Li Wan

China University of Geosciences (Beijing)

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Xu‐Sheng Wang

Guangxi University of Chinese Medicine

Xiao‐Wei Jiang

China University of Geosciences (Beijing)

Hailong Li

Southern University of Science and Technology

Jun‐Zhi Wang

Yellow River Institute of Hydraulic Research

Fusheng Hu

China University of Geosciences (Beijing)

Deqiang Mao

Shandong University

Jet‐Chau Wen

Inner Mongolia Autonomous Region Meteorological Bureau

Kuo‐Chin Hsu

National Cheng Kung University

Tian‐Chyi Jim Yeh

University of Arizona

Xuejing Wang

Tianjin University

Cooperative Institutions

China University of Geosciences (Beijing)

Chinese Academy of Sciences

China University of Geosciences

Ministry of Natural Resources

Sun Yat-sen University

Tsinghua University

Huazhong University of Science and Technology

China Geological Survey

University of Chinese Academy of Sciences

Ministry of Education of the People's Republic of China

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Lake-Level-Fluctuation Control on Shale Oil Enrichment of the Salinized Lacustrine Organic-Rich Shale in the Paleogene Biyang Depression, East China

Minerals (2024)

Yu Song Li Wan Shilin Xu Bo Gao Chuang Li

The paleolake level, which is controlled by the moisture balance (precipitation minus evaporation) within the lake basin, is a significant factor in determining the deposition of lacustrine organic-rich shale (LORS) across geological time, and hence influences shale oil enrichment. However, the impact of lake-level-fluctuations on shale oil enrichment of LORS is not well understood. Based on an integration of bulk geochemistry, organic petrography, pyrolysis gas chromatography, and element compositions, we address this issue using the Paleogene Biyang Depression in East China as an example. High lake levels, combined with anoxic–suboxic conditions, brackish–saline water, high productivity, and low detrital influx, are favorable for LORS deposition, which is characterized by a large distribution area and thickness, a high potential for oil generation and emplacement, and a high free shale oil content. In contrast, LORS deposited during low lake levels, with suboxic–dysoxic conditions, fresh–brackish water, low productivity, and high detrital influx, has a small distribution area and thickness, a low potential for oil generation and emplacement, and a low free shale oil content (a comparable maturity was present in all the studied LORS). Our data suggests that the elevated lake level led to higher salinity, stronger reduction conditions, higher productivity, and lower clastic inflow in the paleolake, forming LORS with higher shale oil potential. It has a positive effect on shale oil enrichment of LORS. The findings are also applicable to regional shale oil exploration.

10.3390/min14010094

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Citations (2)

A view toward the future of subsurface characterization: CAT scanning groundwater basins

Water Resources Research (2008)

Tian‐Chyi Jim Yeh Cheng‐Haw Lee Kuo‐Chin Hsu Walter A. Illman Warren Barrash

In this opinion paper we contend that high‐resolution characterization, monitoring, and prediction are the key elements to advancing and reducing uncertainty in our understanding and prediction of subsurface processes at basin scales. First, we advocate that recently developed tomographic surveying is an effective and high‐resolution approach for characterizing the field‐scale subsurface. Fusion of different types of tomographic surveys further enhances the characterization. A basin is an appropriate scale for many water resources management purposes. We thereby propose the expansion of the tomographic surveying and data fusion concept to basin‐scale characterization. In order to facilitate basin‐scale tomographic surveys, different types of passive, basin‐scale, CAT scan technologies are suggested that exploit recurrent natural stimuli (e.g., lightning, earthquakes, storm events, barometric variations, river‐stage variations, etc.) as sources of excitations, along with implementation of sensor networks that provide long‐term and spatially distributed monitoring of excitation as well as response signals on the land surface and in the subsurface. This vision for basin‐scale subsurface characterization faces many significant technological challenges and requires interdisciplinary collaborations (e.g., surface and subsurface hydrology, geophysics, geology, geochemistry, information and sensor technology, applied mathematics, atmospheric science, etc.). We nevertheless contend that this should be a future direction for subsurface science research.

Characterization

10.1029/2007wr006375

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Citations (49)

Necessary conditions for inverse modeling of flow through variably saturated porous media

Advances in Water Resources (2012)

Deqiang Mao Tian-Chyi Jim Yeh Li Wan Kuo‐Chin Hsu Cheng-Haw Lee

Hydraulic head

Pressure head

Richards equation

10.1016/j.advwatres.2012.08.001

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Citations (49)

A cross-sectional survey of first-aid kit equipment in a family in Sichuan, China

BMC Public Health (2024)

Dan Wen Li Wan Haiyan He Qianmei Zhong Q. Jiang

To examine residents' first-aid kit preparation and its influencing factors.

