Characteristics and Main Controlling Factors of Fractures within Highly-Evolved Marine Shale Reservoir in Strong Deformation Zone

Zhou, Xiaojin; Wang, Ruyue; Du, Z.; Wu, Jian; Wu, Zhonghu; Ding, Wenlong; Li, Ang; Xiao, Zikang; Cui, Zixian; Wang, Xinghua

doi:10.3389/feart.2022.832104

Cited by 6 publications

(2 citation statements)

References 92 publications

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“…Geological hazards such as landslides, rock collapses (Figure 1A) and rockbursts (Figure 1B) are rock destabilization phenomena caused by the evolution of rock fracture. The types of rock fractures can be mainly divided into tensile fracture, extensional shear fracture and compressional shear fracture (Etheridge, 1983;Zhou et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

A SVM-based method for identifying fracture modes of rock using WVD spectrogram features of AE signals

Qin¹,

Chen

Yan³

et al. 2023

Front. Earth Sci.

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In order to achieve the highly efficient and accurate identification of fracture modes including tension or shear fractures during rock failure, an intelligent identification method based on Wigner-Ville distribution (WVD) spectrogram features of acoustic emission (AE) signals was proposed. This method was mainly constructed by the following steps: Firstly, AE hits corre-sponding to tension and shear fractures were obtained through conducting the Brazilian disc test (tension fracture) and direct shear test (shear fracture) of limestone. Secondly, the WVD spectro-grams of these tensile-type and shear-type AE hits were respectively extracted and then trans-formed into the image features of relatively low-dimension as the sample set based on the gray-level cooccurrence matrix (GLCM) and histogram of oriented gradient (HOG). Finally, on the basis of the processed and classified sample set of the WVD spectrogram features, an identifica-tion model of rock fracture modes was established by a support vector machine (SVM) learning algorithm. To verify this method, the fracture modes of limestone subjected to biaxial compres-sion were identified by the method. The results showed that the method not only can greatly re-veal the fracture modes change from tension-dominated to shear-dominated fractures, but also has advantages over the RA-AF value method, such as applicability, accuracy and practicality.

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Section: Introductionmentioning

confidence: 99%

A SVM-based method for identifying fracture modes of rock using WVD spectrogram features of AE signals

Qin¹,

Chen

Yan³

et al. 2023

Front. Earth Sci.

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show abstract

“…[16,30,69-82]).Figure 5. Lithofacies triangle diagram of marine organic-rich shale in South China (data of Cambrian shale from Refs [16,30,[69][70][71][72][73][74][75][76][77][78][79][80][81][82]…”

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confidence: 99%

Reservoir Characteristics and Resource Potential of Marine Shale in South China: A Review

Zhang

Gou

2022

Energies

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Many sets of Paleozoic marine organic-rich shale strata have developed in South China. However, the exploration and development results of these shale formations are quite different. Based on the data of core experiment analysis, drilling, fracturing test of typical wells, the reservoir differences and controlling factors of four sets of typical marine organic-rich shale in southern China are investigated. The four sets of shale have obvious differences in reservoir characteristics. Ordovician–Silurian shale mainly develops siliceous shale, mixed shale and argillaceous shale, with large pore diameter, high porosity, moderate thermal maturity, large pore volume and specific surface area. Cambrian shale mainly develops siliceous shale and mixed shale, with small pore diameter, low porosity, high thermal maturity and smaller pore volume and specific surface area than Ordovician–Silurian shale. Devonian–Carboniferous shale has similar mineral composition to Ordovician–Silurian shale, with small pore diameter, low porosity, moderate thermal maturity and similar pore volume and specific surface area to that of Cambrian shale. Permian shale has very complex mineral composition, with large pore diameter, low to medium thermal maturity and small specific surface area. Mineral composition, thermal maturity and tectonic preservation conditions are the main factors controlling shale reservoir development. Siliceous minerals in Cambrian shale and Ordovician–Silurian shale are mainly of biological origin, which make the support capacity better than Devonian–Carboniferous shale and Permian shale (siliceous minerals are mainly of terrigenous origin and biological origin). Thermal maturity of Ordovician–Silurian shale and Devonian–Carboniferous shale is moderate, with a large number of organic pores developed. Thermal maturity of Cambrian shale and Permian shale is respectively too high and too low, the development of organic pores is significantly weaker than the two sets of shale above. There are obvious differences in tectonic preservation conditions inside and outside the Sichuan Basin. Shale reservoirs inside the Sichuan Basin are characterized by overpressure due to stable tectonic activities, while shale reservoirs outside the Sichuan Basin are generally normal–pressure. Four sets of marine shale in South China all have certain resource potentials, but the exploration and development of shale gas is still constrained by complicated geological conditions, single economic shale formation, high exploration and development costs and other aspects. It is necessary for further research on shale gas accumulation theory, exploration and development technology and related policies to promote the development of China’s shale gas industry.

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Structural analysis, faulting system distribution, and geomechanical modeling of the Najmah Formation for improved drilling efficiency and well stability in Raudhatain and Sabriyah fields, North Kuwait

Afife,

Amawy,

Mohammed

et al. 2024

Environ Earth Sci

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Characteristics and Main Controlling Factors of Fractures within Highly-Evolved Marine Shale Reservoir in Strong Deformation Zone

Cited by 6 publications

References 92 publications

A SVM-based method for identifying fracture modes of rock using WVD spectrogram features of AE signals

A SVM-based method for identifying fracture modes of rock using WVD spectrogram features of AE signals

Reservoir Characteristics and Resource Potential of Marine Shale in South China: A Review

Structural analysis, faulting system distribution, and geomechanical modeling of the Najmah Formation for improved drilling efficiency and well stability in Raudhatain and Sabriyah fields, North Kuwait

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