天然气地球科学 ›› 2020, Vol. 31 ›› Issue (1): 26–36.doi: 10.11764/j.issn.1672-1926.2019.08.009

• 天然气地质学 • 上一篇    下一篇

鄂尔多斯盆地临兴地区上古生界天然气成因及来源

胡维强(),李洋冰,陈鑫,马立涛,刘成,黄英,乔方,王朵,刘再振   

  1. 中海油能源发展股份有限公司工程技术分公司,天津 300452
  • 收稿日期:2019-07-22 修回日期:2019-08-29 出版日期:2020-01-10 发布日期:2020-01-09
  • 作者简介:胡维强(1988-),男,湖北咸宁人,工程师,硕士,主要从事油气成藏地质学及相关实验研究.E-mail:huweiqiangh@163.com.
  • 基金资助:
    国家自然科学基金项目(41502132);中国海洋石油总公司科研项目(CNOOC-KJPTGCJS2016-01)

Origin and source of natural gas in the Upper Paleozoic in Linxing area, Ordos Basin

Wei-qiang HU(),Yang-bing LI,Xin CHEN,Li-tao MA,Cheng LIU,Ying HUANG,Fang QIAO,Duo WANG,Zai-zhen LIU   

  1. CNOOC EnerTech?Drilling & Production Co. , Tianjin 300452, China
  • Received:2019-07-22 Revised:2019-08-29 Online:2020-01-10 Published:2020-01-09
  • Supported by:
    the National Natural Science Foundation of China(41502132);The Research Project of China National Offshore Oil Corporation(CNOOC-KJPTGCJS2016-01)

摘要:

天然气成因及来源研究对天然气勘探开发具有重要作用,可以为天然气的运移成藏提供理论依据。通过对鄂尔多斯盆地临兴地区上古生界天然气组分、碳同位素、轻烃及烃源岩等特征进行综合分析研究,探讨该区上古生界天然气成因及来源。结果表明:临兴地区上古生界天然气组分含量以甲烷为主,重烃和非烃含量较低,主要属于干气;天然气δ13C1值、δ13C2值和δ13C3值分别介于-45.6‰~-32.9‰、-28.9‰~-22.3‰和-26.2‰~-19.1‰之间,总体表现出正碳序列变化趋势,并且δ13C1值均小于-30‰,具有典型的有机成因气特征。轻烃组成特征上具有一定的相似性,C7系列表现出甲基环己烷优势;C5?7系列主要表现出异构烷烃优势。该区上古生界天然气主要属于成熟煤成气,含有少量煤成气与油型气的混合气;石盒子组天然气藏主要是由山西组烃源岩生烃增压扩散运移至近源或远源储层内充注成藏;太原组天然气藏主要来自于太原组自身的烃源岩,在源岩内自生自储成藏。

关键词: 天然气, 组分, 碳同位素, 轻烃, 地球化学

Abstract:

Study of the origin and source of natural gas plays an important role in exploration and development, which can provide a theoretical basis for natural gas migration and accumulation. Based on the comprehensive analysis of the characteristics of the natural gas composition, carbon isotope, light hydrocarbons and source rocks in the Upper Paleozoic in Linxing area of Ordos Basin, the origin and source of Upper Paleozoic natural gas in this area are discussed. The study shows that methane is the main component of natural gas, with low contents of heavy hydrocarbons and non-hydrocarbons, mainly belonging to dry gas in the Upper Paleozoic in Linxing area. The values of δ13C1, δ13C2 and δ13C3 of natural gas are in the ranges from -45.6‰ to -32.9‰, -28.9‰ to -22.3‰ and -26.2‰ to -19.1‰, respectively. The carbon isotopic values of alkane gas show a general trend of positive carbon sequence. δ13C1 value is less than -30‰, with typical characteristics of organic origin. There is a certain similarity in the composition characteristics of light hydrocarbons. The C7 series shows an advantage of methyl hexane, while the C5-7 series mainly shows an advantage of isoalkane. The Upper Paleozoic natural gas in this area is mainly composed of mature coal-derived gas, containing a small amount of coal-derived gas and oil-type gas mixture; the natural gas reservoirs of Shihezi Formation are mainly transported by pressurized diffusion of hydrocarbon generation from Shanxi Formation source rock hydrocarbons to filling and accumulation in near-source reservoir or far-source reservoir. The natural gas reservoirs of Taiyuan Formation mainly come from the source rocks of Taiyuan Formation itself, and are generated and stored in the source rocks, in which it is self-generation and self-preservation.