Cross-sectional study

Biostatistics

Preparedness

Health Literacy

First aid

Questionnaire

Family income

10.1186/s12889-024-19376-y

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Citations (0)

Evaluation of depth-dependent porosity and bulk modulus of a shear using permeability–depth trends

International Journal of Rock Mechanics and Mining Sciences (2009)

Xu‐Sheng Wang Xiao‐Wei Jiang Li Wan Guang‐Ling Song Qiang Xia

Shear modulus

10.1016/j.ijrmms.2009.02.002

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Citations (46)

Protection of Program Integrity Based on Trusted Computing

Xiang Ling Li Wan Guoqing Wu

Trusted computing has a static solution to protect the system from the threats of incredible program. But few techniques could help to secure those integrities of running programs. This article extends Biba model with the access of execution, proposes integrity protection framework based on trusted platform, and discusses the application of integrity protection on architectures of mainstream platforms.

Trusted Network Connect

Trusted Platform Module

Direct Anonymous Attestation

Data integrity

Trusted computing base

10.1109/nswctc.2010.200

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Citations (1)

A revisit of drawdown behavior during pumping in unconfined aquifers

Water Resources Research (2011)

Deqiang Mao Li Wan Tian‐Chyi Jim Yeh Cheng‐Haw Lee Kuo‐Chin Hsu

In this study, the S‐shaped log‐log drawdown‐time curve typical of pumping tests in unconfined aquifers is reinvestigated via numerical experiments. Like previous investigations, this study attributes the departure of the S shape from the drawdown‐time behavior of the confined aquifer to the presence of an “additional” source of water. Unlike previous studies, this source of water is reinvestigated by examining the temporal and spatial evolution of the rate of change in storage in an unconfined aquifer during pumping. This evolution is then related to the transition of water release mechanisms from the expansion of water and compaction of the porous medium to the drainage of water from the unsaturated zone above the initial water table and initially saturated pores as the water table falls during the pumping of the aquifer. Afterward, the 1‐D vertical drainage process in a soil column is simulated. Results of the simulation show that the transition of the water release mechanisms in the 1‐D vertical flow without an initial unsaturated zone can also yield the S‐shaped drawdown‐time curve as in an unconfined aquifer. We therefore conclude that the transition of the water release mechanisms and vertical flow in the aquifer are the cause of the S‐shaped drawdown‐time curve observed during pumping in an unconfined aquifer. We also find that the moisture retention characteristics of the aquifer material have greater impact than its relative permeability characteristics on the drawdown‐time curve. Furthermore, influences of the spatial variability of saturated hydraulic conductivity, specific storage, and saturated moisture content on the drawdown curve in the saturated zone are found to be more significant than those of other unsaturated properties. Finally, a cross‐correlation analysis reveals that the drawdown at a location in a heterogeneous unconfined aquifer is mainly affected by local heterogeneity near the pumping and observation wells. Applications of a model assuming homogeneity to the estimation of aquifer parameters as such may require a large number of observation wells to obtain representative parameter values. In conclusion, we advocate that the governing equation for variably saturated flow through heterogeneous media is a more appropriate and realistic model that explains the S‐shaped drawdown‐time curves observed in the field.

Aquifer test

Drawdown (hydrology)

Specific storage

Cone of depression

10.1029/2010wr009326

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Citations (38)

Measuring in situ vertical hydraulic conductivity in tidal environments

Advances in Water Resources (2014)

Xuejing Wang Hailong Li Jinzhi Yang Li Wan Xu‐Sheng Wang

Finite difference

Slug test

Hydraulic head

10.1016/j.advwatres.2014.05.004

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Citations (20)

Accumulation, conversion and storage of solute from sinkholes to karst spring under concentrated recharge conditions

Journal of Hydrology (2023)

Jing Chen Mingming Luo Li Wan Jing Wang Yiqun Gan

Sinkhole

10.1016/j.jhydrol.2023.129396

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Citations (7)

Preparation and investigation of the formation mechanism of organic single crystal nanostructures of PTCDA

Acta Physica Sinica (2012)

Han Yu-Yan Liang Cao Xu Fa-Qiang Chen Tie-Xin Zhiyuan Zheng

Different types of nanostructures of an organic dye compound, perylene-3,4,9,10-tetracarboxylic-dianhydride (PTCDA), are prepared on anodic alumina oxide (AAO) at different values of substrate temperature (Ts) by a facile physical vapor deposition (PVD) method in a molecular beam epitaxy (MBE) system. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED) techniques are applied to the systematical characterization of the nanostructures. It is found that the PTCDA nanofibers, nanoneedles, nanobelts, and nanorods are produced at 330 ℃Ts; Only nanorods are formed at 280 ℃, 230 ℃, and 180 ℃, and their lengths become short asTs decreases; the continuous films are obtained on 50 ℃ AAOs substrates. HRTEM and SAED results show that the nanoneedle and nanorods are of single crystal. According to SEM results, the formation of PTCDA nanostructures should be mainly affected by surface curvature andTs.

Selected area diffraction

Nanorod

Nanoneedle

10.7498/aps.61.078103

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Citations (1)