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柴达木盆地西部地区咸化湖盆天然气地球化学特征及成因类型判识指标——以古近系-新近系为例

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文章导航 > 地质通报 > 2016 > 35(2-3): 321-328

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刘军, 刘成林, 孙平, 张林, 李浩涵, 张艳芳, 康艳丽, 席勤. 柴达木盆地西部地区咸化湖盆天然气地球化学特征及成因类型判识指标——以古近系-新近系为例[J]. 地质通报, 2016, 35(2-3): 321-328.
引用本文: 刘军, 刘成林, 孙平, 张林, 李浩涵, 张艳芳, 康艳丽, 席勤. 柴达木盆地西部地区咸化湖盆天然气地球化学特征及成因类型判识指标——以古近系-新近系为例[J]. 地质通报, 2016, 35(2-3): 321-328.
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LIU Jun, LIU Chenglin, SUN Ping, ZHANG Lin, LI Haohan, ZHANG Yanfang, KANG Yanli, XI Qin. Geochemical characteristics of natural gas in saline basin of western Qaidam Basin:A case study of Paleogene-Neogen strata[J]. Geological Bulletin of China, 2016, 35(2-3): 321-328.
Citation: LIU Jun, LIU Chenglin, SUN Ping, ZHANG Lin, LI Haohan, ZHANG Yanfang, KANG Yanli, XI Qin. Geochemical characteristics of natural gas in saline basin of western Qaidam Basin:A case study of Paleogene-Neogen strata[J]. Geological Bulletin of China, 2016, 35(2-3): 321-328.
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柴达木盆地西部地区咸化湖盆天然气地球化学特征及成因类型判识指标——以古近系-新近系为例

  • 1. 中国石油青海油田公司勘探事业部, 甘肃 敦煌 736202;
    2. 中国地质科学院地质力学研究所, 北京 100081;
    3. 中国石油勘探开发研究院廊坊分院, 河北 廊坊 065007;
    4. 中国地质调查局油气资源调查中心, 北京 100029;
    5. 中国石油塔里木油田公司勘探开发研究院, 新疆 库尔勒 841000

Geochemical characteristics of natural gas in saline basin of western Qaidam Basin:A case study of Paleogene-Neogen strata

  • 1. Exploration Enterprise Department, PetroChina Qinghai Oilfield Company, Dunhuang 736202, Gansu, China;
    2. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;
    3. PetroChina Research Institute of Petroleum Exploration and Development-Langfang, Langfang 065007, Hebei, China;
    4. Oil and Gas Resources Research Center, China Geological Survey, Beijing 100029, China;
    5. Research Institute of Exploration and Development, PetroChina Tarim Oilfield Company, Korla 841000, Xinjiang, China

    摘要
  • 根据天然气地球化学基本理论,对柴达木盆地西部(柴西)地区天然气的地球化学特征进行分析。测试和收集该地区18个油气田及含油气构造的83个天然气样品,分析其组分和C同位素数据,结果显示,该区天然气以烃类气体为主,烃类含量介于79.24%~99.81%之间,天然气比重介于0.72~1.36之间,天然气干燥系数(C1/C2+)介于1.04~617.8之间,甲烷C同位素值介于-51.4‰~-24.2‰之间,乙烷C同位素值介于-34.2‰~-17.4‰之间。在此基础上,对该区不同构造带的天然气成因类型进行研究。研究结果表明,柴达木盆地西部地区天然气类型可划分为腐泥型气、腐殖型气、混合气3类,柴西北部天然气主要为腐泥型气和混合气,少量腐殖型气;柴西南部主要为腐泥型气,少量混合气。同时,建立了天然气成因类型的判识指标,对该区的天然气地球化学特征有了较为深入的认识,对今后的天然气勘探具有指导意义。
    In this paper, the authors investigated the geochemical characteristics of natural gas in Western Qaidam Basin with the ba-sic theory of natural gas geochemistry, analyzed components and carbon isotopes data based on testing and collected 83 natural gas samples from 18 oil and gas fields and oil-bearing structures. The result shows that natural gas is main made up of hydrocarbon, with the hydrocarbon content between 79.24% and 99.81%, the natural gas proportion is 0.72~1.36, the dryness coefficient(C1/C2+) is 1.04~617.8, the methane carbon isotope value is -51.4‰~-24.2‰ and the ethane carbon isotope value is -34.2‰~-17.4‰. On such a basis, the authors studied the natural gas genetic types of different structural belts and established the identification indices of natural gas genetic types in this area. The research demonstrates that the genetic types of natural gas can be divided into three kinds in Western Qaidam Basin, namely sapropel-type gas, humic-type gas and mixed gas, that the northwestern Qaidam Basin has mainly sapropel-type gas, mixed gas and a small amount of humic-type gas, and that the southwestern Qaidam Basin mainly has sapropeltype gas and a small amount of mixed gas.
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出版历程
收稿日期:  2014-12-09
修回日期:  2015-07-01
刊出日期:  2016-03-15

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