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Identification of the non-stationarity of extreme temperature events and teleconnections with solar activity and large-scale atmospheric circulation: A case study in the Yangtze River Economic Belt

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Journal of Earth Science 2024年

作者： Lin Zhang Jingyun Ling Shengzhi Huang Hongbin Zhan Yi Wu menggui Jin Qiang Huang State Key Laboratory of Eco-hydraulics in Northwest Arid Region， Xi'an university of Technology college of Design and Engineering， National university of Singapore Yinshanbeilu Grassland Eco-Hydrology National Observation and Research station， China Institute of Water Resources and Hydropower Research department of geology and geophysics， texas a&m university， college station School of Earth System Science， Tianjin university School of Environmental Studies， China university of Geosciences

In recent decades， extreme climate events have become a major problem worldwide. To understand the uncertainty in the response of extreme events to global warming， regional assessments are required for various climatic and geographic regions. The spatiotemporal distribution of extreme temperature events in the Yangtze River Economic Belt (YREB) from 1960 to 2019， including interannual changes and their teleconnections with solar activity and large-scale atmospheric circulation， were analyzed using eight indices of extreme temperature events. Over the past six decades， the climate in the YREB region has seen a warming trend， characterized by an increase in extreme warm events and a decrease in extreme cold events. The extreme temperature indices exhibit strong spatial variability. The warm extremes display a significant upward trend across the YREB， while cold extremes are primarily concentrated in the western part of the region. In recent decades， both warm and cold extremes have significant interannual variations， and these events predominantly oscillate over periods of less than four years. After 1985， the relationship between El Ni?o-Southern Oscillation (ENSO)， Arctic Oscillation (AO)， Pacific Decadal Oscillation (PDO) and extreme temperature events has changed significantly compared with pre-1985， and the direction of the phase angle can determine the positive and negative effects of the two time-series. ENSO， AO and PDO mainly have positive impacts on extreme temperature events， with ENSO and AO exerting greater impacts than PDO. In contrast， solar activity mainly has a negative impact on these events. Furthermore， the notable interdecadal changes in extreme temperature events， especially warm extremes， may be caused by the shift in the PDO phase. Therefore， the results of the study are important for the YREB region to take effective measures to mitigate the potential impacts of human activities on regional warming.

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Array processing-a new method to detect and correct errors on array resistivity logging tool measurements

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Chinese Journal of Oceanology and Limnology 2007年第1期25卷 51-58页

作者： Philip D. RABINOWITZ Zhiqiang ZHOU department of geology and geophysics texas A＆m university College Station Texas USA

In recent years more and more multi-array logging tools, such as the array induction and the array lateralog, are applied in place of conventional logging tools resulting in increased resolution, better radial and vertical sounding capability and other features. multi-array logging tools acquire several times more individual measurements than conventional logging tools. In addition to new information contained in these data, there is a certain redundancy among the measurements. The sum of the measurements actually composes a large matrix. Providing the measurements are error-free, the elements of this matrix show certain consistencies. Taking advantage of these consistencies, an innovative method is developed to detect and correct errors in the array resistivity logging tool raw measurements, and evaluate the quality of the data. The method can be described in several steps. First, data consistency patterns are identified based on the physics of the measurements. Second, the measurements are compared against the consistency patterns for error and bad data detection. Third, the erroneous data are eliminated and the measurements are re-constructed according to the consistency patterns. Finally, the data quality is evaluated by comparing the raw measurements with the re-constructed measurements. The method can be applied to all array type logging tools, such as array induction tool and array resistivity tool. This paper describes the method and illustrates its application with the High Definition Lateral Log （HDLL, Baker Atlas） instrument. To demonstrate the efficiency of the method, several field examples are shown and discussed.

