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Experimental Simulation Study of the Dominant Enrichment Area of Terrestrial Organic Matter in the Shallow-Delta Sedimentary System of the Yacheng Formation in the Qiongdongnan Basin

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Acta Geologica Sinica(English Edition) 2022年第5期96卷 1693-1703页

作者： XU Xinde yang xibing QU Tong GAO Gang LIANG Gang LI Xing CNOOC China Limited Zhanjiang BranchZhanjiangGuangdong 524057China State Key Laboratory of Petroleum Resources and Prospecting China’s University of PetroleumBeijing 102249China College of Geosciences China’s University of PetroleumBeijing 102249China CNOOC China Limited Hainan BranchHaikou 570312China

Shallow-delta sedimentary systems receive both terrestrial and marine organic matter. As oil and gas exploration activities determine that the source rocks of the deep-water area of the Qiongdongnan Basin, northern South China Sea, are generally rich in and even dominated by terrestrial organic matter, this has led many researchers to examine the rules governing terrestrial organic matter enrichment in shallow-delta sea sedimentary systems. However, the deep burial of source rocks in deep-water areas and the relatively small amount of drilling undertaken have greatly restricted the study of these rules. In this study, the ‘forward modeling' research method was used to observe and analyze the deposition and preservation of terrestrial organic matter through flume experiments, where the depositional results were carefully depicted and sampled. The total organic carbon content of selected samples was measured and when combined with qualitative observations and quantitative comparison results, the dominant enrichment areas of terrestrial organic matter were identified. The experimental results show that the overbank parts of the delta front, the dune countercurrent surface, the low-lying parts, the delta front slope area and the shallow-prodelta sea area are where terrestrial organic matter is predominantly enriched. This provides an important basis and guidance for the prediction of the development areas of marine source rocks with terrestrial input in the deep-water areas of the Qiongdongnan Basin.

关键词： shallow-delta sea sedimentary system deep water area terrestrial organic matter flume experiment enrichment area Qiongdongnan Basin

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Effect of height-diameter ratio on the mechanical characteristics of shale with different bedding orientations

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第7期16卷 2482-2502页

作者： Yide Guo xibing Li Linqi Huang School of Resources and Safety Engineering Central South UniversityChangsha410083China

Geological exploration cores obtained from shale gas wells several kilometers deep often show different height-diameter ratios(H/D)because of complex geological conditions(core disking or developed fractures),which makes further standard specimen preparation for mechanical evaluation of reservoirs *** multi-cluster hydraulic fracturing,shale reservoirs between planes of hydraulic fractures with different lengths could be simplified to have different H/D *** the effect of H/D on the mechanical characteristics of shale specimens with different bedding orientations will support mechanical evaluation tests of reservoirs based on disked geological cores and help to optimize multicluster fracturing *** this study,we performed uniaxial compression tests and acoustic emission(AE)monitoring on cylindrical Longmaxi shale specimens under five bedding orientations and four H/D *** experimental results showed that both the H/D-dependent mechanical properties and AE parameters demonstrated significant *** H/D did not change the uniaxial compressive strength(UCS)evolution versus bedding orientation,demonstrating a V-shaped relationship,but enhanced the curve *** stress level of crack damage for the specimens significantly increased with increasing H/D,excluding the specimens with a bedding orientation of 0°.With increasing H/D,the cumulative AE counts of the specimens with each bedding orientation tended to exhibit a stepped jump against the loading *** proportion of low-average-frequency AE signals(below 100 kHz)in specimens with bedding orientations of 45°and 60°increased to over 70%by increasing H/D,but it only increased to 40%in specimens with bedding orientations of 0°,30°,and 90°.Finally,an empirical model that can reveal the effect of H/D on anisotropic UCS of shale reservoir was proposed,the anisotropic proportion of tensile and shear failure cracks in specimens under four H/D ratios was classified based o

关键词： Geological cores Multi-cluster hydraulic fracturing Height-diameter ratio Longmaxi shale Uniaxial compression test

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醒脑开窍针刺法联合经颅磁刺激对缺血性卒中后恢复期抑郁状态的影响

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上海针灸杂志 2024年第2期43卷 148-154页

作者：刘彦麟杨喜兵任宏斌王笑梅于亚洁罗开涛浙江中医药大学杭州310000 浙江中医药大学附属嘉兴市中医医院嘉兴314001

目的观察醒脑开窍针刺法联合经颅磁刺激对缺血性卒中后患者恢复期抑郁状态的影响。方法将80例符合纳入标准的患者随机分为综合组(40例,中止1例)和西药组(40例,脱落2例)。西药组予口服盐酸度洛西汀肠溶片治疗,综合组在西药组口服药物... 详细信息

