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琼东南海域天然气水合物赋存区沉积物地球化学特征及气源指示意义

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天然气地球科学 2024年第6期35卷 1044-1060页

作者：刘华欣李美俊赖洪飞匡增桂付莹方允鑫中国石油大学(北京)油气资源与工程全国重点实验室北京102249 中国石油大学(北京)地球科学学院北京102249 广州海洋地质调查局天然气水合物勘查开发国家工程研究中心广州510075

天然气水合物赋存区沉积物地球化学特征是揭示天然气水合物气源成因与演化机制的重要依据之一。基于琼东南海域GMGS5-W08和GMGS5-W09天然气水合物钻探站位沉积物样品的总有机碳含量(TOC)测定、Rock-Eval岩石热解分析和可溶有机质的气相... 详细信息

天然气水合物赋存区沉积物地球化学特征是揭示天然气水合物气源成因与演化机制的重要依据之一。基于琼东南海域GMGS5-W08和GMGS5-W09天然气水合物钻探站位沉积物样品的总有机碳含量(TOC)测定、Rock-Eval岩石热解分析和可溶有机质的气相色谱—质谱分析结果,系统分析了沉积物有机质的地球化学特征,并阐述其对天然气水合物储层烃类来源及演化的指示意义。TOC和Rock-Eval分析结果显示琼东南海域天然气水合物赋存区沉积物的总有机碳含量较低(0.29%~0.68%,平均为0.48%),且处于未成熟阶段(Tmax值分布于435℃以内),指示浅层原位沉积物基本无热解生烃潜力。沉积物可溶有机质成熟度参数表现出显著的非一致性:Tmax、正构烷烃奇碳优势、高丰度的C29-31ββ藿烷等地球化学特征指示有机质处于未成熟阶段,而部分饱和烃和芳烃的生物标志物等参数却显示有机质处于低熟—成熟阶段,说明琼东南海域水合物赋存区沉积物中,同时存在原位沉积的未成熟有机质和深部来源的低熟—成熟有机质的双重贡献;此外,ΣC21-/ΣC22+、TAR和甾烷等指示有机质母质来源方面的生物标志物参数,也表明了研究区沉积物中存在明显的深部成熟海相有机质的混入。琼东南海域天然气水合物赋存区沉积物和深部烃源岩的生物标志物特征对比结果表明:研究区沉积物中的热解成因烃类物质主要来源于深部,处于低熟—成熟阶段的梅山组和三亚组海相泥质烃源岩,说明琼东南海域深部地层中处于低熟—成熟阶段的烃源岩对天然气水合物气源供给具有重要的贡献作用。

关键词：生物标志物成熟度沉积物天然气水合物琼东南海域

基于DE-MCMC方法的滑坡堆积体土壤水力参数反演研究

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灾害学 2024年第3期39卷 48-53页

作者：蔡忠周严海文李美骏邵伟杨宗佶南京信息工程大学水文与水资源工程学院江苏南京210044 水利部水文气象灾害机理与预警重点实验室江苏南京210044 青海省气象灾害防御技术中心青海西宁810000 中国科学院水利部成都山地灾害与环境研究所四川成都610041

极端降雨条件下,入渗可急剧增大滑坡体中软弱结构面上的土壤含水量和孔隙水压力,是触发滑坡的重要因素。因此,土壤水动力模拟是滑坡预警系统的核心,其模拟结果的准确与否取决于土壤渗透特性的参数化。该文以汶川地震扰动区的银洞子滑坡... 详细信息

极端降雨条件下,入渗可急剧增大滑坡体中软弱结构面上的土壤含水量和孔隙水压力,是触发滑坡的重要因素。因此,土壤水动力模拟是滑坡预警系统的核心,其模拟结果的准确与否取决于土壤渗透特性的参数化。该文以汶川地震扰动区的银洞子滑坡堆积体为例,以土壤含水量野外观测数据为基础,基于Richards方程构建入渗模型,利用自适应差分演化算法的马尔科夫链蒙特卡罗方法(Differential Evolution Markov chain Monte Carlo,简称DE-MCMC)反演van Genuchten土壤水力参数。通过比较土壤含水量的模拟值与实测值的拟合程度,评估DEMCMC算法在土壤水动力模拟中的适用性。结果表明,基于DE-MCMC算法反演的后验参数极大降低了先验参数分布的不确定性,并显著提升土壤含水量的模拟精度。将DE-MCMC方法应用于滑坡水文,可有效率定土壤渗透特性参数,为降雨型滑坡预警提供更为可靠的土壤水动力模拟结果。