关键词： array processing array resistivity logging tool error

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A new shear rheological model for a soft interlayer with varying water content

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Water Science and Engineering 2018年第2期11卷 131-138页

作者： Chong ma Hong-bin Zhan Wen-min Yao Hua-zhou Li School of mathematics and Physics China University of Geosciences Faculty of Engineering China University of Geosciences department of geology and geophysics Texas A&M University College Station

The rheological behavior of a soft interlayer is critical to understanding slope stability, which is closely related to the water content of the soft interlayer. This study used the soft interlayer of the Permian maokou Formation in Southwest China as an example to perform ring shear creep tests with different water content amounts. The effect of water content on the creep properties of the soft interlayer was analyzed, and a new shear rheological model was established. This research produced several findings. First, the ring shear creep deformation of the soft interlayer samples varied with the water content and the maximum instantaneous shear strain increment occurred near the saturated water content. As the water content increased, the cumulative creep increment of the samples increased. Second, the water content significantly affected the long-term strength of the soft interlayer, which decreased with the increase of water content, exhibiting a negative linear correlation. Third, a constitutive equation for the new rheological model was derived, and through fitting of the ring shear creep test data, the validity and applicability of the constitutive equation were proven. This study has developed an important foundation for studying the long-term deformation characteristics of a soft interlayer with varying water content.

关键词： Soft interlayer Ring shear creep test Rheological constitutive model Water content

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Deep soil water recharge response to precipitation in mu Us Sandy Land of China

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Water Science and Engineering 2018年第2期11卷 139-146页

作者： Yi-ben Cheng Hong-bin Zhan Wen-bin Yang Fang Bao School of Soil and Water Conservation Beijing Forestry University Institute of Desertification Studies Chinese Academy of Forestry department of geology & geophysics Texas A&M University College Station

Soil water is the main form of water in desert areas, and its primary source is precipitation, which has a vital impact on the changes in soil moisture and plays an important role in deep soil water recharge(DSWR) in sandy areas. This study investigated the soil water response of mobile sand dunes to precipitation in a semi-arid sandy area of China. Precipitation and soil moisture sensors were used to simultaneously monitor the precipitation and the soil water content(SWC) dynamics of the upper 200-cm soil layer of mobile sand dunes located at the northeastern edge of the mu Us Sandy Land of China in 2013. The data were used to analyze the characteristics of SWC, infiltration, and eventually DSWR. The results show that the accumulated precipitation(494 mm) from April 1 to November 1 of 2013 significantly influenced SWC at soil depths of 0-200 cm. When SWC in the upper 200-cm soil layer was relatively low(6.49%), the wetting front associated with53.8 mm of accumulated precipitation could reach the 200-cm deep soil layer. When the SWC of the upper 200-cm soil layer was relatively high(10.22%), the wetting front associated with the 24.2 mm of accumulated precipitation could reach the upper 200-cm deep soil layer. Of the accumulated 494-mm precipitation in 2013, 103.2 mm of precipitation eventually became DSWR, accounting for 20.9% of the precipitation of that year. The annual soil moisture increase was 54.26 mm in 2013. Accurate calculation of DSWR will have important theoretical and practical significance for desert water resources assessment and ecological construction.

关键词： mu Us Sandy Land Sandy land DSWR Precipitation Wetting front

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VARIATIONS IN CRUSTAL THICKNESS OF THE KANE TRANSFORm IN THE NORTH ATLANTIC OCEAN

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Chinese Journal of Oceanology and Limnology 2001年第4期19卷 350-360页

作者： Philip D.Rabinowitz 胡延昌 department of geology and geophysics texas Am university College Station

A new approach was taken to investigate the crustal stucture of the Kane transform and its aseismic extension, using high quality bathymetry and gravity data. The gravity signatures associated with variations in crustal thickness of the transform were isolated from the observed free air anomaly, was continued downward to the mean depth of the crust/mantle interface and converted onto the relief on that surface. The crustal thickness of the transform was then calculated by subtracting seawater depth from the depth of the gravity inferred crust/mantle interface.3 D gravity investigation results indicate that the Kane transform and adjacent areas are associated with a crust thinner than normal oceanic crust. The transform trough is largely underlain by a crust less than 4.5km thick and in the nodal basins the crust may be as thin as 3 km. The crust beneath the fracture zone valley is 4-5.5 km thick. The rift valleys on the spreading segments are also characterized by thin crust (4-5 km thick). Thin oceanic crust extends to 20-30 km from the transform axis,except for some localized places such as the inside corner highs adjoining the ridge transform intersections. These gravity inferred results match fairly well with limited published seismic results. Thinning of the crust is mainly attributable to a thin layer 3, which in turn may be explained by the combined effects of reduced magma supply at the ends of the spreading segments and tectonic activities in the region.

