| Author's Name: ZHOU Gang1, ZHONG Yuan1, ZHANG Benjian1, QIAO Yanping1, DAI Xin1,
ZHANG Zili1, LAN Caijun1, DOU Shuang1, XU Duo2 |
| Institution: 1. Research Institute of Exploration and Development, PetroChina Southwest Oil and Gas Field Company;
2. Chengdu Ruilang Petroleum Technology Co., Ltd |
| Abstract: |
| The recent exploration discoveries in Luzhou area indicate that the reef-shoal body of the Silurian Shiniulan
Formation has certain potential for reservoir formation. A systematic study based on drilling, outcrop, and 3D seismic data
is conducted to explore the development characteristics and exploration significance of the reef-shoal body of Shiniulan
Formation. The results indicate that: (1) Reef/bioclastic limestone mainly develops at the top of the first member of
Shiniulan Formation, with a thickness ranging from 6 to 40 meters, characterized by moderate-strong amplitude and
medium-high frequency seismic reflection character. (2) Affected by the ancient uplift in central Sichuan, the first
member of the Shiniulan Formation is developed at mixed tidal flats and intra-platform depressions, forming contiguous
tidal edge reefs and shoals on the high terrain of the mixed tidal flats. At some high belts of the intra-platform
depressions, intra-platform reefs/bioclastic shoals are developed. (3) The reservoir formation model of Shiniulan
Formation is characterized by "near-source hydrocarbon generation, fault-mediated migration, lower-generation and
upper-reservoir storage, and composite accumulation". The high-quality hydrocarbon source rocks of the Longmaxi
Formation, the reef-shoal reservoir of the first member of Shiniulan Formation, the mudstone of the second member of
Shiniulan Formation and the overlying strata form a good source rock-reservoir-caprock combination. The complex
network fault system provides conditions for oil and gas migration, and the oil and gas filling period matches the trap
formation period (P-K), laying the foundation for large-scale oil and gas accumulation. The Shiniulan Formation reefshoal
body is an important oil and gas exploration field worthy of attention. |
| Keywords: reef limestone; seismic response; karstification; hydrocarbon accumulation; Shiniulan Formation; Sichuan
Basin |
|
投稿时间：
2025-07-01 |
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