目的观察醒脑开窍针刺法联合经颅磁刺激对缺血性卒中后患者恢复期抑郁状态的影响。方法将80例符合纳入标准的患者随机分为综合组(40例,中止1例)和西药组(40例,脱落2例)。西药组予口服盐酸度洛西汀肠溶片治疗,综合组在西药组口服药物基础上予醒脑开窍针刺法联合经颅磁刺激治疗。分别于治疗前后观察患者美国国立卫生院卒中量表(National Institutes of Health stroke scale,NIHSS)、改良Barthel指数(modified Barthel index,MBI)、汉密尔顿抑郁量表(Hamilton depression scale,HAMD)和匹茨堡睡眠质量指数(Pittsburgh sleep quality index,PSQI)的评分变化,以及血清同型半胱氨酸(homocysteine,Hcy)、中性粒细胞/淋巴细胞的比值(neutrophil/lymphocyte ratio,NLR)、5-羟色胺(5-hydroxytryptamine,5-HT)、脑源性神经营养因子(brain-derived neurotrophic factor,BDNF)的水平变化。观察两组治疗前后经颅多普勒超声颅内大血管[大脑前动脉(anterior cerebral artery,ACA)、大脑中动脉(middle cerebral artery,MCA)、大脑后动脉(posterior cerebral artery,PCA)及椎动脉(basilar artery,BA)]血流速度的变化。结果治疗后,两组患者NIHSS、MBI、HAMD和PSQI评分以及血清Hcy、NLR、5-HT和BDNF水平均较治疗前改善(P<0.05),且综合组上述指标均优于西药组(P<0.05)。治疗后,两组ACA、MCA、PCA和BA血流速度均优于治疗前(P<0.05),且综合组上述血管血流速度均优于西药组(P<0.05)。结论在药物治疗基础上,醒脑开窍针刺法联合经颅磁刺激治疗卒中后患者恢复期抑郁状态的临床疗效优于单一口服西药治疗,可减轻患者的抑郁程度,改善睡眠质量,提高肢体功能和日常生活能力,加快脑血管血流速度,改善血清Hcy、NLR、5-HT和BDNF的水平。

关键词：针刺疗法针药并用醒脑开窍经颅磁刺激中风后遗症抑郁血液流变学

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Comparison and significance of specific and non-specific cellular immunity in patients with chronic hepatitis B caused by infection with genotypes B or C of hepatitis B virus

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Science China(Life Sciences) 2009年第8期52卷 719-723页

作者： GU xibing,yang XiaoJuan,WANG Dong,HUA Zhong,WU HangYuan,CHEN HaoKun,XU YueQin & LU ZhongHua Wuxi Hospital for Infectious Diseases,Wuxi 214005,China Wuxi Hospital for Infectious Diseases Wuxi China

The present study was designed to investigate possible relationships between the genotypes of hepatitis B virus(HBV) and the HBV-specific cytotoxic T lymphocyte(CTL) *** genotypes,HBV specific CTL HBV DNA and other markers of HBV infection were determined in 138 patients with chronic hepatitis *** results showed that the patients infected with genotype C(n=62) had a significantly lower HBV-specific CTL response than those who were infected with HBV genotype B(P<0.01).HBV DNA titer was higher in patients infected with HBV genotype C than in those infected with HBV geno-type B(P<0.01).Both alanine aminotransferase(ALT) and total bilirubin(TBIL) were higher in HBV genotype C infected patients than in those infected with genotype B(P<0.01 and <0.05,respectively).These results suggest that compared with CHB patients infected with HBV genotype B,the higher HBV DNA level and more severe liver damages in the patients infected with genotype C of HBV may be associated with genotype C of the virus.

关键词： chronic hepatitis B hepatitis B virus(HBV) genotypes specific cytotoxic T lymphocyte

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Rockburst prediction and prevention in underground space excavation

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Underground Space 2024年第1期14卷 70-98页

作者： Jian Zhou Yulin Zhang Chuanqi Li Haini He xibing Li School of Resources and Safety Engineering Central South UniversityChangsha 410083China Laboratory 3SR CNRS UMR 5521Grenoble Alpes UniversityGrenoble 38000France

