Article
Engineering, Environmental
Wenbin Jiang, Gaohui Cao, Chao Luo, Mian Lin, Lili Ji, Ji Zhou
Summary: The study investigated the relationship between the composition of Wufeng-Longmaxi Formation shale samples in Sichuan Basin and methane adsorption characteristics, establishing a composition-based methane adsorption model. Differences in clay contribution to methane adsorption for different sublayers were revealed, aiding in improving the accuracy of shale reservoir evaluation.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Green & Sustainable Science & Technology
Jing Wang, Fawang Ye, Gary G. Lash, Zhaodong Xi
Summary: This study used scanning electron microscopy to investigate the types of organic matter and pore development in shale deposits in southern China, and found that the sedimentary environment is the main factor influencing these features.
Article
Geosciences, Multidisciplinary
Tonglou Guo, Xianghao Meng, Wei Lei, Mingming Liu, Liang Huang
Summary: This study conducted systematic experimental characterization to understand the pore structures and methane sorption in deep-marine shales. The results showed that factors such as organic matter content and clay minerals affect the pore structures and sorption behaviors in deep shales. The findings also indicate that deep shales have higher micropore content from organic matter and lower macropore content from clay minerals compared to shallow shales. The total organic carbon (TOC) content is the primary controlling factor on pore structure and sorption capacity in deep shales, while the influence of clay minerals on gas sorption is less pronounced.
NATURAL RESOURCES RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Guoliang Xie, Weiduo Hao
Summary: This study investigated different organic matter pores in the Longmaxi Formation shales in the Sichuan Basin using optical microscope, SEM, and adsorption experiments. The results showed that pyrobitumen and quartz-rich brittle shale play significant roles in pore development, while pores in organic matter like microorganisms and algae are mainly mesopores.
Article
Geosciences, Multidisciplinary
Yijun Zheng, Yuhong Liao, Yunpeng Wang, Yongqiang Xiong, Ping'an Peng
Summary: Changning and Fuling are two well-known shale gas fields in China with significant differences in gas content. This study investigates the mineralogical and petrophysical properties of the Wufeng-Longmaxi shales in these two areas and compares them with the Jiaoye 4 well from the Fuling field. The results show that carbonate cementation and tectonic deformation are key factors affecting the gas content in these shale reservoirs.
Article
Geosciences, Multidisciplinary
Yongbo Wei, Shuangfang Lu, Junqian Li, Rongze Yu, Wenbiao Li, Feng Cheng, Chunbo Fu, Tianlong Zhao, Wenjun Feng, Zhaojing Song
Summary: The study investigates methane carbon isotope fractionation during shale gas desorption, revealing the impact of various factors on the process and providing insights into evaluating gas content and production status in shale gas wells.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Zhen Qiu, Bei Liu, Bin Lu, Zhensheng Shi, Zhiyang Li
Summary: This study focused on the depositional and diagenetic processes controlling the fabric and petrophysical properties of black shales through the analysis of the Wufeng-Longmaxi Shale. It was found that the studied shale is mainly composed of over-mature black shales with organic matter dominated by pyrobitumen and graptolite, while minerals consist of quartz, carbonates, and clay minerals. Vertical variations in lithofacies and mineral content exhibited three cycles, likely corresponding to three transgressive-regressive cycles.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Xu Yu, Cheng Zhai, Yu Jing, Shuxun Sang, Yu Wang, Klaus Regenauer-Lieb, Yong Sun
Summary: This study presents an experimental investigation into the effect of temperature on the chemical-mechanical properties of shale rocks. The results indicate that high temperatures can significantly impact the weight and mechanical strength of shale samples, as well as the chemical reaction rates associated with shale compositions. The study also demonstrates the influence of compositional changes on the mechanical properties of shale rocks.
