Article
Geosciences, Multidisciplinary
Menglei Li, Chaomo Zhang
Summary: This study aims to improve the evaluation method for shale reservoirs of the Lower Carboniferous Luzhai Formation in the central Guangxi area. By analyzing the impact of low resistivity and complex mineral composition on logging response, a series of improved methods were proposed to calculate reservoir parameters. Experimental results show that these methods significantly improve prediction accuracy and are highly consistent with core analysis results.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Energy & Fuels
Mohammad Zeyghami, Mohammad Taghizadeh Sarvestani
Summary: The main objective of net pay determination is to exclude non-reservoir intervals so that better results are obtained in reservoir characterization, hydrocarbon in-place calculations, and dynamic flow simulation. This study presents different methods for net pay determination, their strengths, limitations, and input data, along with a new procedure. The proposed methodology considers both rock and fluid properties and validates the results.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2023)
Article
Energy & Fuels
Claudio Delle Piane, Humera Ansari, Zhongsheng Li, Jitendra Mata, William Rickard, Ronny Pini, David N. Dewhurst, Neil Sherwood
Summary: The study of porosity in the Fuling shale gas play in southern China revealed that the overall porosity in the samples is proportional to their organic content, with most pores residing in organic matter. Mesopores are preferentially present in solid bitumen, showing a broader spectrum of pore sizes in organic-rich samples. Furthermore, distinguishing between primary and secondary organic matter is crucial for understanding the interconnected network of porous organic matter during hydrocarbon migration.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2022)
Article
Geochemistry & Geophysics
Mengqiang Pang, Jing Ba, Jose M. Carcione, Erik H. Saenger
Summary: This study aims to characterize tight-oil reservoirs using a dual-porosity-clay parallel network electrical model and Hashin-Shtrikman and differential effective medium equations elastic model. By analyzing rock samples, log data, and microstructures, the effects of porosity and clay content on the elastic and electrical properties are studied to achieve good agreement between predictions and actual production reports.
Article
Geosciences, Multidisciplinary
He Meng, Yueming Ye, Tangyan Liu, Shiqiong Liu, Cun Yang, Libao Wang
Summary: The paper develops a novel modified equivalent rock element model (MEREM) incorporating multiple factors to analyze the rock-electric characteristics and calculate the reservoir saturation in complex shaly sandstones. It is found that pore structure and shale significantly influence the conductive property of complex shaly sandstones, but they may cancel out each other. The conductive model presented in this paper has achieved promising results in interpreting experimental data.
NATURAL RESOURCES RESEARCH
(2023)
Article
Energy & Fuels
Hu Li, Qin Wang, Qirong Qin, Xinyu Ge
Summary: The primary gas layer in the Maokou Formation of the JLS structure in the Sichuan Basin is a typical pore-fracture carbonate gas reservoir, where natural fractures play a crucial role in improving reservoir physical properties. The fractures are predominantly tectonic in origin and have positive effects on the gas reservoirs' physical properties.
Article
Energy & Fuels
Taoli Wang, Qingtao Wang, Hong Lu, Ping'an Peng, Xin Zhan
Summary: Calcareous shale is a promising target for shale oil exploration due to its favorable properties for the movement of shale oil and shale fracturing. However, lack of understanding of pore evolution in lacustrine calcareous shale poses exploration risks. Experimental results indicate that the maturity range of 1.2-1.29 %Re is highly favorable for shale oil exploration in lacustrine calcareous shale.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Geochemistry & Geophysics
Pengwei Wang, Haikuan Nie, Zhongbao Liu, Chuanxiang Sun, Zhe Cao, Ruyue Wang, Pei Li
Summary: This paper systematically compares the pore characteristics of the Longmaxi shale and Dongyuemiao shale in the Sichuan Basin, West China. The results show that the two shales have different pore types and structures, with the Longmaxi shale dominated by organic pores and the Dongyuemiao shale primarily composed of clay-mineral pores. These findings are important for shale gas exploration.
