Classification of shale lithofacies from Ordovician Wufeng Formation to first section of first member of Silurian Longmaxi Formation, western Changning area, Sichuan Basin, and its significance

LIAO Chongjie; CHEN Lei; ZHENG Jian; CHEN Yana; JIN Zhimin; LI Minglong; CHEN Xin; TAN Xiucheng

doi:10.11781/sysydz2022061037

Volume 44 Issue 6

Nov. 2022

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LIAO Chongjie, CHEN Lei, ZHENG Jian, CHEN Yana, JIN Zhimin, LI Minglong, CHEN Xin, TAN Xiucheng. Classification of shale lithofacies from Ordovician Wufeng Formation to first section of first member of Silurian Longmaxi Formation, western Changning area, Sichuan Basin, and its significance[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2022, 44(6): 1037-1047. doi: 10.11781/sysydz2022061037

Citation:

LIAO Chongjie, CHEN Lei, ZHENG Jian, CHEN Yana, JIN Zhimin, LI Minglong, CHEN Xin, TAN Xiucheng. Classification of shale lithofacies from Ordovician Wufeng Formation to first section of first member of Silurian Longmaxi Formation, western Changning area, Sichuan Basin, and its significance[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2022, 44(6): 1037-1047. doi: 10.11781/sysydz2022061037

Citation:

LIAO Chongjie, CHEN Lei, ZHENG Jian, CHEN Yana, JIN Zhimin, LI Minglong, CHEN Xin, TAN Xiucheng. Classification of shale lithofacies from Ordovician Wufeng Formation to first section of first member of Silurian Longmaxi Formation, western Changning area, Sichuan Basin, and its significance[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2022, 44(6): 1037-1047. doi: 10.11781/sysydz2022061037

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Classification of shale lithofacies from Ordovician Wufeng Formation to first section of first member of Silurian Longmaxi Formation, western Changning area, Sichuan Basin, and its significance

doi: 10.11781/sysydz2022061037

LIAO Chongjie^{1, 2, 3
,},
CHEN Lei^{1, 2, 3
,
,},
ZHENG Jian⁴,
CHEN Yana⁵,
JIN Zhimin⁶,
LI Minglong^{1, 2, 3},
CHEN Xin^{1, 2, 3},
TAN Xiucheng^{1, 2, 3}

1.
Sichuan Provincial Key Laboratory of Gas Geology, Chengdu, Sichuan 610500, China
2.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
3.
Research Branch of Southwest Petroleum University, Key Laboratory of Carbonate Reservoirs, CNPC, Chengdu, Sichuan 610500, China
4.
Sichuan Changning Natural Gas Development Co. Ltd., Chengdu, Sichuan 610051, China
5.
PetroChina Hangzhou Research Institute of Geology, Hangzhou, Zhejiang 310023, China
6.
Exploration and Development Research Institute, PetroChina Southwest Oil and Gasfield Company, Chengdu, Sichuan 610041, China

Received Date: 2022-05-12
Rev Recd Date: 2022-09-26
Publish Date: 2022-11-28

Abstract

Abstract

Shale gas exploration has been successfully carried out in the Upper Ordovician Wufeng Formation to the Lower Silurian Longmaxi Formation of the Changning area of Sichuan Basin. To clarify the lithofacies differences, vertical and horizontal distribution signatures, reservoir development characteristics and influencing factors in the western part of Changning area, based on core X-ray diffraction test, scanning electron microscopic observation and various analytical test data, the shale lithofacies of the Wufeng Formation (O₃w) to the first section of the first member of Longmaxi Formation (S₁l₁¹) were studied in detail. Seven lithofacies in the study area were recognized including siliceous shale, mixed siliceous shale, carbonate-rich siliceous shale, clay-rich siliceous shale, mixed shale, argillaceous/siliceous mixed shale and calcareous/siliceous shale. The siliceous shale facies developed at the bottom of S₁l₁¹ is the best shale lithofacies in the study area since its TOC content, porosity and gas-bearing capacity are all higher than those of others. The mixed siliceous shale, carbonate-rich siliceous shale, calcareous/siliceous mixed shale and argillaceous/siliceous mixed shale in O₃w and the upper S₁l₁¹ are slightly poorer than siliceous shale in terms of reservoir conditions, which are the sub-optimal lithofacies in the study area. Comprehensive analyses showed that the formation of dominant shale lithofacies reservoirs in O₃w and S₁l₁¹ may be controlled by two factors. One is the sedimentary environment rich in oxygen in the upper layer and hypoxic and reducing in the lower layer, which provided a large amount of organic-rich siliceous minerals. Secondly, abundant organic-rich siliceous minerals provided excellent pore types for reservoirs during late diagenesis. The results will provide lithographic support for the studies of shale gas enrichment zones in the western Changning area, and are conducive to the further exploration of marine shale gas in O₃w and S₁l₁¹ in the Sichuan Basin.
- shale lithofacies,
- reservoir characteristics,
- controlling factors,
- Longmaxi Formation,
- Changning area,
- Sichuan Basin

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References(32)

References

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Classification of shale lithofacies from Ordovician Wufeng Formation to first section of first member of Silurian Longmaxi Formation, western Changning area, Sichuan Basin, and its significance

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Classification of shale lithofacies from Ordovician Wufeng Formation to first section of first member of Silurian Longmaxi Formation, western Changning area, Sichuan Basin, and its significance

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