Geology and shale gas resource potentials in the Sichuan Basin, China

Jiang, Shu; Peng, Yongmin; Gao, Bo; Zhang, Jinchuan; Cai, Dongsheng; Gang, Xue; Bao, Shujing; Zhao, Xu; Tang, Xianglu; Dahdah, Nick

doi:10.1177/0144598716657442

Cited by 32 publications

(15 citation statements)

References 16 publications

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“…The analyzed sedimentary environment demonstrates that the Shiniulan, Xintan, Longmaxi-Wufeng and Baota formations are situated under a carbonate platform, shallow shelf, deep shelf and carbonate platform facies, respectively. All these sedimentary sequences are consistent with the depositional environments of the Upper Ordovician-Lower Silurian in the Sichuan basin (Nie et al, 2012;Jiang et al, 2016).…”

Section: Sedimentary Environment and Bulk Mineralogysupporting

confidence: 79%

Shale Gas Reservoir Evaluation by Geophysical Measurements: A Case Study of the Upper Ordovician–Lower Silurian in the Fenggang Block, Northern Guizhou Province

Xia

Guo

et al. 2021

Acta Geologica Sinica (Eng)

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With the aid of geophysical measurements, including seventeen two‐dimensional (2D) seismic lines and the well logging curves of well FGY1, the structure and reservoir characteristics of the Upper Ordovician–Lower Silurian strata in the Fenggang block, northern Guizhou Province, were analyzed thoroughly to identify desert areas and favorable intervals. The results show that Longmaxi‐Wufeng is the most prospect‐rich formation, consisting of a thick succession of overmature black shale, this formation remaining partially in the Suiyang, Fenggang and Jianchaxi synclines. The Longmaxi‐Wufeng shale, especially the lower member, was deposited in a reducing low‐energy environment with relatively high U content and a low Th/U value. In this shale, the organic matter type (sapropelic and humic‐sapropelic), total organic carbon (TOC) content, gas content, gas adsorption capacity, vitrinite reflectance and brittle mineral content are profitable for shale gas preservation and development. The fractures of this shale were closed because of its high overburden pressure. The gas adsorption capacity of this shale increases with increasing TOC content and Ro. In the Longmaxi‐Wufeng Formation at well FGY1, the most favorable intervals are in the depth ranges of 2312.4–2325.1 m and 2325.8–2331.1 m.

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Section: Sedimentary Environment and Bulk Mineralogysupporting

confidence: 79%

Shale Gas Reservoir Evaluation by Geophysical Measurements: A Case Study of the Upper Ordovician–Lower Silurian in the Fenggang Block, Northern Guizhou Province

Xia

Guo

et al. 2021

Acta Geologica Sinica (Eng)

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“…2). The Lower Silurian shale, widely developed in the Upper Yangtze Platform, has recently been selected as the main target for shale gas exploration and development (Chen et al, 2011Tan et al, 2014;Ji et al, 2015Ji et al, , 2016Jiang et al, 2016;Liu et al, 2016;Tang et al, 2016;Yang et al, 2016a,b,c). The Silurian shales occur in some strongly uplifted areas as outcrops, which indicates that the shales have experienced a complicated tectonic evolution, then influencing the gas content (Hao et al, 2013).…”

Section: Geological Setting and Samplesmentioning

confidence: 99%

Quantitative characterization of micropore structure for organic-rich Lower Silurian shale in the Upper Yangtze Platform, South China: Implications for shale gas adsorption capacity

Chen

Jiang

Liu

et al. 2017

Adv. Geo-Energ. Res.

