Shale gas accumulation patterns in China

Zhang, Jinchuan; Li, Zhen; Wang, Dongsheng; Xu, Longfei; Li, Zhong‐Ming; Niu, Jialiang; Chen, Lei; Sun, Ying; Li, Qianchao; Yang, Zhenkun; Zhao, Xingxu; Wu, Xiangzhen; Lang, Yueheng

doi:10.1016/j.ngib.2023.01.004

Cited by 14 publications

(9 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, in the later stage of reservoir formation, magmatic activity can significantly inhibit the accumulation of shale gas. It can destroy the cap rock, allowing for the intrusive rock pipeline to become a path for shale gas to escape [113]. The intruding high-temperature magma will also bake the surrounding organic matter, resulting in carbonization or alteration of the mineral composition of the shale, reducing its adsorption capacity for gas [33,[114][115][116].…”

Section: The Influence Of Tectonics and Magmatic Activity On The Pres...mentioning

confidence: 99%

Comparative Study of the Characteristics of Lower Cambrian Marine Shale and Their Gas-Bearing Controlling Factors in the Middle and Lower Yangtze Areas, South China

Dong,

Zhou,

Deng

et al. 2023

Minerals

View full text Add to dashboard Cite

This study comparatively analyzed the geological, geochemical, reservoir, and gas-bearing characteristics of the lower Cambrian marine shale in the Middle and Lower Yangtze regions. The main factors controlling the gas-bearing properties of the shales were identified, and the favorable and unfavorable conditions for shale gas accumulation are discussed. The results show that the organic carbon contents and thermal evolution degree of the organic matter in the lower Cambrian marine shale in the Lower Yangtze area were higher than those generally found in the Middle Yangtze area. The brittle mineral composition of the Middle Yangtze area was typically low silicon and high calcium, whereas the Lower Yangtze area was characterized by high silicon and low calcium. The development of micropores in the Lower Yangtze area was poorer than in the Middle Yangtze area, with the organic pores being particularly underdeveloped. The adsorption capacity of shale in the Lower Yangtze area was obviously higher than in the Middle Yangtze area. It was considered that the organic carbon content, thermal evolution degree, and molecular structure of kerogen were the main factors that controlled the adsorption properties of the shale. In addition, the Lower Yangtze area suffered a stronger tectonic transformation and frequent magmatic activity, and the preservation conditions were inferior to those in the Middle Yangtze area.

show abstract

Section: The Influence Of Tectonics and Magmatic Activity On The Pres...mentioning

confidence: 99%

Comparative Study of the Characteristics of Lower Cambrian Marine Shale and Their Gas-Bearing Controlling Factors in the Middle and Lower Yangtze Areas, South China

Dong,

Zhou,

Deng

et al. 2023

Minerals

View full text Add to dashboard Cite

show abstract

“…In recent years, China has achieved remarkable progress in the exploration of shale gas resources, making it the third-largest producer of shale gas in the world [1,2]. In this process, scholars and the industry have not only continuously made breakthroughs in shale gas exploitation in major resource-bearing basins, including the Sichuan Basin, but also established a systematic geological understanding of shale gas enrichment and accumulation in China [3,4].…”

Section: Introductionmentioning

confidence: 99%

Differentiated Interval Structural Characteristics of Wufeng−Longmaxi Formation Deep Shale Gas Reservoirs in Western Chongqing Area, China: Experimental Investigation Based on Low-Field Nuclear Magnetic Resonance (NMR) and Fractal Modeling

Zhao,

Liu,

Wei

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

The study of deep shale gas (>3500 m) has become a new research hotspot in the field of shale gas research in China. In this study, 16 representative deep shale samples were selected from different layers of the Wufeng–Longmaxi Formation in the Z-3 well in the western Chongqing area to conduct low-field nuclear magnetic resonance (NMR) tests, field-emission scanning electron microscopy (FE-SEM) observation, and fractal modeling. By comparing the differences in pore structure and their influencing factors in representative samples from different layers, the particularities of high-quality reservoirs have been revealed. The results show that the Z-3 well shales mainly develop micropores and mesopores, with pore sizes of 1 nm–200 nm. The fractal dimensions of bound fluid pores D1 (1.6895–2.3821) and fractal dimension of movable fluid pores D2 (2.9914–2.9996) were obtained from T2 spectra and linear fitting, and the pores were divided into three sections based on the NMR fractal characteristics. TOC content was one of the major factors affecting the gas content in the study area. The shale samples in the bottom S1l1-1 sub-layer with a higher TOC content have larger porosity and permeability, leading to enhanced homogeneity of the pore structure and favorable conditions for shale gas adsorption. A comparative understanding of the particularities of pore structure and influencing factors in high-quality reservoirs with higher gas content will provide the scientific basis for further exploration and exploitation of the Wufeng–Longmaxi Formation deep shale reservoirs in the western Chongqing area.

