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Computer Modeling in Engineering & Sciences 2025年第1期142卷 691-712页

作者： Quynh-Anh Thi Bui Dam Duc Nguyen Hiep Van Le Indra Prakash Binh Thai Pham Civil Engineering Department University of Transport Technology54 Trieu KhucThanh XuanHanoi100000Vietnam DDG(R)geological survey of India Gandhinagar382010India

Determination of Shear Bond strength(SBS)at interlayer of double-layer asphalt concrete is crucial in flexible pavement *** study used three Machine Learning(ML)models,including K-Nearest Neighbors(KNN),Extra Trees(ET),and Light Gradient Boosting Machine(LGBM),to predict SBS based on easily determinable input ***,the Grid Search technique was employed for hyper-parameter tuning of the ML models,and cross-validation and learning curve analysis were used for training the *** models were built on a database of 240 experimental results and three input variables:temperature,normal pressure,and tack coat *** validation was performed using three statistical criteria:the coefficient of determination(R2),the Root Mean Square Error(RMSE),and the mean absolute error(MAE).Additionally,SHAP analysis was also used to validate the importance of the input variables in the prediction of the *** show that these models accurately predict SBS,with LGBM providing outstanding ***(Shapley Additive explanation)analysis for LGBM indicates that temperature is the most influential factor on ***,the proposed ML models can quickly and accurately predict SBS between two layers of asphalt concrete,serving practical applications in flexible pavement structure design.

关键词： Shear bond asphalt pavement grid search optimization machine learning

Geochemical characteristics of Jurassic coal and significance for the evolution of the environment, Yanqi Basin, China

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Progress in Natural Science:Materials International 2006年第9期16卷 974-982页

作者： WU Chaodong , XU Youling, GUO Zhaojie1, QUAN Shujin, LI Yonglin and FENG Xue ( Key Laboratory of Orogenic Belts and Crustal Evolution of Department of Education, Peking University, Beijing 100871, China 3rd geological survey brigade, Henan Bureau of Mineralogical and Resources, Xinyang 476000, China Exploration & Development Research Institute of Henan Oilfield, SINOPEC, Nanyang 473132, China) Key Laboratory of Orogenic Belts and Crustal Evolution of Department of Education Peking University Beijing 100871 China 3rd geological survey brigade Henan Bureau of Mineralogical and Resources Xinyang 476000 China Exploration and Development Research Institute of Henan Oilfield SINOPEC Nanyang 473132 China

The Mesozoic strata of the Yanqi Basin consists of coarse debris with coal beds, characterized by the developments of coal seams of the Jurassic sediments whose main petrologic contents are glutenite, fine sandstone, mudstone, carbonaceous shale and coal. Based on the analyses of the minerals, trace elements and REEs, we try to find geochemical characteristics of the coal seam formation process. The analysis results indicate that the contents of ash and sulfur are low while the content of phosphor is comparatively high, and that the specific value of Al2O3/SiO2 is relatively high and that of (Al2O3 + SiO2)/(Fe2O3 + CaO+ MgO) is near 1. All these results indicate that the coal seams are formed in the relatively deep marsh, which is favorable for the evolvement of hydrocarbon at the diagenesis stage.

关键词： coal sedimentary geochemistry trace elements Jurassic.

Genesis of the Wulong gold deposit,Liaoning Province,NE China:Constrains from noble gases,radiogenic and stable isotope studies

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Geoscience Frontiers 2020年第2期11卷 547-563页

作者： Peng Zhang Linlin Kou Yan Zhao Zhongwei Bi Deming Sha Renping Han Zhumin Li Shenyang geological survey Center China geological survey

The Wulong lode deposit contains over 80 tonnes of gold with an average grade of 5.35 g/*** is one of the largest deposits in Dandong City,Liaoning Province in northeast *** studies on the deposit focused on its geological characteristics,geochemistry,fluid inclusions,and the timing of gold ***,controversy remains regarding the origin of the ore-forming fluids and metals,and the genesis of the gold *** paper presents zircon U-Pb and pyrite Rb-Sr ages and S,Pb,He,and Ar isotopic results along with quartz H and O isotopic data for all litho-units associated with the *** ablation inductively coupled mass spectrometry measurements yielded zircon U-Pb dates for samples of pre-mineralization rocks like granite porphyry dike,the Sanguliu granodiorite,fine-grained diorite,and syn-mineralization diorite,as well as post-mineralization dolerite,and lamprophyre;their emplacement ages are 126±1 Ma,124±1 Ma,123±1 Ma,120±1 Ma,119±2 Ma,and 115±2 Ma,*** pyrite Rb-Sr isochron age is 119±1 Ma,indicating that both magmatism and mineralization occurred during the Early *** δ18OH2 O values of ore-forming hydrothermal fluids from the quartz-polymetallic sulfide vein stage vary from 4.8‰to 6.5‰,and the δDv-SMOW values are between-67.7‰and-75.9‰,indicating that the ore-forming fluids were primarily *** noble gas isotope compositions of fluid inclusions hosted in pyrite suggest that the ore-forming fluids were dominantly derived from crustal sources with minor mantle *** isotopic values of pyrite vary between 0.2‰and 3.5‰,suggesting that S was derived from a homogeneous magmatic source or possibly from fluids derived from the *** Pb isotopic compositions of sulfides（207 Pb/204 Pb=15.51-15.71,206 Pb/204 Pb=17.35-18.75,208 Pb/204 Pb=38.27-40.03） indicate that the Pb of the Wulong gold deposit is a mixture of crust and mantle *** and geochemical data,together with the region

