Wei Zhang

Southern University of Science and Technology

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Jinqiang Liang

Guangzhou Marine Geological Survey

Pibo Su

China Geological Survey

Wei Huang

Sichuan University

Jiangong Wei

Guangzhou Marine Geological Survey

Zhifeng Wan

Sun Yat-sen University

Jian‐Liang Ye

Xiamen University

Jialu Ni

Research Institute of Petroleum Exploration and Development

Gansheng Yang

Ministry of Natural Resources

Kaihua Yang

China University of Geosciences

Wenjian Zhu

Zhejiang A & F University

Cooperative Institutions

Chinese Academy of Sciences

115

China Geological Survey

Ministry of Natural Resources

Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)

Guangzhou Marine Geological Survey

University of Chinese Academy of Sciences

China University of Geosciences

Research Institute of Petroleum Exploration and Development

Chinese Academy of Geological Sciences

Sun Yat-sen University

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Geochemical characteristics and genesis of the Yanchang Formation terrestrial shale gas in the Yanchang exploration area

DOAJ (DOAJ: Directory of Open Access Journals) (2017)

Hongwei Xu Xianqing Li Zhou Bao-gang Jie Yang Wei Zhang

Shale Gas

Source

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Citations (2)

Technical Economical Analysis

Springer geology (2015)

Da Wang Wei Zhang Xiaoxi Zhang Guolong Zhao Ruqiang Zuo

Coring

10.1007/978-3-662-46557-8_12

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Citations (1)

Sweet spots evaluation and exploration of lacustrine shale oil of the 2nd member of Paleogene Kongdian Formation in Cangdong sag, Dagang Oilfield, China

石油勘探与开发 (2021)

Han Wenzhong Xianzheng Zhao Fengming Jin Xiugang Pu Chen Shiyue

Paleogene

Shale Gas

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Citations (0)

Geological and geophysical features of and controls on occurrence and accumulation of gas hydrates in the first offshore gas-hydrate production test region in the Shenhu area, Northern South China Sea

Marine and Petroleum Geology (2019)

Wei Zhang Jinqiang Liang Jiangong Wei Jingan Lu Pibo Su

Clathrate hydrate

10.1016/j.marpetgeo.2019.104191

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Citations (135)

Research of Forest Fire Points Detection Method Based on MODIS Active Fire Product

Jie Wang Guanghui Wang Jianwei Qi Liu Yu Wei Zhang

Forest fire is a common natural disaster, which has a great threat to ecological and human life safety. Compared with the traditional monitoring method, Satellite remote sensing can provide more timely and large-area monitoring in the process of early detection, dynamic tracking, and disaster assessment of forest fires. This paper proposed a forest fire detection method based on MODIS active fire products, by adding Normalized vegetation index (NDVI), slope, elevation, and other factors as identification conditions. To verify the reliability of the proposed method, this paper used the MODIS active fire products data in China in July 2018, the identification accuracy was up to 88.94%, and the missing detection rates were only 4.25%, the error was mainly due to the low spatial resolution of MODIS data. The validation results showed that the overall accuracy of the proposed method was very satisfactory, which can meet the real-time early warning of a forest fire. Moreover, taking a forest fire that occurred in Qinyuan County, Shanxi Province as an example, the paper analyzed how to use the identified forest fire points to monitor the fire and make fire-fighting plans, which proved that using the fire points data can provide scientific bases for forest fire monitoring and extinguishing.

Fire Detection

Elevation (ballistics)

10.1109/ieeeconf54055.2021.9687646

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Citations (6)

Drilling Engineering Design

Springer geology (2015)

Wang Da Wei Zhang Xiaoxi Zhang Guolong Zhao Ruqiang Zuo

Scientific drilling

Drilling engineering

10.1007/978-3-662-46557-8_2

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Citations (2)

Correlation of Critical State Strength Properties with Particle Shape and Surface Fractal Dimension of Clinker Ash

International Journal of Geomechanics (2021)

Yang Wu Jie Cui Jinsheng Huang Wei Zhang Norimasa Yoshimoto

Clinker ash is a byproduct obtained from coal-fired electrical generators. It is a type of recycled granular material with a complex particle shape and large surface roughness. Particle shape descriptors and surface fractal dimensions are effective parameters to quantify sand grain morphologies. A simple image analysis approach is employed to determine the aspect ratio, sphericity, roundness, and convexity of 12 types of clinker ash collected from thermal power plants distributed on the western island of Japan. Compared to the majority of sands with other mineralogical components, clinker ash particles have a smaller aspect ratio, sphericity, and roundness. Under similar test conditions, clinker ash exhibits higher shear resistance than natural sands at the critical state. Critical state friction angles tend to decrease with increasing aspect ratio, sphericity, roundness, and convexity. A decreased aspect ratio, roundness, and convexity enhance the slope and intercept of critical state lines in the void ratio and mean stress plane. The mean regularity, which is the average of four particle shape descriptors, is regarded as an effective index to characterize the shear strength of clinker ash at the critical state. The surface fractal dimension could also be decided from digital image analysis. The results also show that the critical state friction angle is well correlated with the surface fractal dimension for different types of clinker ash. The implication is that a rougher surface texture hinders the rotation, frustration, and interlocking of particles at the critical state, resulting in higher shear resistance.

