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Multi-scale data joint inversion of minerals and porosity in altered igneous reservoirs—A case study in the South China Sea

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Petroleum science 2024年第1期21卷 206-220页

作者： Xin-Ru Wang Bao-Zhi Pan Yu-Hang Guo Qing-Hui Wang Yao Guan college of geo-exploration science and Technology Jilin UniversityChangchun130046JilinChina Research Institute CNOOC Ltd.-ShenzhenShenzhen518000GuangdongChina

There are abundant igneous gas reservoirs in the South China Sea with significant value of research,and lithology classification,mineral analysis and porosity inversion are important links in reservoir ***,affected by the diverse lithology,complicated mineral and widespread alteration,conventional logging lithology classification and mineral inversion become considerably *** the same time,owing to the limitation of the wireline log response equation,the quantity and accuracy of minerals can hardly meet the exploration requirements of igneous *** overcome those issues,this study takes the South China Sea as an example,and combines multi-scale data such as micro rock slices,petrophysical experiments,wireline log and element cutting log to establish a set of joint inversion methods for minerals and porosity of altered igneous ***,we define the lithology and mineral characteristics through core slices and mineral data,and establish an igneous multi-mineral volumetric *** we determine element cutting log correction method based on core element data,and combine wireline log and corrected element cutting log to perform the lithology classification and joint inversion of minerals and ***,it is always difficult to determine the elemental eigenvalues of different minerals in *** paper uses multiple linear regression methods to solve this ***,an integrated inversion technique for altered igneous formations was *** results show that the corrected element cutting log are in good agreement with the core element data,and the mineral and porosity results obtained from the joint inversion based on the wireline log and corrected element cutting log are also in good agreement with the core data from X-ray *** results demonstrate that the inversion technique is applicable and this study provides a new direction for the mineral inversion research of altered igneous formation

关键词： Joint inversion Altered igneous rock Element correction method Lithology identification Multi mineral volume model

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A method to interpret fracture aperture of rock slope using adaptive shape and unmanned aerial vehicle multi-angle nap-of-the-object photogrammetry

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Journal of Rock Mechanics and geotechnical Engineering 2024年第3期16卷 924-941页

作者： Mingyu Zhao Shengyuan Song Fengyan Wang Chun Zhu Dianze Liu Sicong Wang college of Construction Engineering Jilin UniversityChangchun130026China college of geo-exploration science and Technology Jilin UniversityChangchun130026China Institute of Engineering geology and geohazards Hohai UniversityNanjing210098China

The aperture of natural rock fractures significantly affects the deformation and strength properties of rock masses,as well as the hydrodynamic properties of fractured rock *** conventional measurement methods are inadequate for collecting data on high-steep rock slopes in complex mountainous *** study establishes a high-resolution three-dimensional model of a rock slope using unmanned aerial vehicle(UAV)multi-angle nap-of-the-object photogrammetry to obtain edge feature points of *** opening morphology is characterized using coordinate projection and *** central axis is determined using vertical measuring lines,allowing for the interpretation of aperture of adaptive fracture *** feasibility and reliability of the new method are verified at a construction site of a railway in southeast Tibet,*** study shows that the fracture aperture has a significant interval effect and size *** optimal sampling length for fractures is approximately 0.5e1 m,and the optimal aperture interpretation results can be achieved when the measuring line spacing is 1%of the sampling *** fractures in the study area generally have larger apertures than shear fractures,and their tendency to increase with slope height is also greater than that of shear *** aperture of tensile fractures is generally positively correlated with their trace length,while the correlation between the aperture of shear fractures and their trace length appears to be *** of different orientations exhibit certain differences in their distribution of aperture,but generally follow the forms of normal,log-normal,and gamma *** study provides essential data support for rock and slope stability evaluation,which is of significant practical importance.

