鄂尔多斯盆地古生界天然气地球化学特征与成因

李芙蓉; 刘文汇; 王晓锋; 张东东; 罗厚勇; 陈晓艳; 李福奇; 张雯

doi:10.11781/sysydz202304809

鄂尔多斯盆地古生界天然气地球化学特征与成因

doi: 10.11781/sysydz202304809

李芙蓉^1,,
刘文汇^{1, 2, ,},
王晓锋¹,
张东东¹,
罗厚勇¹,
陈晓艳¹,
李福奇¹,
张雯¹

1.
西北大学地质学系，大陆动力学国家重点实验室，西安 710069
2.
中国石化石油勘探开发研究院，北京 100083

基金项目:

国家自然科学基金 41930426

中国石油长庆油田分公司重大科技专项 ZDZX2021-03

详细信息

作者简介:
李芙蓉(1997—)，女，硕士研究生，从事油气地球化学研究。E-mail: 202021393@stumail.nwu.edu.cn

通讯作者:
刘文汇(1957—)，男，教授，本刊编委，从事天然气地质及油气地球化学研究。E-mail: whliu@nwu.edu.cn

中图分类号: TE122.33
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- 被引次数: 0
出版历程
- 收稿日期: 2023-02-17
- 修回日期: 2023-07-03
- 刊出日期: 2023-07-28

Geochemical characteristics and genesis of Paleozoic natural gas in the Ordos Basin

1.
State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an, Shaanxi 710069, China
2.
SINOPEC Petroleum Exploration and Production Research Institute, Beijing 100083, China

摘要

摘要: 鄂尔多斯盆地古生界天然气地球化学特征与成因复杂，下古生界气源存在争议。为更好地把握盆地古生界天然气的整体地球化学特征和变化规律，在系统收集、整理和解析前人资料基础上，对全盆地700余个天然气样品的地球化学资料进行了综合分析，并结合对天然气成源、成烃和成藏等关键要素的分析，探讨了天然气的成因。结果表明，鄂尔多斯盆地上古生界天然气主体为受成熟度控制的煤型气，由东北向西南方向成熟度升高，盆地南部上古生界地层存在上、下古生界天然气的混合。下古生界天然气以海相碳酸盐岩层系油型气为主，其中上组合具有上古生界煤型气—下古生界油型气两源复合成藏特征，中—下组合天然气是相对独立的油型气藏，以地质条件和有机质热演化程度为基础受不同程度的次生改造作用，造成了其碳同位素组成的显著异常。研究证明了盆地下古生界存在包括碳酸盐岩在内的海相烃源的规模贡献，在盆地的不同位置，上、下古生界天然气存在不同程度的混合。
- 热化学硫酸盐还原作用 /
- 地球化学特征 /
- 海相烃源岩 /
- 天然气 /
- 古生界 /
- 鄂尔多斯盆地
Abstract: The geochemical characteristics and genesis of Paleozoic natural gas in the Ordos Basin are complex, with some disputes on the gas source of Lower Paleozoic. In order to better grasp the overall geochemical characteristics and variation laws of Paleozoic natural gas in the basin, the geochemical data of more than 700 natural gas samples from the whole basin are comprehensively analyzed based on the systematic collection, collation and analysis of previous data, and the genesis of natural gas is explored by combining the analysis of key elements such as natural gas formation, hydrocarbon formation and reservoir formation. The results show that the main body of Upper Paleozoic natural gas is coal-based gas controlled by maturity, with maturity increasing from northeast to southwest, and the southern part of the basin has a mixture of Upper and Lower Paleozoic gas. The Lower Paleozoic gas is dominated by oil-type gas from marine carbonate formations, of which the upper combination is characterized by a two-source composite reservoir of Upper Paleozoic coal-type gas and Lower Paleozoic oil-type gas; the middle-lower combination is a relatively independent oil-type gas reservoir, subject to different degrees of secondary transformation based on geological conditions and the degree of thermal evolution of organic matter, resulting in significant anomalies in its carbon isotope composition. The research has proved that marine hydrocarbon sources including carbonate rocks exist in the Lower Paleozoic of the basin, and the natural gas in the Upper and Lower Paleozoic has mixed to varying degrees in different locations of the basin.
- thermochemical sulfate reduction /
- geochemical characteristics /
- marine hydrocarbon sources /
- natural gas /
- Paleozoic /
- Ordos Basin
注释:

利益冲突声明/Conflict of Interests

所有作者声明不存在利益冲突。

All authors disclose no relevant conflict of interests.

作者贡献/Authors’ Contributions

李芙蓉、刘文汇、罗厚勇参与论文研究思路设计和写作；王晓锋、李芙蓉、李福奇参与了实验测试；李芙蓉、张东东、陈晓艳、张雯参与了论文修改。所有作者均阅读并同意最终稿件的提交。

The study was designed and the manuscript was drafted by LI Furong, LIU Wenhui and LUO Houyong. The experimental operation was completed by WANG Xiaofeng, LI Furong and LI Fuqi. The manuscript was revised by LI Furong, ZHANG Dongdong, CHEN Xiaoyan and ZHANG Wen. All the authors have read the last version of paper and consented for submission.

