Article
Energy & Fuels
Yufang Xue, Zhongxian Cai, Heng Zhang, Qingbing Liu, Lanpu Chen, Jiyuan Gao, Fangjie Hu
Summary: Predicting the petrophysical properties of carbonate reservoirs is challenging due to their heterogeneity and complex pore systems. This study analyzed 26 samples of vuggy dolostones and identified four types of pore systems. The heterogeneity of the carbonate reservoirs was quantitatively evaluated, and it was found that different pore systems result in variable porosities, pore structures, and heterogeneity. The study also discovered that the REV sizes of vuggy dolostones are commonly larger than traditional core plugs. A new model was established to effectively predict REV sizes based on quantitative parameters, and the results provide valuable insights into accurately evaluating the petrophysical properties of vuggy carbonate reservoirs.
Article
Engineering, Environmental
Wei Li, Zhechao Wang, Liping Qiao, Jinjin Yang, Jiajia Li
Summary: The study investigates the size effect on surface morphology and permeability of rock fractures. The representative elementary surface size for fracture surface roughness is 300-400 mm, while for fracture permeability it is less than 100 mm.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Engineering, Geological
Kam Ng, J. Carlos Santamarina
Summary: Carbonate rocks are widely used in civil infrastructure and are important for geoenergy geoengineering. This study focuses on the properties of limestone carbonate rocks by analyzing data from Madison Limestone and published sources. The results show that the physical properties of carbonate rocks are highly dependent on porosity and can be described by a power model. The mechanical properties are found to be sensitive to porosity, and there is a porosity-independent ratio between stiffness and strength. The permeability of carbonate rocks varies greatly with changes in porosity.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Energy & Fuels
Sergey Krivoshchekov, Alexander Kochnev, Nikita Kozyrev, Andrey Botalov, Olga Kochneva, Evgeny Ozhgibesov
Summary: For highly heterogeneous complex carbonate reef reservoirs, rock typing based on depositional conditions, secondary processes, and permeability and porosity relationships is beneficial for improving reservoir characterization, modeling, predicting reservoir properties, and estimating reserves. This review explores various rock typing methods and presents a method combining hydraulic flow units and the R35 method. Clustering methods are utilized for rock typing, and the optimal clustering method is identified. Permeability-porosity relationships are developed for each rock type, providing useful input for geomodelling.
Article
Energy & Fuels
Hossein Khoshdel, Abdolrahim Javaherian, Mohammad Reza Saberi, Saeid Rezakhah Varnousfaderani, Mehdi Shabani
Summary: This paper proposes an integrated workflow using rock physics modeling and seismic inversion to estimate the permeability section of carbonate reservoirs. By estimating pore types and investigating their contribution to permeability, better permeability estimation results are obtained.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Wensong Huang, Yong Cui, Fang Xu, Zheng Meng, Songwei Guo, Chaoqian Zhang
Summary: Permeability analysis is crucial for highly heterogeneous reservoirs like fractures-vuggy carbonate reservoirs, as traditional laboratory measurements may not accurately capture the permeability values of such samples. This research proposed an innovative approach for permeability estimation based on 2D image analysis of pores, fractures, and vugs, which allows for direct calculation of absolute permeability values with more stability than core analysis data, aiding in the selection of permeability values for reservoir modeling. Comparing estimation results from different statistical intervals can reveal the heterogeneity of the parameter.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Energy & Fuels
Wei Liu, Dongyang Han, Gang Wang, Xiangyu Chu
Summary: CT scanning is an essential tool for evaluating coal microstructure, providing non-destructive quantization and visualization. By analyzing the representative elementary volume (REV) of coal samples, a relationship between model sizes and pore structure properties has been established. The comprehensive evaluation of REV improves the rationality and reliability of coal microstructure reconstruction.
Article
Geosciences, Multidisciplinary
A. Mangione, H. Lewis, S. Geiger, Z. Jiang, G. D. Couples, J. Buckman, S. Beavington-Penney, S. A. Hall
Summary: The study utilized MCAM to analyze the diagenetic history of the Eocene carbonate reservoir in the Hasdrubal Field, exploring the impact of interactions between different components on reservoir properties. This approach can help understand the process of evolution of petrophysical properties in rock formations.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Thermodynamics
Federico Javier Medina, Ignacio Jausoro, Maria Alejandra Floridia Addato, Maria Jimena Rodriguez, Federico Gonzalez Tomassini, Alberto Caneiro
Summary: Field Emission Scanning Electron Microscopy (FESEM) is commonly used for shale characterization. This study proposes a novel method based on the Zcontrast criterion to identify Representative Elementary Area (REA) in shale. The results show a large spread in the porosity data computed in different areas of the same sample, but the Zcontrast criterion leads to a lower spread in porosity values.
Article
Geochemistry & Geophysics
A. T. Krzyzak, W. Mazur, A. Fheed, W. P. Weglarz
Summary: This study explores the application of diffusion tensor imaging (DTI) in the characterization of rock core samples, demonstrating its potential in studying the pore space characteristics through analysis of DT parameters and visualization results. The introduction of a new parameter, principal diffusion tracts, provides additional information to understand the microgeometry of the sample's pore network. The study also showcases the potential applications of DTI in determining pore size distribution, tortuosity, and conductivity.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
J. A. McBeck, B. Cordonnier, F. Renard
Summary: Determining the size of the representative elementary volume (REV) is crucial for upscaling properties from laboratory measurements to crustal systems. The REV size is expected to evolve as fracture networks propagate and coalesce. However, it may not systematically increase in all experiments due to the highly heterogeneous porosity distributions. In sandstone experiments, the REV size does increase systematically, suggesting that intact sandstone estimates may be applicable to damaged sandstone.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Mingwei Li, Zhifang Zhou, Meng Chen, Jian Wu
Summary: Studying the topological characteristics of fractured rock mass can help estimate the topological representative element volume (TREV) and accurately calculate the permeability representative element volume (PREV), simplifying the seepage calculation process.
APPLIED SCIENCES-BASEL
(2022)
Article
Geochemistry & Geophysics
Alannah C. Brett-Adams, Larryn W. Diamond, Samuel Weber, Samuel A. Gilgen
Summary: This study assesses the porosity and permeability of altered MORB-like basalts in the Semail ophiolite, Oman, and finds that they play a significant role in high-temperature systems. The porosity and permeability of the altered rocks were influenced by rock type and degree of alteration.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Engineering, Geological
Junbao Wang, Qiang Zhang, Zhanping Song, Xinrong Liu, Xiaopeng Wang, Yuwei Zhang
Summary: This study conducted fatigue tests on salt rock specimens under different maximum cycling stresses to investigate the microstructural variations and damage evolution of salt rock under cyclic loading. The results showed that the pore radii varied with an increase in the number of cycles, and the porosity and permeability of the salt rock exhibited two-stage changes. The damage evolution process of the salt rock specimens consisted of three stages, with significant damage occurring near failure.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Energy & Fuels
Peng Chi, Jianmeng Sun, Zhiyong Wang, Ruikun Ju, Baojun Wei, Youxiang Duan
Summary: A new permeability model for fractured-vuggy carbonate reservoirs was developed using digital rock models and nuclear magnetic resonance experiments. The study found that fractures significantly affect permeability, while vugs have less of an impact. The new model improves the accuracy of permeability calculation for triple-porosity reservoirs.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)