The technical challenges associated with deep underground space activities have become increasingly *** these challenges,one major concern is the assessment of rockburst risks and the instability of rock *** research has been conducted by numerous scholars to mitigate the risks and prevent occurrences of rockburst through various assessment *** incidents commonly occur during the excavation of hard rock in underground environments,posing severe threats to personnel safety,equipment integrity,and operational ***,it is crucial to systematically document real cases of rockburst,allowing for a comprehensive understanding of the underlying mechanisms and triggering *** understanding will contribute to the advancement of rockburst prediction and prevention *** selection of an appropriate rockburst assessment method is a fundamental aspect in underground ***,there is a limited number of studies that summarize and compare different prediction and prevention methods of *** paper aims to address this gap by analyzing global trends using CiteSpace software since *** discusses rockburst classification and characteristics,comprehensively reviews research findings related to rockburst prediction,including empirical,simulation,mathematical modeling,and microseismic monitoring ***,the paper presents a compilation of current rockburst prevention ***,the paper emphasizes the significance of control strategies,which provide key insights into the effective utilization of stored energy within ***,the paper concludes by suggesting six directions for implementing intelligent management techniques to mitigate hazards during underground operations and reduce the probability of rockburst incidents.

关键词： Rockburst Underground space Scientometric analysis Characteristic analysis Rockburst prediction Rockburst prevention

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Characteristic stress variation and microcrack evolution of granite subjected to uniaxial compression using acoustic emission methods

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第9期16卷 3511-3523页

作者： Yunge Zhao xibing Li Linqi Huang Zhichao Zhang Zihou Xu School of Resources and Safety Engineering Central South UniversityChangsha410083China

The size of mineral grain has a significant impact on the initiation and propagation of microcracks within *** this study,fine-,medium-,and coarse-grained granites were used to investigate microcrack evolution and characteristic stress under uniaxial compression using the acoustic emission(AE),digital image correlation(DIC),and nuclear magnetic resonance(NMR)*** experimental results show that the characteristic stress of each granite decreased considerably with increasing grain *** inflection points of the b-value occurred earlier with an increase in grain sizes,indicating that the larger grains promote the generation and propagation of *** distribution characteristics of the average frequency(AF)and the ratio of rise time to amplitude(RA)indicate that the proportion of shear microcracks increases with increasing grain *** NMR results indicate that the porosity and the proportion of large pores increased with increasing grain size,which may intensify the microcrack ***,analysis of the DIC and AE event rates suggests that the high-displacement regions could serve as a criterion for the degree of microcrack *** study found that granites with larger grains had a higher proportion of high-displacement regions,which can lead to larger-scale cracking or even *** findings are not only beneficial to understand the pattern of microcrack evolution with different grain sizes,but also provide guidance for rock monitoring and instability assessment.

关键词： Grain size Acoustic emission(AE) Characteristic stress Microcrack evolution Fracture mode

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南海北部北部湾盆地油气藏形成条件

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中国石油勘探 2016年第4期21卷 85-92页

作者：杨希冰中海石油(中国)有限公司湛江分公司

位于南海北部大陆边缘的北部湾盆地以拉张裂陷为主,形成了具有典型断坳双层结构的断陷裂谷盆地,并控制了盆地内"先陆后海"型沉积充填序列。盆地内新生界油藏具有大面积生成、分布、富集并连片成藏的特点,又在不同层位和空间上聚散不一,... 详细信息

位于南海北部大陆边缘的北部湾盆地以拉张裂陷为主,形成了具有典型断坳双层结构的断陷裂谷盆地,并控制了盆地内"先陆后海"型沉积充填序列。盆地内新生界油藏具有大面积生成、分布、富集并连片成藏的特点,又在不同层位和空间上聚散不一,呈现出复杂的变化格局。通过对北部湾盆地构造、沉积、成藏条件的系统分析和勘探开发实践的思考总结,认为富生烃凹陷决定了大中型油气藏的存在,富生烃凹陷内的大型沉积相带与有利构造单元的空间匹配,控制了大中型油气藏的分布。"先断后坳"、"先陆后海"的构造—沉积演化过程是大中型油气藏形成的根本因素。

关键词：南海北部北部湾盆地成藏条件大中型油气藏油气分布

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Performances of fissured red sandstone after thermal treatment with constant-amplitude and low-cycle impacts

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第2期16卷 561-587页

作者： Yongjun Chen Tubing Yin P.G.Ranjith xibing Li Qiang Li Dengdeng Zhuang School of Resources and Safety Engineering Central South UniversityChangsha410083China Department of Civil Engineering Monash UniversityMelbourne3800Australia Oulu Mining School University of OuluOuluFI-90014Finland

