Multi-sphere coupling characteristics and gas-bearing controlling factors of calcareous shale reservoirs in the Yadu-Ziyun-Luodian Aulacogen under Early Carboniferous platform-basin transitional sedimentary system, South China
The Early Carboniferous Dawuba Formation within the Yadu-Ziyun-Luodian aulacogen (YZLA), southern China, represents a significant shale gas play formed within a dynamic platform-basin transitional sedimentary system influenced by multi-sphere coupling (the dynamic interaction of tectonic, climatic,...
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Frontiers Media S.A.
2025-05-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2025.1588481/full |
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| author | Kun Yuan Kun Yuan Kun Yuan Bing Feng Gangquan Li Zongan Xue Zongan Xue Zongan Xue Tuo Lin Tuo Lin Tuo Lin Xinxin Fang Xiangcan Sun Xiangcan Sun Xiangcan Sun Yinbo Xu Yinbo Xu Yinbo Xu Fengzan Zheng |
| author_facet | Kun Yuan Kun Yuan Kun Yuan Bing Feng Gangquan Li Zongan Xue Zongan Xue Zongan Xue Tuo Lin Tuo Lin Tuo Lin Xinxin Fang Xiangcan Sun Xiangcan Sun Xiangcan Sun Yinbo Xu Yinbo Xu Yinbo Xu Fengzan Zheng |
| author_sort | Kun Yuan |
| collection | DOAJ |
| description | The Early Carboniferous Dawuba Formation within the Yadu-Ziyun-Luodian aulacogen (YZLA), southern China, represents a significant shale gas play formed within a dynamic platform-basin transitional sedimentary system influenced by multi-sphere coupling (the dynamic interaction of tectonic, climatic, and oceanic spheres). This setting generated pronounced heterogeneities in lithology and gas content. Integrating field geological surveys and well data, this study comprehensively evaluates the mineralogy, geochemistry, structural features, and gas content of these shales to decipher the key factors controlling gas enrichment, particularly in this tectonically complex area. A crucial finding is the distinction between low-energy, “thick-bedded” deposits and higher-energy, “thin interbedded” sections characterized by frequent alternations of mudstone and argillaceous limestone (0.5–5 m single layers, mudstone:limestone ratio 1:1–1:2). Significantly, these thin interbedded sections demonstrate superior reservoir quality, exhibiting higher porosity (∼2.9%) and notably higher gas content (∼2.5 m3/t). We reveal that in the YZLA’s complex structural setting, shale gas content is primarily governed by preservation conditions dictated by the unique litho-mechanical properties of the interbedded strata, rather than traditional controlling factors like TOC abundance or matrix porosity. The frequent interlayering promotes stable micro-fractures, supported by clay-rich horizons and effectively sealed by compact limestone, thereby enhancing secondary storage capacity and permeability for free gas. Consequently, these thin interbedded sections represent the most favorable intervals for shale gas accumulation, identifying them as the prime targets for achieving Early Carboniferous shale gas breakthroughs in the YZLA. |
| format | Article |
| id | doaj-art-c061db32874a4df4b751a8636aa778ab |
| institution | OA Journals |
| issn | 2296-6463 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Frontiers Media S.A. |
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| series | Frontiers in Earth Science |
| spelling | doaj-art-c061db32874a4df4b751a8636aa778ab2025-08-20T01:51:35ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632025-05-011310.3389/feart.2025.15884811588481Multi-sphere coupling characteristics and gas-bearing controlling factors of calcareous shale reservoirs in the Yadu-Ziyun-Luodian Aulacogen under Early Carboniferous platform-basin transitional sedimentary system, South ChinaKun Yuan0Kun Yuan1Kun Yuan2Bing Feng3Gangquan Li4Zongan Xue5Zongan Xue6Zongan Xue7Tuo Lin8Tuo Lin9Tuo Lin10Xinxin Fang11Xiangcan Sun12Xiangcan Sun13Xiangcan Sun14Yinbo Xu15Yinbo Xu16Yinbo Xu17Fengzan Zheng18Oil and Gas Resources Survey, China Geological Survey, Beijing, ChinaThe Key Laboratory of Unconventional Oil and Gas Geology, China Geological Survey, Beijing, ChinaState Key Laboratory of Continental Shale Oil, Beijing, ChinaGuizhou Shale Gas Exploration and Development Co., Ltd., Zunyi, ChinaGuizhou Shale Gas Exploration and Development Co., Ltd., Zunyi, ChinaOil and Gas Resources Survey, China Geological Survey, Beijing, ChinaThe Key Laboratory of Unconventional Oil and Gas Geology, China Geological Survey, Beijing, ChinaState Key Laboratory of Continental Shale Oil, Beijing, ChinaOil and Gas Resources Survey, China Geological Survey, Beijing, ChinaThe Key Laboratory of Unconventional Oil and Gas Geology, China Geological Survey, Beijing, ChinaState Key Laboratory of Continental Shale Oil, Beijing, ChinaInstitute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, ChinaOil