Numerical study of multi-period palaeotectonic stress fields in Lower Cambrian shale reservoirs and the prediction of fractures distribution: A case study of the Niutitang Formation in Feng'gang No. 3 block, South China

Wu, Zhonghu; Zuo, Yujun; Wang, Shanyong; Chen, Jun; Wang, An‐Li; Liu, Leilei; Xu, Yunfei; Sunwen, Jibin; Cao, Juncai; Yu, Meilu; Lu, Can‐Zhong; Wu, Yaowen

doi:10.1016/j.marpetgeo.2016.12.008

Cited by 62 publications

(22 citation statements)

References 29 publications

(32 reference statements)

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“…Similar findings were obtained from analysis of Devonian-Mississippian shale in western Canada, showing that total porosity had a negative correlation with biogenic quartz due to the loss of pores with a diameter of less than 10 nm [50]. Furthermore, quartz of detrital origin with angular grain boundaries is more likely to form interparticle pores, which are mainly macropores and mesopores, leading to a positive correlation between detrital quartz and total porosity [23,31].…”

Section: Porosity and Controlling Factorssupporting

confidence: 76%

“…The study area is in northern Guizhou, and well YX1 is located in northwestern Fenggang County (Figure 1). Tectonically, the northern Guizhou area evolved along with the Yangtze Platform, which experienced multiple periods of tectonic movement (from the Xuefeng movement to the Himalayan movement), resulting in complex geology [31]. These tectonic movements resulted in northeast (NE)and north-northeast (NNE)-orientated folds and faults.…”

Section: Geological Settingmentioning

confidence: 99%

“…The formation of S-shaped or Z-shaped single folds is attributed to tectonic deformation dominated by compression and facilitated by strike-slip. Their presence indicates that the geological conditions under which the area developed are complicated [31,32]. Differently trending faults intersect each other.…”

Section: Geological Settingmentioning

confidence: 99%

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Total Organic Carbon Enrichment and Its Impact on Pore Characteristics: A Case Study from the Niutitang Formation Shales in Northern Guizhou

Liu

Tang

2019

Energies

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This study analyzes samples from the Lower Cambrian Niutitang Formation in northern Guizhou Province to enable a better understanding of total organic carbon (TOC) enrichment and its impact on the pore characteristics of over-mature marine shale. Organic geochemical analysis, X-ray diffraction, scanning electron microscopy, helium porosity, and low-temperature nitrogen adsorption experiments were conducted on shale samples. Their original TOC (TOCo) content and organic porosity were estimated by theoretical calculation, and fractal dimension D was computed with the fractal Frenkel–Halsey–Hill model. The results were then used to consider which factors control TOC enrichment and pore characteristics. The samples are shown to be dominated by type-I kerogen with a TOC content of 0.29‒9.36% and an equivalent vitrinite reflectance value of 1.72‒2.72%. The TOCo content varies between 0.64% and 18.17%, and the overall recovery coefficient for the Niutitang Formation was 2.16. Total porosity of the samples ranged between 0.36% and 6.93%. TOC content directly controls porosity when TOC content lies in the range 1.0% to 6.0%. For samples with TOC < 1.0% and TOC > 6.0%, inorganic pores are the main contributors to porosity. Additionally, pore structure parameters show no obvious trends with TOC, quartz, and clay mineral content. The fractal dimension D1 is between 2.619 and 2.716, and D2 is between 2.680 and 2.854, illustrating significant pore surface roughness and structural heterogeneity. No single constituent had a dominant effect on the fractal characteristics.

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Section: Porosity and Controlling Factorssupporting

confidence: 76%

Section: Geological Settingmentioning

confidence: 99%

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Total Organic Carbon Enrichment and Its Impact on Pore Characteristics: A Case Study from the Niutitang Formation Shales in Northern Guizhou

Liu

Tang

2019

Energies

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“…According to (6), the volumetric strain is proportional to the coefficient of skeleton compression. The skeleton compression coefficient of the rock can be expressed as…”

Section: Rock Mechanics Analysis Of Shalementioning

confidence: 99%

Experimental Study on the Stress Sensitivity and Influence Factors of Shale under Varying Stress

Zuo

Wang

et al. 2018

Shock and Vibration

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Shale reservoirs are characterized by extremely low permeability and high clay content. To further study the stress sensitivity of a shale reservoir, the Lower Cambrian shale in north Guizhou was utilized. Through laboratory testing, the relationships between the shale porosity and permeability and the effective stress were established, and the stress sensitivity of shale was analysed. The mechanical properties and mineral composition of this shale were studied by rock mechanics testing and X-ray diffraction. The main factors affecting the stress sensitivity were analysed. The results show that the porosity and permeability of this shale decrease with increasing effective stress; the shale reservoir permeability damage rate is 61.44 ∼ 73.93%, with an average of 69.92%; the permeability stress sensitivity coefficient is 0.04867 ∼ 0.05485 MPa −1 , with an average of 0.05312 MPa −1 ; and the shale reservoir stress sensitivity is strong. Shale stress sensitivity is related to the rock mineral composition and rock mechanical properties. The higher the clay content in the mineral composition, the lower the elastic modulus of shale, the higher the compressibility, and the greater the stress sensitivity coefficient.

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“…In recent years, with the advancement of science and technology and the in-depth development of oil and gas exploration and development, unconventional oil and gas resources, such as tight sandstone gas and shale gas, have not only completely changed energy patterns in the United States but have also profoundly affected the global energy landscape. [1][2][3][4][5][6][7][8][9][10][11] Among these resources, shale gas is an unconventional natural gas present in shale mainly in the form of adsorption or in a free state. It is characterized by its capacity for large storage, wide distribution, a long mining period, a long service life, and huge mining potential.…”

Section: Introductionmentioning

confidence: 99%

Acoustic and fractal analyses of the mechanical properties and fracture modes of bedding‐containing shale under different seepage pressures

Lou

Yin

et al. 2020

Energy Science & Engineering

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Numerical study of multi-period palaeotectonic stress fields in Lower Cambrian shale reservoirs and the prediction of fractures distribution: A case study of the Niutitang Formation in Feng'gang No. 3 block, South China

Abstract: Numerical study of multi-period palaeotectonic stress fields in Lower Cambrian shale reservoirs and the prediction of fractures distribution: a case study of the Niutitang formation in Feng'gang No. 3 block, South China'.

Cited by 62 publications

References 29 publications

Total Organic Carbon Enrichment and Its Impact on Pore Characteristics: A Case Study from the Niutitang Formation Shales in Northern Guizhou

Total Organic Carbon Enrichment and Its Impact on Pore Characteristics: A Case Study from the Niutitang Formation Shales in Northern Guizhou

Experimental Study on the Stress Sensitivity and Influence Factors of Shale under Varying Stress

Acoustic and fractal analyses of the mechanical properties and fracture modes of bedding‐containing shale under different seepage pressures

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