A novel model to determine gas content in naturally fractured shale

Jing, Guicheng; Chen, Zhangxin; Hui, Gang

doi:10.1016/j.fuel.2021.121714

Cited by 13 publications

(2 citation statements)

References 11 publications

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“…As an unconventional oil and gas resource integrating source and reservoir, shale gas accounts for an increasing proportion in the international energy structure and has become a hot spot in the field of global oil and gas exploration. − The shale gas resource potential of the Upper Ordovician Wufeng formation (O 3 w) and Lower Silurian Longmaxi formation (S 1 l) in southern China is huge, and it is an important base for shale gas exploration and development in China. , For unconventional oil and gas resources such as shale gas, shale organic matter abundance [total organic carbon (TOC)] controls the hydrocarbon generation and storage capacity of shale, plays a decisive role in shale gas content, and is an important indicator to evaluate whether shale has commercial exploitation value. − Therefore, the research on the enrichment mechanism of shale organic matter is the leading work of the shale gas enrichment mechanism, resource evaluation, and favorable area optimization.…”

Section: Introductionmentioning

confidence: 99%

Constraints of Sedimentary Environment on Shale Organic Matter Enrichment: Insights from Elemental Geochemistry and Multiple Factor Analysis

Shao,

Xu,

Jiang

et al. 2024

ACS Omega

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The organic-rich shale of the Wufeng−Longmaxi formation is an important section for shale gas exploration. The traditional univariate or bivariate analysis causes researchers to have great controversy about its enrichment mechanism. This study explores the combination of multiple factor analysis (MFA) and element geochemistry to calculate the contribution rate of a paleoenvironment to organic matter enrichment and clarify the main controlling factors of organic matter enrichment. Research has shown that there is generally high productivity from the Wufeng (O 3 w)−Longmaxi formation (S 1 l) deposition. The degree of terrigenous clastic input and weathering during the period of the O 3 w is relatively low, and sedimentary water restriction is strong, mainly developing an anoxic−dysoxic sedimentary environment. During the deposition of S 1 l 1 , the input intensity and weathering of terrigenous debris were slightly enhanced, and the increase of the water column led to the development of an anoxic environment at the bottom of the water layer. During the S 1 l 2+3 period, the degree of terrigenous debris and weathering is the largest, and the high oxygen content of the water column is mainly a normal oxic environment. An MFA calculation shows that the paleoproductivity and paleoredox environment of the organic-rich shale section have the highest contribution rate of about 59.57% to the enrichment of organic matter, which is higher than that of paleoclimate conditions and terrigenous clastic input, indicating that the enrichment of organic matter is mainly controlled by paleoproductivity and the preservation environment. This study provides a basis for the application of MFA in element geochemistry and can serve as a model for other studies.

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Section: Introductionmentioning

confidence: 99%

Constraints of Sedimentary Environment on Shale Organic Matter Enrichment: Insights from Elemental Geochemistry and Multiple Factor Analysis

Shao,

Xu,

Jiang

et al. 2024

ACS Omega

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“…The evaluation objects in regard to the shale gas-bearing property can be classified into three types, namely, total gas content evaluation, evaluation of the adsorbed gas or free gas content, and gas saturation evaluation 10 , 11 . The evaluation methods for the shale gas-bearing property can be classified into three types, including the experiment/field testing method 12 – 16 , geophysical method 17 – 19 , and mathematical statistical method 20 , 21 . For example, Chen et al 18 evaluated shale gas-bearing properties and predicted the spatial distribution based on well log interpretation and seismic multiple-attribute analysis.…”

Section: Introductionmentioning

confidence: 99%

Application of mathematical statistics to shale gas-bearing property evaluation and main controlling factor analysis

Pang

et al. 2022

Sci Rep

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Gas-bearing property evaluation and main controlling factor analysis have remained a concern in shale gas research. The application of principal component analysis, an important mathematical statistical method, in gas-bearing property evaluation and main controlling factor analysis of the Longmaxi shale in the Weirong area, Sichuan Basin, was examined. The Longmaxi shale exhibits high heterogeneity, manifested in the organic matter abundance, mineral composition, and pore structure. Seven geological factors, including the temperature, pressure, TOC content, clay content, brittle mineral content, pore volume, and specific surface area (SSA), were selected in principal component analysis. Four principal components with geological significance, such as mineral composition, formation condition, pore structure, and organic matter abundance, were extracted through principal component analysis, and further constituted a comprehensive factor. Shale gas-bearing properties were evaluated according to the score of the comprehensive factor. The Longmaxi shale could be identified as exhibiting good, medium, and poor gas-bearing properties based on the comprehensive factor scores of these samples. According to each geological factor’s contribution to the comprehensive factor, combined with geological analysis, it could be considered that gas-bearing properties are primarily controlled by pore volume, SSA, and clay content, followed by TOC content, brittle mineral content, temperature and pressure.

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Gas content evaluation in deep coal seam with an improved method and its geological controls

Li,

Chen,

Tang

et al. 2024

Front. Earth Sci.

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A novel model to determine gas content in naturally fractured shale

Cited by 13 publications

References 11 publications

Constraints of Sedimentary Environment on Shale Organic Matter Enrichment: Insights from Elemental Geochemistry and Multiple Factor Analysis

Constraints of Sedimentary Environment on Shale Organic Matter Enrichment: Insights from Elemental Geochemistry and Multiple Factor Analysis

Application of mathematical statistics to shale gas-bearing property evaluation and main controlling factor analysis

Gas content evaluation in deep coal seam with an improved method and its geological controls

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