关键词： Unmanned aerial vehicle(UAV) photogrammetry High-steep rock slope Fracture aperture Interval effect Size effect Parameter interpretation

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Effect of gas saturation on P-wave velocity in tight sandstone

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Applied geophysics 2024年第3期21卷 487-495,617页

作者： Pan Bao-Zhi Zhou Wei-Yi Guo Yu-Hang Fang Chun-Hui Zhang Li-Hua college of geo-exploration science and Technology Jilin UniversityChangchun 130026China

By measuring the variation of the P-and S-wave velocities of tight sandstone samples under water saturation,it was confirmed that with the decrease in water saturation,the P-wave velocity first decreased and then *** variation in velocity was influenced by the sandstone’s *** commonly used Gassmann equation based on fluid substitution theory was *** the calculated results with the measured data,it was found that the Gassmann equation agreed well with the measured data at high water saturation,but it could not explain the bending phenomenon of P-wave velocity at low *** indicated that these equations could not accurately describe the relationship between fluid content and rock acoustic *** reasons for this phenomenon were discussed through Taylor’s *** coefficients of the fitting formula were calculated and verified by fitting the measured acoustic velocity changes of the *** relationship between P-wave velocity and saturation was discussed,which provides experimental support for calculating saturation using seismic and acoustic logging data.

关键词： Tight sandstone Saturation model Reservoir parameters Acoustic wave measurement

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3D time-domain forward modeling of airborne transient electromagnetism considering superparamagnetic effect

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Global geology 2024年

作者： LI Zizhuo LIU Yunhe REN Xiuyan college of geo-exploration science and Technology， Jilin University

The superparamagnetic effect arises from the superparamagnetism exhibited by a multitude of nano-sized magnetic mineral particles under an external electric field. This phenomenon manifests in transient electromagnetic data primarily as a deceleration in the attenuation rate of late-stage signals， a characteristic difficult to discern directly from airborne transient electromagnetic signals， consequently leading to significant misinterpretations of subterranean electrical structures. This study embarks on 3D forward modeling of airborne electromagnetic responses in the frequency domain， accounting for the superparamagnetic effect， utilizing an unstructured finite element method. Superparamagnetic responses in the time domain were obtained through frequency-time conversion. This investigation explores the influence of various parameters—such as magnetic susceptibility， time constants， and flight altitude—on the superparamagnetic effect by examining the response characteristics of typical targets. Findings indicate that in its late stages， the superparamagnetic effect can induce a relative anomaly of up to 300%. There is a positive correlation between magnetic susceptibility and the strength of the superparamagnetic effect. The influence of the time constant’s upper and lower limits on the superparamagnetic effect is minimal; however， the range between these limits significantly affects the effect， showing a negative correlation with its intensity. Higher flight altitudes weaken the superparamagnetic signal. The impact is most pronounced when superparamagnetic minerals are shallowly buried， effectively shielding the underlying geology with the characteristics of a good conductivity anomaly， but this effect diminishes with greater depth. The insights from this study provide a theoretical framework for a deeper understanding of the superparamagnetic effect in transient electromagnetic signals and for more accurate interpretations of subterranean geological and electrica

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Urban growth scenario projection using heuristic cellular automata in arid areas considering the drought impact

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Journal of Arid Land 2024年第4期16卷 580-601页

作者： TANG Xiaoyan FENG Yongjiu LEI Zhenkun CHEN Shurui WANG Jiafeng WANG Rong TANG Panli WANG Mian JIN Yanmin TONG Xiaohua college of Surveying&geo-Informatics Tongji UniversityShanghai 200092China Shanghai Key Laboratory of Space Mapping and Remote Sensing for Planetary exploration Tongji UniversityShanghai 200092China

Arid areas with low precipitation and sparse vegetation typically yield compact urban pattern,and drought directly impacts urban site selection,growth processes,and future *** simulation and projection based on cellular automata(CA)models is important to achieve sustainable urban development in arid *** developed a new CA model using bat algorithm(BA)named bat algorithm-probability-of-occurrence-cellular automata(BA-POO-CA)model by considering drought constraint to accurately delineate urban growth patterns and project future scenarios of Urumqi City and its surrounding areas,located in Xinjiang Uygur Autonomous Region,*** calibrated the BA-POO-CA model for the drought-prone study area with 2000 and 2010 data and validated the model with 2010 and 2020 data,and finally projected its urban scenarios in *** results showed that BA-POO-CA model yielded overall accuracy of 97.70%and figure-of-merits(FOMs)of 35.50%in 2010,and 97.70%and 26.70%in 2020,*** inclusion of drought intensity factor improved the performance of BA-POO-CA model in terms of FOMs,with increases of 5.50%in 2010 and 7.90%in 2020 than the model excluding drought intensity *** suggested that the urban growth of Urumqi City was affected by drought,and therefore taking drought intensity factor into account would contribute to simulation *** BA-POO-CA model including drought intensity factor was used to project two possible scenarios(i.e.,business-as-usual(BAU)scenario and ecological scenario)in *** the BAU scenario,the urban growth dominated mainly in urban fringe areas,especially in the northern part of Toutunhe District,Xinshi District,and Midong *** exceptional and extreme drought areas as a spatial constraint,the urban growth was mainly concentrated in the"main urban areas-Changji-Hutubi"corridor urban pattern in the ecological *** results of this research can help to adjust urban planning and development *** mode