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 鄂尔多斯盆地古生界天然气甲烷—乙烷组分含量

Figure 2. Methane-ethane component of Paleozoic natural gas in the Ordos Basin

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图 3 鄂尔多斯盆地古生界天然气δ¹³C₁－δ¹³C₂关系

Figure 3. δ¹³C₁-δ¹³C₂ relationship of Paleozoic natural gas in the Ordos Basin

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图 4 鄂尔多斯盆地上、下古生界天然气δ¹³C₁—δD₁和δ¹³C₂—δD₁关系

底图源自WANG等^[43]。

Figure 4. δ¹³C₁-δD₁ and δ¹³C₂-δD₁ relationships of Upper and Lower Paleozoic natural gas in the Ordos Basin

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图 5 鄂尔多斯盆地上古生界各产区天然气δ¹³C₁—δ¹³C₂关系

Figure 5. δ¹³C₁-δ¹³C₂ relationship of Upper Paleozoic natural gas in different areas of the Ordos Basin

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图 6 鄂尔多斯盆地南部上古生界天然气δ¹³C₁—δ¹³C₂—δ¹³C₃序列分布

Figure 6. δ¹³C₁-δ¹³C₂-δ¹³C₃ sequence of Upper Paleozoic natural gas in the southern Ordos Basin

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图 7 鄂尔多斯盆地下古生界上—中—下组合天然气δ¹³C₂—δD₁关系

Figure 7. δ¹³C₂-δD₁ relationship of Lower Paleozoic natural gas from the top-middle-lower combinations in the Ordos Basin

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图 8 鄂尔多斯盆地古生界天然气埋深—烷烃碳同位素组成关系

Figure 8. Relationship between depth and carbon isotope composition of alkanes from Upper and Lower Paleozoic natural gas in the Ordos Basin

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图 9 鄂尔多斯盆地天然气运移路径上的烷烃碳同位素变化

Figure 9. Changes in carbon isotope composition of alkanes of natural gas in the Ordos Basin

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图 10 鄂尔多斯盆地中—下组合地层生烃证据与TSR作用相关产物

a1.大深1井，马三段岩心取样；a2.固体沥青(×20，单偏光)；b1.鄂8井岩心取样；b2.扫描电镜下的黄铁矿；c1.靖探1井马五_6-7段岩心取样；c2.裂缝中含硫磺。

Figure 10. Evidence of hydrocarbon generation in the middle-lower combination strata and TSR correlation products in the Ordos Basin

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图 11 鄂尔多斯盆地古生界天然气乙烷含量与乙烷碳同位素的关系

Figure 11. Ethane content-δ¹³C₂ relationship of Paleozoic natural gas in the Ordos Basin

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图 12 TSR反应对鄂尔多斯盆地下古生界天然气碳同位素变化的影响模式

图中①为大分子有机质反应阶段；②为气态重烃反应阶段；③为甲烷反应阶段。

Figure 12. Effect of TSR reaction on the changes of carbon isotope composition of Lower Paleozoic natural gas in the Ordos Basin

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表 1 鄂尔多斯盆地古生界天然气组分与同位素组成

Table 1. Paleozoic natural gas composition and isotopic composition in the Ordos Basin

项目		上古生界	下古生界
项目		上古生界	上组合	中—下组合
天然气组分	C₁/%	(72.72~94.49)/91.40(255)	(51.66~98.29)/93.95(966)	(7.10~99.23)/81.64(37)
	C₂/%	(0.53~10.57)/4.24(255)	(0.15~1.56)/0.66(65)	(0.01~7.94)/1.32(36)
	C₃/%	(0.07~3.08)/0.88(255)	(0.01~0.29)/0.10(64)	(1.79~9.56)/4.97(35)
	CO₂/%	(0.02~47.88)/1.12(206)	(0.02~47.8)/3.29(65)	(0.05~33.72)/4.42(28)
	N₂/%	(0.03~16.94)/1.77(205)	(0.02~12.01)/1.88(62)	(0.02~91.94)/11.70(21.8)
	H₂S/%		(0.01~3.57)/1.21(4)	(9.01~23.50)/13.90(5)
	C₁/C_1-5	(0.83~0.99)/0.94(255)	(0.98~0.99)/0.99(65)	(0.81~0.99)/0.97(36)
同位素组成	δ¹³C₁/‰	(-40.9~-26.0)/-32.8(402)	(-39.0~-30.5)/-33.6(114)	(-45.9~-29.4)/-35.9(102)
	δ¹³C₂/‰	(-36.7~-20.6)/-25.2(402)	(-37.8~-22.6)/-30.2(96)	(-39.4~-19.1)/-29.9(80)
	δ¹³C₃/‰	(-36.5~-18.1)/-24.7(380)	(-33.3~-19.8)/-26.4(93)	(-34.1~-19.7)/-21.3(72)
	δD₁/‰	(-210~-167)/-188(148)	(-193~-156)/-171(40)	(-191~-144)/-169(50)
	δD₂/‰	(-181~-121)/-166(125)	(-182~-178)/-180(2)	(-140~-116)/-126(4)
	δD₃/‰	(-218~-141)/-162(10)	(-287~-181)/-234(2)	(-152~-142)/-147(2)
注：表中数据意义为(最小值~最大值)/平均值(样品数)。

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表 2 鄂尔多斯盆地各气田上古生界天然气二氧化碳含量

Table 2. CO₂ content of Upper Paleozoic natural gas in different gas fields of the Ordos Basin

区块	CO₂含量/%
区块	＜1	1~2	2~3	3~4	＞4
伊盟隆起	0.50(2)
靖边气田	0.55(17)	1.27(3)	2.69(1)
苏里格气田	0.62(22)	1.33(30)	2.35(9)
乌审旗气田	0.54(7)
天环坳陷	0.17(2)	1.91(1)		3.82(1)	5.62(1)
富县地区					6.80(3)
东部地区	0.60(23)	1.43(37)	2.58(4)
注：表中数据的意义为：平均值(样本数)。

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