| 渤海湾盆地渤中19-6气田凝析油特征及油气关系 |
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| 引用本文： | 李威,李友川,兰蕾,傅宁,王柯.渤海湾盆地渤中19-6气田凝析油特征及油气关系[J].地质学报,2021,95(3):913-923. |
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| 作者姓名： | 李威 李友川 兰蕾 傅宁 王柯 |
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| 作者单位： | 中海油研究总院有限责任公司,北京,100028 |
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| 基金项目： | 本文为中国海洋石油集团有限公司青年科技与管理创新研究课题（编号 JZTW2019KJ02）资助成果。 |
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| 摘 要： | 2018年中国东部最大整装凝析气田——渤中19-6气田的发现,一举打开了渤海湾盆地深层天然气勘探的新领域,展现了油型盆地天然气勘探的巨大潜力。渤中凹陷发育多套不同成熟度的烃源岩,位于渤中凹陷西南部的渤中19-6气田凝析油与天然气并存,近年来于该地区的天然气成因及形成条件多有研究,但是对于凝析油的形成则少有研究。本文以渤中19-6气田为例,探讨多套烃源岩发育的复杂油气区凝析油的成因及与天然气的关系。渤中19-6气田6个凝析油样品化学组成及其变化特征精细分析对比表明:该区凝析油以低碳数正构烷烃为主,含有较丰富的环己烷、甲基环己烷等环烷烃和苯、甲苯等低碳数芳烃,金刚烷类化合物较发育,高碳数生物标志化合物含量较低,综合判断凝析油属于混合偏腐殖型高熟原油。结合该区凝析油与天然气对比结果认为,该区凝析油和天然气属于同一套烃源岩在同一阶段所生成的烃类化合物,两者相伴而生,均属于烃源岩原生产物。
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| 关 键 词： | 渤中凹陷 天然气 凝析油 轻烃 气油对比 |
| 收稿时间： | 2019/9/11 0:00:00 |
| 修稿时间： | 2019/12/30 0:00:00 |
Genetic type of condensates oil and oil- gas relationship in the Bozhong 19- 6 gas field, Bohai Bay basin |
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| LI Wei,LI Youchuan,LAN Lei,FU Ning,WANG Ke.Genetic type of condensates oil and oil- gas relationship in the Bozhong 19- 6 gas field, Bohai Bay basin[J].Acta Geologica Sinica,2021,95(3):913-923. |
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| Authors: | LI Wei LI Youchuan LAN Lei FU Ning WANG Ke |
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| Institution: | (CNOOC Research Institute Co.Ltd.,Beijing,100028) |
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| Abstract: | The discovery of Bozhong 19- 6 gas field, the largest integrated condensate gas field in eastern China in 2018, has opened up a new field of deep gas exploration in the Bohai Bay basin, showing great potential for gas exploration in oil- type basins with multiple sets of source rocks with different maturity and various chemical features. Condensate and natural gas co- exist in Bozhong 19- 6 gas field located in the southwest of Bozhong Sag. The formation mechanism of condensate gas has been seriously debated for long time; however, no study has integrated it with genetic types of condensate oil. Taking the Bozhong 19- 6 condensate gas as an example, this study employs geological and geochemical methods to determine the formation mechanism of condensates oil and condensates gas in a complicated petroliferous area, and reveals the causes of the co- occurrence of condensates gas and oil in this region. Based on detailed geochemical analyses of 6 condensates oils, it is found that the condensates are dominated by low carbon number n- alkanes and enriched in light naphthenics and aromatic hydrocarbons. Adamantanes are present in abundance, with low abundance of high carbon biomarkers. It is concluded that condensate oils belong to mixed high mature crude oil. Combined with the comparison results of condensate oils and natural gas in this area, it is concluded that the condensate oils and natural gas belong to the same set of hydrocarbon compounds generated by the same source rock at the same stage, and they are both the products of the source rock. |
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| Keywords: | Bozhong depression natural gas condensate oil light hydrocarbon oil- gas correlation |
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