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General depositional features of the carbonate platform gas reservoir of the Lower Triassic Jialingjiang Formation in the Sichuan Basin of southwest China: Moxi gas field of the central basin

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Abstract

The Lower Triassic Jialingjiang Formation gas reservoir in Sichuan Basin of southwest China is a representative carbonate platform reservoir. However, it has not been well studied due to relatively less production in comparison with the reservoir in the well-known underlying Upper Permian Changxing and Lower Triassic Feixianguan formations. Thus, to provide supplement to the hot study of carbonate platform reservoirs in the Sichuan Basin, the authors describe the general depositional features of the carbonate platform gas reservoir of the Jialingjiang Formation based on a case study of the representative second member of the formation (termed as Jia 2) in the Moxi gas field of the central basin. The features mainly include depositional setting, lithology, depositional structure, depositional sequence and reservoir space. These results lead to a conclusion that the Jialingjiang Formation reservoir (the second member in particular) is not of a tidal flat deposition in an intertidal (to supratidal) environment as previously suggested but of restricted and evaporative carbonate platform deposition in a subtidal environment. The tidal flat-like (i.e., platform flat) facies occur only in the Jia 22-B layer. Moreover, the restricted–evaporative carbonate platform facies can be further divided into 5 subfacies and 23 microfacies, of which the facies of grain shoal and dolomitic flat are relatively favorable for the development of reservoirs. Their depositional model, distribution and evolution were further tentatively suggested. The facies are subject to paleotomography and sea level variations. These results also have general implications for the carbonate platform reservoirs elsewhere.

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Acknowledgments

We thank the anonymous reviewers for their valuable suggestions and kind help in improving the quality of the manuscript. PetroChina Southwestern Oil and Gas Field Company is thanked for permission to publish this paper. Yuhong Luo, Derong Liu, Yihua Zhao and Xiaolan Zhang from Central Branch of the company are thanked for warm help in sample collection and technical discussion to improve the quality of this paper. This work is supported by PetroChina Youth Innovation Foundation (Grant No. 06E1018) and Key Subject Construction Project of Sichuan Province, China (Grant No. SZD 0414).

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Correspondence to Xiucheng Tan.

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Tan, X., Li, L., Liu, H. et al. General depositional features of the carbonate platform gas reservoir of the Lower Triassic Jialingjiang Formation in the Sichuan Basin of southwest China: Moxi gas field of the central basin. Carbonates Evaporites 26, 339–350 (2011). https://doi.org/10.1007/s13146-011-0070-5

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