show abstract

“…Shale gas has emerged as a key unconventional oil and gas resource in China due to the rapid increase in overall energy demand. The black shale of the Upper Ordovician Wufeng–Lower Silurian Longmaxi Formation in the Sichuan Basin and its periphery has become the main location of shale gas exploration and development in China as it has a high organic matter content, moderate burial depth, and high organic matter evolution. − Since 2009, Sinopec has had breakthroughs in the Fuling–Jiaoshiba region, and Petrochina has had breakthroughs in the Weiyuan–Changning block of Sichuan Province, thereby further promoting the commercial exploitation of shale gas in China. − …”

Section: Introductionmentioning

confidence: 99%

Lithofacies Types and Physical Characteristics of Organic-Rich Shale in the Wufeng–Longmaxi Formation, Xichang Basin, China

He,

Li,

Mou

et al. 2023

ACS Omega

View full text Add to dashboard Cite

The shale of the Upper Ordovician Wufeng Formation and the Lower Silurian Longmaxi Formation in the Xichang Basin is the main replacement horizon for the shale gas exploration being conducted in the Sichuan Province, except for the Sichuan Basin. The fine identification and classification of the types of shale facies are important for shale gas exploration and development evaluation. However, the lack of systematic experimental studies on rock physical characteristics and micro-pore structures leads to a lack of physical evidence for the comprehensive prediction of shale sweet spots. Therefore, the present study used different means, such as core observation, total organic carbon content (TOC), helium porosity measurement, X-ray diffraction analysis, and mechanical properties analysis, in combination with the analysis of the whole rock mineral composition and characteristics of shale, for the identification and classification of the lithofacies of the shale layer, the systematic petrology and hardness measurement of the shale samples with different lithofacies, and discussion of the dynamic and static elastic properties of the shale samples and the control factors. It was revealed that nine types of lithofacies existed in the Wufeng Formation the Long11 sub-member in the Xichang Basin, among which moderate organic carbon content–siliceous shale facies, moderate organic carbon content–mixed shale facies, and high-organic carbon content–siliceous shale facies were the best lithofacies with the optimum reservoir conditions, providing sufficient space for shale gas accumulation. The siliceous shale facies mainly developed organic pores and fractures, and the pore texture was excellent overall. The mixed shale facies mainly developed intergranular pores and mold pores, with a preference toward pore texture. The argillaceous shale facies mainly developed dissolution pores and interlayer fractures, and the pore texture was relatively poor. The geochemical characteristics of the organic-rich shale samples with TOC > 3.5% revealed that the sample was composed of microcrystalline quartz grains as the rock support framework, while the intergranular pores were located between the rigid quartz grains, which exhibited hard pores in the analysis of their mechanical properties. In the relatively organic-poor shale samples with TOC < 3.5%, the quartz source was mainly terrigenous clastic quartz, and the sample was composed of plastic clay minerals as the rock support skeleton, while the intergranular pores were located between argillaceous particles, which exhibited soft pores in the analysis of their mechanical properties. The difference in the rock fabric of the shale samples resulted in an ″initial increase followed by a decrease″ trend of velocity with quartz content, with the organic-rich shale samples exhibiting low velocity–porosity and velocity–organic matter content change rate, and the two kinds of rocks were easier to distinguish in the correlation diagram of the combined elastic parameters such as the P-wave impedanc...

show abstract

Shale gas accumulation patterns in China

Cited by 14 publications

References 15 publications

Comparative Study of the Characteristics of Lower Cambrian Marine Shale and Their Gas-Bearing Controlling Factors in the Middle and Lower Yangtze Areas, South China

Comparative Study of the Characteristics of Lower Cambrian Marine Shale and Their Gas-Bearing Controlling Factors in the Middle and Lower Yangtze Areas, South China

Differentiated Interval Structural Characteristics of Wufeng−Longmaxi Formation Deep Shale Gas Reservoirs in Western Chongqing Area, China: Experimental Investigation Based on Low-Field Nuclear Magnetic Resonance (NMR) and Fractal Modeling

Lithofacies Types and Physical Characteristics of Organic-Rich Shale in the Wufeng–Longmaxi Formation, Xichang Basin, China

Contact Info

Product

Resources

About