鄂尔多斯盆地大牛地下古生界天然气地球化学特征及其来源综合判识

孙晓; 王杰; 陶成; 张毅; 贾会冲; 姜海健; 马亮帮; 王付斌

doi:10.11781/sysydz202102307

鄂尔多斯盆地大牛地下古生界天然气地球化学特征及其来源综合判识

doi: 10.11781/sysydz202102307

孙晓^{1, 2,},
王杰^{3, 4, ,},
陶成^{3, 4},
张毅^{3, 4},
贾会冲²,
姜海健³,
马亮帮^{3, 4},
王付斌²

1.
成都理工大学沉积地质研究院, 成都 610059
2.
中国石化华北油气分公司勘探开发研究院, 郑州 450006
3.
中国石油化工集团有限公司油气成藏重点实验室, 江苏无锡 214126
4.
中国石化石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214126

基金项目:

国家自然科学基金项目 42072154

中国石化科技部项目 P17009-2

中国石化科技部项目 P20043

详细信息

作者简介:
孙晓(1980—), 男, 博士研究生, 副研究员, 从事沉积地质及天然气勘探研究。E-mail: sunxiao.hbsj@sinopec.com

通讯作者:
王杰(1975—), 男, 博士, 高级工程师, 主要从事油气地质及有机地球化学研究。E-mail: wangjie.syky@sinopec.com

中图分类号: TE122.1
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出版历程
- 收稿日期: 2020-09-04
- 修回日期: 2021-01-28
- 刊出日期: 2021-03-28

Evaluation of geochemical characteristics and source of natural gas in Lower Paleozoic, Daniudi area, Ordos Basin

SUN Xiao^{1, 2
,},
WANG Jie^{3, 4
, ,},
TAO Cheng^{3, 4},
ZHANG Yi^{3, 4},
JIA Huichong²,
JIANG Haijian³,
MA Liangbang^{3, 4},
WANG Fubin²

1.
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, Sichuan 610059, China
2.
Research Institute of Exploration and Development, SINOPEC North China Company, Zhengzhou, Henan 450006, China
3.
SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms, Wuxi, Jiangsu 214126, China
4.
Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China

摘要

摘要: 近年来，鄂尔多斯盆地大牛地古生界天然气勘探取得重要进展，尤其是下古生界奥陶系风化壳连续高产工业气流的发现，展示了良好的勘探前景，但大牛地下古生界天然气成因及气源研究相对薄弱，直接制约了下一步勘探部署，为此系统开展了大牛地古生界天然气组分、碳氢同位素、稀有气体组分和同位素等地球化学分析。大牛地古生界天然气中甲烷占绝对优势，含有一定量的重烃，非烃气CO₂和N₂含量相对较高，既有典型的成熟阶段生成的湿气，也有高过成熟阶段生成的干气。大牛地上古生界天然气为典型煤型气，而下古生界天然气既有煤型气，也有油型气。古生界天然气中CO₂主要为有机成因，少数为无机成因，无机成因CO₂赋存于下古生界储层，可能主要由下古生界烃源岩中碳酸盐岩热解产生。综合运用烃源岩岩石脱附气碳同位素—天然气碳同位素—干酪根碳同位素、天然气甲烷氢同位素、稀有气体Ar同位素定年及混源模拟实验等综合地球化学手段，明确了大牛地上、下古生界煤型气均来源于上古生界煤系烃源岩，而下古生界油型气中混有0~45%的煤型气，主要来源于下古生界马家沟组烃源岩。
- 天然气成因 /
- 气源判识 /
- 下古生界 /
- 大牛地 /
- 鄂尔多斯盆地
Abstract: In recent years, great progress has been made in the exploration of natural gas in the Paleozoic in the Daniudi Gas Field in the northern Ordos Basin, especially the discovery of high yield industrial gas flow in the Ordovician weathering crust. However, the study of the origin and source of natural gas in the Lower Paleozoic in the Daniudi area is relatively limited, which directly restricts the next exploration project in the Lower Paleozoic in the northern Ordos Basin. The systematic analyses of gas components and carbon, hydrogen and noble gas isotopes showed that natural gas of the Paleozoic in the Daniudi area is dominated by methane and contains a certain amount of heavy hydrocarbons, and the carbon dioxide and nitrogen content is relatively high. It is not only dry gas generated at high to over maturity, but also wet gas originated from the mature stage. The natural gas of the Upper Paleozoic in the Daniudi area is a typical coal-type gas, while the natural gas of the Lower Paleozoic is both coal-type gas and oil-type gas. The carbon dioxide in the natural gas of the Paleozoic is mainly organic and with a small amount in the Lower Paleozoic being inorganic, which may be produced by the pyrolysis of carbonate minerals in the Lower Paleozoic source rocks. Geochemical analyses such as the carbon isotopes of source rock desorption gas, natural gas and kerogen, the hydrogen isotope of methane, the argon isotope dating, and the end-member gas mixed simulation experiments demonstrated that the coal-type gas in Upper and Lower Paleozoic in the Daniudi area in the northern Ordos Basin originated from the Upper Paleozoic coal-bearing source rocks, while the oil-type gas in the Lower Paleozoic was mixed with 0-45% coal-type gas, and the oil-type gas was predominant in the natural gas, which mainly originated from the source rocks of the Majiagou Formation in the Lower Paleozoic.
- natural gas origin /
- gas source evaluation /
- Lower Paleozoic /
- Daniudi area /
- Ordos Basin

