Article
Geosciences, Multidisciplinary
Viswasanthi Chandra, Alexander Petrovic, Pankaj Khanna, Ahmad I. Ramdani, Bora Yalcin, Volker Vahrenkamp, Thomas Finkbeiner
Summary: This paper presents a comprehensive analysis of multiscale geological, petrophysical and rock mechanical data acquired from 35 m of outcrop well core from the Late Jurassic Upper Jubaila Formation in Saudi Arabia. The study identified four main lithofacies types and discussed factors influencing rock properties and mechanical behavior, such as mineralogy, dedolomitization, and permeability controls. Despite reduced porosity, the compressive rock strength in the outcrop core was found to be lower than that of the subsurface equivalent rocks, indicating overall weakening of the rock due to telogenetic processes and surface weathering.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geology
Enrico Bonamini, Fabrizio Berra
Summary: The Norian succession in the Southern Alps of Italy contains thick deposits of resedimented carbonates that were deposited in fault-controlled basins. Detailed analysis of stratigraphic logs provides valuable information on the distribution of different depositional processes and helps interpret basin morphology.
SEDIMENTARY GEOLOGY
(2022)
Article
Engineering, Environmental
Jinyu Dong, Xinglong Yang, Jihong Yang, Chuang Wang
Summary: Problems related to slope stability in hydropower projects in southwestern China are common. A field study was conducted to analyze the genetic mechanism of accumulation slopes, which are formed due to fracture cutting and weathering. In-situ testing and numerical analysis were carried out to study the deformation characteristics of the accumulation body, revealing that deformation primarily occurs inside the body and can be divided into three zones.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Engineering, Chemical
Qiaolin He, Shuwen Yang, Wenxiang He, Yong Hu, Tong Wang, Xiaoyang Gao
Summary: This study investigated the seismic response variability of the deeply buried Baxigai Formation using seismic forward modeling and amplitude attribute extraction methods. The distribution patterns of sandstone and mudstone reservoirs in different vertical combinations were revealed, which is of significant importance for oil and gas exploration.
Article
Geochemistry & Geophysics
Xuan Zhang, Chun Zhu, Zinan Li, Wansheng Ling, Faming Zhang
Summary: This research focused on the Langjia landslide in Qinghai Province of China to explore the failure mechanism and mode of deep relaxation rockslide in cold and arid areas of the plateau. The main precondition for the landslide was found to be deep relaxation tension cracks, triggered by strong weathering and disintegration of argillaceous cemented conglomerate on the sliding surface. The influence of rainfall, snow melting, and temperature accelerated the development of cracks and weathering process, leading to the formation of a sliding surface of mud rock with gravel.
Article
Geosciences, Multidisciplinary
Huan Wang, Kaibo Shi, Yongsheng Ma, Bo Liu, Xinmin Song, Yuzhu Ge, Hangyu Liu, Rene Hoffmann, Adrian Immenhauser
Summary: The study on Mishrif carbonates in the Central Mesopotamian Basin of Iraq shows a wide range of rock fabrics and diagenetic features that impact reservoir quality and flow properties. A homoclinal ramp geometry model with twelve microfacies types is proposed, showing low-energy conditions in the ramp. Two main diagenetic features shape reservoir properties, including early diagenetic dissolution and preferential cementation, leading to distinctive reservoir qualities.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Zhang Han, Chen JianKang, Kou Qing Jian, Pei Liang, Huang Huibao
Summary: The proposed method in this paper provides a fast prediction of the safety state of reservoir bank rock slope based on time-dependent deformation and rock creep, allowing for online forecasting of stability and reliability coefficients using deformation data. Verification on a left bank slope of the Dagangshan arch dam showed that the method met engineering requirements with errors within 5% for slope stability safety coefficient prediction and within 10% for reliability index prediction. This method offers a new way for rapid prediction of slope engineering safety.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Engineering, Geological
Yifei Zhu, Xin Yao, Leihua Yao, Zhenkai Zhou, Kaiyu Ren, Lingjing Li, Chuangchuang Yao, Zhenkui Gu
Summary: This paper studies the Xingguang village landslide using ascending and descending track interferometric synthetic aperture radar observation results and two-dimensional decomposition functions, combined with geomorphological data, stratigraphic occurrence, and lithological characteristics. The study identifies the internal factors responsible for the development of the landslide and proposes a new technical path to obtain the direction of landslide movement and identify rock toppling through time-series cumulative displacement maps and stratigraphic information.
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
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
Environmental Sciences
Liangfu Xie, Jiabing Zhang, Yongjun Qin, Jianhu Wang, Wei Qiao, Jiangu Qian
Summary: This paper investigates the impact of reservoir level fluctuations on the stability of reverse-dip rock slopes based on field monitoring data. It analyzes the deformation evolution characteristics of a typical slope under different geological partitions considering the fluctuation of reservoir level. The results show an increase in zones with strong deformation as the reservoir level changes.