关键词： bat algorithm cellular automata(CA) probability-of-occurrence drought intensity algorithm-probability-of-occurrence-cellular automata(BA-POO-CA)model arid areas

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UAV-based transient electromagnetic 3D forward modeling and inversion and analysis of exploration capability

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Global geology 2024年第3期27卷 154-166页

作者： WEI Laonao LIU Yunhe ZHANG Bo college of geo-exploration science and Technology Jilin UniversityChangchun 130026China

Unmanned aerial vehicle transient electromagnetic(UAV-TEM)is a novel airborne exploration method that offers advantages such as low cost,simple operation,high exploration efficiency and suitability for near-surface exploration in complex terrain *** improve the accuracy of data interpretation in this method,the authors conducted a systematic three-dimensional(3D)forward modeling and inversion of the *** study utilized the finite element method based on unstructured tetrahedral elements and employed the second-order backward Euler method for time *** allowed for accurate 3D modeling and accounted for the effects of complex *** on these,the influence characteristics of flight altitudes and the sizes,burial depths,and resistivities of anomalies are compared and analyzed to explore the UAV-TEM systems’exploration ***,four typical geoelectrical models of landslides are designed,and the inversion method based on the Gauss-Newton optimization method is used to image the landslide models and analyze the imaging effect of the UAV-TEM method on landslide *** results showed that UAV-TEM could have better exploration resolution and fine imaging of nearsurface structures,providing important technical support for monitoring,early warning,and preventing landslides and other geological hazards.

关键词： UAV 3D forward modeling transient electromagnetic 3D inversion landslide model

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Horizontal-to-vertical spectral ratio inversion method based on multimodal forest optimization algorithm

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Global geology 2024年第3期27卷 167-176页

作者： CHEN Xuanning HAN Fuxing GAO Zhenghui SUN Zhangqing HAN Jiangtao college of geo-exploration science and Technology Jilin UniversityChangchun 130026China

The exploration of urban underground spaces is of great significance to urban planning,geological disaster prevention,resource exploration and environmental ***,due to the existing of severe interferences,conventional seismic methods cannot adapt to the complex urban environment *** adopting the single-node data acquisition method and taking the seismic ambient noise as the signal,the microtremor horizontal-to-vertical spectral ratio(HVSR)method can effectively avoid the strong interference problems caused by the complex urban environment,which could obtain information such as S-wave velocity and thickness of underground formations by fitting the microtremor HVSR ***,HVSR curve inversion is a multi-parameter curve fitting *** conventional inversion methods can easily converge to the local minimum,which will directly affect the reliability of the inversion ***,the authors propose a HVSR inversion method based on the multimodal forest optimization algorithm,which uses the efficient clustering technique and locates the global optimum *** on synthetic data show that the inversion results of the proposed method are consistent with the forward *** the adaption and stability to the abnormal layer velocity model are *** results of the real field data are also verified by the drilling information.