Article
Geosciences, Multidisciplinary
Xiaoshi Li, Hongjian Zhu, Kaixun Zhang, Zhuo Li, Yuxi Yu, Xingqiang Feng, Zongxiu Wang
Summary: Marine shales in southern China have experienced multiple complex tectonic movements, which highly impact shale pore characteristics and evolution. Through integrated experimental procedures, it was found that increasing deformation leads to higher shale permeability and changes in pore structure. This study provides insights for better understanding the pore structure evolution process in shale exploration and development under tectonic deformation.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Lulu Xu, Saipeng Huang, Yang Wang, Xianghui Zhou, Zaoxue Liu, Yaru Wen, Yanlin Zhang, Mengdi Sun
Summary: The deposition of black shale is influenced by several factors, including organic matter input, preservation, and dilution. The individual contribution of these factors to organic matter enrichment is complex due to variations in palaeodepositional conditions. This study investigated the palaeoenvironmental conditions and organic matter enrichment mechanisms in the Wufeng-Longmaxi Formation in western Hubei. The findings reveal the presence of different mineral compositions in the Guanyinqiao Formation and variations in silica origin, warm and humid climate, and factors influencing organic matter enrichment.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Engineering, Geological
Jianfeng Wang, Yuke Liu, Chao Yang, Yangcheng Zheng, Wenmin Jiang, Luca Menegon, Francois Renard, Ping'an Peng, Yongqiang Xiong
Summary: The creep properties of shale have significant implications for the stability of fault gouge, aseismic deformation, and engineering operations. This study investigates the relationship between creep parameters measured at different scales in shale samples. The results show consistency between some upscaled creep parameters from nanoindentation data and those measured at a macroscopic scale.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Energy & Fuels
Xingxing Kong, Shuangfang Lu, Dianshi Xiao, Hongjun Fan, Pengfei Mu, Shu Jiang
Summary: Shale gas resources provide new impetus for alleviating the contradiction between China's oil and gas supply and demand. Understanding the occurrence mechanism of adsorbed gas can help in the better development and utilization of shale gas resources. The experiments conducted in this study revealed that nanopores dominate shale pores, with Total Organic Carbon (TOC) playing an important role in controlling specific surface area and methane adsorption capacity. Micropores in organic matter provide the main specific surface area and adsorption sites for methane adsorption, which is mainly multilayer adsorption and micropore filling in shale.
Article
Geosciences, Multidisciplinary
Tao Wang, Fenghua Tian, Ze Deng, Haiyan Hu
Summary: The microscopic pore characteristics of shale in marine strata in northern Yunnan and Guizhou were evaluated using FE-SEM, LT-N(2)GA, LP-CO(2)GA, and HPMA experiments. Fractal Frenkel-Halsey-Hill theory was used to analyze the fractal characteristics and discuss the adsorption pore characteristics of shale. The results showed that the shale samples had complex pore structures and open pore styles, with abundant micropores and mesopores. The fractal dimensions were positively correlated with the TOC and clay mineral contents and negatively correlated with the quartz content. Fractal analysis is helpful for understanding the pore structure and adsorption capacity of shale gas reservoirs.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Energy & Fuels
Wenbiao Li, Junqian Li, Shuangfang Lu, Guohui Chen, Xiaoting Pang, Pengfei Zhang, Taohua He
Summary: Gas-in-place content and gas-adsorbed ratio are crucial parameters for resource potential assessment and production strategy optimization in unconventional gas resources. The carbon isotope fractionation model provides a powerful tool in evaluating the mechanism of isotopic fractionation during natural gas transport. The study in the Jiaoshiba area of China showed a positive correlation between methane degassing volume and TOC content, and an underestimation of shale gas resources by the traditional USBM method.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Wenping Liu, Juan Wu, Hua Jiang, Zheng Zhou, Chao Luo, Wei Wu, Xiaojia Li, Shugen Liu, Bin Deng
Summary: This study examines the relationship and multi-stage evolution between the upper Ordovician Wufeng and lower Silurian Longmaxi formations at the Changning shale gas field in southern Sichuan basin. The research utilizes low-temperature thermochronological data and structural evolution to analyze the rapid exhumation and history of the field. The results suggest a four-stage thermal evolution and significant impact of pressure index changes on shale gas enrichment.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Thermodynamics
Zhaoyi Liu, Zhejun Pan, Shibin Li, Ligang Zhang, Fengshan Wang, Lingling Han, Jun Zhang, Yuanyuan Ma, Hao Li, Wei Li
Summary: The study focused on the influence of typical fracture characteristics of volcanic rocks on hydraulic fracturing through numerical research and verification based on indoor tests and simulations. The results indicated that a decrease in the cementation strength ratio leads to an increase in hydraulic fracture propagation rate, with the cementation strength and morphology of NFs significantly affecting the propagation direction of HFs.
Article
Energy & Fuels
Zihan Sun, Tianyu Chen, Lihong Zhu, Jiyuan Lu, Shujuan Zhang, Zhejun Pan, Guanglei Cui
Summary: Understanding the evolution of permeability during rock shear displacement is crucial for geosciences and geo-engineering, such as shale gas exploitation. This study proposes two special conditions, constant stiffness (CS) and constant volume (CV), to define the upper and lower boundaries of permeability evolution. A model is established to investigate the mechanisms and factors influencing permeability evolution. The results show that the self-supporting effect and submergence effect play important roles in changing permeability during shear displacement.
