Geochemical characteristics of marine and terrestrial shale gas in China

Dai, Jianhua; Zou, Caineng; Dong, Dazhong; Ni, Yunyan; Wu, Wei; Gong, Daoyi; Wang, Yuman; Huang, Shipeng; Huang, Jinliang; Fang, Chenchen; Liú, Dan

doi:10.1016/j.marpetgeo.2016.04.027

Cited by 166 publications

(84 citation statements)

References 32 publications

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“…的 Ra 平均值为 0.033 [83] , 后者 78 个 Ra 值为 0.002~0.050 [85] . 四川盆地五峰-龙马溪组页岩气具有次生型负碳同位素系列的Ra值为0.01~0.04 [62,63] . 原生型负碳同位素系列, 在大西洋中脊Lost City Hydrothermal Field 3871-GT15气样δ 13 C 1 值−9.9‰, δ 13 C 2 值 −13.3‰, δ 13 C 3 值 −14.2‰, δ 13 C 4 值 −14.3‰, Ra 为 8.73 [78] .…”

Section: 但由于某种地质因素影响腐殖煤壳质组比例unclassified

Coal-derived gas theory and its discrimination

Dai¹

2018

Chin. Sci. Bull.

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Section: 但由于某种地质因素影响腐殖煤壳质组比例unclassified

Coal-derived gas theory and its discrimination

Dai¹

2018

Chin. Sci. Bull.

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“…Stratigraphic column of the Lower Palaeozoic in Middle‐Upper Yangtze area (modified after Chen et al, ; Dai et al, ) [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Geological Settingmentioning

confidence: 99%

“…The Lower Silurian Longmaxi and Lower Cambrian Niutitang shales within the Middle‐Upper Yangtze area are considered the primary gas shale targets because of their widespread occurrence, large thickness, organic richness, and favourable mineral composition. By the end of 2015, four Longmaxi Formation gas shale fields had been discovered in the Jiaoshiba, Fushun‐Yongchuan, Zhaotong, and Changning‐Weiyuan areas in the Sichuan Basin (Dai et al, ). In these fields, the commercial gas flow rates were attained with total cumulative production of ~45 × 10 8 m 3 in 2015.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of nanoscale pore structure of Lower Palaeozoic marine shales in the Middle‐Upper Yangtze area, China: Implications for gas production potential

et al. 2017

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The Lower Cambrian Niutitang and Lower Silurian Longmaxi shales in the Middle‐Upper Yangtze area are considered the primary shale gas units targeted for development in China. To shed some light on the difference in nanopore structures between Niutitang and Longmaxi shales, systematic comparative investigations were conducted using various techniques, including geochemical analyses, field emission scanning electron microscopy (FE‐SEM), high‐pressure mercury intrusion porosimetry (MIP), and low‐pressure N2/CO2 adsorption techniques. The results show that both Niutitang and Longmaxi shales have high total organic carbon (TOC) content and complex mineral compositions. The porosity of Longmaxi shales is higher than that of Niutitang shales, with an average value of 3.26% and 2.04%, respectively. Interestingly, for both shale formations, the mesopores (2–50 nm) are the major contributors to pore volumes, whereas the specific surface area is dominated by micropores (<2 nm). For the mesopore size distributions (PSDs) calculated from the N2 adsorption, the Longmaxi shales have a dominant pore size ranging from 10 to 60 nm. In contrast, there are more fine mesopores (2–8 nm) in the Niutitang shales. Furthermore, we found that numerous nanoscale pores are well‐developed within graptolite‐derived organic matter (OM) in the Longmaxi shales. These interconnected graptolite periderm pore systems may not only provide a storage space for both adsorbed and free gas but also serve as pathways for gas transport. The Niutitang shales developed relatively fewer OM pores with smaller diameters, lower OM surface porosity, and lower connectivity compared to the Longmaxi shales. The differences in OM pore structure partly explain why there is a large production difference between these two formations.

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“…Thus far, most research and exploration breakthroughs for shale gas in China have focused on the Lower Silurian shale of the Middle and Upper Yangtze regions (Dai et al, ; Jiang et al, ; Li, Jiang, Zheng, Bi, & Chen, ; Wang et al, ; Yan et al, ; Zou et al, , , ). As a part of the Yangtze Platform, the neighbouring Lower Yangtze region has attracted much less interests in searching shale gas potentials (but see Du et al, ).…”

Section: Introductionmentioning

confidence: 99%

The Lower Yangtze area: A next shale gas block for China? Preliminary potential assessment from some geology and organic geochemistry information

Chen

et al. 2019

Geological Journal

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In the last several years, the massive success of the Fuling shale gas field in south‐western China has shown great potential in finding giant shale gas fields in the Upper Yangtze area, and it has also attracted the increasing attention from geologists to find more shale gas reservoirs around the world. However, there is still a great dispute as to whether the neighbouring Lower Yangtze area is a next potential shale gas block in China. In this study, we evaluate preliminarily the shale gas potentials of five important sets of marine shales based on systematic analyses for the sedimentary environment, thickness, total organic carbon (TOC), thermal maturity, and other organic geochemistry parameters of both geological records from outcrops and wells in the Lower Yangtze area. The first two sets of marine shales occur in the Lower Cambrian and the Ordovician, and they all are of over–high organic maturity due to strong effects from regional tectonic movements and thus have poor potential. Although the Lower Silurian shales are widely distributed in the Lower Yangtze region, a terrigenous delta, a low amount of organic matter (TOC < 1.2%), and late tectonic activity together created unfavourable conditions for the generation and accumulation of the Lower Silurian shale gas. The Permian black shales occur in the Middle and Upper Permian. Several proxies, such as the appropriate maturity (vitrinite reflectance Ro of approximately 2.0%), abundant organic matter (TOC of approximately 4 wt%), good total hydrocarbon potential (S1 + S2), and high level of hydrocarbon conversion have resulted in good conditions for shale gas generation. However, the relative thinness (only 30 m), severe tectonic modification, and regional cap rock are not favourable for shale gas preservation. The Lower Yangtze area therefore is not an excellent block for shale gas exploration compared to its neighbouring Upper Yangtze area. However, in some areas with less structural deformation, the possibility of finding shale gas reservoirs cannot be ruled out, especially for the Permian shales, which had a greater opportunity to generate and accumulate shale gas than the other marine shales. In addition, for new shale gas exploration breakthroughs in the future, structural studies are essential in offering better understanding of the preservation conditions in the Lower Yangtze area.

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Geochemical characteristics of marine and terrestrial shale gas in China

Cited by 166 publications

References 32 publications

Coal-derived gas theory and its discrimination

Coal-derived gas theory and its discrimination

Comparative study of nanoscale pore structure of Lower Palaeozoic marine shales in the Middle‐Upper Yangtze area, China: Implications for gas production potential

The Lower Yangtze area: A next shale gas block for China? Preliminary potential assessment from some geology and organic geochemistry information

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