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.

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The maceral characteristics of the marine source rocks in the Sanya formation in different structures of the Qiongdongnan Basin.
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Related In: Results  -  Collection


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fig4: The maceral characteristics of the marine source rocks in the Sanya formation in different structures of the Qiongdongnan Basin.

Mentions: However, due to the lack of large rivers or delta deposits, insufficient supply of TOM led to low OM abundance of the marine source rocks in the Lingshui, Sanya, and Meishan formations in the Qiongdongnan Basin. OM abundance of source rocks in the above formations is much lower than that from Zhuhai, Zhujiang, and Hanjiang formations, respectively, in Pearl River Mouth Basin [26]. To illustrate the idea, we chose maceral of the marine source rocks in the Sanya formation of the Qiongdongnan Basin as comparison basis to study the data from several exploratory wells drilled through structural belts from shallower water to deep water. The YC7-4, YC19-1, YC21-1, and YC35-1 structures were mainly developed in settings changing from fan delta and onshore to littoral-neritic and neritic to bathyal environment. The results show that, from shallower area to deep water, the marine source rocks in the Sanya formation have decreasing content of vitrinite and increasing content of sapropelinite (Figure 4), indicating lessening contribution of terrestrial higher plants and increasing input of algae to the formation of Miocene marine source rocks as water becomes deeper. In conclusion, the TOM input to Miocene marine source rocks in the Qiongdongnan Basin was relatively insufficient, and its contribution to the source rocks was shrinking with increasing water depth.


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 maceral characteristics of the marine source rocks in the Sanya formation in different structures of the Qiongdongnan Basin.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig4: The maceral characteristics of the marine source rocks in the Sanya formation in different structures of the Qiongdongnan Basin.
Mentions: However, due to the lack of large rivers or delta deposits, insufficient supply of TOM led to low OM abundance of the marine source rocks in the Lingshui, Sanya, and Meishan formations in the Qiongdongnan Basin. OM abundance of source rocks in the above formations is much lower than that from Zhuhai, Zhujiang, and Hanjiang formations, respectively, in Pearl River Mouth Basin [26]. To illustrate the idea, we chose maceral of the marine source rocks in the Sanya formation of the Qiongdongnan Basin as comparison basis to study the data from several exploratory wells drilled through structural belts from shallower water to deep water. The YC7-4, YC19-1, YC21-1, and YC35-1 structures were mainly developed in settings changing from fan delta and onshore to littoral-neritic and neritic to bathyal environment. The results show that, from shallower area to deep water, the marine source rocks in the Sanya formation have decreasing content of vitrinite and increasing content of sapropelinite (Figure 4), indicating lessening contribution of terrestrial higher plants and increasing input of algae to the formation of Miocene marine source rocks as water becomes deeper. In conclusion, the TOM input to Miocene marine source rocks in the Qiongdongnan Basin was relatively insufficient, and its contribution to the source rocks was shrinking with increasing water depth.

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
Related in: MedlinePlus