Article
Geosciences, Multidisciplinary
Ze Tao, Zhiliang He, Tiago M. Alves, Xiaowen Guo, Jian Gao, Sheng He, Wen Zhao
Summary: This study investigated the structural evolution in the Lijin and Boxing sags in the Dongying depression and found that inherited structures significantly control the development of overpressure in sedimentary basins.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Bin Zhang, Yafei Zhang, Suping Zhao, Wei He, Shu Tao, Zhejun Pan, Yi Cui
Summary: This study conducted CH4 isothermal adsorption measurements on 64 coal samples from western Guizhou Province in China and quantitatively analyzed the desorption processes of coalbed methane (CBM). The results indicate that coalification affects the Langmuir volume and pressure, which tend to increase with higher vitrinite reflectance. The CBM desorption process was divided into four stages (inefficient, slow, fast, and sensitive) using three key pressure nodes. The fast and sensitive desorption stages are crucial for achieving high gas production.
FRONTIERS OF EARTH SCIENCE
(2023)
Article
Mechanics
Yu Suo, Xianheng Su, Zijian Wang, Wenyuan He, Xiaofei Fu, Fuping Feng, Zhejun Pan, Kun Xie, Guanzhong Wang
Summary: This study investigated the hydraulic fracturing of sandstone-shale interbedded reservoirs in the Songnan Region of China through rock mechanics experiments and numerical simulations. The effects of eight parameters on fracture propagation height and length were analyzed. The results provide guidance for the efficient development of sandstone-shale interbedded reservoir fracturing.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Energy & Fuels
Chima Finnian Ukaomah, Mengdi Sun, Zhejun Pan, Mehdi Ostadhassan, Bo Liu, Yanran Xu, Agwom Istifanus Madaki, Happiness Ijeoma Umeobi, Mohammed Dahiru Aminu, Baolin Yang
Summary: In this study, the gas storage capacity and CO2 sequestration suitability of the Longmaxi and Niutitang shale gas reservoirs were compared. The results showed that the Longmaxi shale has higher storage capacity and better pore connectivity, indicating its potential for CO2 storage and enhanced gas recovery (EGR).
Article
Engineering, Geological
Jun Zhang, Qiangang Yu, Yuwei Li, Zhejun Pan, Bo Liu
Summary: This study investigates the vertical propagation mechanism of hydraulic fractures in interlayered brittle shale formations. Experimental modeling and quantitative analysis are conducted to study the effects of geological and engineering factors on fracture propagation behavior. The results show that interlayer dip angle, vertical in situ stress difference, and interface cementation strength are important factors affecting fracture propagation. The brittleness characteristics of the interlayer also have a significant impact. The findings provide a deeper understanding of fracture geometry and the fracture intersection mechanism, offering accurate guidance for fracturing parameter optimization.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Geosciences, Multidisciplinary
Hongyan Qu, Yan Peng, Zhejun Pan, Xiangdong Xu, Fujian Zhou
Summary: Water-flooding is an effective method for developing extra-low permeability oil reservoirs, but water-rock interactions can alter geomechanical properties and impact the propagation of water-flooding induced fractures (WIFs). This study proposes a method to calculate WIF propagation length and establishes numerical models considering the effect of water-rock interactions. The models are validated and the mechanism and impact of water-rock interactions on WIF propagation are analyzed.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Thermodynamics
Ruirui Li, Luqing Zhang, Jian Zhou, Zhenhua Han, Zhejun Pan, Holger Schuettrumpf
Summary: This study investigates the influence of mineral particle shape and pore-filling natural gas hydrate (NGH) on permeability anisotropy. Simulation methods are used to construct numerical samples and calculate anisotropic permeabilities. The results show that elongated particles have minimal effect on permeability anisotropy, while preferential alignment of plate-shaped particles is the main cause. Understanding the formation mechanism of permeability anisotropy has potential applications in NGH exploitation, groundwater environment protection, and geological disaster prevention.
Review
Geosciences, Multidisciplinary
Changqing Fu, Yi Du, Wenlei Song, Shuxun Sang, Zhejun Pan, Ning Wang
Summary: Automated Mineralogy (AM) is a semi-automatic mineralogical tool that uses a scanning electron micrography-energy dispersion spectrometry (SEM-EDS) platform. It can analyze sedimentary environments, diagenetic evolution processes, and evaluate oil and gas reservoirs. The combination of AM and CT scanning can improve the accuracy of mineral distribution and be applied to study fluid reactive transport effects.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Engineering, Chemical
Duo Wang, Sanbai Li, Dongxiao Zhang, Zhejun Pan
Summary: The transport mechanism of densely-packed proppant bed is numerically investigated using the lattice Boltzmann-discrete element coupling method (LB-DEM). This study focuses on the bedload transport of settled proppants in the primary fracture. The results show a nonlinear relationship between particle flux and fluid flux, which is attributed to the shear-thinning property of the proppant bed. The research contributes to an improved hydraulic fracturing operation by optimizing the fracturing fluid injection scheme and proppant flowback control.