ENVIRONMENTAL EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
Sherif Farouk, Khaled Al-Kahtany, Mohamed Tawfik
Summary: High-resolution sequence stratigraphy of mixed siliciclastic-carbonate rocks in the Coniacian-Campanian succession in Sinai (Egypt) was derived through analysis of biostratigraphy, facies types and distribution, lithofacies associations, and bounding surfaces. The study identified multiple foraminiferal species, facies associations, and sequence boundaries, indicating simultaneous eustatic and tectonic effects in Egypt and surrounding countries.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Energy & Fuels
Nathalia Tessarolo, Nan Wang, Chrissie Wicking, Ian Collins, Kevin Webb, John Couves, Jonathan Crouch, Colm Durkan, Huang Zeng
Summary: The study reveals the importance of nitrogen-containing species with sticky properties in enhancing oil recovery from carbonate reservoir rocks, contrary to previous assumptions. Understanding the molecular composition of organic material on rock surfaces is crucial for designing effective enhanced oil recovery methods. Adsorption of positively charged organic molecules onto mineral surfaces supports the dominance of basic N-containing molecules in controlling the wetting state of carbonate reservoir rock.
Article
Geosciences, Multidisciplinary
Irene Aubert, Hugues Bitault, Philippe Leonide, Francois Fournier, Nicolas Godeau, Juliette Lamarche, Pierre Deschamps, Rodrigo S. Maia Correa, Lionel Marie
Summary: This study investigates the diagenetic evolution of carbonate rocks affected by a normal fault, through analyzing the diagenetic properties and distribution of cements. The results show that most diagenetic alterations occurred prior to the OligoAquitanian stage, and the fault-related alteration is limited to one stratigraphic unit, extending up to 700 meters from the fault surface.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Masoud Aali, Bill Richards, Mladen R. Nedimovic, Vittorio Meselli, Martin R. Gibling
Summary: Seismic and sequence stratigraphic analyses are important for interpreting coastal and shallow-marine deposits, but traditional methods may have limitations. The development of a geometrical analysis approach provides a more precise way to identify stacking patterns and enhance understanding of stratigraphic structures.
Article
Medicine, Research & Experimental
Xiaojun Liu, Jinghai Gao, Jing Wang, Jing Chu, Jiahao You, Zhijun Jin
Summary: Long non-coding RNA (lncRNA) plays a key role in regulating cancers, but its specific role in ovarian cancer subpopulations is still largely unknown. Through RNA-sequencing and clinical data analysis, two molecular subtypes of ovarian cancer were identified, with significant prognostic differences and distinct immunological characteristics.
EXPERIMENTAL BIOLOGY AND MEDICINE
(2021)
Article
Geosciences, Multidisciplinary
Huang Xiaowei, Jin Zhijun, Liu Quanyou, Meng Qingqiang, Zhu Dongya, Liu Jiayi, Liu Jinzhong
Summary: Through experiments on post-mature kerogen samples from the Yurtus Formation in the Tarim Basin, it was found that hydrogen and catalysts from deep-derived fluids have significant catalytic hydrogenation effects on organic-rich matter, increasing hydrocarbon generation efficiency and potential in post-mature source rocks.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Energy & Fuels
Xinping Liang, Qiuyang Zhao, Yu Dong, Liejin Guo, Zhijun Jin, Quanyou Liu
Summary: The study found that temperature and time are the dominant factors affecting gas yield and selectivity, with increasing temperature promoting endothermic reactions and accelerating the water-gas shift reaction. Pressure increase has a less negative but negligible effect on gasification. In general, carbon gasification efficiency and hydrogen selectivity first increase and then stabilize when the reaction time is prolonged, and the water-shale mass ratio is increased and (or) the shale particle size is decreased.
Article
Geochemistry & Geophysics
Tao Jiang, Zhijun Jin, Zongquan Hu, Wei Du, Zhongbao Liu, Jianhua Zhao
Summary: The study investigated the types and characteristics of organic pores in shale formations, revealing that organic pores are mainly concentrated in highly matured shale with three main types: algae, graptolite, and pyrobitumen. The connectivity of organic pores is better in shale with high organic content, which plays a crucial role in shale gas migration.
Article
Geosciences, Multidisciplinary
Quanyou Liu, Peng Li, Zhijun Jin, Xinping Liang, Dongya Zhu, Xiaoqi Wu, Qingqiang Meng, Jiayi Liu, Qi Fu, Jianhua Zhao
Summary: The study highlights the significant impact of sulfate reduction on organic matter preservation, with higher SRI values leading to extensive organic matter consumption and lower SRI values resulting in minimal degradation effects.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geochemistry & Geophysics
Guanping Wang, Zhijun Jin, Zongquan Hu, Guangxiang Liu, Tong Zhu, Wei Du, Hongliang Wang, Jing Wu
Summary: This study investigated the fine-grained deposition and evolution characteristics of the Wufeng-Longmaxi shales, key targets for Chinese shale gas exploration. The research accurately identified favorable lithofacies for shale gas exploration and discussed the differential evolution of lithofacies in the sedimentary system tract. The study is significant for further exploration of marine shale and improvement of the theory of shelf fine-grained sedimentary systems.