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The pores in shales are mainly of nanometer-scale, and their pore size distribution is very important for shale gas storage and adsorption capacity, especially micropores having widths less than 2 nm, which contribute to the main occurrence space for gas adsorption. This study is focused on the organic-rich Lower Silurian black shale from four wells in the Upper Yangtze Platform, and their total organic carbon (TOC), mineralogical composition and micropore characterization were investigated. Low pressure CO2 adsorption measurement was conducted at 273.15 K in the relative pressure range of 0.0001-0.03, and the micropore structure was characterized by Dubinin-Radushkevich (DR) equation and density functional theory (DFT) method and then the relationship between micropore structure and shale gas adsorption capacity was discussed. The results indicated that (1) The Lower Silurian shale have high TOC content in the range of 0.92-4.96%, high quartz content in the range of 30.6-69.5%, and high clays content in the range of 24.1-51.2%. The TOC content shows a strong positive relationship with the quartz content which suggests that the quartz is mainly biogenic in origin. (2) The micropore volume varies from 0.12 cm 3 /100 g to 0.44 cm 3 /100 g and micropore surface area varies from 4.97 m 2 /g to 17.94 m 2 /g. Both of them increase with increasing TOC content, indicating TOC is the key factor to control the micropore structure of the Lower Silurian shale. (3) Low pressure CO2 adsorption measurement provides the most suitable detection range (0.3-1.5 nm) and has high reliability and accuracy for micropore structure characterization. (4) The TOC content is the key factor to control gas adsorption capacity of the Lower Silurian shale in the Upper Yangtze Platform.

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“…Organic-rich marine shale is widely distributed in the Lower Palaeozoic strata of the Upper Yangtze region in southern China (Dong et al., 2010; Jiang et al., 2016; Liang et al., 2008; Nie and Zhang, 2012; Tuo et al., 2016; Wang et al., 2009; Zhang et al., 2008; Zou et al., 2010). The Lower Palaeozoic shales in the Sichuan Basin have significant gas-bearing thicknesses, high thermal maturity, strong hydrocarbon generation capacity, and abundant oil and gas shows, and they are favourable for shale gas exploration.…”

Section: Introductionmentioning

confidence: 99%

Multiple controlling factors of lower Palaeozoic organic-rich marine shales in the Sichuan Basin, China: Evidence from minerals and trace elements

Tuo

Zhang

et al. 2017

Energy Exploration & Exploitation

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Lower Palaeozoic organic-rich shales are widely distributed in southern China. In this study, the organic matter contents of Lower Cambrian, Upper Ordovician, and Lower Silurian shales were analysed, and a high degree of vertical heterogeneity was found. In the studied sections, the total organic carbon concentrations are high at the bottom and gradually decrease upward. The total sulphur contents of the studied shales display a similar trend in the vertical direction, and they are high in the lower part of the section. The carbon isotopes of organic matter (d 13 C org) present a distinct trend that is indicative of 13 C enrichment, which indicates that the total organic carbon variations between the different shale units in the Sichuan Basin may be related to changes in ocean biomass and the sedimentary environment. The mineral composition (specifically, the pyrite, quartz, and clay abundances) of these shales suggests that the deep-water sedimentary environment was conducive to the preservation of organic matter. Total organic carbon is positively correlated with quartz contents but negatively correlated with clay contents, suggesting an input of biogenic silica. The majority of the quartz was deposited via the slow settling and accumulation of recrystallised biogenic opal and silica-rich plankton. This study of the trace element geochemistry of the Lower Palaeozoic shales indicates that productivity, burial efficiency, redox environment, and hydrothermal activity all affected the accumulation of organic matter. The Cambrian Niutitang shale is rich in nutrient elements. The Longmaxi and Wufeng shales feature high Mo contents and total organic carbon correlation coefficients of 0.93 and 0.89, respectively. Efficient burial was essential for the enrichment of organic matter in the Wufeng and Longmaxi shales. The redox parameters suggest that the organic-rich shales (total organic carbon > 2.0%)

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Geology and shale gas resource potentials in the Sichuan Basin, China

Cited by 32 publications

References 16 publications

Shale Gas Reservoir Evaluation by Geophysical Measurements: A Case Study of the Upper Ordovician–Lower Silurian in the Fenggang Block, Northern Guizhou Province

Shale Gas Reservoir Evaluation by Geophysical Measurements: A Case Study of the Upper Ordovician–Lower Silurian in the Fenggang Block, Northern Guizhou Province

Quantitative characterization of micropore structure for organic-rich Lower Silurian shale in the Upper Yangtze Platform, South China: Implications for shale gas adsorption capacity

Multiple controlling factors of lower Palaeozoic organic-rich marine shales in the Sichuan Basin, China: Evidence from minerals and trace elements

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