 3 614.0 | — | 0.47 | 0.53 | 0.46 | 1.10 | 1.06 |
KQT-D | 4 317.4 | — | 0.40 | 0.54 | 0.71 | 1.15 | 1.09 |
WYT-A | 4 359.0 | 4 382.0 | 0.52 | 0.52 | 0.36 | 1.15 | 1.09 |
WYT-B | 3 780.0 | — | 0.44 | 0.49 | 0.46 | 1.25 | 1.15 |
KQT-F | 2 861.9 | — | 0.44 | 0.54 | 0.69 | 1.26 | 1.16 |
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