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Natural Gas Geoscience ›› 2020, Vol. 31 ›› Issue (1): 61-72.doi: 10.11764/j.issn.1672-1926.2019.10.001

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Characteristics of crude oil geochemical characteristics and oil source comparison in the western part of Qaidam Basin

Mai ZHANG1,2(),Cheng-lin LIU1,2(),Ji-xian TIAN3,Hao PANG4,Xu ZENG3,Hua KONG3,Sai YANG1,2   

  1. 1.State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China
    2.College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China
    3.PetroChina Exploration and Development Research Institute, Langfang 065007, China
    4.No. 5 Oil Production Plant of Qinghai Oilfield Company, Dunhuang 736200, China
  • Received:2019-07-13 Revised:2019-10-02 Online:2020-01-10 Published:2020-01-09
  • Contact: Cheng-lin LIU E-mail:790369252@qq.com;liucl@cup.edu.cn
  • Supported by:
    National Science Foundation of China(41272159)

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Abstract:

The Cenozoic in the western part of the Qaidam Basin is rich in oil and gas resources and has good prospects for exploration. Based on the biomarker composition characteristics of crude oil and source rocks, this paper discusses the maturity, sedimentary environment and organic matter sources of crude oil, so as to classify crude oil genesis and oil source comparison. Studies have found that crude oil has a lower maturity and is formed in a reducing environment with high salinity. The source of organic matter is a mixed source, and the input of lower aquatic plants is large. Crude oil can be classified into four categories based on the crude oil deposition environment, parent material source and maturity characteristics. The first kind of crude oil is mainly from the Shizigou-Yuejin areas, with high gamma wax content, low planting ratio, C27 decane advantage, and “hook-tail” phenomenon; the second kind of crude oil is mainly from the Cherick-Zhahaquan areas and the Nanyishan-Youquanzi areas, which has the advantage of C27 decane and no “hook-tail” phenomenon, the content of gamma wax is lower than the former; the third kind of crude oil is mainly from Dafengshan and Huangguamao regions, with C29 decane advantage and no “hook-tail” phenomenon; the fourth kind of crude oil is mainly from the Kaitemilik region, with C27 decane advantage and no “hook-tail” phenomenon, and the content of gamma wax is lower than that of others. The result of oil-source correlation shows that the crude oil is dominantly derived from E3 and N1 source rocks.

Key words: Western Qaidam Basin, Biomarker, Geochemical characteristics, Oil-source correlation

CLC Number: 

  • TE122.1+13

Fig.1

Tectonic zoning and stratigraphic features of the western part of Qaidam Basin(modified from the Ref.[7-8])"

Fig.2

Distribution characteristics of crude oil paraff in series in the western part of Qaidam Basin"

Table 1

Parameters of crude oil biomarker compounds in the western part of Qaidam Basin"

地区井名深度/m层位CPIOEPPr/Ph

C24TeT

/C23TT

C24TeT/C30H

Ga/

C30H

Ts/TmC29-αββ/（αββ+ααα）

C29-ααα20S

/(20R+20S)

C31αβ22S/

（22S+22R）

扎哈泉扎7-2-33 546.4~3 552.0N11.021.050.650.110.070.561.100.460.470.64
扎2183 732.0~3 740.0N11.000.960.580.190.050.410.650.400.390.62
扎11-8-52 478.2~2 494.1N210.950.900.500.190.060.610.510.300.360.61
扎平13 269.0~4 147.0N210.991.020.580.230.060.540.660.350.400.61
南翼山南H3-41 790.14~2 001.87N210.970.940.610.180.090.400.940.410.430.61
南H6-41 751.72~1 989.52N210.950.910.560.370.080.430.750.420.400.61
开特米里克开特09-1124.13~378.86N221.031.020.840.370.060.280.900.330.240.58
开特14-1-N221.061.020.900.350.070.270.950.360.230.59
大风山风21-5-2882.7~998N221.010.960.780.370.060.311.160.490.470.61
风17-5-2866.6~986.2N221.010.950.800.350.060.321.150.500.470.60
狮子沟狮524 416~4 426E320.910.850.450.340.160.810.560.520.520.67
狮2053 380~3 598E320.890.800.340.240.070.940.980.420.420.63
切克里克切6H2061 943.3~2 011.2E311.011.030.620.200.070.550.980.420.460.62
切12H12 150~2 340E31.020.990.540.250.070.620.660.370.440.61
跃进跃75211 431.4~1 511.6N10.950.890.370.290.090.780.360.250.290.58
油泉子油1-581 57.74~676.81N20.940.880.540.330.090.470.750.380.360.61
油1-30136.4~526.03N20.930.880.520.330.140.470.880.400.380.60
黄瓜峁峁平12 695~2 901N210.940.930.650.290.070.472.300.560.540.63

Fig.3

Chromatogram of crude oil m/z=191 in the western part of Qaidam Basin"

Fig.4

Correlation between Ga/C30H-Pr/Ph of crude oil in the western part of Qaidam Basin"

Fig.5

Chromatogram of crude oil m/z=217 in the western part of Qaidam Basin"

Fig.6

Correlation between crude oil C29-20S/(20S+20R)-C29-αββ/(ααα+αββ) in the western part of Qaidam Basin"

Fig.7

Classification of crude oil genesis in the western part of Qaidam Basin"

Fig.8

Comparison of parameters of biomarkers of crude oil and source rock in the western part of Qaidam Basin"

Fig.9

Comparison of biomass characteristics of crude oil and source rocks in Shizigou-Yuejin areas"

Fig.10

Comparison of biomass characteristics of crude oil and source rocks in Cherick-Unan areas"

Fig.11

Comparison of biomass characteristics of crude oil and source rocks in Nanyishan area"

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