and Gas Resources Survey, China Geological Survey, Beijing, ChinaThe Key Laboratory of Unconventional Oil and Gas Geology, China Geological Survey, Beijing, ChinaState Key Laboratory of Continental Shale Oil, Beijing, ChinaOil and Gas Resources Survey, China Geological Survey, Beijing, ChinaThe Key Laboratory of Unconventional Oil and Gas Geology, China Geological Survey, Beijing, ChinaState Key Laboratory of Continental Shale Oil, Beijing, ChinaSchool of Energy Resources, China University of Geosciences, Beijing, ChinaThe Early Carboniferous Dawuba Formation within the Yadu-Ziyun-Luodian aulacogen (YZLA), southern China, represents a significant shale gas play formed within a dynamic platform-basin transitional sedimentary system influenced by multi-sphere coupling (the dynamic interaction of tectonic, climatic, and oceanic spheres). This setting generated pronounced heterogeneities in lithology and gas content. Integrating field geological surveys and well data, this study comprehensively evaluates the mineralogy, geochemistry, structural features, and gas content of these shales to decipher the key factors controlling gas enrichment, particularly in this tectonically complex area. A crucial finding is the distinction between low-energy, “thick-bedded” deposits and higher-energy, “thin interbedded” sections characterized by frequent alternations of mudstone and argillaceous limestone (0.5–5 m single layers, mudstone:limestone ratio 1:1–1:2). Significantly, these thin interbedded sections demonstrate superior reservoir quality, exhibiting higher porosity (∼2.9%) and notably higher gas content (∼2.5 m3/t). We reveal that in the YZLA’s complex structural setting, shale gas content is primarily governed by preservation conditions dictated by the unique litho-mechanical properties of the interbedded strata, rather than traditional controlling factors like TOC abundance or matrix porosity. The frequent interlayering promotes stable micro-fractures, supported by clay-rich horizons and effectively sealed by compact limestone, thereby enhancing secondary storage capacity and permeability for free gas. Consequently, these thin interbedded sections represent the most favorable intervals for shale gas accumulation, identifying them as the prime targets for achieving Early Carboniferous shale gas breakthroughs in the YZLA.https://www.frontiersin.org/articles/10.3389/feart.2025.1588481/fullSouthern ChinaCarboniferousshale gaslithologic interbeddingpreservation conditionsgas content |
| spellingShingle | Kun Yuan Kun Yuan Kun Yuan Bing Feng Gangquan Li Zongan Xue Zongan Xue Zongan Xue Tuo Lin Tuo Lin Tuo Lin Xinxin Fang Xiangcan Sun Xiangcan Sun Xiangcan Sun Yinbo Xu Yinbo Xu Yinbo Xu Fengzan Zheng Multi-sphere coupling characteristics and gas-bearing controlling factors of calcareous shale reservoirs in the Yadu-Ziyun-Luodian Aulacogen under Early Carboniferous platform-basin transitional sedimentary system, South China Frontiers in Earth Science Southern China Carboniferous shale gas lithologic interbedding preservation conditions gas content |
| title | Multi-sphere coupling characteristics and gas-bearing controlling factors of calcareous shale reservoirs in the Yadu-Ziyun-Luodian Aulacogen under Early Carboniferous platform-basin transitional sedimentary system, South China |
| title_full | Multi-sphere coupling characteristics and gas-bearing controlling factors of calcareous shale reservoirs in the Yadu-Ziyun-Luodian Aulacogen under Early Carboniferous platform-basin transitional sedimentary system, South China |
| title_fullStr | Multi-sphere coupling characteristics and gas-bearing controlling factors of calcareous shale reservoirs in the Yadu-Ziyun-Luodian Aulacogen under Early Carboniferous platform-basin transitional sedimentary system, South China |
| title_full_unstemmed | Multi-sphere coupling characteristics and gas-bearing controlling factors of calcareous shale reservoirs in the Yadu-Ziyun-Luodian Aulacogen under Early Carboniferous platform-basin transitional sedimentary system, South China |
| title_short | Multi-sphere coupling characteristics and gas-bearing controlling factors of calcareous shale reservoirs in the Yadu-Ziyun-Luodian Aulacogen under Early Carboniferous platform-basin transitional sedimentary system, South China |
| title_sort | multi sphere coupling characteristics and gas bearing controlling factors of calcareous shale reservoirs in the yadu ziyun luodian aulacogen under early carboniferous platform basin transitional sedimentary system south china |
| topic | Southern China Carboniferous shale gas lithologic interbedding preservation conditions gas content |
| url | https://www.frontiersin.org/articles/10.3389/feart.2025.1588481/full |
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