Numerical Investigation of Brittleness Effect on Strength and Microcracking Behavior of Crystalline Rock

Peng, Jun; Xu, Chuanhua; Dai, Bibo; Sun, Lijun; Feng, Junjun; Huang, Quan

doi:10.1061/(asce)gm.1943-5622.0002529

Cited by 48 publications

(8 citation statements)

References 52 publications

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“…The Potwar Basin has several known source rocks, including the Sakesar, Hangu, Patala, and Lockhart formations Zheng et al, 2023) (Table 2). The reservoir rocks found in the Potwar Basin include alluvial and shoreface Cambrian sandstones, Miocene alluvial sandstones, Jurassic and Permian continental sandstones, Paleogene shelf carbonates, and Miocene alluvial sandstones (Aadil et al, 2014;Kazmi & Abbassi, 2002;Peng et al, 2022). Oil and gas have been explored from reservoir (Zahid et al, 2012).…”

Section: An Overview Of the Potwar Basin's Source And Reservoir Rocksmentioning

confidence: 99%

Integrated Interpretation of Eocene-Palaeocene Rocks in Potwar Basin, Pakistan: Implications for Petroleum Generation

Shah

2023

Earth sci. res. j.

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This study demonstrates how an integrated geochemical and petrophysical analysis can be used to evaluate the petroleum generation potential of source and reservoir rocks. The Eocene and Palaeocene sequences of the Potwar Basin, located in the upper Indus Basin of Pakistan, were analyzed. Well logs and Schlumberger log interpretation charts were used for the petrophysical analysis of the Chorgali Formation's reservoir potential. Geochemical methods were applied to 34 well-cutting Sakesar and Patala formations samples. Results from Vitrinite Reflectance (VR) (%Ro) and Tmax data suggest that both formations have reached the peak of their oil generation window. The Sakesar Formation has a mean TOC of 1.88 wt. % and HI values of 375 mg HC/g TOC. The Patala Formation has a mean TOC of 3.33 wt.% in well A and HI values ranging from 2.4 to 369 mg HC/g TOC in well B, with a mean TOC of 3.52 wt%. Both formations have mixed Type II/III kerogen. The findings indicate that both the Sakesar and Patala formations possess good oil/gas-generation potential and may act as source rocks in the Potwar Basin. Petrophysical analysis of the Chorgali Formation shows an average porosity of 10.32%, water saturation of 36.14%, and hydrocarbon saturation of 63.85%. This indicates that the Chorgali Formation has an average to good reservoir potential. The research findings will aid exploration and production companies in the Fimkassar Oilfield.

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Section: An Overview Of the Potwar Basin's Source And Reservoir Rocksmentioning

confidence: 99%

Integrated Interpretation of Eocene-Palaeocene Rocks in Potwar Basin, Pakistan: Implications for Petroleum Generation

Shah

2023

Earth sci. res. j.

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“…The brittleness characteristics of rocks are a key parameter in geoengineering and geophysical studies, which directly affects the fracture behavior and stability of rocks [1][2][3]. Stress-strain curves, as an important tool for assessing the mechanical properties of rocks, provide an effective way to analyze the brittleness characteristics of rocks [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Research on the evaluation method of rock brittleness characteristics based on stress-strain curve

Tang,

2024

Applied Mathematics and Nonlinear Sciences

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In this study, not only the variability of the internal texture of rocks is considered in the in-depth investigation of the brittle fracture properties of rocks, but also the effects of different stress states and temperature factors on the fragility of rocks are focused on. Through experimental studies and data analysis of various types of rocks under different stress conditions and temperature environments, this study found that the plasticity of marble is positively related to stress. Under other stress states of 5, 15, 25, and 35 MPa, the stress-strain curves become flatter with increasing stress. Under uniaxial stress condition, the fragile strengths of different rocks are sandstone, red sandstone, granite, marble, chert, and cement mortar in that order. Whereas, under triaxial stress condition, the fragility of the rock samples was in the order of fine-grained granite, coarse-grained granite, sandstone, tuff, and marble. It was further found that the rock specimens after different high-temperature water-cooling treatments exhibited four different stages of brittle fracture, and the peak of the first stage of the rock was higher as the temperature decreased. The inclination of the peak was inversely proportional to the temperature. This study provides an essential scientific basis for the in-depth understanding of the brittle fracture characteristics of rocks and their engineering applications.

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“…The diverse mineralogical composition, textural properties, and physical characteristics of sandstones make them susceptible to weathering and degradation [5,6]. The resis-tance of these rocks to weathering is influenced by the mineralogical composition, type and percentage of cement, porosity, particle size, permeability, and the joints [3].…”

Section: Introductionmentioning

confidence: 99%

Prediction of Rock Tensile Strength Using Soft Computing and Statistical Methods

Zheng

Shen

Motahari

et al. 2023

Period. Polytech. Civil Eng.

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The tensile strength of the rocks is one of the effective factors in the rupture of structure foundations and underground spaces, the stability of rocky slopes, and the ability to drill and explode in rocks. This research was conducted to estimate tensile strength using methods such as simple regression (SR), multivariate linear regression (MVLR), support vector regression (SVR) with radial basis kernel function, multilayer feed-forward artificial neural network (MFF-ANN), Gaussian process regression (GPR) using squared exponential kernel (SEK) function, and adaptive neuro-fuzzy inference system (ANFIS) based on Gaussian membership function. For this purpose, petrography, and engineering features of the limestone, sandstone, and argillaceous limestone samples in the south of Iran, were assessed. The results obtained from this study were compared with those of previous research, revealing a strong correlation (R2=0.95 to 1.00) between our findings and the published works. To estimate Brazilian tensile strength (BTS), the index properties including water absorption by weight, point load index (PLI), porosity%, P-wave velocity (Vp), and density were considered as inputs. Methods were compared using various criteria. The SVR precision (R=0.96) was higher than MFF-ANN (R=0.92), ANFIS (R=0.95), GPR (R=0.945), and MVLR (R=0.89) to estimate the tensile strength. The average BTS measured in the laboratory and predicted by all 5 methods is 6.62 and 6.71 MPa, respectively, which shows the very high precision of the investigated methods. Analysis of model criteria using statistical analysis for developed relationships revealed that there is sufficient accuracy to use the empirical equations.

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Numerical Investigation of Brittleness Effect on Strength and Microcracking Behavior of Crystalline Rock

Cited by 48 publications

References 52 publications

Integrated Interpretation of Eocene-Palaeocene Rocks in Potwar Basin, Pakistan: Implications for Petroleum Generation

Integrated Interpretation of Eocene-Palaeocene Rocks in Potwar Basin, Pakistan: Implications for Petroleum Generation

Research on the evaluation method of rock brittleness characteristics based on stress-strain curve

Prediction of Rock Tensile Strength Using Soft Computing and Statistical Methods

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