Seismic responses and forming conditions of the Oligocene shelf-edge delta and deepwater fan system in Changchang-Heshan sag,northern South China Sea
Zhu Xiaomin1, Ge Jiawang1, Song Shuang1, Wang Ruiliang2, Yuan Lizhong2, Liu Jun2
1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249; 2 The Research Institute of Shengzhen Branch, CNOOC Limited,Guangzhou 510240,Guangdong;
Abstract Changchang-Heshan sag is a deepwater sedimentary basin and located on the continental slope in the northern South China Sea. It is an important strategic exploration block after oil and gas exploration breakthrough in Baiyun and Liwan sags in adjacent deep-water regions. Guided by the theory of classic sequence stratigraphy and based on the characteristics of the seismic reflection and stratigraphic cycles,the Oligocene Zhuhai Formation could be divided into six third-order sequences(namely ZHSQ1,ZHSQ2,ZHSQ3,ZHSQ4,ZHSQ5 and ZHSQ6 from bottom to top). Six types of seismic facies,including high continuity,weak-medium amplitude sheet seismic facies of shelf,S-shaped and oblique progradational seismic facies of shelf-edge,variable amplitude,medium continuity,mound-shaped bidirectional overlap seismic facies of continental slope and so on,are identified within the Zhuhai Formation. S-shaped and oblique progradational seismic facies represents shelf-edge delta,while mound-shaped bidirectional overlap seismic facies represents deepwater fan. The shelf-edge delta and deepwater fan systems have been changed with the formation condition of tectonic and sea level variation. The results show that during the deposition of ZHSQ1 and ZHSQ2,the boundary faults of the sag were active and the shelf slope-break belt was controlled by these faults. The depositional system was limited by the assemblage of shallow marine and proximal deltas. The basin stepped into depression stage and the boundary faults were inactive during the depositional period from ZHSQ3 to ZHSQ6;meanwhile,the shelf slope-break belt was characterized by the sedimentary slope break belts,migrated forward to the central sea direction and became larger all the time under the control of relative sea level falling with stable material source supply from the ancient Pearl River. At the same time,the shelf-edge delta prograded with distance nearly 20,km,and the slope got increasingly steep. Therefore,the occurrence frequency and scale of deep-water fans in front of the shelf-edge delta increased from early to late,and the position became closer to the shelf-edge delta.
Fund:Financially supported by National Science and Technology Major Projects of Oil and Gas (No.2011ZX05025-005-02)
Cite this article:
Zhu Xiaomin,Ge Jiawang,Song Shuang et al. Seismic responses and forming conditions of the Oligocene shelf-edge delta and deepwater fan system in Changchang-Heshan sag,northern South China Sea[J]. JOPC, 2016, 18(3): 367-380.
Zhu Xiaomin,Ge Jiawang,Song Shuang et al. Seismic responses and forming conditions of the Oligocene shelf-edge delta and deepwater fan system in Changchang-Heshan sag,northern South China Sea[J]. JOPC, 2016, 18(3): 367-380.
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