Article
Engineering, Marine
Sile Wei, Mingyi Hu, Sheng He, Yanbo Shu, Tian Dong, Qing He, Wei Yang, Quansheng Cai
Summary: Investigation on the Lower Cambrian Shuijingtuo Formation shale in South China revealed the types and sources of authigenic quartz and its relation to organic matter pores. Four types of quartz were identified in the shale: detrital quartz, replacement of biosiliceous debris, euhedral quartz in interparticle pores, and microquartz dispersed in a clay matrix. The dominant forms of authigenic quartz were found to be euhedral quartz and matrix-dispersed microquartz. The silica sources were identified as biogenic silica and clay-derived silica, with biogenic silica being the major source for authigenic quartz in organic-rich samples. Petrographic observations suggested that the precipitation of euhedral quartz in interparticle pores during early diagenesis enhanced rock stiffness and protected organic matter pores, while the precipitation of microquartz in the clay matrix during late diagenesis reduced the capacity for retained petroleum and limited the development of organic matter pores.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Geochemistry & Geophysics
Wei Fu, Wangshui Hu, Quansheng Cai, Sile Wei, Jiachao She, Xiaochen Wang, Xiaodong Liu
Summary: The sedimentary environment and organic matter enrichment relationship of the Upper Ordovician Wufeng Formation black shale, Guanyinqiao mudstone, and Lower Silurian Longmaxi Formation black shale in the Sichuan Basin of Weiyuan are analyzed using geochemical methods. The results show that both the Wufeng and Longmaxi Formations are organic matter enrichment layers, and different depositional conditions are indicated by various indicators.
Review
Energy & Fuels
Biao Hu, Yuanping Cheng, Zhejun Pan
Summary: The pore structures in coal are crucial for the occurrence and migration of coalbed methane (CBM), which plays a significant role in CBM extraction, utilization, and coal mining disaster prevention. Existing pore classification methods for coal have their drawbacks, thus this paper systematically reviews previous methods and proposes a new pore classification based on the characteristics of CH4 occurrence and migration in coal. This new method categorizes pore structures into four types and provides a more intuitive understanding of CBM occurrence and migration.
GAS SCIENCE AND ENGINEERING
(2023)
Review
Energy & Fuels
Qing Liu, Mengdi Sun, Xianda Sun, Bo Liu, Mehdi Ostadhassan, Wanxia Huang, Xiaoxia Chen, Zhejun Pan
Summary: X-ray computed tomography (X-ray CT) scanning is a non-destructive visualization technology that can be used to characterize multiscale shale pore structures and assess their permeability. Various imaging techniques, such as micro-CT, nano-CT, FIB-SEM, and contrast agent injections, provide a powerful approach for evaluating shale microstructures. Additionally, digital rock physics (DRP) based on 3D visualization can be used for flow modeling and predicting transport properties. CT scanning can also capture the significant evolution of microstructures during geological processes or hydrocarbon exploitation.
