Natural Gas Geoscience ›› 2020, Vol. 31 ›› Issue (7): 904-914.doi: 10.11764/j.issn.1672-1926.2020.03.010

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The characteristics and significances of cheilanthane tricyclic terpanes and bicyclic sesquiterpanes in source rocks and oils under different depositional environments in Zhu Ⅲ Depression, Pearl River Mouth Basin

Jun-jun YOU(),Xi-bing YANG,Ming-zhu LEI,Gang LIANG,Zi-ling WANG   

  1. Zhanjiang Branch of China National Offshore Oil Corporation Ltd. , Zhangjiang 524057, China
  • Received:2020-01-19 Revised:2020-03-28 Online:2020-07-10 Published:2020-07-02
  • Supported by:
    The Science and Technology Project of China National Offshore Oil Corporation Limited(YXKY-2018-KT-01)

Abstract:

The depositional environments and the oil-source relationship of the three important source rocks and their relative oils in Wenchang A/B Sag of Pearl River Mouth Basin have been elaborated by applying biomarkers of cheilanthane tricyclic terpanes and bicyclic sesquiterpanes in this article. The results suggest that the distribution characteristics of these two biomarkers in source rocks and oils are controlled by different sedimentary environments and variety inputs: (1)The mid-deep lacustrine source rocks and oils from Wenchang Formation have a very low abundance of rearrange drimanes, but a high abundance of 8β(H)-drimane, the C20-C21-C23 tricyclic terpanes appear to have similar mountain type distribution, indicating they are dominated by Lower biological algaes and formed in a partial reducing environment. (2)The shallow lacustrine source rocks and oils from Wenchang Formation have a middle abundance of drimanes and rearrange drimanes, the C19-C23 tricyclic terpanes appear to be rising type distribution with C23 the highest or decline gradually with C20 the highest, indicating they are dominated both by lower biological algaes and high plants inputs and formed in a reduction-oxidation environment. (3)The shallow lacustrine source rocks and oils from Enping Formation have a rich abundance of rearrange drimanes, but low abundance of drimanes, and the C19-C26 tricyclic terpanes decline quickly with C20 the highest, indicating they are dominated by high plants input and formed in an oxidation environment.

Key words: Zhu Ⅲ Depression, Cheilanthane tricyclic terpanes, Bicyclic sesquiterpanes, Depositional environment, Organic matter input, Oil-source correlation

CLC Number: 

  • TE122.1+13

Fig.1

Survey map of study area"

Fig.2

Sratigraphic column of Zhu Ⅲ Depression"

Fig.3

GC/MS chromatograms of biomarkers in source rocks and relative oils under different depositional environments in Wenchang A and B Sags"

Table 1

The ratio of cheilanthane tricyclic terpanes in source rocks and relative oils under different depositional environments in Wenchang A and B Sags"

样品类型长链三环萜烷/藿烷C21/(C19—C26)C20/(C19—C26)
分布范围/%平均值/%分布范围/%平均值/%分布范围/%平均值/%
文昌组中深湖相原油16.5~31.821.117.2~20.818.811.9~14.513.3
文昌组浅湖相原油12.0~15.813.512.8~17.014.211.5~17.714.2
恩平组浅湖相原油22.8~130.163.39.6~17.413.219.7~29.324.3
文昌组中深湖相烃源岩9.4~11.410.117.4~19.418.510.7~13.111.7
文昌组浅湖相烃源岩8.6~24.714.512.2~15.313.312.2~13.112.8
恩平组浅湖相烃源岩19.7~37.229.611.5~15.513.817.2~22.819.4

Fig.4

Relationship between the parameters of cheilanthane tricyclic terpanes and Pr/Ph in source rocks and relative oils under different depositional environments in Wenchang A and B Sags"

Table 2

Identitication of bicyclic sesquiterpanes in source rocks and crude oil by GC/MS"

峰号化合物化学式
14,4,8,10-四甲基十氢化萘C14H26
2*C14-倍半萜烷C14H26
3新C15-倍半萜烷C15H28
44,4,8,8,9-五甲基十氢化萘C15H28
54,4,8,9,9-五甲基十氢化萘C15H28
68β(H)-补身烷C15H28
74,4,9,9,10-五甲基十氢化萘C15H28
88α(H)-补身烷C16H30
9*C16-二环倍半萜C16H30
10*C16-二环倍半萜C16H30
118β(H)-升补身烷C16H30

Fig.5

Distribution characteristics and identification of bicyclic sesquiterpanes"

Table 3

The ratio of bicyclic sesquiterpanes in source rocks and relative oils under different depositional environments in Wenchang A and B Sags"

8β(H)-升补身烷/4,4,8,8,9 - 五甲基十氢化萘4,4,8,8,9 - 五甲基十氢化萘/8β(H)-补身烷4,4,8,9,9 - 五甲基十氢化萘/ 8β(H)-补身烷
分布范围平均值分布范围平均值分布范围平均值
文昌组中深湖相原油0.955~6.9192.7500.531~1.2370.9370.442~1.2160.994
文昌组浅湖相原油1.480~3.4022.3451.183~1.6321.3151.292~1.5441.410
恩平组浅湖相原油0.119~0.4580.2312.898~6.1644.2621.246~1.7811.473
文昌组中深湖相烃源岩2.603~19.88910.6630.481~0.7820.5990.934~1.0300.991
文昌组浅湖相烃源岩1.45~6.373.0000.461~1.6321.0690.319~1.5441.011
恩平组浅湖相烃源岩0.955~1.8741.2701.31~2.8012.1610.809~1.5361.340

Fig.6

Relationship between the parameters of bicyclic sesquiterpanes and Pr/Ph in oils with different resources in Wenchang A and B Sags"

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