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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.

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The cross plot showing the relationship between U/Th ratios and Ni/Co ratios of Miocene source rocks in the Qiongdongnan Basin. Note: the samples in the chart are from the whole region of the basin. The information of the samples mainly represents the shallow water area because most of the wells distribute in the shallow water area (mainly in delta or coastal area).
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fig7: The cross plot showing the relationship between U/Th ratios and Ni/Co ratios of Miocene source rocks in the Qiongdongnan Basin. Note: the samples in the chart are from the whole region of the basin. The information of the samples mainly represents the shallow water area because most of the wells distribute in the shallow water area (mainly in delta or coastal area).

Mentions: As shown in Figure 7, U/Th ratios of marine source rocks mainly range from 0.17 to 0.39 with an average of 0.20, and Ni/Co ratios vary from 1.13 to 4.32 with an average of 2.77. It infers that the source rocks were mainly developed in oxidized environment. The trace element from well BD20-1-1 near the central depression belt reveals that the average ratios of U/Th and Ni/Co of Miocene marine source rocks are 0.21 and 3.29, respectively (Table 2; Figure 8), which are relatively higher than the average ratios in marine source rocks mentioned above. The above analysis shows that Miocene source rocks were mainly developed in oxidized conditions, and the OM preservation conditions were getting better with water depth increasing.


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)

The cross plot showing the relationship between U/Th ratios and Ni/Co ratios of Miocene source rocks in the Qiongdongnan Basin. Note: the samples in the chart are from the whole region of the basin. The information of the samples mainly represents the shallow water area because most of the wells distribute in the shallow water area (mainly in delta or coastal area).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig7: The cross plot showing the relationship between U/Th ratios and Ni/Co ratios of Miocene source rocks in the Qiongdongnan Basin. Note: the samples in the chart are from the whole region of the basin. The information of the samples mainly represents the shallow water area because most of the wells distribute in the shallow water area (mainly in delta or coastal area).
Mentions: As shown in Figure 7, U/Th ratios of marine source rocks mainly range from 0.17 to 0.39 with an average of 0.20, and Ni/Co ratios vary from 1.13 to 4.32 with an average of 2.77. It infers that the source rocks were mainly developed in oxidized environment. The trace element from well BD20-1-1 near the central depression belt reveals that the average ratios of U/Th and Ni/Co of Miocene marine source rocks are 0.21 and 3.29, respectively (Table 2; Figure 8), which are relatively higher than the average ratios in marine source rocks mentioned above. The above analysis shows that Miocene source rocks were mainly developed in oxidized conditions, and the OM preservation conditions were getting better with water depth increasing.

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