Shale Gas as a Pro-Environmental Source of Energy

Kamiński, Michał; Muthuraman, Mayilvaganan; Łagocka, Agnieszka; Cholewiński, Maciej

doi:10.15199/9.2017.4.2

Cited by 1 publication

(1 citation statement)

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“…Unconventional oil and gas resources have great potential as strategic replacements for current storage and production, they are expected to change the global energy structure, allowing China to achieve its "double carbon" goal through energy transformation (Gracceva and Zeniewski, 2013;Shuen et al, 2014;Kamiński et al, 2017). Many wells in the Yuanba area of northeastern Sichuan have obtained medium to high-yield industrial gas flow in the Da'anzhai member of the Jurassic Ziliujing Formation, which proves the good continental shale gas accumulation conditions and exploration potential in northeastern Sichuan (Jiao et al, 2020;Zou et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Clay mineral transformation mechanism modelling of shale reservoir in Da’anzhai Member, Sichuan Basin, Southern China

Yang,

Lu,

et al. 2023

Front. Earth Sci.

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Shale reservoirs often undergo intense clay mineral transformation, which plays a crucial role in the formation and evolution of pores. The reservoir lithofacies types of Da’anzhai Member in the Sichuan Basin are complex, the heterogeneity is strong, and the transformation mechanism of clay minerals is unclear, limiting the understanding of reservoir diagenesis and reservoir formation mechanism. In this study, we selected the typical shale reservoir in the Da’anzhai Member of the eastern Sichuan Basin and innovatively introduced the multiphase fluid-chemical-thermal multi-field coupled numerical simulation technique to focus on the dissolution, precipitation and transformation laws of diagenetic minerals in the shale reservoir. We calculated the transformation of diagenetic minerals and their physical response under different temperatures, pressure and fluid conditions and identified the main controlling factors of mineral transformation in shale reservoirs in the study area. The results show that the transformation of smectite to illite in the Da’anzhai Member is a complex physicochemical process influenced by various factors such as temperature, pressure, fluid, and lithology. The increase in temperature can promote illitization until the critical temperature of 110°C–115°C, below which the conversion rate of smectite to illite increases as the temperature increases. However, when it is higher than the critical temperature, the degree of illitization decreases. In specific K-rich fluids, organic acids significantly affect the conversion of clay minerals in the Da’anzhai Member of the formation. The acidic fluid promotes the dissolution of minerals such as K-feldspar and releases K+, thus provides the material basis for illitization. The research results provide theoretical support for the diagenetic and formation mechanism of the shale reservoir in the Da’anzhai Member of the Sichuan Basin and even for the efficient exploration and development of shale gas.

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