关键词： crustal thickness Kane transform high quality bathymetry free air anomaly north Atlantic ocean

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Non-Darcian Flow Toward a Finite-Diameter Vertical Well in a Confined Aquifer

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Pedosphere 2008年第3期18卷 288-303页

作者： WEN Zhang HUANG Guan-Hua ZHAN Hong-Bin college o.f Water Conservancy and Civil Engineering China Agricultural University Beijing 100083 （China） Chinese-Israeli International Center for Research and Training in Agriculture Beijing 100083 （China） department of geology and geophysics Texas A＆M University College Station Texas 77843-3115 （USA）

Non-Darcian radial flow toward a finite-diameter, fully penetrating well in a confined aquifer was analyzed on the basis of the Izbash equation with consideration of the wellbore storage effect. We derived semi-analytical solutions of drawdown by using the Boltzmann transform, and obtained approximate analytical solutions of the drawdown at early and late times. mATLAB programs were developed to facilitate computation of the semi-analytical solutions. The turbulence factor v which was directly related to the pumping rate appeared to have negligible influence upon the wellbore well function at early times, but imposed significant influence at intermediate and late times. However, the turbulence factor v imposed non-negligible influence upon the aquifer well function during the entire pumping period, provided that the observation point was not sufficiently close to the wellbore. Sensitivity analysis indicated that the power index n in the Izbash equation had less influence on the type curves at the face of the pumping wellbore, but had much greater influence upon the well function in the aquifer. As the n values increased, the drawdown in the aquifer decreased at early times and increased at late times. The Boltzmann transformation could only be used in an approximate sense for radial non-Darcian flow problems. This approximation would provide accurate solutions at early times, and introduce small but consistent discrepancies at intermediate and late times for the wellbore well function.

关键词： finite-diameter well non-Darcian flow' type curves well function wellbore storage

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EXPERImENTAL STUDY OF FRICTION FACTOR FOR GROUNDWATER FLOW IN A SINGLE ROUGH FRACTURE

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Journal of Hydrodynamics 2009年第6期21卷 820-825页

作者： CHEN Zhou QIAN Jia-zhong LUO Shao-he ZHAN Hong-bin School of Resources and Environmental Engineering Hefei University of Technology Hefei 230009 China department of Resources and Environment Henan Polytechnic University Jiaozuo 454010 China department of geology and geophysics Texas A and M University College Station TX 77843-3115 USA

To study the relationships between the friction factor f and the flow type in a single rough fracture, the formulae of f for both unconfined and confined flows are deduced based on previous studies. The relationships between f and the Reynolds number （Re） for different relative roughnesses are investigated experimentally. The moody-type diagram, based on the deduced formula of f, is also plotted and the hydraulic characteristics of the flow in a rough fracture are analyzed. Results show that the moody-type diagram of the experiment has a similar distribution to that of the conventional moody diagram. It is found that the value of f in the experiment is much smaller than that of the conventional moody diagram and turbulent flow appears easier for rough fractures, which can be explained by the separation phenomenon in boundary layers. The critical Re ranging from 650 to 700 in rough fractures is concluded based on the experimental results. It also can be concluded that the friction factor f is related not only with the Re and the relative roughness but also with the absolute roughness.

关键词： friction factor rough fracture moody diagram critical Reynolds number ( Re ) boundary layer

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Rock physics model for velocity–pressure relations and its application to shale pore pressure estimation

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Petroleum Exploration and Development 2023年第2期50卷 404-418页

作者： GUO Jingyi LI min ZHUANG mingwei SUN Yuefeng department of geology&geophysics Texas A&M UniversityCollege Station77843United States Southwest Geophysical Research Institute BGPCNPCChengdu 610213China Institute of Electromagnetics and Acoustics Xiamen UniversityXiamen 361005China

Acoustic wave velocity has been commonly utilized to predict subsurface geopressure using empirical *** wave velocity is, however, affected by many factors. To estimate pore pressure accurately, we here propose to use elastic rock physics models to understand and analyze quantitatively the various contributions from these different factors affecting wave velocity. We report a closed-form relationship between the frame flexibility factor(γ) in a rock physics model and differential pressure, which presents the major control of pressure on elastic properties such as bulk modulus and compressional wave velocity. For a gas-bearing shale with abundant micro-cracks and fractures, its bulk modulus is much lower at abnormally high pore pressure(high γ values) where thin cracks and flat pores are open than that at normal hydrostatic pressure(low γ values) where pores are more rounded on average. The developed relations between bulk modulus and differential pressure have been successfully applied to the Upper Ordovician Wufeng and Lower Silurian Longmaxi formations in the Dingshan area of the Sichuan Basin to map the three-dimensional spatial distribution of pore pressure in the shale, integrating core, log and seismic data. The estimated results agree well with field measurements. Pressure coefficient is positively correlated to gas content. The relations and methods reported here could be useful for hydrocarbon exploration, production, and drilling safety in both unconventional and conventional fields.

