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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

高建民. 沉积盆地深凹部位非常规圈闭油气藏的探讨[J]. 石油实验地质, 1991, 13(1): 33-40. doi: 10.11781/sysydz199101033
引用本文: 李芙蓉, 刘文汇, 王晓锋, 张东东, 罗厚勇, 陈晓艳, 李福奇, 张雯. 鄂尔多斯盆地古生界天然气地球化学特征与成因[J]. 石油实验地质, 2023, 45(4): 809-820. doi: 10.11781/sysydz202304809
Gao Jianmin. PROBE INTO A KIND OF HYDROCARBON POOLS UNCONVENTIONALLY TRAPPED IN DEEP DEPRESSION OF SEDIMENTARY BASIN[J]. PETROLEUM GEOLOGY & EXPERIMENT, 1991, 13(1): 33-40. doi: 10.11781/sysydz199101033
Citation: LI Furong, LIU Wenhui, WANG Xiaofeng, ZHANG Dongdong, LUO Houyong, CHEN Xiaoyan, LI Fuqi, ZHANG Wen. Geochemical characteristics and genesis of Paleozoic natural gas in the Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(4): 809-820. 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
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

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

  • 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。

     

  • 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.
  • 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

    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

    图  3  鄂尔多斯盆地古生界天然气δ13C1δ13C2关系

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

    图  4  鄂尔多斯盆地上、下古生界天然气δ13C1δD1δ13C2δD1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

    图  5  鄂尔多斯盆地上古生界各产区天然气δ13C1δ13C2关系

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

    图  6  鄂尔多斯盆地南部上古生界天然气δ13C1δ13C2δ13C3序列分布

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

    图  7  鄂尔多斯盆地下古生界上—中—下组合天然气δ13C2δD1关系

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

    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

    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

    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

    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

    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

    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
    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/C1-5 (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)。
    下载: 导出CSV

    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/%
    <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)。
    下载: 导出CSV
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  • 收稿日期:  2023-02-17
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