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| 川西北地区ST3井泥盆系油气地球化学特征及来源 |
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魏国齐1,2,董才源1,2,谢增业1,2,李剑1,2,国建英1,2,张璐1,2,杨春龙1,2,戴鑫3
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(1.中国石油勘探开发研究院,河北廊坊 065007;2.中国石油天然气集团公司天然气成藏与开发重点实验室, 河北廊坊 065007;3.中国石油西南油气田分公司勘探开发研究院,四川成都 610041)
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| 摘要: |
| 对比ST3井泥盆系油气与相关源岩地球化学特征,结合地质研究,明确泥盆系油气来源。结果表明:ST3井泥盆系观雾山组沥青饱和烃分布呈现双峰特征,Pr/Ph=0.56;三环萜烷分布以C23为主峰,五环三萜烷以C30藿烷为主峰,Ts/Tm=0.82,C31～C35升藿烷系列分布齐全且近于呈正常降序分布,伽马蜡烷丰度高;孕甾烷和升孕甾烷含量丰富,规则甾烷中以C27甾烷占优势;ST3井泥盆系两份天然气都是干气,以烃类为主,甲烷含量高,体积分数分别为94.42％、96.96％,C2H6、C3H8含量低,干燥系数大,非烃气体含量低,H2S含量仅为0.01～0.022 g/cm3;甲乙烷碳同位素均值分别为-31.9‰、-28.5‰,乙烷碳同位素相对较轻,甲乙烷呈正碳同位素分布序列;甲烷氢同位素为-139‰、-138‰;对比综合显示ST3井泥盆系油气主要来源于筇竹寺组泥岩,同时下二叠统泥灰岩是重要补充。 |
| 关键词: 川西北地区 ST3井 泥盆系 地球化学特征 油气来源 |
| DOI：10.3969/j.issn.1673-5005.2019.04.004 |
| 分类号::T122.1 |
| 文献标识码:A |
| 基金项目:国家科技重大专项(2016ZX05007-002) |
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| Oil and gas geochemical characteristics and source of Devonian of well ST3 in Northewest Sichuan Basin |
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WEI Guoqi1,2, DONG Caiyuan1,2, XIE Zengye1,2, LI Jian1,2, GUO Jianying1,2, ZHANG Lu1,2, YANG Chunlong1,2, DAI Xin3
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(1.Research Institute of Petroleum Exploration and Development, PetroChina, Langfang 065007, China;2.Key Laboratory of Gas Reservoir Formation and Development, CNPC, Langfang 065007, China;3.Research Institute of Petroleum Exploration and Development of Southwest Oil and Gas Field Company, PetroChina, Chengdu 610041, China)
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| Abstract: |
| Based on analysis of geochemical characteristics of the Devonian asphalt and natural gas in well ST3, characteristics of the oil and gas of the Devonian were compared with relative source rocks. Combined with geological evidence, the source of the Devonian oil and gas in well ST3 were identified. The following are the results:Saturated hydrocarbon distribution of Devonian asphalt in well ST3 has double peaks and the Pr/Ph ratio is 0.56. C23 is the main peak of the tricyclic terpane distribution, and C30 hopanoid is the main peak of the pentacyclic triterpane. The Ts/Tm content is 0.82. The C31～C35 hopane series is complete and the distribution declines. Gammacerane is high in abundance. Pregnane is rich in abundance. C27 regular sterane takes advantage in regular sterane content. The Devonian natural gas of well ST3 is dry gas, mainly composed of hydrocarbons. The content of methane is 94.42％ and 96.96％, while the content of C2H6 and C3H8 is small. The drying coefficient is high. The non-hydrocarbon gas content is very low, in which the H2S content is only 0.01～0.022 g/cm3. The average carbon isotope of CH4 and C2H6 is -31.9‰ and -28.5‰ respectively. The hydrogen isotope of methane is -139 ‰ and -138‰. The comparisons show that the Devonian oil and gas in well ST3 were mainly derived from the mudstone of the Qiongzhusi Formation, while the Lower Permian marble is an important supplement. |
| Key words: Northwest Sichuan Basin well ST3 Devonian geochemical characteristics oil and gas source |