Sphericity

Roundness (object)

Void ratio

10.1061/(asce)gm.1943-5622.0002027

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Citations (73)

Urban geophysical exploration: case study in Chengdu International Bio-City

Journal of Geophysics and Engineering (2023)

Liang Wang Hua Li Donghui Wang Sheng Zhou Wei Zhang

Abstract Understanding the shallow geological structure of urban areas is crucial for effective planning and development of underground spaces. Geophysical methods that are well-suited for site-specific investigation and have robustly anti-interference capabilities can provide important geological information for urban areas. In support of investigating the 3D geological structure of the shallow subsurface in Chengdu International Bio-City, a geophysical exploration study was conducted using three methods: the electrical resistivity tomography (ERT), micro-seismic exploration and opposing-coil transient electromagnetic method (OCTEM). Results from the study showed that the ERT method was greatly affected by local high-resistance bodies, construction sites and industrial currents, therefore leading to poor detection results that did not match well with the area’s layered structure characteristics. The micro-seismic exploration method showed good layering effects and correlation with the drilling data in the elevation range of ∼350 to 436 m, but poor layering effects and low correlation with drilling data in the elevation range of ∼235 to 350 m, with relatively slow construction efficiency. The OCTEM showed good correlation with the drilling data for shallow depths up to 200 m and good identification capabilities for gypsum and mudstone in the area. Additionally, the instrument’s anti-interference ability was suitable for complex urban conditions. Thus, OCTEM was selected for the area-based exploration with a 100 × 10 m grid, rapidly obtaining 3D resistivity information for depths up to 200 m in the study area. By integrating the 3D resistivity information with known engineering geological information, a comprehensive 3D geological model of the study area was created.

Layering

Electrical Resistivity Tomography

Elevation (ballistics)

Exploration geophysics

10.1093/jge/gxad049

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Citations (4)

E2LLM: Encoder Elongated Large Language Models for Long-Context Understanding and Reasoning

arXiv (Cornell University) (2024)

Zihan Liao Jun Wang Hang Yu Lingxiao Wei Jianguo Li

In the realm of Large Language Models (LLMs), the ability to process long contexts is increasingly crucial for tasks such as multi-round dialogues, code generation, and document summarization. This paper addresses the challenges of enhancing the long-context performance, reducing computational complexity, and leveraging pretrained models collectively termed the "impossible triangle." We introduce E2LLM (Encoder Elongated Large Language Models), a novel approach that effectively navigates this paradox. The method involves splitting long contexts into chunks, compressing each into embedding vectors via a pretrained text encoder, and utilizing an adapter to align these representations with a decoder-only LLM. Two training objectives, focusing on reconstruction of the encoder output and long-context instruction fine-tuning, are employed to facilitate the understanding of soft prompts by the LLM. Experimental results demonstrate that E2LLM achieves superior performance in long-context scenarios while balancing efficiency, performance, and compatibility with pretrained models. Our framework thus represents a significant advancement in the field, contributing to effective long-text modeling.

10.48550/arxiv.2409.06679

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Characterization of gas accumulation at a venting gas hydrate system in the Shenhu area, South China Sea

Interpretation (2021)

Jinqiang Liang Zijian Zhang Jingan Lu Yiqun Guo Zhibin Sha

Bottom-simulating reflections (BSRs) in seismic data have been widely accepted to indicate the base of the methane gas hydrate stability zone (MGHSZ), and free gas was thought to exist only below it. However, real geologic systems are far more complex. We have evaluated the results of 3D seismic, logging while drilling, in situ, and coring measurements at a venting gas hydrate system in the Shenhu area of the South China Sea. Our studies reveal that free gas has migrated upward through the thermogenic gas hydrate stability zone into the MGHSZ and become a part of the gas hydrate system. Seismic amplitude anomalies and core results suggest the presence of free gas above the base of MGHSZ at 165 mbsf and the presence of thermogenic gas hydrates below it in well SC-W01. Analyses of P-wave velocity, S-wave velocity, density, and porosity logs reveal that free gas occurs above and below the MGHSZ as well. Integrating log and core analysis with seismic interpretation suggests that the variation in seismic amplitude within the chaotic zone is associated with variable gas saturations, and a large amount of methane and thermogenic gases accumulate near the complex BSRs. We suggest that relative permeability likely plays a significant role in the free-gas distribution and the formation of gas hydrates within a venting gas hydrate system, whereas the effect of dissolved gas short migration is not ignored. Our results have important implications for understanding the accumulation and distribution of gas hydrates and free gas in the venting gas hydrate system and seeps at the seafloor.

Clathrate hydrate

Coring

10.1190/int-2020-0105.1

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Citations (12)