Natural Gas Geoscience ›› 2021, Vol. 32 ›› Issue (8): 1117-1126.doi: 10.11764/j.issn.1672-1926.2021.03.017

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Geochemical characteristics and genesis of natural gas in Shaximiao Formation of Middle Jurassic in Sichuan Basin

Chunlong YANG1,2(),Zengye XIE1,2,Jian LI1,2,Jianying GUO1,2,Lu ZHANG1,2(),Hui JIN1,Cuiguo HAO1,Xiaobo WANG1,2,Zhisheng LI1,2,Jin LI1,2,Xuening QI1,2   

  1. 1.Research Institute of Petroleum Exploration & Development,Beijing 100083,China
    2.Key Laboratory of Gas Reservoir Formation and Development,CNPC,Langfang 065007,China
  • Received:2020-12-31 Revised:2021-03-11 Online:2021-08-10 Published:2021-08-25
  • Contact: Lu ZHANG E-mail:clyang@vip.qq.com;zhanglu812@petrochina.com.cn
  • Supported by:
    The China National Science and Technology Major Project(2016ZX05007-003);the China National Petroleum Corporation Science and Technology Project(2019B-0605)

Abstract:

Shaximiao Formation of Middle Jurassic in Sichuan Basin is an important field of natural gas exploration in Sichuan Basin under the situation of low oil price. However, the source of natural gas in different areas of the basin is not clear, which affects the next exploration deployment decision. The geochemical characteristics and genesis of natural gas in Jurassic Shaximiao Formation are studied. The results show that: (1) The natural gas of Shaximiao Formation belongs to kerogen degradation gas, with methane content more than 84%, containing a small amount of ethane, propane and other hydrocarbon gases and a small amount of nitrogen, carbon dioxide, and other non-hydrocarbon gases, without hydrogen sulfide. The maturity of natural gas in different regions is different. (2) The natural gas δ13C1 values are from -39.2‰ to -31.2‰, δ13C2 values are from -32.8‰ to -22.3‰, and δ13C3 values are from -28.7‰ to -19.5‰. The carbon isotope of natural gas is not reversed. The west of Sichuan is dominated by coal-derived gas, central Sichuan is characterized by oil-type gas, and eastern Sichuan is dominated by mixed gas between coal-derived gas and oil-type gas, mainly oil-type gas. (3) The difference of δ13C1 and δ13C2 values in different regions is related to the contribution ratio of different source rocks. The main source rocks in western Sichuan Basin and southwest Sichuan Basin are the coal bearing source rocks of the 5th Member of Xujiahe Formation, the Lower Jurassic lacustrine source rocks in central Sichuan Basin, and the source rocks of natural gas in eastern Sichuan Basin are from the 5th Member of Xujiahe Formation and Lower Jurassic. The research results have important guiding significance for the next natural gas exploration and deployment decision-making of Jurassic Shaximiao Formation in Sichuan Basin.

Key words: Middle Jurassic, Shaximiao Formation, Genesis of natural gas, Source rock, Geochemistry, Sichuan Basin

CLC Number: 

  • TE122.1+13

Fig.1

Gas field distribution of Jurassic Shaximiao Formation(a) and the comprehensive stratigraphic histogram of Jurassic strata in Sichuan Basin(b)(base map according to Ref.[1])"

Fig.2

Plane distribution of related source rocks of Jurassic Shaximiao Formation in Sichuan Basin(modified according to Ref.[7])"

Table 1

Gas composition and hydrocarbon isotope data of Jurassic Shaximiao Formation in Sichuan Basin"

地区气田井号主要组分/%δ13C/‰(VPDB)资料来源
CH4C2H6C3H8N2CO2CH4C2H6C3H8
川中八角场角61-488.677.162.250.250.2-38.2-31.8-22.8文献[2
角6284.898.873.321.030.03-37.7-32.8-22.9
角63-188.297.352.510.70.14-37.6-32.1-22.9
角7088.936.941.990.460.27-37.9-31.7-22.9
川西新场川孝134-32.7-25.7-23.6文献[13-14
川孝134-293.085.020.820.160.44-36.7-24.4-23.4
川孝3794.473.520.810.090.71-36.1-23-25.5
川孝16993.073.610.671.430.55文献[15
川孝91.955.21.460.360-33.4-24.8-22.3
川孝37493.563.380.690.930.78
新81493.52.990.581.410.78
川孝454-35.0-22.5-19.1
马沙1-33.5-23.8-19.8
川孝132-33.6-21.8-21.5
川孝117-34.8-23.5-21.0
川孝105-33.0-23.1-21.0
川孝480-191.655.71.340.32未测-34.8-23.7-20.1
秋林秋林200-H291.095.341.241.330-35.1-25.1-22.2本文
秋林207-591.605.751.320.340-35.2-25.1-22.1
洛带—新都龙652-34.4-23.5-20本文
龙651-35.6-23.7-21.3
川西南平落坝平落293.554.010.571.620.02-39.2-25.5-21.9文献[16-17
平落1-192.525.051.110.860.05-38.3-25-21.4
平浅192.465.031.310.530.53-38.5-25-21.7
平落1393.044.731.120.40.4-36.8-23.5-20.3
平浅996.42.140.280.950.95-34.1-23.8-19.9
大兴场大兴492.695.560.810.850.26-33.5-22.5-22.8文献[2
大兴597.342.040.270.430.3-33.3-22.5-21.4
白马庙白马196.782.340.330.051.6-33.9-22.4-19.8
白马292.964.090.920.051.49-33.9-22.3-19.5
川东渡口河渡594.183.480.90.640.11本文
渡590.083.370.790.590.11
渡2194.653.060.740.610.27
渡2193.943.420.830.950.22
渡2194.53.430.830.60.01
渡2194.723.210.780.60.05
渡2194.773.280.790.560.01
渡2193.584.0810.570.04
渡浅196.452.560.320.330.16-34.8-26.9-27
五宝场五宝浅1395.112.850.670.620-33.3-30.2-27.3
五宝浅892.293.170.712.810.13-31.2-30.1-27.9
五宝浅1-293.823.570.920.70-33.8-30.9-27.7
五宝浅6-194.443.010.591.090-31.7-31.3-28.7

Fig.3

Gas components genetic identification of Jurassic Shaximiao Formation in Sichuan Basin(plate according to Ref.[13])"

Fig.4

Carbon isotope analysis of natural gas from Jurassic Shaximiao Formation in Sichuan Basin"

Fig.5

Relationship between heptane number and isoheptane number of Middle Jurassic Shaximiao Formation natural gas in Sichuan Basin(some data are based on Refs.[7,29])"

Fig.6

Distribution map of K1 value of terrestrial natural gas in Sichuan Basin(some data are based on Refs.[7,29])"

Fig.7

Triangle diagram of C7 light hydrocarbon composition of terrestrial natural gas in Sichuan Basin(some data are based on Ref.[29])"

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