GAS SCIENCE AND ENGINEERING
(2023)
Article
Geosciences, Multidisciplinary
Weijiao Ma, Jinbu Li, Min Wang
Summary: The petroleum resource assessment obtained from laboratory tests on old core samples tends to underestimate the in situ resources. This study investigates the hydrocarbon loss and restoration by comparing preserved and exposed core samples. It is found that previous studies have severely underestimated the in situ hydrocarbon potential due to factors such as sample crushing and crucible waiting. A new restoration model is proposed to compensate for these losses.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Shaoyun Chen, Yongqiang Yang, Longwei Qiu, Xiaojuan Wang, Erejep Habilaxim
Summary: Quartz cement is an important authigenic mineral in the tight sandstones of the Shaximiao Formation in the Sichuan Basin. This study analyzed the silicon sources of the quartz cement using mineralogical, fluid inclusion, and geochemical data. The results showed that smectite alteration and dissolution of aluminosilicate minerals were the primary sources of silicon for quartz cementation. Contributions from volcanic material hydrolysis and pressure solution were relatively minor. The presence of chlorite films inhibited the development of quartz overgrowths and had minimal impact on reservoir quality.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Xing Jian, Ping Guan, Ling Fu, Wei Zhang, Xiaotian Shen, Hanjing Fu, Ling Wang
Summary: This study presents a synthesis of new detrital zircon dating results and published data from the Cenozoic Qaidam basin, revealing the spatiotemporal variation of detrital zircon age populations and supporting models of synchronous deformation in northern Tibet. The study emphasizes the importance of considering textural and sedimentological parameters in zircon provenance interpretations, as well as the need for integrated provenance analysis involving other detritus components.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
A. Peketi, G. Sriram, A. Mazumdar, P. Dewangan, A. Zatale, V. Rajurkar, Gayatri Shirodkar, V. Mahale, V. Yatheesh
Summary: This study investigates 13 submarine seamounts in the southern Andaman volcanic arc and observes evidence of hydrothermal activity in one of the seamounts. The evidence includes plumes rich in dissolved gases, live chemosymbiotic organisms, and the deposition of neoforming minerals. These observations suggest the development of a new hydrothermal field in the least explored Andaman Sea.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Yanxian Zhu, Zhiliang He, Xiaowen Guo, Long Li, Sheng He, Jian Gao, Shuangjian Li, Huili Li
Summary: This study investigates the fluid evolution history of the hydrothermal dolomite reservoir in the Middle Permian Maokou Formation in the Sichuan Basin. The results reveal the diagenetic sequences, mineral origins, salinity history, and pressure evolution using various analytical techniques. The findings provide important insights into the gas charge, escape, and preservation conditions of the reservoir.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Rafaella de Carvalho Antunes, Julia Campos Guerrero, Ricardo Jorge Jahnert
Summary: This study presents a detailed sedimentary model and identifies various sedimentary facies associations in the coquina deposits of the Itapema Formation in the offshore pre-salt Buzios Field of the Santos Basin. These facies associations were primarily influenced by waves and currents and reflect a complex depositional system.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Kang Meng, Tongwei Zhang, Deyong Shao, Xiuyan Liu, Hui Song, Heng Peng
Summary: In this study, an integrated method of measuring optical reflectance and Raman spectroscopy is proposed to accurately determine the thermal maturity of Lower Cambrian shales in South China. The results show that this method is reliable and effective, and it has important implications for analyzing overmature shale.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Mohamed A. K. El-Ghali, Olga Shelukhina, Iftikhar Ahmed Abbasi, Mohamed S. H. Moustafa, Osman Salad Hersi, Numair A. Siddiqui, Khalid Al-Ramadan, Abdullah Alqubalee, Abdulwahab Muhammad Bello, Abduljamiu O. Amao
Summary: This study employs an integrated depositional and sequence stratigraphic approach to assess the control of diagenesis on reservoir porosity of a hybrid-energy delta system. The study focuses on the Barik Formation in the Haushi-Huqf region of Central Oman, which represents a highstand system tract of a hybrid-energy delta. The assessments reveal that the reservoir porosity is controlled by various degrees of diagenetic processes, including mechanically infiltrated clays and kaolinitization of silicate grains.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Xiaocan Yu, Chunlian Wang, Hua Huang, Kai Yan
Summary: Oilfield brines are a significant alternative lithium resource. This study investigates the metallogenic characteristics and enrichment process of oilfield brines from the Jianghan Basin, central China using chemical and multi-isotope data. The results suggest that lithium enrichment in these brines is the result of interaction with clastic host rocks and dilution by meteoric water.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Jianghao Qiao, Xiwu Luan, Thanuja D. Raveendrasinghe, Yintao Lu, Guozhang Fan, Xinyuan Wei, Long Jin, Jian Yin, Haozhe Ma, Lushan Jiang
Summary: This study investigates the Tanintharyi passive continental margin in the Andaman Sea and reveals the potential of the Oligocene/Early Miocene carbonate platform in the region as a significant hydrocarbon reservoir. It also examines the influence of changes in sedimentary facies and the tectonic setting of the Andaman Sea on the evolution of pockmarks.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Anastasios Nikitas, Georgios Makrodimitras, Maria V. Triantaphyllou, Nikolaos Pasadakis, Kimon Christanis, Stavros Kalaitzidis, Grigoris Rousakis, Ioannis Panagiotopoulos, Alexandra Gogou, Alexandros Papadopoulos, Efthimios Tartaras, Aristofanis Stefatos
Summary: Due to the lack of deep wells in the broader region, studying mud volcanic deposits can improve the geological understanding of the Mediterranean Ridge. In this study, biostratigraphic and geochemical analyses were performed on mud breccia deposits from five Mud Volcanoes in the central MR. The results indicate the origin of these deposits and provide insights into the source rock potential. Seismic data is also used to determine the distribution of major lithostratigraphic formations.
MARINE AND PETROLEUM GEOLOGY
(2024)