HTML全文

图 1 鄂尔多斯盆地构造区划和气田位置

Figure 1. Structural division and gas field location in Ordos Basin

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图 2 鄂尔多斯盆地大牛地古生界天然气组分特征

Figure 2. Component characteristics of Paleozoic natural gas in Daniudi Gas Field, Ordos Basin

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图 3 鄂尔多斯盆地大牛地古生界天然气乙烷与丙烷碳同位素组成特征

Figure 3. Carbon isotope composition of ethane and propane of Paleozoic natural gas in Daniudi Gas Field, Ordos Basin

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图 4 鄂尔多斯盆地大牛地古生界天然气二氧化碳含量与其碳同位素组成的关系

Figure 4. Relationship between carbon dioxide content and carbon isotope of Paleozoic natural gas in Daniudi Gas Field, Ordos Basin

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图 5 鄂尔多斯盆地大牛地古生界天然气³He/⁴He值与⁴⁰Ar/³⁶Ar值的关系

Figure 5. Relationship between ³He/⁴He and ⁴⁰Ar/³⁶Ar ratios of Paleozoic natural gas in Daniudi Gas Field, Ordos Basin

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图 6 鄂尔多斯盆地大牛地气田古生界天然气烷烃气碳、氢同位素组成特征

Figure 6. Isotopic characteristics of carbon and hydrogen of hydrocarbon gas in Paleozoic natural gas in Daniudi Gas Field, Ordos Basin

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图 7 鄂尔多斯盆地大牛地古生界天然气同位素组成与烃源岩脱附气碳同位素组成特征对比

Figure 7. Carbon isotope composition contrast between Paleozoic natural gas and desorbed gas of source rocks in Daniudi Gas Field, Ordos Basin

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图 8 鄂尔多斯盆地大牛地古生界天然气乙烷碳同位素与潜在烃源岩干酪根碳同位素组成对比

Figure 8. Carbon isotope characteristics comparison between ethane of Paleozoic natural gas and kerogen of possible source rocks in Daniudi Gas Field, Ordos Basin

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鄂尔多斯盆地大牛地下古生界天然气地球化学特征及其来源综合判识

doi: 10.11781/sysydz202102307

作者简介:
孙晓(1980—), 男, 博士研究生, 副研究员, 从事沉积地质及天然气勘探研究。E-mail: sunxiao.hbsj@sinopec.com

通讯作者:
王杰(1975—), 男, 博士, 高级工程师, 主要从事油气地质及有机地球化学研究。E-mail: wangjie.syky@sinopec.com

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Evaluation of geochemical characteristics and source of natural gas in Lower Paleozoic, Daniudi area, Ordos Basin

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留言板

鄂尔多斯盆地大牛地下古生界天然气地球化学特征及其来源综合判识

doi: 10.11781/sysydz202102307

作者简介: 孙晓(1980—), 男, 博士研究生, 副研究员, 从事沉积地质及天然气勘探研究。E-mail: sunxiao.hbsj@sinopec.com

通讯作者: 王杰(1975—), 男, 博士, 高级工程师, 主要从事油气地质及有机地球化学研究。E-mail: wangjie.syky@sinopec.com

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出版历程

Evaluation of geochemical characteristics and source of natural gas in Lower Paleozoic, Daniudi area, Ordos Basin

计量

出版历程

目录

作者简介:
孙晓(1980—), 男, 博士研究生, 副研究员, 从事沉积地质及天然气勘探研究。E-mail: sunxiao.hbsj@sinopec.com

通讯作者:
王杰(1975—), 男, 博士, 高级工程师, 主要从事油气地质及有机地球化学研究。E-mail: wangjie.syky@sinopec.com