关键词： The Wulong gold deposit Zircon U-Pb Pyrite Rb-Sr H-He-O-Ar-S-Pb isotopes Liaodong Peninsula

Gas Sources of Natural Gas Hydrates in the Shenhu Drilling Area, South China Sea: Geochemical Evidence and geological Analysis

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Acta Geologica Sinica(English Edition) 2013年第3期87卷 767-776页

作者： ZHU Youhai HUANG Xia FU Shaoying SU Pibo Oil & Gas survey China Geological Survey Institute of Mineral Resources Chinese Academy of Geological Sciences Guangzhou Marine geological survey

The Shenhu gas hydrate drilling area is located in the central Baiyun sag, Zhu I! depression, Pearl River Mouth basin, northern South China Sea. The gas compositions contained in the hydrate-bearing zones is dominated by methane with content up to 99.89% and 99.91%. The carbon isotope of the methane （δ^13C1） are -56.7%0. and -60.9%0, and its hydrogen isotope （δD） are -199%0 and -180%0, respectively, indicating the methane from the microbial reduction of CO2. Based on the data of measured seafloor temperature and geothermal gradient, the gas formed hydrate reservoirs are from depths 24-1699 m below the seafloor, and main gas-generation zone is present at the depth interval of 416-1165 m. Gas-bearing zones include the Hanjiang Formation, Yuehai Formation, Wanshan Formation and Quaternary sediments. We infer that the microbial gas migrated laterally or vertically along faults （especially interlayer faults）, slump structures, small-scale diapiric structures, regional sand beds and sedimentary boundaries to the hydrate stability zone, and formed natural gas hydrates in the upper Yuehai Formation and lower Wanshan Formation, probably with contribution of a little thermogenic gas from the deep sedments during this process.

关键词： natural gas hydrate methane microbial gas gas source migration South China Sea

Genesis of the Maoling gold deposit in the Liaodong Peninsula:Constraints from a combined fluid inclusion,C-H-O-S-Pb-He-Ar isotopic and geochronological studies

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Geoscience Frontiers 2022年第4期13卷 11-33页

作者： Peng Zhang Linlin Kou Yan Zhao Deming Sha Shenyang geological survey Center China Geological SurveyShenyang 110034China

The large tonnage Maoling gold deposit(25 t@3.2 g/t)is located in the southwest Liaodong Peninsula,North China *** deposit is hosted in the Paleoproterozoic metamorphic *** stages of mineralization were identified in the deposit:(stageⅠ)quartz-arsenopyrite±pyrite,(stageⅡ)quartz-goldarsenopyrite-pyrrhotite,(stageⅢ)quartz-gold-polymetallic sulfide,and(stageⅣ)*** this paper,we present fluid inclusion,C-H-O-S-Pb-He-Ar isotope data,zircon U-Pb,and gold-bearing sulfide(*** and pyrrhotite)Rb-Sr age of the Maoling gold deposit to constrain its genesis and ore-forming *** types of fluid inclusions were distinguished in quartzbearing veins,including liquid-rich two-phase(WL type),gas-rich two-phase(GL type),and daughter mineral-bearing fluid inclusions(S type).Fluid inclusions data show that the homogenization at temperatures 197 to 372°C for stageⅠ,126 to 319°C for stageⅡ,119 to 189°C for stageⅢ,and 115 to 183°C for stageⅣ,with corresponding salinities of 3.7 to 22.6 wt.%,4.7 to 23.2 wt.%,5.3 to 23.2 wt.%,and 1.7 to14.9 wt.%Na Cl equiv.,*** boiling was the critical factor controlling the gold and associated sulfide precipitation at *** and oxygen stable isotopic analyses for quartz yielded δ^(18)O=-5.0‰ to 9.8‰ and δD=-133.5‰ to-77.0‰.Carbon stable isotopic analyses for calcite and ankerite yielded δ^(13)C=-2.3‰to-1.2‰ and O=7.9‰ to 14.1‰.The C-H-O isotope data show that the oreforming fluids were originated from magmatic water with meteoric water input during *** inclusions in arsenopyrite have ^(3)He/^(4)He ratios of 0.002 Ra to 0.054 Ra,and ^(40)Ar/^(36)Ar rations of 1225 to 3930,indicating that the ore-forming fluids were dominantly derived from crustal sources almost no mantle *** isotopic values of Maoling fine-grained granite range from6.‰1 to 9.8‰,with a mean of 7.7‰,δ^(34)S values of arsenopyrite from the mineralized phyllite(host rock)range fr

