| 北羌塘坳陷夏里组油砂地球化学特征及油源探讨 |
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| 引用本文：黎东玉,唐友军,孙鹏,季长军,梅亚豪,汤思维,韩梦月,陈云.2025.北羌塘坳陷夏里组油砂地球化学特征及油源探讨[J].地球学报,46(3):671-682. |
| DOI：10.3975/cagsb.2024.120601 |
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| 基金项目:西藏自治区科技计划项目(编号: XZ202401YD0006)和中国地质调查局项目“羌塘盆地战略性矿产调查评价”(编号: DD20230315) |
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| 中文摘要:针对北羌塘坳陷研究区勘探程度较低、油气性质复杂及油源不明等问题, 本次研究对北羌塘坳陷南部西长梁地区、胜利河地区及方湖地区夏里组油砂进行了分析, 采用了空间分布、族组成、气相色谱及色谱-质谱等多种分析方法, 以明确油气成因与来源。结果表明, 夏里组油砂的分布呈东西走向, 其生物降解程度依次为: 西长梁地区>胜利河地区>方湖地区。同时, 夏里组油砂油均已达到成熟阶段, 主要源自偏还原的海相沉积环境, 生油母质则主要来自低等水生生物与陆地高等植物的双重贡献, 其中方湖地区的陆生植物贡献尤为突出。通过对比分析北羌塘坳陷内夏里组、布曲组、索瓦组及巴贡组四套烃源岩与夏里组油砂的有机地球化学特征, 推断出西长梁和胜利河地区的夏里组油砂主要源自夏里组烃源岩, 而方湖地区的夏里组油砂则主要源自巴贡组烃源岩。这一发现不仅拓展了北羌塘坳陷油气勘探的潜在层系, 同时亦为北羌塘中生界的油气勘探提供了重要的指导意义。 |
| 中文关键词:北羌塘坳陷 油砂 生物标志化合物 油源对比 |
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| Geochemical Characteristics and Oil Source Discussion of Xiali Formation Oil Sand Extracts in the Northern Qiangtang Depression |
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| Abstract:Owing to the problems of low exploration degree, complex oil and gas properties, and unknown oil sources in the Northern Qiangtang Depression, the present study analyzed the oil sands of the Xichangliang, Shenglihe, and Fanghu areas in the south of the Northern Qiangtang Depression. Various analytical methods, such as spatial distribution, family composition, gas chromatography, and chromatography-mass spectrometry were used to identify the origin and source of oil and gas. The results showed that the distribution of the Xiali Formation oil sand extracts is east-west, and its biodegradation degree is in the following order: Xichangliang area > Shenglihe area > Fanghu area. Notably, the oil of the Xiali Formation has reached the mature stage and is primarily derived from the marine sedimentary environment of partial reduction and from the double contribution of lower aquatic organisms and higher terrestrial plants, especially those in the Fanghu area. By comparing the organic geochemical characteristics of the four sets of source rocks of the Xiali, Buqu, Sowa, and Bagong Formations and the oil sand extracts of the Xiali Formation in the Northern Qiangtang Depression, it was concluded that the oil sand extracts of the Xiali Formation in the Xichangliang and Shenglihe areas were primarily derived from the source rocks of the Xiali Formation. In contrast, the oil sand extracts of the Xiali Formation in the Fanghu area are primarily derived from the source rocks of the Bagong Formation. This discovery expands the potential strata of oil and gas exploration in the Northern Qiangtang Depression and provides important guidelines for the Mesozoic oil and gas exploration in the Northern Qiangtang Depression. |
| keywords:Northern Qiangtang Depression oil sand extract biomarker oil-source correlation |
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