关键词： microtremor HVSR method multimodal forest optimization algorithm HVSR curve inversion

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CAUCHY TYPE INTEGRALS AND A BOUNDARY VALUE PROBLEM IN A COMPLEX CLIFFORD ANALYSIS

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Acta Mathematica Scientia 2024年第1期44卷 369-385页

作者：曹南斌李尊凤杨贺菊乔玉英 School of Mathematics and science Hebei GEO UniversityShijiazhuang050031China college of science Hebei University of Science and TechnologyShijiazhuang050018China School of Mathematical sciences Hebei Normal UniversityShijiazhuang050024China

Clifford analysis is an important branch of modern analysis;it has a very important theoretical significance and application value,and its conclusions can be applied to the Maxwell equation,Yang-Mill field theory,quantum mechanics and value *** this paper,we first give the definition of a quasi-Cauchy type integral in complex Clifford analysis,and get the Plemelj formula for ***,we discuss the H?lder continuity for the Cauchy-type integral operators with values in a complex Clifford ***,we prove the existence of solutions for a class of linear boundary value problems and give the integral representation for the solution.

关键词： Clifford analysis Cauchy type integral Plemelj formula Holder continuous boundary value problems

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SemID: Blind Image Inpainting with Semantic Inconsistency Detection

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Tsinghua science and Technology 2024年第4期29卷 1053-1068页

作者： Xin Li Zhikuan Wang Chenglizhao Chen Chunfeng Tao Yuanbo Qiu Junde Liu Baile Sun college of Computer science and Technology China University of Petroleum(East China)Qingdao 266580China CNPC Oriental geophysical exploration Co.Ltd. Baoding 072751China

Most existing image inpainting methods aim to fill in the missing content in the inside-hole region of the target image. However, the areas to be restored in realistically degraded images are unspecified. Previous studies have failed to recover the degradations due to the absence of the explicit mask indication. Meanwhile, inconsistent patterns are blended complexly with the image content. Therefore, estimating whether certain pixels are out of distribution and considering whether the object is consistent with the context is necessary. Motivated by these observations, a two-stage blind image inpainting network, which utilizes global semantic features of the image to locate semantically inconsistent regions and then generates reasonable content in the areas, is proposed. Specifically, the representation differences between inconsistent and available content are first amplified, iteratively predicting the region to be restored from coarse to fine. A confidence-driven inpainting network based on prediction masks is then used to estimate the information regarding missing regions. Furthermore, a multiscale contextual aggregation module is introduced for spatial feature transfer to refine the generated contents. Extensive experiments over multiple datasets demonstrate that the proposed method can generate visually plausible and structurally complete results that are particularly effective in recovering diverse degraded images.

关键词： blind image inpainting inconsistent pattern representation difference contextual aggregation

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Selective core-shell doping enabling high performance 4.6 V-LiCoO2

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Journal of Energy Chemistry 2024年第8期95卷 684-693页

作者： Yueming Xia Jianrui Feng Jinhui Li Yan Li Zhengfeng Zhang Xiaoqi Wang Jianli Shao Manling Sui Pengfei Yan Beijing Key Laboratory of Microstructure and Property of Solids College of Materials Science & Engineering Beijing University of Technology Petro China Research Institute of Petroleum exploration & Development State Key Laboratory of Explosion science and Technology Beijing Institute of Technology

Constructing robust surface and bulk structure is the prerequisite for realizing high performance high voltage LiCoO2（LCO）.Herein,we manage to synthesize a surface Mg-doping and bulk Al-doping coreshell structured LCO,which demonstrates excellent cycling ***-cell shows 94.2% capacity retention after 100 cycles at 3.0-4.6 V（***/Li+） cycling,and no capacity decay after 300 cycles for fullcell test（3.0-4.55 V）.Based on comprehensive microanalysis and theoretical calculations,the degradation mechanisms and doping effects are systematically *** the undoped LCO,high voltage cycling induces severe interfacial and bulk degradations,where cracks,stripe defects,fatigue H2 phase,and spinel phase are identified in grain *** the doped LCO,Mg-doped surface shell can suppress the interfacial degradations,which not only stabilizes the surface structure by forming a thin rock-salt layer but also significantly improves the electronic conductivity,thus enabling superior rate *** Al-doping can suppress the lattice "breathing" effect and the detrimental H3 to H1-3 phase transition,which minimizes the internal strain and defects growth,maintaining the layered structure after prolonged *** theoretical calculations,this work deepens our understanding of the doping effects of Mg and Al,which is valuable in guiding the future material design of high voltage LCO.

关键词： Doping effect Electron microscopy Failure mechanism High-voltage LiCoO2 Lithium-ion battery

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