关键词： Geochronology Fluid inclusions Isotope geochemistry Maoling gold deposit Liaodong Peninsula

Improving reservoir volumetric estimations in petroleum resource assessment using discovery process models

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Petroleum Science 2009年第2期6卷 105-118页

作者： Osadetz Kirk G. geological survey of Canada

The reservoir volumetric approach represents a widely accepted, but flawed method of petroleum play resource calculation. In this paper, we propose a combination of techniques that can improve the applicability and quality of the resource estimation. These techniques include： 1） the use of the Multivariate Discovery Process model （MDP） to derive unbiased distribution parameters of reservoir volumetric variables and to reveal correlations among the variables; 2） the use of the Geo-anchored method to estimate simultaneously the number of oil and gas pools in the same play; and 3） the crossvalidation of assessment results from different methods. These techniques are illustrated by using an example of crude oil and natural gas resource assessment of the Sverdrup Basin, Canadian Archipelago. The example shows that when direct volumetric measurements of the untested prospects are not available, the MDP model can help derive unbiased estimates of the distribution parameters by using information from the discovered oil and gas accumulations. It also shows that an estimation of the number of oil and gas accumulations and associated size ranges from a discovery process model can provide an alternative and efficient approach when inadequate geological data hinder the estimation. Cross-examination of assessment results derived using different methods allows one to focus on and analyze the causes for the major differences, thus providing a more reliable assessment outcome.

关键词： Multivariate Discovery Process model sampling bias correction cross-validation Geoanchored method

Origin of the Newly Discovered Zhunuo Porphyry Cu-Mo-Au Deposit in the Western Part of the Gangdese Porphyry Copper Belt in the Southern Tibetan Plateau,SW China

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Acta Geologica Sinica(English Edition) 2017年第1期91卷 109-134页

作者： HUANG Yong LI Guangming DING Jun DAI Jie YAN Guoqiang DONG Suiliang HUANG Hanxiao Chengdu Center China Geological Survey Tianjin Center China Geological Survey

The newly discovered Zhunuo porphyry Cu-Mo-Au deposit is located in the western part of the Gangdese porphyry copper belt in southern Tibet, SW China. The granitoid plutons in the Zhunuo region are composed of quartz diorite porphyry, diorite porphyry, granodiorite porphyry, biotite monzogranite and quartz porphyry. The quartz diorite porphyry yielded zircon U-Pb ages of 51.9±0.7 Ma（Eocene） using LA-ICP-MS, whereas the diorite porphyry, granodiorite porphyry, biotite monzogranite and quartz porphyry yielded ages ranging from 16.2±0.2 to 14.0±0.2 Ma（Miocene）. CuMo-Au mineralization is mainly hosted in the Miocene granodiorite porphyry. Samples from all granitoid plutons have geochemical compositions consistent with high-K calc-alkaline series magmatism. The samples display highly fractionated light rare-earth element（REE） distributions and heavy REE distributions with weakly negative Eu anomalies on chondrite-normalized REE patterns. The trace element distributions exhibit positive anomalies for large-ion lithophile elements（Rb, K, U, Th and Pb） and negative anomalies for high-field-strength elements（Nb and Ti） relative to primitive mantlenormalized values. The Eocene quartz diorite porphyry yielded εNd（t） values ranging from-3.6 to-5.2,（-（87）Sr/-（86）Sr）i values in the range 0.7046–0.7063 and initial radiogenic Pb isotopic compositions with ranges of 18.599–18.657 -（206）Pb/-（204）Pb, 15.642–15.673 -（207）Pb/-（204）Pb and 38.956–39.199 -（208）Pb/-（204）Pb. In contrast, the Miocene granitoid plutons yielded ε（Nd）（t） values ranging from-6.1 to-7.3 and（87Sr/86Sr）i values in the range 0.7071–0.7078 with similar Pb isotopic compositions to the Eocene quart diorite. The Sr-Nd-Pb isotopic compositions of the rocks are consistent with formation from magma containing a component of remelted ancient crust. Zircon grains from the Eocene quartz diorite have ε（Hf）（t） values ranging from-5.2 to ＋0.9 and two-stage Hf model ages ranging from 1.07 to 1.46 Ga, while zircon grains from the M