关键词：滑坡堆积体土壤水分特征曲线参数反演 van Genuchten模型 DE-MCMC算法 Richards方程

Geochemical characteristics and oil family classi-fication of crude oils from the Markit Slope in the southwest of the Tarim Basin, Northwest China

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Chinese Journal Of Geochemistry 2011年第3期30卷 359-365页

作者： CUI Jmgwei WANG Tieguan li meijun State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing 102249 China

Based on the chromatograms of oils and saturated hydrocarbons, biomarkers and stable carbon isotope analyses, the geochemical characteristics and oil family Classification of crude oils from the Markit Slope in the southwest of the Tarim Basin were investigated. The results showed that crude oils from the Markit Slope are divided into two oil family Classification. Oils collected from the Bashituo oilfield in the western part of the Markit Slope are characterized by high contents of tricyclic terpanes, pregnane, and homopregnane, low contents of garmmacerane (G/Hlight stable carbon isotopic values (the δ13C values of satu-rated hydrocarbons and aromatic components are less than -34‰ and -32‰, respectively), with the distribution type of steranes being C27>>C28lic terpanes, pregnane, and homopregnane, high contents of garmmacerane (0.20 -32‰ and -30.6‰, respectively), with the distribution type of steranes being C27>C28<

关键词：麦盖提斜坡地球化学特征塔里木盆地中国西北地区西南部分类家庭原油

In situ spectroscopic insights into the redox and acid-base properties of ceria catalysts

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Chinese Journal of Catalysis 2021年第12期42卷 2122-2140页

作者： Xiang Wang meijun li Zili Wu Chemical Science Division Oak Ridge National LaboratoryOak RidgeTennessee 37831United States

Cerium oxide(ceria)plays an important and fascinating role in heterogeneous catalysis as illustrated by its versatile use as a catalyst,a catalyst support,or a promotor in various oxidation and reduction *** to these reactions is the rich defect chemistry,facile redox capability,and unusual acid-base properties of *** the unique redox and acid-base properties of ceria is essential to build the structure-catalysis relationship so that improved catalytic functions can be achieved for ceria-based *** the characterization toolbox,spectroscopic approach indisputably stands out for its unparalleled power in offering chemical insights into the surface properties of ceria at atomic and molecular *** this review,we summarize advances in revealing the redox and acid-base properties of ceria via a variety of spectroscopic methods including optical,X-ray,neutron,electronic and nuclear *** direct spectroscopy characterization and its coupling with probe molecules are analyzed to illustrate how the nature,strength and density of different surface sites are influenced by the pretreatment,the morphology and size of ceria *** directions in taking advantage of in situ/operando spectroscopy for better understanding the catalysis of ceria-based materials are proposed in the summary and outlook section.

关键词： Ceria Redox Acid-base Defects Spectroscopy Catalysis

Geochemical studies of the Silurian oil reservoir in the Well Shun-9 prospect area, Tarim Basin, NW China

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Petroleum Science 2013年第4期10卷 432-441页

作者： Song Daofu li meijun Wang T.–G State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum

