Characteristics of ultra-deep shale reservoir of marine-continental transitional facies: a case study of lower member of Upper Permian Longtan Formation in well Y4, Puguang Gas Field, northeastern Sichuan Basin

LI Jin; WANG Xuejun; ZHOU Kai; WANG Yunsuo; LI Ningchao; WU Ying; WANG Meige

doi:10.11781/sysydz202201071

Volume 44 Issue 1

Jan. 2022

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Yang Caihong, Zeng Guangdong, Li Shangqing, Liang Ruobing. Fault development characteristics and hydrocarbon accumulation in Pingbei area of Xihu Sag, East China Sea[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2014, 36(1): 64-69. doi: 10.11781/sysydz201401064

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LI Jin, WANG Xuejun, ZHOU Kai, WANG Yunsuo, LI Ningchao, WU Ying, WANG Meige. Characteristics of ultra-deep shale reservoir of marine-continental transitional facies: a case study of lower member of Upper Permian Longtan Formation in well Y4, Puguang Gas Field, northeastern Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2022, 44(1): 71-84. doi: 10.11781/sysydz202201071

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Characteristics of ultra-deep shale reservoir of marine-continental transitional facies: a case study of lower member of Upper Permian Longtan Formation in well Y4, Puguang Gas Field, northeastern Sichuan Basin

doi: 10.11781/sysydz202201071

1.
Exploration and Development Research Institute of SINOPEC Zhongyuan Oilfield, Puyang, Henan 457000, China
2.
Exploration Management Department of SINOPEC Zhongyuan Oilfield, Puyang, Henan 457000, China
3.
Geophysical Exploration Institute of SINOPEC Zhongyuan Oilfield, Puyang, Henan 457000, China

Received Date: 2021-02-02
Rev Recd Date: 2021-12-28
Publish Date: 2022-01-28

Abstract

Abstract

In order to explore the characteristics of marine-continental transitional shale reservoir under overburden conditions, studies of organic geochemistry, mineral composition, parameters of pore structure and physical properties of shale in well Y4 of the Upper Permian Longtan Formation in the Puguang exploration area of northeastern Sichuan Basin were carried out. The shale of the Longtan Formation is characterized by high abundance of organic matter (ranging from 3.77% to 10.72%), humic and sapropelic organic matter (kerogen type of Ⅱ₂ to Ⅲ) and post stage of maturation (%R_o values ranging from 3.82% to 3.97%). The average pore volume, specific surface area and porosity of shale are 0.047 mL/g, 31.8 m²/g and 6.64%, respectively. Reservoir space is mainly composed of organic pores, interlayer pores of clay minerals, dissolution pores of brittle minerals and micro fractures. The main pore structure is parallel plate-shaped pores and open tubular pores at both ends. The porosity of shale is positively correlated with the contents of TOC, pyrite and quartz in deep-water lagoon environment, which indicated that the original mineral composition and structure were controlled by anoxic reduction and stable water environment. Meanwhile, the effective complexation of rigid mineral particles with organic matter and clay minerals provided necessary conditions for the preservation of organic pores. Reservoir network is consisted of flat organic macropores affected by flattening transformation, densely-developed organic pores, intergranular pores and fractures of brittle minerals, and finally formed ultra-deep shale reservoir deposited in deep-water lagoon microfacies.
- ultra-deep transitional shale,
- reservoir space,
- macro-pores of flat organic matter,
- flattening transformation,
- Longtan Formation,
- Upper Permian,
- Puguang area,
- northeastern Sichuan Basin

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References

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