In the engineering practices,it is increasingly common to encounter fractured rocks perturbed by temperatures and frequent dynamic *** this paper,the dynamic behaviors and fracture characteristics of red sandstone considering temperatures(25℃,200℃,400℃,600℃,and 800℃)and fissure angles(0°,30°,60°,and 90°)were evaluated under constant-amplitude and low-cycle(CALC)impacts actuated by a modified split Hopkinson pressure bar(SHPB)***,fracture morphology and second-order statistics within the grey-level co-occurrence matrix(GLCM)were examined using scanning electron microscopy(SEM).Meanwhile,the deep analysis and discussion of the mechanical response were conducted through the synchronous thermal analyzer(STA)test,numerical simulations,one-dimensional stress wave theory,and material *** multiple regression models between response variables and interactive effects of independent variables were established using the response surface method(RSM).The results demonstrate the fatigue strength and life diminish as temperatures rise and increase with increasing fissure angles,while the strain rate exhibits an inverse ***,the peak stress intensification and strain rate softening observed during CALC impact exhibit greater prominence at increased fissure *** failure is dominated by tensile damage with concise evolution paths and intergranular cracks as well as the compressor-crushed zone which may affect the failure mode after 400℃.The second-order statistics of GLCM in SEM images exhibit a considerable dependence on the ***,thermal damage dominated by thermal properties controls the material structure and wave impedance and eventually affects the incident wave *** tensile wave reflected from the fissure surface is the inherent mechanism responsible for the angle effect exhibited by the fatigue strength and ***,the peak stress intensification and strain rate softening during impact are determ

关键词： Red sandstone Temperature Fissure Constant-amplitude and low-cycle(CALC) impact Fatigue failure Response surface method(RSM)

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Share Resources on Unified Technology Platform

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ZTE Communications 2003年第2期1卷 54-55页

作者： yang Hongbo,He xibing (Technology Center of ZTE Corporation,Shenzhen 518057,Chine)

The wave of knowledge economy and in-formation revolution has swept over theworld and had a great impact on the de-velopment of world economy, which in-evitably changes the management mode anddevelopment strategy of telecom *** the process, technical resources bring en-terprises not only more business opportunitiesbut also greater challenges to technology man-agement.

关键词： ZTE of on

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断陷盆地轴向沉积体系空间展布及演化特征——以北部湾盆地涠西南凹陷为例

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中国矿业大学学报 2020年第3期49卷 542-551页

作者：秦春雨王华姜平杨希冰邹康中国地质大学(武汉)资源学院湖北武汉430074 中海石油(中国)有限公司湛江分公司广东湛江524057

轴向沉积体系是陆相断陷盆地油气勘探中的有利相带.为加深对断陷盆地轴向沉积体系发育及其演化的认识,以北部湾盆地涠西南凹陷为例,利用三维地震资料、滨线迁移轨迹特征及钻井信息,揭示涠西南凹陷流一段西部轴向三角洲沉积体系的空间展... 详细信息

轴向沉积体系是陆相断陷盆地油气勘探中的有利相带.为加深对断陷盆地轴向沉积体系发育及其演化的认识,以北部湾盆地涠西南凹陷为例,利用三维地震资料、滨线迁移轨迹特征及钻井信息,揭示涠西南凹陷流一段西部轴向三角洲沉积体系的空间展布及演化特征,认为轴向三角洲沉积通常发育于断陷盆地裂陷晚期,其垂向叠置样式及空间展布受到构造活动、古地貌以及相对湖平面变化的控制.研究结果表明,涠西南凹陷西部轴向三角洲沉积体系由6期加积和进积两种不同类型的准层序组构成.加积型准层序组发育时期,可容空间增长速率较高,顶积层厚度较大,单期厚度约为50~80 m,底积层延伸范围广,以发育S型前积为特征,前积角度相对较低(1.5°~2.0°),滨线迁移轨迹为上升型;进积型准层序组发育时期,可容空间增长速率较低,缺乏顶积层(厚度小于30 m),以发育斜交型前积为特征,前积角度高,平均约为3°,可见顶超现象,滨线迁移轨迹为平缓型.加积与进积两种类型准层序组相互叠置,交替出现,在垂向和横向上对涠西南凹陷进行充填.轴向三角洲沉积发育于涠西南凹陷第2次裂陷晚期,其空间展布及演化受相对湖平面阶段性变化及构造-古地貌格局的控制,相对湖平面经历了多次"上升-稳定"的阶段性变化,沿二号断裂带的差异沉降很可能是导致这种阶段性变化的因素.

关键词：轴向三角洲体系涠西南凹陷滨线迁移轨迹相对湖平面变化差异沉降二号断裂带

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