| 羌塘盆地普若岗日地区索瓦组烃源岩特征 |
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| 引用本文：于珺,胡春桥,张洪美,黄峰,李娜,秦子建,李鑫龙.2025.羌塘盆地普若岗日地区索瓦组烃源岩特征[J].地球学报,46(3):615-622. |
| DOI：10.3975/cagsb.2024.111512 |
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| 基金项目:陕西延长石油(集团)有限责任公司“羌塘盆地油气资源评价”项目(编号: YJKTS23SFW0003) |
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| 中文摘要:羌塘盆地油气勘探程度整体较低。为了进一步明确侏罗纪索瓦组烃源岩潜力, 本次研究针对普若岗日剖面露头开展总有机碳、抽提、色谱-质谱、镜质体反射率Ro测定和同位素等分析测试, 明确普若岗日地区索瓦组烃源岩特征及形成环境。研究区索瓦组烃源岩总有机碳含量介于0.22%~2.16%之间, 均值为0.65%。其沉积环境为还原性海相, 母质来源为高等植物和藻类双重贡献。干酪根同位素显示有机质类型为III型。受古近纪火山活动影响, 烃源岩成熟度较高, 处于过成熟阶段, Ro介于1.85%~3.51%之间。综合分析表明, 以侵入岩(曾经的热源)为中心, 至普若岗日剖面的辐射范围内的索瓦组烃源岩以生气为主。在远离侵入岩的区域, 索瓦组烃源岩可生成少量的原油。 |
| 中文关键词:羌塘盆地 海相 烃源岩 成熟度 火山活动 |
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| Source Rock Characteristics of Suowa Formation in Puruogangri Area, Qiangtang Basin |
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| Abstract:The degree of oil and gas exploration in the Qiangtang Basin is low. To identify the potential of Juras-sic Suowa Formation source rocks, the current study conducted total organic carbon extraction, chromatography-mass spectrometry, Ro determination, and isotopic analysis of the Puruogangri profile outcrop. This study aimed to define the source rock characteristics and formation environment of the Suowa Formation in Puruogangri area. The results showed that the total organic carbon content of the Suowa Formation source rocks in the study area ranges from 0.22% to 2.16%, with an average of 0.65%. The depositional environment is a reductive marine facies, with the parent material contributed by higher plants and algae. The kerogen isotopes indicated type III organic matter. Influenced by Paleogene volcanic activity, the source rocks were at a high-maturity stage, with Ro values ranging from 1.85% to 3.51%. A comprehensive analysis indicated that the Suowa Formation source rocks, centered around intrusive rocks (former heat sources) and within the radiation range of the Puruogangri profile, are gas-dominated. In areas distant from the intrusive rocks, the Suowa Formation source rocks could produce small amounts of crude oil. |
| keywords:Qiangtang Basin marine source rock maturity volcanic activity |
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