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Characteristics and Forming Processes of Reef-Shoal Reservoir in Changhsing Formation of the Eastern Sichuan Basin in Dianjiang, China

  • Research Article-Earth Sciences
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Abstract

The Upper Permian Changhsing Formation is one of the most important gas-bearing formations in the Eastern Sichuan Basin. Nonetheless, the primary factors controlling the reef-shoal gas reservoirs of different regions are diverse. Clarifying the controlling factors for the formation of intra-platform reef-shoal reservoirs will promote the exploration and development process of the Changhsing Formation. By using outcrop data, core observation, thin section identification, scanning electron microscope analysis, physical property study, and logging interpretation, this paper analyse the characteristics and factors controlling the reef-shoal reservoir in Dianjiang area of the Eastern Sichuan Basin. The results show that the reef cap and reef base microfacies fine-to-medium crystalline dolomite reservoir have the best physical properties, and the reservoir spaces are primarily composed of intercrystalline pores, intercrystalline solution pores, karst caves, and fractures. The main lithology of reservoir formation is reef-shoal facies. The results for the carbon and oxygen isotopes show that dolomites of different particle sizes are formed in three environments. Affected by regression in the late Changhsingian Age, the reef-shoal of the Changhsing Formation were subaerially exposed to meteoric water diagenesis environments, resulting in the highly dispersed particles in rocks that formed a honeycomb karst system, which greatly improved the physical properties of the reservoirs. After reflux dolomitization, the honeycomb karst system was well preserved due to strong resistance to pressure and dissolution of dolomite. Therefore, dolomitization in the Changhsing formation contributed to reservoir porosity. Later, tectonic fracturing has adjusted and modified the reef-shoal reservoir. In summary, penecontemporaneous karstification was the key to the formation of the reef-shoal reservoir.

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Acknowledgements

We would like to thank PetroChina Southwest Oil and Gas Field Company for providing data and allowing the publication of this article. Thanks to two anonymous reviewers and subject editor M.N. Çağatay for their suggestions.

Funding

This study was financially supported by the National Natural Science Foundation of China (Grant No. 41872137).

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Authors and Affiliations

  1. College of Energy Resources and State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, No.1 East 3 road ErXian brige ChengHua distrct, Chengdu, 610059, China

    Wei Luo, Zejin Shi, Yamin Tian & Xiuquan Hu

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  1. Wei Luo
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Correspondence to Zejin Shi.

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Luo, W., Shi, Z., Tian, Y. et al. Characteristics and Forming Processes of Reef-Shoal Reservoir in Changhsing Formation of the Eastern Sichuan Basin in Dianjiang, China. Arab J Sci Eng 47, 725–737 (2022). https://doi.org/10.1007/s13369-021-05863-6

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