Article
Thermodynamics
Jianguo Wu, Chao Luo, Kesu Zhong, Yi Li, Guoliang Li, Zhongming Du, Jijin Yang
Summary: To accurately and comprehensively analyze the properties of organic nanopores in marine shale, an integration method using helium ion microscope (HIM), scanning electron microscope (SEM), focused ion beam-HIM (FIB-HIM), and FIB-SEM was proposed. Results showed that organic pores below 10 nm significantly impact shale gas storage and productivity evaluation by affecting porosity, surface area, pore size distribution, and connectivity characteristics. The integration method revealed an increase in surface porosity by 10.73% and an increase in specific surface area by 76%. It also showed that the formation of organic nanopores occurs in multiple stages, with larger bubble pores appearing during oil generation and smaller spongy pores appearing during gas generation. The organic pores revealed by FIB-HIM exhibited higher coordination numbers and a higher proportion of inner-connected volume, indicating more complex connectivity characteristics. Despite limitations, these novel insights highlight the importance of exploring organic nanopores at the nanoscale and have the potential to inform further research in this field.
Article
Energy & Fuels
Tomasz Blach, Andrzej P. Radlinski, Phung Vu, Yeping Ji, Liliana de Campo, Elliot P. Gilbert, Klaus Regenauer-Lieb, Maria Mastalerz
Summary: The study found that different pore sizes are affected differently by uniaxial stress, with mesopores around 100 nm being the most affected. Additionally, it was discovered that high pressure can increase the number density of large macropores, promoting gas migration and improving recovery rates. After pressure cycling, an irreversible rearrangement of pore size distribution takes place.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2021)
Article
Energy & Fuels
Wenhui Song, Jun Yao, Kai Zhang, Yongfei Yang, Hai Sun, Zijie Wang
Summary: This paper presents a pore network based model that takes into account multiple factors affecting the mass transport of multicomponent hydrocarbons in nanoporous shale, and provides a detailed understanding of the thermodynamic transport mechanisms of multicomponent hydrocarbons. The study reveals that the transport behavior of multicomponent hydrocarbons is governed by both fluid rheology and pore size.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Yue Feng, Xianming Xiao, Enze Wang, Ping Gao, Chengang Lu, Gang Li, Zihan Wang, Qin Zhou
Summary: This study investigates the geochemical and pore characteristics of deep Longmaxi shale samples from the Luzhou area of southern Sichuan, China. The origins and quantities of different types of quartz in the shale are identified and discussed in relation to their effects on organic matter accumulation and physical properties of the shale. Three types of quartz, including terrigenous quartz, clay-mineral-transformed quartz, and biogenic quartz, are found in the shale. Each type of quartz has different effects on organic matter accumulation and physical properties, with biogenic quartz having a positive relationship with total organic carbon, porosity, and brittleness. The abundance of biogenic quartz in the shale indicates the presence of enriched organic matter and excellent physical properties, which is significant for the exploration and development of deep and ultra-deep shale gas.
Article
Energy & Fuels
Minghui Li, Mingliang Li, Haiping Huang, Lei Gong, Debao Zheng
Summary: Lower Cambrian shale and lower Silurian shale have different thermal maturities, resulting in different pore features. Lower Silurian shale has larger pore volume and surface area, and the formation of organic matter-hosted pores affects the pore characteristics. Rigid particles, clay flakes, and organic matter coexist in shale matrix, enabling the preservation of pores.
Article
Energy & Fuels
Lian-hua Hou, Song-tao Wu, Zhen-hua Jing, Xiao-hua Jiang, Zhi-chao Yu, Ganlin Hua, Ling Su, Cong Yu, Feng-rong Liao, Hua Tian
Summary: The lacustrine shale in China has higher clay mineral content compared to marine shale, which greatly impacts the quality of hydrocarbon reservoirs. The composition and content of clay minerals vary among different shale systems, resulting in differences in pore structures and hydrocarbon contents. The development of clay mineral-related pores and fractures is controlled by thermal maturity and the content of terrigenous minerals. It is important to investigate the evolution of clay minerals in lacustrine shales to evaluate their hydrocarbon generation potential and accumulation mechanisms.
Article
Energy & Fuels
Forouzan Rahmani, Mohammad Emami Niri, Golnaz Jozanikohan
Summary: This research aims to characterize the properties of a carbonate reservoir with a complicated porous structure through rock physics principles and tools. The proposed 3D rock physics templates are able to simultaneously characterize the relationship of elastic properties with pore aspect ratio, water saturation, and porosity, thus predicting reservoir properties more accurately. This rock physics-based procedure for carbonate reservoir characterization can enhance the ability to detect reservoir fluid and reduce interpretation risk.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2023)