Potential on joint development of three-gas reservoirs in the Qiongdongnan Basin

Shiguo Wu; Jin Sun; Qingping Li; Yongsheng Ma; Thomas Lüdmann

doi:10.59717/j.xinn-geo.2024.100065

The Innovation Geoscience > 2024 Vol. 2 > No. 2 > 100065

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Potential on joint development of three-gas reservoirs in the Qiongdongnan Basin

1.
Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China
2.
School of Earth Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
3.
State Key Laboratory of Natural Gas Hydrate, Beijing 100028, China
4.
China Petrochemical Corporation, Beijing 100728, China
5.
Institute for Geology, CEN, University of Hamburg, Hamburg 20146, Germany

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Corresponding authors: swu@idsse.ac.cn (S.W.); sunjin@idsse.ac.cn (J.S.)
Received Date: September 11, 2023

Accepted Date: March 29, 2024

Published Online: April 11, 2024

The Innovation Geoscience 2(2), https://doi.org/10.59717/j.xinn-geo.2024.100065 | Cite this article

GRAPHICAL ABSTRACT

GRAPHICAL ABSTRACT

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PUBLIC SUMMARY

PUBLIC SUMMARY
1. Gas hydrate, shallow gas and deep gas reservoirs are coexistent in the Qiongdongnan basin.
  
  Gas chimney controls the spatial distribution of gas hydrates.
  
  Multilateral well and dual production string are required for three-gas joint development.

ABSTRACT

ABSTRACT

Gas hydrates are typically found in the fine-grained sediments with low abundance and strong heterogeneity in the northern South China Sea. To date, although numerous gas hydrate reservoirs have been discovered, commercial exploitation remains highly challenging. Previous studies show that the Qiongdongnan Basin exhibits coexistence of gas hydrates, shallow gas and deep gas reservoirs. The hydrate-bound gases are a mixture of thermogenic and biogenic gas, mainly sourced from the granite buried hill reservoir, central canyon channel of the Lingshui Depression and the Yacheng Formation. In this study, we described a new development concept termed “Three-gas Joint Development” (TJD), to elucidate the simultaneous exploitation of these three gas reservoirs. Based on the distribution of three-gas reservoirs, three different TJD plans are proposed. If the relative distance between three-gas reservoirs does not exceeds the extension limit, a single production platform is capable of exploiting all three-gas reservoirs. A vertical well is suggested if the deep gas reservoir lies directly below the gas hydrates and shallow gas. Otherwise, multilateral well should be used to exploit different gas reservoirs with various branches in a main wellbore. However, several key issues remain unsolved. Numerical simulation of TJD should be conducted to evaluate interlayer interference and productivity. Efficient sand control and wellbore stability techniques, such as frac-packing and high-performance drilling fluids, are recommended when drilling unconsolidated sediments. Once these key technologies are overcome, TJD can provide a feasible approach for the commercial development of gas hydrates.

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Wu S., Sun J., Li Q., et al., (2024). Potential on joint development of three-gas reservoirs in the Qiongdongnan Basin. The Innovation Geoscience 2(2): 100065. https://doi.org/10.59717/j.xinn-geo.2024.100065

Wu S., Sun J., Li Q., et al., (2024). Potential on joint development of three-gas reservoirs in the Qiongdongnan Basin. The Innovation Geoscience 2(2): 100065. https://doi.org/10.59717/j.xinn-geo.2024.100065

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