Diagenesis and porosity evolution of high-temperature and overpressure sandstone reservoirs in submarine fans of the west area of the Qiongdongnan Basin

HU Desheng; ZHONG Jia; MAN Yong; SUN Wenzhao; BAI Nan; DAI Yining; LIU Zhixuan; YUAN Zhenzhu; HU Kun; LI Liang

doi:10.19826/j.cnki.1009-3850.2025.05001

2025 Vol. 45, No. 2

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HU Desheng, ZHONG Jia, MAN Yong, SUN Wenzhao, BAI Nan, DAI Yining, LIU Zhixuan, YUAN Zhenzhu, HU Kun, LI Liang. 2025. Diagenesis and porosity evolution of high-temperature and overpressure sandstone reservoirs in submarine fans of the west area of the Qiongdongnan Basin. Sedimentary Geology and Tethyan Geology, 45(2): 294-304. doi: 10.19826/j.cnki.1009-3850.2025.05001

Citation:

HU Desheng, ZHONG Jia, MAN Yong, SUN Wenzhao, BAI Nan, DAI Yining, LIU Zhixuan, YUAN Zhenzhu, HU Kun, LI Liang. 2025. Diagenesis and porosity evolution of high-temperature and overpressure sandstone reservoirs in submarine fans of the west area of the Qiongdongnan Basin. Sedimentary Geology and Tethyan Geology, 45(2): 294-304. doi: 10.19826/j.cnki.1009-3850.2025.05001

Diagenesis and porosity evolution of high-temperature and overpressure sandstone reservoirs in submarine fans of the west area of the Qiongdongnan Basin

Zhanjiang Branch of China National Offshore Oil Corporation Ltd., Zhanjiang 524057, China

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Corresponding author: ZHONG Jia, zhongjia2@cnooc.com.cn

Received Date: 22 September 2023

Revised Date: 20 January 2024

Accepted Date: 17 April 2024

Publish Date: 20 June 2025

Abstract

Abstract

Submarine fans in the west area of the Qiongdongnan Basin, located on the continental shelf in the northern of the South China Sea, are the main area for gas exploration. These submarine fans are commonly characterized by high-temperature and overpressure diagenetic environments. A comprehensive analysis was conducted to evaluate diagenesis and porosity evolution of submarine fan reservoirs in the Meishan Formation of the Ledong-Lingshui Sag in the west area of the Qiongdongnan Basin. The analysis incorporates thin-section identification, image analysis, fluid inclusion analysis, clay X-ray diffraction, scanning electron microscope (SEM), and physical property test, with comprehensive consideration of the burial-thermal and hydrocarbon charging history of the reservoirs. The results show that the submarine fan reservoirs are in the A-mesodiagenesis stage, with reservoirs exhibiting low to moderate porosity and low to extra-low permeability. The diagenetic and accumulation sequence progresses as follows: early clay mineral precipitation → first phase of accumulation → feldspar micro-dissolution → second phase of accumulation → quartz overgrowth and intense feldspar dissolution → ferrocalcite and dolomite cementation → quartz and quartz overgrowth dissolution → third phase of accumulation and CO₂ charging → micro-dissolution of carbonate cements. The porosity evolution model follows a "first overpressure, later accumulation, and then compaction" pattern, characterized by "significant porosity reduction due to compaction; porosity reduction from ferrocalcite cementation; porosity conservation under overpressure conditions; moderate porosity increase due to dissolution".
- west area of the Qiongdongnan Basin /
- Ledong-Lingshui Sag /
- Meishan Formation /
- submarine fan /
- reservior /
- diagenesis /
- porosity evolution

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References

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