关键词： Zircon U-Pb dating Sr-Nd-Pb-Hf isotope Zhunuo porphyry Cu-Mo-Au deposit Gangdese porphyry copper belt

Earthquake swarms near eastern Himalayan Syntaxis along Jiali Fault in Tibet:A seismotectonic appraisal

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Geoscience Frontiers 2015年第5期6卷 715-722页

作者： Basab Mukhopadhyay Sujit Dasgupta Geodata and Database Division Geological Survey of IndiaCentral Headquarters geological survey of India

The seismotectonic characteristics of ten repeated earthquake swarm sequence within a seismic cluster along Jiali Fault in eastern Himalayan Syntaxis(EHS) have been *** swarms are spatially disposed in and around Yigong Lake(a natural lake formed by blocking of Yigong River by landslide) and are characterized by low magnitude,crustal events with low to moderate b ***:mb discriminant functions though indicate anomalous nature of the earthquakes within swarm but are considered as natural events that occurred under condition of high apparent stress and stress *** fault plane solutions of selected swarms indicate strike-slip sense of shear on fault planes;solution parameters show low plunging compression and tensional axes along NW-SE and NE-SW respectively with causative fault plane oriented *** steeply towards south or *** fault plane is in excellent agreement with the disposition and tectonic movement registered by right lateral Jiali *** process of pore pressure perturbation and resultant ’r—t plot’ with modelled diffusivity(D = 0.12 m^2/s) relates the diffusion of pore pressure to seismic sequence in a fractured poro-elastic fluid saturated medium at average crustal depth of 15-20 *** low diffusivity depicts a highly fractured interconnected medium that is generated due to high stress activity near the eastern syntaxial bent of *** is proposed that hydro fracturing with respect to periodic pore pressure variations is responsible for generation of swarms in the *** fluid pressure generated due to shearing and infiltrations of surface water within dilated seismogenic fault(Jiali Fault) are causative factors.

关键词： Seismic swarm Eastern Himalayan Syntaxis(EHS) Jial

PRESENT STRESS STATE NEAR MEILING ARCUATE FAULTS

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Science in China,Ser.B 1985年第1期28卷 82-91页

作者：孙叶王宗杰沈士贞杨建华师继承田洪清程伟雪张景寿 562 Comprehensive geological brigade Chinese Academy of geological Sciences

In this paper an analysis of the present stress field near the Meiling arcuate faults in Beijing area is made. Based on the in situ stress measurements, petrofabric analysis and model experiments, it has been found that this local stress field is a rotational shear stress field. It has been active from the late Yenshanian up to the present with the outer side rotating clockwise. The features of the local stress field are different from those of the present regional stress field characteristic of the Neocathaysian system. The trajectories of the maximum principal compressive stresses of the former show an arcuate pattern converging towards SE and diverging towards NW. However, those of the latter extend approximately in the NWW direction.

关键词： PRESENT STRESS STATE NEAR MEILING ARCUATE FAULTS

Characterizing the Micropores in Lacustrine Shales of the Late Cretaceous Qingshankou Formation of Southern Songliao Basin, NE China

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Acta Geologica Sinica(English Edition) 2018年第6期92卷 2267-2279页

作者： GE Mingna REN Shoumai GUO Tianxu ZHOU Zhi WANG Shengjian BAO Shujing Oil and Gas survey China Geological SurveyBeijing 100083China China geological survey Beijing 100037China

Micropores of shale are significant to the gas content and production potential of shale, which has been verified in the research of marine shale gas; while, few studies have been conducted on lacustrine shales. This study collected 42 samples from three wells in the Late Cretaceous Qingshankou Formation of the southern Songliao Basin, NE China, and investigated these samples by the focused ion beam-scanning electron microscope(FIB–SEM) and nitrogen adsorption analysis techniques. Four types of micropores were identified in the samples, i.e., intergranular pore, intracellular pore, organic matter pore and microfracture. The pore structure type is characterized by open slit pores and "ink type" pores which are mainly 1.5–5 nm in diameter with mesopores as the main pores. The mesopores account for 74.01% of the pore volume and 54.68% of the pore surface area. Compared with the lacustrine shales from the Triassic Yanchang Formation in the Ordos Basin and Xujiahe Formation in the Sichuan Basin, the intergranular clay mineral interlayer pores are considered to be the main reservoir space for shale gas storage in the study area, followed by intraparticle pores, organic matter pores and microfractures. Maturity and micropore are the key controlling factors which affect the shale gas content of the Qingshankou Formation in southern Songliao Basin.

关键词： micropores lacustrine shale Cretaceous Qingshankou Formation southern Songliao Basin