| 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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| 关键词:Northern Qiangtang Depression oil sand extract biomarker oil-source correlation |
| 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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| Geochemical Characteristics and Oil Source Discussion of Xiali Formation Oil Sand Extracts in the Northern Qiangtang Depression |
| 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. |
| LI Dongyu,TANG Youjun,SUN Peng,JI Changjun,MEI Yahao,TANG Siwei,HAN Mengyue,CHEN Yun.2025.Geochemical Characteristics and Oil Source Discussion of Xiali Formation Oil Sand Extracts in the Northern Qiangtang Depression[J].Acta Geoscientica Sinica,46(3):671-682. |
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