Commercial oil flow has been obtained from the sandstone reservoir of the Lower Silurian Kelpintag Formation in the Well Shun-9 prospect *** the present studies,10 Silurian oil and oil sand samples from six wells in the area were analyzed for their molecular and carbon isotopic compositions,oil alteration（biodegradation）,oil source rock correlation and oil reservoir filling *** the Silurian oils and oil sands are characterized by low Pr/Ph and C21/C23 tricyclic terpane（〈1.0） ratios,＂V＂-pattern C27-C29 steranes distribution,low C28-sterane and triaromatic dinosterane abundances and light δ13C values,which can be correlated well with the carbonate source rock of the O3 l lianglitage *** oil biodegradation levels have also been confirmed for the different oils/oil sands *** the S1k2 seal,oils and oil sands from the S1k1 interval of the Kelpintag Formation have only suffered light biodegradation as confirmed by the presence of ＂UCM＂ and absence of 25-norhopanes,whereas the S1k3-1 oil sands were heavily biodegraded（proved by the presence of 25-norhopanes） due to the lack of the S1k2 seal,which suggests a significant role of the S1k2 seal in the protection of the Silurian oil *** on the Ts/（Ts＋Tm） and 4-/1-MDBT ratios as reservoir filling tracers,a general oil filling direction from NW to SE has been also estimated for the Silurian oil reservoir in the Well Shun-9 prospect area.

关键词： Silurian oil reservoir Well Shun-9 prospect area geochemistry oil source rock correlation alteration oil reservoir filing direction

Quantitative assessment and significance of gas washing of oil in Block 9 of the Tahe Oilfield,Tarim Basin,NW China

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Chinese Journal Of Geochemistry 2012年第2期31卷 165-173页

作者： CUI Jingwei WANG Tieguan WANG Chunjiang li meijun PetroChina Research Institute of Petroleum Exploration ＆ Development PetroChina Beijing 100083 China State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing 102249 China

Some Ordovician and Triassic oils in Block 9 are characterized by light oils,which have distinctly differentiated from heavy oils in other blocks in the Tahe Oilfield,Tarim *** on the whole oil gas chroma- tograms,this paper estimates the effect of oil migration and fractionation and the amount of depletion(Q)in terms of the n-alkanes depletion *** results showed that the amount of depletion in the Ordovician reservoir is highest in the east of this block,*** depletion is 97% in Well *** amount of Q gets lower to the west,*** depletion is 53.4%in Well T115 and there is no sign of depletion in Well *** is suggested that the direction of gas washing is from the east to the *** compositions and isotopic characteristics of associated gas in Ordovician oils indicated that the gas might be derived from Cambrian source rocks of the Caohu Depression which lies to the east of Block *** contrast,no obvious depletion of n-alkanes in Triassic oils was found,suggesting that the migration pathway of natural gas has been limited to the Ordovician karst fracture system formed in the Early Hercynian *** depletions of the Ordovician and Triassic oils can reveal fault activities in this region.

关键词：塔里木盆地塔河油田定量评估气体中国西北奥陶系油藏洗油正构烷烃

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原油裂解的反应分子动力学模拟研究进展

长江大学学报（自然科学版） 2024年第3期21卷 76-85页

作者：李美俊陈浩琛李凤麒刘晓强中国石油大学(北京)克拉玛依校区石油学院新疆克拉玛依834000 油气资源与工程全国重点实验室(中国石油大学(北京)) 北京102249

反应分子动力学(Reaction Force Field Molecular Dynamics,ReaxFF MD)模拟通过在键级描述化学反应过程中键的断裂和形成,从微观尺度探索复杂的反应机理,弥补了实验研究的不足。该方法已广泛应用于油气地球化学领域,例如干酪根的生烃演... 详细信息

反应分子动力学(Reaction Force Field Molecular Dynamics,ReaxFF MD)模拟通过在键级描述化学反应过程中键的断裂和形成,从微观尺度探索复杂的反应机理,弥补了实验研究的不足。该方法已广泛应用于油气地球化学领域,例如干酪根的生烃演化、原油的裂解和相态演化等。本文系统总结和评述了原油裂解反应动力学分子模拟的现状、进展以及未来的发展趋势。首先,对原油各组分的裂解动力学特征、裂解过程、产物分布、生成途径以及热解初始反应机理方面取得的成果进行了总结,并分析了该领域目前存在的挑战及未来的发展方向。尽管分子模拟是研究原油裂解机理的有力工具,但目前仍处于初步研究阶段。现有的研究多采用原油中的某单一组分作为代表,并侧重于考查温度对原油裂解的影响,而对各组分间的相互作用、压力、介质条件和储层环境的影响研究尚不充分。未来的研究应聚焦于构建复杂真实的原油模型,还原地质条件下的原油裂解过程,并将分子模拟、实验和地质研究相结合,为系统研究油气的裂解机理提供重要参考和有用指导。当前的分子模拟研究表明,原油各组分的裂解动力学、裂解产物和裂解过程与实验结果基本一致。与此同时,分子模拟能够追踪自由基、过渡态以及中间体结构,并获取成键特征、活化能、选择性等重要信息。因此,分子模拟可以准确刻画各类烃分子的初始反应路径,并解释裂解产物的差异性。