Article
Geochemistry & Geophysics
Huiyuan Xu, Quanyou Liu, Dongya Zhu, Qingqiang Meng, Zhijun Jin, Qi Fu, Simon C. George
Summary: Laboratory experiments have established hydrothermal organic reactions in the presence of mineral catalysts, but little is known about hydrothermal catalytic conversion (HTCC) and the existence of complex molecules in continental hydrothermal systems. Evidence from natural subsurface samples shows a wide range of mineral catalysis of polycyclic aromatic compounds, with a stepwise interaction of organic compounds with metal bearing hydrothermal fluids. This study suggests that various phenyl/sulfur/oxygen-containing compounds are metastable equilibrium products of complex redox reactions under specific hydrothermal conditions.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geosciences, Multidisciplinary
Dong Guo, Zhijun Jin
Summary: Located in the SW part of the Bohai Bay Basin, the Dongpu Sag is rich in oil and gas, with the main source rock found in the third member (Es3) of the Middle Eocene Shahejie Formation. Due to the complex geology of the area, the stratigraphic subdivision and deposition timing of each member and sub-member in the Shahejie Formation is challenging and controversial. By establishing a high-resolution cyclostratigraphic framework, the study provides a more precise time interval to locate the effective source rocks in the sag and allows for fine-scale stratigraphic correlation within the region and beyond.
JOURNAL OF ASIAN EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
Xiaoping Liu, Zhijun Jin, Jin Lai, Xuechun Fan, Ming Guan, Honglin Shu, Gaocheng Wang, Mengcai Liu, Yufeng Luo
Summary: Fluorescence thin section and SEM were used to analyze pore spaces of oil shales, while NMR T-2 spectra and fractal analysis were applied to investigate pore size distribution and fractal dimensions. The results showed the complex pore assemblages in oil shales and the correlation between fractal dimensions and NMR parameters.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Juye Shi, Zhijun Jin, Quanyou Liu, Tan Zhang, Tailiang Fan, Zhiqian Gao
Summary: Exploration of shale oil in China has shown that laminated shales are favorable lithofacies for effective shale oil production. A study on Paleogene organic-rich shales in the Dongying Sag, Bohai Bay Basin revealed two categories and six types of laminar structures, with those having high laminar continuity exhibiting better reservoir and oil-bearing properties compared to those with poor continuity. Shales with thick parallel and wavy laminar structures were found to have favorable petrophysical parameters for shale oil exploration in the area.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Energy & Fuels
Gang Zhao, Zhijun Jin, Wenlong Ding, Guangxiang Liu, Jinbiao Yun, Ruyue Wang, Guanping Wang
Summary: The study on fractures in the Wufeng-Longmaxi Formation in Hunan Province reveals that these fractures can be divided into different types based on their combination characteristics and roughness. The fractures mainly occurred in the late Yanshanian-Himalayan period and experienced repeated processes of splitting, healing, and re-splitting. The gas migration and enrichment in these fractures play a key role in the distribution and preservation of shale gas.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Review
Geosciences, Multidisciplinary
Quanyou Liu, Peng Li, Zhijun Jin, Yuewu Sun, Guang Hu, Dongya Zhu, Zhenkai Huang, Xinping Liang, Rui Zhang, Jiayi Liu
Summary: The study focused on the impact of volcanic activity on paleoproductivity and preservation conditions in lacustrine shale formation. The results indicated that volcanic activity enhanced ancient productivity and promoted organic matter preservation.
SCIENCE CHINA-EARTH SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
Ming Guan, Xiaoping Liu, Zhijun Jin, Jin Lai, Jie Liu, Biao Sun, Tian Liu, Zuxian Hua, Wen Xu, Honglin Shu, Gaocheng Wang, Mengcai Liu, Yufeng Luo
Summary: The heterogeneity and lack of proper parameters in lacustrine shale oil occurrences hinder the assessment of shale oil reserves. This study characterized shale oil content using petroleum compositional characteristics and determined its spatial occurrence. The controlling factors of shale oil content were also discussed. This work has implications for optimizing exploration targets and evaluating resource potential.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Energy & Fuels
Xiao-Ping Liu, Ming Guan, Zhi-Jun Jin, Zhe Cao, Jin Lai, Lun-Ju Zheng, Wen-Qi Li, Biao Sun, Shan-Yong Chen
Summary: Pyrolysis experiments were conducted on lacustrine organic-rich shale to investigate the impact of hydrocarbon generation on shale pore structure evolution. The results show that thermal evolution controls the transformation of organic matter, characteristics of hydrocarbon products, and changes in pore structure.
Article
Energy & Fuels
Jin Zhijun, Zhu Rukai, Liang Xinping, Shen Yunqi
Summary: The article compared the geological and engineering characteristics of shale oil reservoirs between China and the United States, and proposed 8 issues worthy of attention in the exploration and development of lacustrine shale oil in China. In the future, further research is needed on key scientific issues such as terrestrial fine-grained sediment deposition processes, diagenesis-hydrocarbon generation mechanisms, and shale layer fracturing mechanisms.
PETROLEUM EXPLORATION AND DEVELOPMENT
(2021)