Dissolution mechanism of a deep-buried sandstone reservoir in a deep water area: A case study from Baiyun Sag, Zhujiang River (Pearl River) Mouth Basin

Jihua Liao; Keqiang Wu; Lianqiao Xiong; Jingzhou Zhao; Xin Li; Chunyu Zhang

doi:10.1007/s13131-022-2142-x

Volume 42 Issue 3

Mar. 2023

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Article Navigation > Acta Oceanologica Sinica > 2023 > 42(3): 151-166

Jihua Liao, Keqiang Wu, Lianqiao Xiong, Jingzhou Zhao, Xin Li, Chunyu Zhang. Dissolution mechanism of a deep-buried sandstone reservoir in a deep water area: A case study from Baiyun Sag, Zhujiang River (Pearl River) Mouth Basin[J]. Acta Oceanologica Sinica, 2023, 42(3): 151-166. doi: 10.1007/s13131-022-2142-x

Citation:

Jihua Liao, Keqiang Wu, Lianqiao Xiong, Jingzhou Zhao, Xin Li, Chunyu Zhang. Dissolution mechanism of a deep-buried sandstone reservoir in a deep water area: A case study from Baiyun Sag, Zhujiang River (Pearl River) Mouth Basin[J]. Acta Oceanologica Sinica, 2023, 42(3): 151-166. doi: 10.1007/s13131-022-2142-x

Citation:

Jihua Liao, Keqiang Wu, Lianqiao Xiong, Jingzhou Zhao, Xin Li, Chunyu Zhang. Dissolution mechanism of a deep-buried sandstone reservoir in a deep water area: A case study from Baiyun Sag, Zhujiang River (Pearl River) Mouth Basin[J]. Acta Oceanologica Sinica, 2023, 42(3): 151-166. doi: 10.1007/s13131-022-2142-x

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Dissolution mechanism of a deep-buried sandstone reservoir in a deep water area: A case study from Baiyun Sag, Zhujiang River (Pearl River) Mouth Basin

doi: 10.1007/s13131-022-2142-x

1.
China National Offshore Oil Corporation (CNOOC) Research Institute Co., Ltd., Beijing 100028, China
2.
Hainan Branch of China National Offshore Oil Corporation (CNOOC) Co., Ltd., Haikou 570311, China
3.
School of Earth Sciences and Engineering Xi’an Shiyou University, Xi’an Petroleum University, Xi’an 710065, China

Funds: The National Natural Science Foundation of China under contract No. 42202157; the China National Offshore Oil Corporation Co., Ltd. Major Production and Scientific Research Program under contract No. 2019KT-SC-22.

More Information

Corresponding author: E-mail: lixin71@cnooc.com.cn
Received Date: 2022-03-28
Accepted Date: 2022-12-27

Available Online: 2023-01-18

Publish Date: 2023-03-25

Abstract

Abstract

Dissolution mechanism and favorable reservoir distribution prediction are the key problems restricting oil and gas exploration in deep-buried layers. In this paper, the Enping Formation and Zhuhai Formation in Baiyun Sag of South China Sea was taken as a target. Based on the thin section, scanning electron microscopy, X-ray diffraction, porosity/permeability measurement, and mercury injection, influencing factors of dissolution were examined, and a dissolution model was established. Further, high-quality reservoirs were predicted temporally and spatially. The results show that dissolved pores constituted the main space of the Paleogene sandstone reservoir. Dissolution primarily occurred in the coarse- and medium-grained sandstones in the subaerial and subaqueous distributary channels, while dissolution was limited in fine-grained sandstones and inequigranular sandstones. The main dissolved minerals were feldspar, tuffaceous matrix, and diagenetic cement. Kaolinization of feldspar and illitization of kaolinite are the main dissolution pathways, but they occur at various depths and temperatures with different geothermal gradients. Dissolution is controlled by four factors, in terms of depositional facies, source rock evolution, overpressure, and fault activities, which co-acted at the period of 23.8–13.8 Ma, and resulted into strong dissolution. Additionally, based on these factors, high-quality reservoirs of the Enping and Zhuhai formations are predicted in the northern slope, southwestern step zone, and Liuhua uplift in the Baiyun Sag.
- dissolution mechanism,
- deep-buried reservoir,
- diagenesis evolution,
- reservoir prediction,
- deep water region,
- Baiyun Sag

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References(52)

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