Shallow meandering river delta in the Huagang Formation in the southern Xihu Sag, East China Sea Basin

CHEN Chunfeng; CHEN Zhongyun; WAN Yanzhou; CHEN Jianwen; XU Donghao; FENG Zhenming; YU Weizhe; JIANG Xue

doi:10.16562/j.cnki.0256-1492.2024040801

2024 Vol. 44, No. 6

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Article navigation > Marine Geology & Quaternary Geology > 2024 > 44(6): 175-185

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CHEN Chunfeng, CHEN Zhongyun, WAN Yanzhou, CHEN Jianwen, XU Donghao, FENG Zhenming, YU Weizhe, JIANG Xue. Shallow meandering river delta in the Huagang Formation in the southern Xihu Sag, East China Sea Basin[J]. Marine Geology & Quaternary Geology, 2024, 44(6): 175-185. doi: 10.16562/j.cnki.0256-1492.2024040801

Citation:

CHEN Chunfeng, CHEN Zhongyun, WAN Yanzhou, CHEN Jianwen, XU Donghao, FENG Zhenming, YU Weizhe, JIANG Xue. Shallow meandering river delta in the Huagang Formation in the southern Xihu Sag, East China Sea Basin[J]. Marine Geology & Quaternary Geology, 2024, 44(6): 175-185. doi: 10.16562/j.cnki.0256-1492.2024040801

Shallow meandering river delta in the Huagang Formation in the southern Xihu Sag, East China Sea Basin

1.
Shanghai Branch of CNOOC China Ltd., Shanghai 200335, China
2.
Ministry of Land and Resources, Qingdao Institute of Marine Geology, Qingdao 266237, China

More Information

Corresponding author: CHEN Jianwen, jwchen1012@126.com

Received Date: 08 April 2024

Revised Date: 02 June 2024

Accepted Date: 02 June 2024

Publish Date: 28 December 2024

Abstract

Abstract

In response to the difficulties in studying the sedimentary facies of the H5 and H4 sand formations in the upper section of the Huagang Formation in the southern Xihu Sag of the East China Sea Basin, we established a new method and process for dividing facies zones in shallow water deltas, namely "single well facies determination - planar sand tracing - shoreline tracing - zoning and delineation" using seismic data and core data. Results shows that the study area had the geological background for the formation of shallow meandering river delta, in which a unique alternating sedimentary zone of different facies were formed. During the deposit period of the H5 and H4 sand groups, the terrain in the basin was wide and gentle, and water level changed frequently between flood season and dry season, resulting in the alternating deposits of delta plain facies and delta front facies in a short period in the central part of the study area. In the flood season, delta front and shallow lake sediments developed in the central part of the study area, while in dry season, delta plain developed. Under the guide of sedimentary model of shallow meandering river delta, many of river channel sand bodies were found in the central part of the study area. The channel sandstone bodies overlap on the large anticline structures, forming numerous litho-structural composite traps with great exploration potential. The research results were confirmed by new oil and gas discoveries.
- shallow meandering river delta /
- alternating deposit /
- sand body distribution /
- Xihu Sag /
- Huagang Formation

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References

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