Limits...
Palaeoenvironment and its control on the formation of Miocene marine source rocks in the Qiongdongnan Basin, northern South China Sea.

Li W, Zhang Z, Wang W, Lu S, Li Y, Fu N - ScientificWorldJournal (2014)

Bottom Line: This realization, in return, has led to the recognition that the developmental environment and pattern of marine source rocks, especially for the source rocks in continental margin basins, are still controversial or poorly understood.This paper attempts to reveal the hydrocarbon potential of the Miocene marine source rocks in different environment and speculate the quality of source rocks in bathyal region of the continental slope without exploratory well.Our results highlight the palaeoenvironment and its control on the formation of Miocene marine source rocks in the Qiongdongnan Basin of the northern South China Sea and speculate the hydrocarbon potential of the source rocks in the bathyal region.

View Article: PubMed Central - PubMed

Affiliation: Research Institute of Unconventional Petroleum and Renewable Energy, China University of Petroleum, Qingdao 266580, China ; School of Geosciences, China University of Petroleum, Qingdao 266580, China.

ABSTRACT
The main factors of the developmental environment of marine source rocks in continental margin basins have their specificality. This realization, in return, has led to the recognition that the developmental environment and pattern of marine source rocks, especially for the source rocks in continental margin basins, are still controversial or poorly understood. Through the analysis of the trace elements and maceral data, the developmental environment of Miocene marine source rocks in the Qiongdongnan Basin is reconstructed, and the developmental patterns of the Miocene marine source rocks are established. This paper attempts to reveal the hydrocarbon potential of the Miocene marine source rocks in different environment and speculate the quality of source rocks in bathyal region of the continental slope without exploratory well. Our results highlight the palaeoenvironment and its control on the formation of Miocene marine source rocks in the Qiongdongnan Basin of the northern South China Sea and speculate the hydrocarbon potential of the source rocks in the bathyal region. This study provides a window for better understanding the main factors influencing the marine source rocks in the continental margin basins, including productivity, preservation conditions, and the input of terrestrial organic matter.

Show MeSH
Seismic profile across Yabei, Yanan, and Ledong Sags in the west of the Qiongdongnan Basin. The position of the three sags is showed in Figure 1.
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fig9: Seismic profile across Yabei, Yanan, and Ledong Sags in the west of the Qiongdongnan Basin. The position of the three sags is showed in Figure 1.

Mentions: Figure 9 shows a seismic section crossing three sags (Yabei, Yanan, and Ledong) in the west of the basin. The faulting activities controlled the development of the Oligocene stratum but were almost stopped during Miocene. The thickness of layers in Ledong Sag increased apparently in the central depression belt (Figure 9). Stratigraphic profile in Miocene is restored through the above section, which is shown in Figure 10. Data from wells YC8-2-1, YC21-1-4, and YC35-1-1 (the distance to the section is, resp., 5, 3, and 25 kilometers) reveal that the OM abundance of Miocene marine source rocks gets better with water depth increasing in the basin. It is attributed to the relatively better paleoproductivity and redox conditions from shallow area to deeper water though the contribution of TOM to source rocks was gradually decreasing. Thus it is speculated that the Miocene marine source rocks in a bathyal region, where there are still no drilling wells, have better hydrocarbon potential owing to relatively higher productivity and better preservation conditions of OM.


Palaeoenvironment and its control on the formation of Miocene marine source rocks in the Qiongdongnan Basin, northern South China Sea.

Li W, Zhang Z, Wang W, Lu S, Li Y, Fu N - ScientificWorldJournal (2014)

Seismic profile across Yabei, Yanan, and Ledong Sags in the west of the Qiongdongnan Basin. The position of the three sags is showed in Figure 1.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4221886&req=5

fig9: Seismic profile across Yabei, Yanan, and Ledong Sags in the west of the Qiongdongnan Basin. The position of the three sags is showed in Figure 1.
Mentions: Figure 9 shows a seismic section crossing three sags (Yabei, Yanan, and Ledong) in the west of the basin. The faulting activities controlled the development of the Oligocene stratum but were almost stopped during Miocene. The thickness of layers in Ledong Sag increased apparently in the central depression belt (Figure 9). Stratigraphic profile in Miocene is restored through the above section, which is shown in Figure 10. Data from wells YC8-2-1, YC21-1-4, and YC35-1-1 (the distance to the section is, resp., 5, 3, and 25 kilometers) reveal that the OM abundance of Miocene marine source rocks gets better with water depth increasing in the basin. It is attributed to the relatively better paleoproductivity and redox conditions from shallow area to deeper water though the contribution of TOM to source rocks was gradually decreasing. Thus it is speculated that the Miocene marine source rocks in a bathyal region, where there are still no drilling wells, have better hydrocarbon potential owing to relatively higher productivity and better preservation conditions of OM.

Bottom Line: This realization, in return, has led to the recognition that the developmental environment and pattern of marine source rocks, especially for the source rocks in continental margin basins, are still controversial or poorly understood.This paper attempts to reveal the hydrocarbon potential of the Miocene marine source rocks in different environment and speculate the quality of source rocks in bathyal region of the continental slope without exploratory well.Our results highlight the palaeoenvironment and its control on the formation of Miocene marine source rocks in the Qiongdongnan Basin of the northern South China Sea and speculate the hydrocarbon potential of the source rocks in the bathyal region.

View Article: PubMed Central - PubMed

Affiliation: Research Institute of Unconventional Petroleum and Renewable Energy, China University of Petroleum, Qingdao 266580, China ; School of Geosciences, China University of Petroleum, Qingdao 266580, China.

ABSTRACT
The main factors of the developmental environment of marine source rocks in continental margin basins have their specificality. This realization, in return, has led to the recognition that the developmental environment and pattern of marine source rocks, especially for the source rocks in continental margin basins, are still controversial or poorly understood. Through the analysis of the trace elements and maceral data, the developmental environment of Miocene marine source rocks in the Qiongdongnan Basin is reconstructed, and the developmental patterns of the Miocene marine source rocks are established. This paper attempts to reveal the hydrocarbon potential of the Miocene marine source rocks in different environment and speculate the quality of source rocks in bathyal region of the continental slope without exploratory well. Our results highlight the palaeoenvironment and its control on the formation of Miocene marine source rocks in the Qiongdongnan Basin of the northern South China Sea and speculate the hydrocarbon potential of the source rocks in the bathyal region. This study provides a window for better understanding the main factors influencing the marine source rocks in the continental margin basins, including productivity, preservation conditions, and the input of terrestrial organic matter.

Show MeSH