关键词： pore pressure pressure coefficient acoustic velocity bulk modulus pore structure shale gas Upper Ordovician Wufeng Formation Lower Silurian Longmaxi Formation Sichuan Basin

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modified method for fracability evaluation of tight sandstones based on interval transit time

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Petroleum Science 2020年第2期17卷 477-486页

作者： Jing Li Xiao-Rong Li Hong-Bin Zhan ming-Shui Song Chen Liu Xiang-Chao Kong Lu-Ning Sun college of Pipeline and Civil Engineering China University of Petroleum(East China)Qingdao 266580ShandongChina college of Safety and Ocean Engineering China University of Petroleum(Beijing)Beijing 102249China department of geology and geophysics Texas A&M UniversityCollege StationTX 77843USA Sinopec Shengli Oilfield Company Dongying 257001ShandongChina

Fracability is a property that indicates how easy reservoir rocks can be fractured in hydraulic fracturing *** is a key parameter for fracturing design and *** order to utilize continuous logging data to predict fracability,synchronous tests of dynamic and static mechanical parameters of rocks under different confining pressures were conducted on13 tight sandstone samples derived from the central Junggar Basin,China.A modified formula between dynamic and static mechanical parameters was *** of the tight reservoir in the Junggar Basin was then evaluated based on brittleness index,fracture toughness,and fracability *** effectiveness of fracturing was analyzed combined with the oil testing curve after hydraulic *** results show that:(1)The distribution of oil-bearing formations in the studied area coincides well with stratum of higher fracability index.(2)The critical fracability index is determined to be 0.3,three formations are selected as fracturing candidates,and a thin mudstone interbed is identified in the oil-bearing formation.(3)Well testing curve verifies the reliability of the fracability evaluation method and the accuracy of the modified formula between dynamic and static mechanical *** study provides useful information for improving fracturing operations of tight oil and gas reservoirs.

关键词： Tight sandstone Brittleness index Fracture toughness Fracability index

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Time-Lapse 3-D Seismic Wave Simulation via the Generalized multiscale Finite Element method

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Communications in Computational Physics 2020年第6期28卷 401-423页

作者： Yongchae Cho Richard L.Gibson,Jr. Hyunmin Kim mikhail Artemyev Yalchin Efendiev Shell International Exploration&Production Inc. 150 N Dairy Ashford RoadHoustonTX 77079USA department of geology&geophysics Texas A&M UniversityCollege StationTexas 77843-3115USA Shell Exploration&Production Company 701 Poydras StreetNew OrleansLA 70139USA Arista Networks DublinIreland department of mathematics Texas A&M UniversityCollege StationTexas 77843-3368USA multiscale model Reduction Laboratory North-Eastern Federal UniversityYakutskRepublic of Sakha 677980Russia

Numerical solution of time-lapse seismic monitoring problems can be challenging due to the presence of finely layered *** wave modeling using fine layered meshes also adds more computational *** approaches such as finite difference and finite element methods may be prohibitively expensive if the whole domain is discretized with the cells corresponding to the grid in the reservoir subdomain.A common approach in this case is to use homogenization techniques to upscale properties of subsurface media and assign the background properties to coarser grid;however,inappropriate application of upscaling might result in a distortion of the model,which hinders accurate monitoring of the fluid change in *** this work,we instead investigate capabilities of a multiscale method that can deal with fine scale heterogeneities of the reservoir layer and more coarsely meshed rock properties in the surrounding domains in the same *** address the 3-D wave problems,we also demonstrate how the multiscale wave modeling technique can detect the changes caused by fluid movement while the hydrocarbon production activity proceeds.

关键词： Fluid simulation time lapse Generalized multiscale finite element elastic wave

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