The role of the residual bitumen in the gas storage capacity of mature lacustrine shale: A case study of the Triassic Yanchang shale, Ordos Basin, China

Xiong, Fengyang; Jiang, Zhenxue; Chen, Jianfa; Wang, Xiangzeng; Huang, Zhilong; Liu, Guoheng; Chen, Feiran; Li, Yirun; Chen, Lei; Zhang, Lixia

doi:10.1016/j.marpetgeo.2015.10.022

Cited by 80 publications

(35 citation statements)

References 42 publications

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“…However, Zhu et al (2014) and Xiong et al (2016) observed negative relationships between specific surface areas and TOC contents for lacustrine shales in Dongying Sag and Ordos Basin, due to low thermal maturation level. In this study, the specific surface area is largely controlled by OM, as the TOC content has a positive relationship with specific surface area except for those samples with TOC>10% ( Fig.12a).…”

Section: Effect Of Toc Content On Pore Structurementioning

confidence: 88%

Characteristics and controlling factors of pore structure of the Permian shale in southern Anhui province, East China

Cao

Deng

Song

et al. 2018

Journal of Natural Gas Science and Engineering

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The Permian shale reservoir in southern Anhui province, East China is regarded as a promising target for shale gas exploration. In order to investigate the characteristics of shale pore structures and their controlling factors, total organic carbon (TOC), Rock-eval, organic petrology, X-ray diffraction (XRD), scanning electron microscopy (SEM), field emission scanning electron microscopy (FE-SEM), nitrogen gas adsorption (N 2 GA), mercury intrusion porosimetry (MIP) and helium pycnometry were conducted on the Permian shales collected from two shale gas parameter wells. The results indicate that the BET surface areas determined by N 2 GA method vary between 1.05 and 49.25 m 2 /g. The porosities derived from MIP and helium pycnometry tests are in the range of 0.68%-8.9% and 1.15%-9.79%, respectively. FE-SEM reveals that organic matter (OM) pores and cracks are well developed in the Permian shales, though some OM grains contain few pores, which might be related to the maceral composition. At a high maturity stage, vitrinite do not develop secondary OM pores, and sapropelinite generally develop abundant OM (H. Luo).the shales of the Gufeng and Dalong Formations display a higher TOC content and a better physical property than the Longtan Formation shales and appear to be superior prospective shale gas exploration potential.

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Section: Effect Of Toc Content On Pore Structurementioning

confidence: 88%

Characteristics and controlling factors of pore structure of the Permian shale in southern Anhui province, East China

Cao

Deng

Song

et al. 2018

Journal of Natural Gas Science and Engineering

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“…The clay content of Yibin Wufeng, Qainjiang Longmaxi, and Fuling Longmaxi ranges from 12% to 35% and that of Yan'an Yanchang ranges from 39% to 61%. The clay contents of marine and terrestrial shale reported range from 3.4% to 48.9% and from 10.8% to 67.5%, respectively (Xiong et al, ; Gao & Hu, ; Han et al, ). The results shown in Table are consistent with those reported in the literature.…”

Section: Methodsmentioning

confidence: 99%

Effect of Clay and Organic Matter Content on the Shear Slip Properties of Shale

Wang

et al. 2019

JGR Solid Earth

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Shale gas reservoirs contain a large number of natural fractures. When shear slip occurs during hydraulic fracturing, it will increase reservoir permeability and improve the reservoir stimulation performance. Because shale contains a large amount of clay and organic matter, its shear slip behavior differs from that of other rocks. In this study, the shear behavior of different shale blocks is experimentally studied, and the proportion of clay and organic matter in the shale dominates the shear slip behavior. Specifically, the friction coefficient and shear strength decrease with the increasing content of clay and organic matter. A microscopic support model was developed to describe the different shear slip behaviors for different contents of clay and organic matter. When the clay and organic matter content is lower than a critical threshold (~35%), shale is microscopically grain supported and brittle shear occurs and the material is prone to shear dilation. When this content is greater than a critical content (~43%), the microscopic structure is a matrix‐supported fabric and plastic shear occurs, which is prone to shear contraction. Shale with contents between these two critical thresholds has a mixed‐support fabric, which is a transition type between brittle and plastic shear. If the proportion of clay and organic matter is less than ~35%, the natural fracture tends to dilate and retain a certain degree of opening after shearing, improving stimulation performance. When the proportion is more than ~43%, shear contraction occurs on the natural fracture surface, which is not conductive and cannot increase reservoir permeability.

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“…The Yanchang area was selected as a national demonstration zone for shale gas in 2012, 67 and the LP177 well with the tested gas production of 2350 m 3 /d in the upper Triassic Chang7 Member after fracturing in 2011 and is the first continental shale gas well in China. The Yanchang area was selected as a national demonstration zone for shale gas in 2012, 67 and the LP177 well with the tested gas production of 2350 m 3 /d in the upper Triassic Chang7 Member after fracturing in 2011 and is the first continental shale gas well in China.…”

Section: Continental Shale Gasmentioning

confidence: 99%

“…In the last few years, major breakthroughs have been made in the continental shale gas exploration, and we have obtained a better understanding of accumulation mechanism and evaluation of terrestrial shale gas. The Yanchang area was selected as a national demonstration zone for shale gas in 2012, 67 and the LP177 well with the tested gas production of 2350 m 3 /d in the upper Triassic Chang7 Member after fracturing in 2011 and is the first continental shale gas well in China. 68 Since then, potential shale oil and biogenic shale gas in continental basins in northern China have been extensively proven and evaluated.…”

Section: Continental Shale Gasmentioning

confidence: 99%

Approaches for the evaluation of favorable shale gas areas and applications: Implications for China's exploration strategy

Zhang

Tang

et al. 2019

Energy Science & Engineering

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To explore practical approaches for the evaluation of favorable shale gas areas, a structural decomposition analysis with respect to the index system, evaluation criteria, weight determination, and evaluation methods was carried out. Five types of indexes were determined from 25 subindexes that formed the index system, and improved whitenization weight functions are proposed to establish evaluation criteria. The index weights calculated using entropy weight and Euclidean distance methods are consistent, whereas the weights determined by gray relational analysis are significantly affected by the relative number of indexes and evaluation objects, selected mother factor, and resolution coefficient. The significant linear positive correlation between the relative approach degree values calculated using TOPSIS and the scores obtained using fuzzy comprehensive evaluation (FCE) is indicative of a consistent evaluation result, but it should be noted that extreme indicator values can have strong effects on the evaluation using the fuzzy similarity method. Finally, an exploration strategy for China's shale gas is suggested: Areas with weak reformation and relatively low maturity are expected to be favorable for marine shale production in South China, and continental and transitional shale‐bearing basins are promising for the prospecting multiple‐origin shale gas and coal measure gas, respectively.

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The role of the residual bitumen in the gas storage capacity of mature lacustrine shale: A case study of the Triassic Yanchang shale, Ordos Basin, China

Cited by 80 publications

References 42 publications

Characteristics and controlling factors of pore structure of the Permian shale in southern Anhui province, East China

Characteristics and controlling factors of pore structure of the Permian shale in southern Anhui province, East China

Effect of Clay and Organic Matter Content on the Shear Slip Properties of Shale

Approaches for the evaluation of favorable shale gas areas and applications: Implications for China's exploration strategy

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