Article
Energy & Fuels
Siyu Wang, Maojin Tan, Xiaochang Wang, Lingtan Zhang
Summary: This study utilized numerical simulation and microscopic analysis to investigate the electrical properties and water saturation models of fractured rocks in carbonate formations. The research found that resistivity decreases with increasing fracture aperture, length, or quantities, with different changes in three directions as fracture dip rises, indicating electrical anisotropy of the rock. Additionally, the resistivity index was strongly correlated to water saturation, conforming to Archie's law in highly water-saturated regions but exhibiting Mon-Archie behavior in low water-saturation regions. New saturation models were established for fractured carbonate rocks and proved more applicable in formation evaluation in Tahe Oilfield.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Viswasanthi Chandra, Gwenole Tallec, Thomas Finkbeiner, Volker Vahrenkamp
Summary: This article presents an integrated method for characterizing hydraulic flow units in subsurface reservoirs using multiscale images and petrophysical data analysis. It demonstrates the application of this method to carbonate rocks in a Late Jurassic formation in Saudi Arabia. The approach combines various imaging techniques and petrophysical analysis to accurately characterize the flow units and improve reservoir characterization. The findings show that whole-core CT data is a valuable tool for bridging the scale gap between well data and reservoir models.
Article
Energy & Fuels
Mohamed Mahrous, Enzo Curti, Sergey Churakov, Nikolaos Prasianakis
Summary: This paper aims to obtain the petrophysical parameters of Indiana limestones in order to reduce uncertainties in core-scale reactive transport simulations of carbonate rocks. By combining high resolution tomography with pore scale calculations, the rock minimum representative volume, frequency distributions of petrophysical parameters, relationships between the parameters, and the spatial correlation model and lengths of the rock have been determined.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Geochemistry & Geophysics
Saeid Sadeghnejad, Frieder Enzmann, Michael Kersten
Summary: Conventional and unconventional hydrocarbon rocks have complex pore structures, where digital twins can be used to quantify their properties and predict flow transport at the pore scale. Digital rock chemistry and biology come into play when fluid-rock interactions or microbial activities are involved.
APPLIED GEOCHEMISTRY
(2021)
Article
Energy & Fuels
Zhang Xiaoxia, Yu Jiajie, Li Nianyin, Wang Chao
Summary: This study focuses on multi-scale fracture prediction and quantitative characterization of fractured carbonate reservoirs using three-dimensional seismic imaging logging and regional tectonic stress field distribution data. Combining various attributes such as variance cube, curvature, and through-flowline system, large-scale cracks are recognized while a small- and medium-sized fracture model is established based on the maximum positive curvature attribute, fracture density, and fracture direction interpreted by imaging logging. Ultimately, the study aims to accurately describe and characterize the multi-scale fracture distribution law to guide the fine development of oilfields.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2021)
Article
Thermodynamics
Rui Song, Yao Wang, Yu Tang, Jiajun Peng, Jianjun Liu, Chunhe Yang
Summary: This study presents the first attempt in literature to create a 3D printed sample of natural sandstone from a micro-CT image, achieving a printing resolution of 2 μm. Comparative analysis of pore structure, pore size distribution (PSD), porosity, and permeability between the 3D printed sample and the original sample is conducted using DRP simulation. The visualized CO2 displacing oil experiment is performed on the 3D printed sample and compared with experimental benchmark data. The findings provide insights into the pore structure mismatch, causes for such mismatch, and the oil wetting behavior of the printed sample.
Article
Geosciences, Multidisciplinary
Xu Zhou, Qingfu Zhang, Hongchuan Xing, Jianrong Lv, Haibin Su, Zhaoqin Huang
Summary: Acidizing technology is an effective method for reservoir reformation, with the optimal injection rate being a key factor in reducing costs and improving results in fractured carbonate rock. Fractures have no impact on the optimal acid injection rate, only affecting the dissolution structure.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geochemistry & Geophysics
Javad Sharifi
Summary: Intelligent rock physics modelling offers an accurate and efficient way to measure pore space and improve rock physics modelling results. By utilizing techniques such as image analysis and pattern recognition, automatic detection and classification of pore types and aspect ratio can be achieved, leading to more accurate modelling results.
GEOPHYSICAL PROSPECTING
(2022)
Article
Geosciences, Multidisciplinary
Harrison P. Lisabeth, Jonathan Ajo-Franklin
Summary: Standard rock physics models are not suitable for monitoring rocks with different structures, such as low porosity, fractured reservoirs. However, the presence of fractures can be leveraged for remote monitoring purposes due to stress dependence.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Engineering, Geological
Ameh Peter, Xiaoqiang Jin, Xianfeng Fan, Kenneth Imo-Imo Eshiet, Yong Sheng, Dongmin Yang
Summary: This research used digital rock physics to evaluate the pore geometry properties of rocks saturated with different phases of CO2-brine under reservoir conditions. The results show that the phase of CO2 significantly affects the porosity and pore surface characteristics, providing valuable information for simulating CO2 storage in reservoir rocks.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Yifan Chen, Biyang Sheng, Shijie Xie, Rihong Cao, Yixian Wang, Yanlin Zhao, Hang Lin
Summary: This paper investigates fracture propagation and scale effect in random fractured rock samples under compression-shear condition. The samples are produced with rock-like materials, and the mechanical responses are studied by controlling the compression-shear angle. The strain field evolution is analyzed using digital image processing technology, and the influence of compression-shear angle on failure mode is revealed.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Energy & Fuels
Rail Kadyrov, Danis Nurgaliev, Erik H. Saenger, Martin Balcewicz, Rezit Minebaev, Evgeny Statsenko, Mikhail Glukhov, Aigul Nizamova, Bulat Galiullin
Summary: The study evaluated the possibility of using digital cuttings analysis and rock physics for reservoir properties evaluation by collecting carbonate samples of core and cuttings from deviated wells in Russia. The results showed significant differences in cuttings' structures, with erosion of high porous varieties during the drilling process.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Javad Sharifi
Summary: The existing rock physics models for carbonate rocks have limitations in considering a wide range of pore types, leading to high uncertainty. This research proposes a modification to overcome this limitation by integrating a classification scheme and pattern recognition technique, resulting in a more comprehensive model.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Qianghui Xu, Lijun Guan, Wei Zhang, Lin Shi, Haipeng Shao, Guanqun Wang, Wei Long
Summary: This study developed multiscale workflows to predict the permeability of fractured carbonates, vuggy carbonates, and conglomerates. By comparing different methods, the best permeability analysis method for these three rock types was identified.
Article
Energy & Fuels
Hani Salman Al-Mukainah, Syed Rizwanullah Hussaini, Jack Petrovich Dvorkin
Summary: This work discusses how to generate a physically valid transform between porosity and electrical resistivity at different spatial scales using elemental data obtained from small natural rock fragments. By utilizing process-based upscaling, the authors demonstrate, through examples, the feasibility of obtaining a coarse-scale transform between these two physical properties, proving that the method is generalizable to address similar questions in different situations.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)