关键词：反应分子动力学(ReaxFF MD) 原油裂解热解实验热解机理

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Oil maturity assessment using maturity indicators based on methylated dibenzothiophenes

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Petroleum Science 2014年第2期11卷 234-246页

作者： li meijun Wang T.-G Shi Shengbao Zhu Lei Fang Ronghui State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum College of Geosciences China University of Petroleum

Aromatic fractions of 140 oils and condensates that originated from different types of source rocks （marine shale,terrestrial shale and marine carbonate） were analyzed using gas chromatographymass spectrometry （GC-MS） to investigate the relative distributions of methylated dibenzothiophenes with respect to thermal *** positions of methyl groups of trimethyldibenzothiophene isomers （TMDBTs） including those used in the definition of maturity indicator TMDBT index in previous studies were firmly identified by co-elution of internal standards in GC-MS analysis and by comparing with reported retention indices.A new maturity ratio related to dimethyldibenzothiophenes （DMDBTs） is proposed on the basis of the differences in thermodynamic stability among different DMDBT *** maturity index （TMDBT-I2） based on TMDBTs is also suggested on the basis of our empirical observations and presumed thermodynamic stability of TMDBT *** two newly proposed （2,6 ＋ 3,6）-/1,4-DMDBT ratio and TMDBT-I2 correlate well with MDR （4-/1-methyldibenzothiophene）and 2,4-/1,4-DMDBT ratios,suggesting their common chemical reaction mechanisms and similar behavior with increasing ***,they can be effectively applied for maturity ***,the TMDBTs related maturity parameters are more reliable for over-mature oils and condensates due to the relatively higher concentrations of thermodynamically unstable TMDBT isomers,i.e.1,4,6-,1,4,8-and 3,4,6-TMDBT in this study than those of 1-methyldibenzothiophene （1-MDBT） or 1,*** contrast with 4,6-/1,4-DMDBT,the newly proposed （2,6 ＋ 3,6）-/1,4-DMDBT ratios for oils that originated from different types of source rocks have approximately same relationship with the oil maturity （Rc %）.This suggests that the lithology and organic facies may have relatively less influence on （2,6 ＋ 3,6）-/1,4-DMDBT ratio compared to 4,6-/1,*** maturity parameters based on methylated dibenzothiophenes are particularl

关键词： Dibenzothiophene maturity indicator molecular thermodynamic stability sedimentaryorganic matter

中国服务业开放对制造业性别工资差距的影响——基于中国工业企业数据库的实证研究

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中国商论 2024年第18期33卷 124-128页

作者：张媛媛连增李美君北京外国语大学国际商学院北京100089

基于服务业与制造业两业融合的视角,文章从服务业开放的角度实证检验了中国服务业开放对制造业性别工资差距的影响及其作用机制。结果表明:中国的服务业开放会通过成本机制、全要素生产率机制和出口机制三条路径,显著缩小制造业企业中... 详细信息

基于服务业与制造业两业融合的视角,文章从服务业开放的角度实证检验了中国服务业开放对制造业性别工资差距的影响及其作用机制。结果表明:中国的服务业开放会通过成本机制、全要素生产率机制和出口机制三条路径,显著缩小制造业企业中存在的性别工资差距。在实证分析的基础上,国家层面应继续扩大服务业开放程度,促进制造业行业内和不同地区均衡发展,并从企业成本和生产率入手继续缩小性别工资差距。

关键词：服务业开放制造业性别工资差距女性就业服务业

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