琼东南盆地裂后期S40界面特征及其地质意义

苏明; 解习农; 姜涛; 李俊良; 孙志鹏; 田姗姗; 张成; 何云龙; 张翠梅

doi:10.3799/dqkx.2011.093

Volume 36 Issue 5

Sep. 2011

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Article Navigation > Earth Science > 2011 > 36(5): 886-894

SU Ming, JIE Xi-nong, JIANG Tao, LI Jun-liang, SUN Zhi-peng, TIAN Shan-shan, ZHANG Cheng, HE Yun-long, ZHANG Cui-mei, 2011. Characteristics of S40 Boundary and Its Significance in Qiongdongnan Basin, Northern Continental Margin of South China Sea. Earth Science, 36(5): 886-894. doi: 10.3799/dqkx.2011.093

Citation:

SU Ming, JIE Xi-nong, JIANG Tao, LI Jun-liang, SUN Zhi-peng, TIAN Shan-shan, ZHANG Cheng, HE Yun-long, ZHANG Cui-mei, 2011. Characteristics of S40 Boundary and Its Significance in Qiongdongnan Basin, Northern Continental Margin of South China Sea. Earth Science, 36(5): 886-894. doi: 10.3799/dqkx.2011.093

Citation:

SU Ming, JIE Xi-nong, JIANG Tao, LI Jun-liang, SUN Zhi-peng, TIAN Shan-shan, ZHANG Cheng, HE Yun-long, ZHANG Cui-mei, 2011. Characteristics of S40 Boundary and Its Significance in Qiongdongnan Basin, Northern Continental Margin of South China Sea. Earth Science, 36(5): 886-894. doi: 10.3799/dqkx.2011.093

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Characteristics of S40 Boundary and Its Significance in Qiongdongnan Basin, Northern Continental Margin of South China Sea

doi: 10.3799/dqkx.2011.093

1.
CAS Key Laboratory of Renewable Energy and Gas Hydrate, Guangzhou 510640, China
2.
CAS Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Guangzhou 510301, China
3.
Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China
4.
Technical Department, China National Offshore Oil Corporation Limited, Zhanjiang 524057, China

Received Date: 2011-02-18
Publish Date: 2011-09-15

Abstract

Abstract

Based on the integrated study of 2D seismic data, well data and biostratigraphy in the Qiongdongnan basin (QDNB), the Late Miocene unconformity (S40) at about 11.6 Ma which separated the underlying Meishan and overlying Huangliu Formation is interpreted.The characters of S40 including sea level changes, seismic-sedimentary facies and subsidence rate show significant differences in its eastern and western areas as follows: (1) In the littoral-neritic area of the northwestern QDNB, it is angular with intense erosion of the underlying strata, and even erosion of the whole Meishan Formation. (2) In the bathyal-abyssal area of southeastern QDNB, Meishan Formation is characterized by higher amplitude, generally continuous-hummocky and even progradational reflection, whereas Huangliu Formation is featured with low-amplitude, continuous facies.We suggest that the S40 interface displaying different characteristics was controlled by different mechanism factors, the western basin was strongly eroded by the underlying strata under the influence of massive sea-level fall; whereas the eastern basin with great subsidence occurred due to the Xisha trough activity since Late Miocene.This tectonic activity caused the eastern QDNB to change abruptly from shallow water to semi-deep or deep water environment, consequently the basin exhibits deep and shallow landforms in the east and west respectively.This topography remains until the present day.The interpretation of S40 is helpful not only to explain the South China Sea evolution but also to predict potential reservoir target.
- Qiongdongnan basin,
- S40 boundary,
- tectonics,
- subsidence,
- Miocene,
- marine geology

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References(23)

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