Key words: Natural gas, Composition, Carbon isotope, Light hydrocarbon, Geochemistry

中图分类号: 

  • TE122.2

图1

研究区沉积构造综合示意"

表1

鄂尔多斯盆地临兴地区上古生界天然气组分和碳同位素"

井号层位组分含量/%

干燥

系数

δ13C/‰(VPDB)RO/%
CH4C2H6C3H8iC4H10nC4H10CO2N2C1C2C3
X-1P2sq99.320.210.000.000.000.400.000.998////
X-2P2sh93.060.980.210.040.050.045.540.986-37.7-25.5-23.50.58
X-3P2sh97.961.560.280.050.0500.110.981-36-26.1-23.50.77
X-4P2sh96.821.350.360.060.070.021.20.981-37.3-27.2-24.80.62
X-5P2sh97.141.170.20.040.030.031.320.985-37.5-27.1-24.00.6
X-6P2sh99.110.150000.5700.990///1.95
X-7P2sh91.164.691.330.190.260.021.940.934-34.8-27.5-25.30.94
X-8P2sh93.932.730.760.130.190.041.760.961-36.4-26.6-24.70.72
X-9P2sh93.821.150.320.060.090.013.780.983-36.5-28.9-26.00.71
X-10P2sh98.920.840.13000.1100.990-32.9-23.9-21.61.28
X-11P2sh981.440.280.050.050.060.110.982-37.2-26.1-24.10.63
X-12P2sh94.563.60.90.140.150.080.490.952-34.6-25.9-24.50.97
X-13P1s90.745.21.680.230.320.051.450.924-33.2-28.1-26.21.21
X-14P1t96.040.750.080.020.022.10.970.991-39.8-24.1-20.30.41
X-15P1t92.686.310.280.130.120.150.450.931-41.3-22.3/0.32
X-16P1t93.330.120000.026.470.990-40.4-26.5-19.10.38
X-17P1t96.531.140.170.030.031.80.250.986-41.1-24.8-22.80.33
X-18P1t95.931.480.230.040.041.580.620.982-39.6-24.6-22.70.43
X-19P1t95.920.270002.21.60.990-40.3//0.38
X-20P1t93.370.170.000.0005.500.960.990-46.5///

表2

鄂尔多斯盆地临兴地区上古生界天然气轻烃参数"

井号层位nC7/%MCH/%∑DMCP/%C5-7正构烷烃/%C5-7异构烷烃/%C5-7环烷烷烃/%
X-2P2sh12.465.821.918.555.426.1
X-4P2sh24.558.217.330.956.512.6
X-5-1P2sh14.966.718.515.347.037.7
X-5-2P2sh14.565.719.825.652.022.4
X-8P2sh26.853.519.730.646.522.9
X-9P2sh26.652.720.814.426.858.8
X-7P2sh29.157.013.935.943.920.2
X-13P1s22.660.616.833.052.314.7
X-14-1P1t14.463.721.913.234.252.5
X-14-2P1t12.169.618.320.244.835.0
X-17P1t15.267.817.018.239.742.1

表3

鄂尔多斯盆地临兴地区上古生界烃源岩地球化学参数"

类别有机碳/%(S1+S2)/(mg/g)RO/%Tmax/℃
P1s58.50~74.0063.82551.57~167.84102.91(5)0.98~1.131.07(5)458.0~463.0461.0(7)
暗色泥岩0.75~21.803.28(49)0.54~71.105.03(37)0.78~1.380.98(31)426.0~480.0461.0(35)
P1t45.60~76.1063.28(16)45.33~309.37158.53(13)0.87~1.451.18(9)447.0~501.0463.2(23)
暗色泥岩0.82~19.204.16(22)0.53~8.812.80(17)0.81~1.421.07(24)442.0~510.0470.3(20)
C2b39.60~84.6064.03(14)38.67~250.00118.18(10)0.93~1.481.21(8)454.0~517.0485.3(15)
暗色泥岩0.78~12.003.66(30)0.58~17.933.12(25)0.89~1.391.12(29)450.0~508.0482.7(30)

图2

临兴地区上古生界天然气单体碳同位素分布特征"

图3

天然气δ13C1—δ13C2成因类型鉴别图版(图版来自于文献[43];大牛地数据来自于文献[33])"

图4

天然气δ13C1—δ13C2成因类型鉴别图版(图版来自于文献[44])"

图5

天然气δ13C1—δ13C2—δ13C3成因类型鉴别图版(图版来自文献[1])"

图6

天然气中C7轻烃系列分布三角图"

图7

天然气中C5-7轻烃系列分布三角图"

表4

临兴地区上古生界天然气K1值和K2值分布"

井号层位A1/%A2/%P2/%P3/%N2/%K1/%K2/%
X-4P2h2.222.082.992.531.061.060.63
X-5-1P2h4.523.995.024.502.781.130.58
X-5-2P2h2.191.872.422.841.551.170.71
X-8P2h3.062.704.322.001.481.130.34
X-9P2h9.977.8314.0410.024.951.270.53
X-7P2h3.322.664.692.081.631.250.33
X-13P1s1.881.682.641.641.151.120.43
X-14-1P1t3.353.214.014.563.321.040.62
X-14-2P1t2.072.032.723.042.301.020.61
X-17P1t3.193.294.414.002.420.970.59

图8

临兴地区上古生界天然气K1值和K2值斜率分布"

图9

临兴地区上古生界天然气Ln(C1/C2)—(δ13C1-δ13C2)关系"

图10

临兴地区上古生界天然气δ13C1—(C2/C1)"

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