A study of reservoir architecture of Dengying formation in Gsoshiti-Moxi area, Sichuan Basin

HU Xiuquan; LU Hongjiang; YI Chi; LI Jianghan; CHEN Keyong; LU Jie; XIAO Chenjing

doi:10.11932/karst20220601

2022 No. 6

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Article navigation > Carsologica Sinica > 2022 > 41(6): 847-859

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HU Xiuquan, LU Hongjiang, YI Chi, LI Jianghan, CHEN Keyong, LU Jie, XIAO Chenjing. A study of reservoir architecture of Dengying formation in Gsoshiti-Moxi area, Sichuan Basin[J]. Carsologica Sinica, 2022, 41(6): 847-859. doi: 10.11932/karst20220601

Citation:

HU Xiuquan, LU Hongjiang, YI Chi, LI Jianghan, CHEN Keyong, LU Jie, XIAO Chenjing. A study of reservoir architecture of Dengying formation in Gsoshiti-Moxi area, Sichuan Basin[J]. Carsologica Sinica, 2022, 41(6): 847-859. doi: 10.11932/karst20220601

A study of reservoir architecture of Dengying formation in Gsoshiti-Moxi area, Sichuan Basin

1.
College of Energy Resources, Chengdu University of Technology, Chengdu, Sichuan 610059, China
2.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China
3.
Exploration and Development Research Institute, PetroChina Southwest Oil & Gas Field Company, Chengdu, Sichuan 610041, China
4.
Sinopec Northwest Oilfield Company, Urumqi, Xinjiang 830011, China

More Information

Corresponding author: LU Hongjiang, 719436941@qq.com

Received Date: 03 December 2021

Publish Date: 25 December 2022

Abstract

Abstract

There is a largest complete carbonate gas reservoir so far found in the mid of Sichuan Gaoshiti-Moxi area. Influenced by multi-period tectonic movement, this reservoir presents complex characteristics of diagenesis and reservoir formation. Combined with the field, lithologic, logging and production dynamic, the reservoir architecture can be divided into four types. The FMI of layered cavitation configuration shows layered distribution with dark spots on light background; the FMI of grape-lacelike cavitation configuration shows sporadic distribution of dark patches on light background; the FMI of the inter-breccia cavitation configuration shows clutter distribution of dark patches and short line images; and the FMI of cavitation configuration combined with crevices shows distribution of dark sinusoidal line images and patches on light background. The layered cavitation configuration is supposed to be formed by the dissolution of external acidic fluids during the burial period. The inter-breccia cavitation configuration and cavitation configuration combined with crevices are supposed to be formed by supergene karstification, and the grape-lacelike cavitation configuration is presumed to be a secondary cause—When the sea level rises, seawater fills the cracks and holes, forming grape lace cement. Different reservoir configurations are also different in conventional logging characteristics. The establishment of a corresponding discriminant model by multiple logging series can, to a certain extent, distinguish these four types of reservoir configurations.
In this study, the single well logging, the variance function analysis, and the sequential indicator simulation method based on pixel are adopted to carry out the reservoir structure modeling of Dengying formation under the condition of seismic inversion constraint. The distribution law of reservoir configuration in No.4 segment of Dengying Formation in Gaoshiti-Moxi area is discussed. The method of reservoir structure analysis that enriches the methods and studies of carbonate rocks has a wide range of application prospects. The results of drilling gas test show that the thickness of layered cavitation configuration has a certain control effect on oil and gas productivity, and the areas where the layered cavitation configuration is relatively developed are of great exploration potential.
- reservoir modeling /
- Dengying formation /
- reservoir architecture /
- discriminant model /
- Gsoshiti-Moxi area

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References

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