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伊拉克BU油田碳酸盐岩储层沉积过程数值模拟 预览
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作者 王鹏飞 霍春亮 +2 位作者 叶小明 刘卫林 徐静 《油气地质与采收率》 CAS CSCD 北大核心 2019年第4期56-61,共6页
综合利用岩心、地震、测井及分析化验等资料,分析BU油田碳酸盐岩沉积环境的控制因素,开展储层沉积过程数值模拟研究,定量表征不同沉积时期储层展布范围及沉积演化规律。研究结果表明,碳酸盐岩储层沉积过程数值模拟的可容空间变化、碳酸... 综合利用岩心、地震、测井及分析化验等资料,分析BU油田碳酸盐岩沉积环境的控制因素,开展储层沉积过程数值模拟研究,定量表征不同沉积时期储层展布范围及沉积演化规律。研究结果表明,碳酸盐岩储层沉积过程数值模拟的可容空间变化、碳酸盐岩产率等环境参数对储层分布范围的影响较大。BU油田Mishirif组MB2^1段纵向上分为Ⅰ—Ⅵ共6个小层,高能沉积带与低能沉积带交替出现,其中高能沉积带岩性主要为颗粒灰岩,在顶部Ⅰ小层较发育,而低能沉积带岩性主要为泥晶灰岩,并有高角度微裂缝发育,在Ⅵ小层底部发育。该研究成果为BU油田底注顶采的注水开发方案提供地质依据,已完成4口井方案实施,恢复了地层压力,缓解了局部压力亏空现象,整体日产油能力提高近19%,达0.94×10^4m^3/d。 展开更多
关键词 碳酸盐岩 沉积过程数值模拟 可容空间 碳酸盐岩产率 BU油田 米桑油田群
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Quantifying the carbon source of pedogenic calcite veins in weathered limestone:implications for the terrestrial carbon cycle
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作者 Lin Zou Lin Dong +5 位作者 Meng Ning Kangjun Huang Yongbo Peng Shujian Qin Honglin Yuan Bing Shen 《中国地球化学学报:英文版》 EI CAS CSCD 2019年第4期481-496,共16页
The continent is the second largest carbon sink on Earth’s surface.With the diversification of vascular land plants in the late Paleozoic,terrestrial organic carbon burial is represented by massive coal formation,whi... The continent is the second largest carbon sink on Earth’s surface.With the diversification of vascular land plants in the late Paleozoic,terrestrial organic carbon burial is represented by massive coal formation,while the development of soil profiles would account for both organic and inorganic carbon burial.As compared with soil organic carbon,inorganic carbon burial,collectively known as the soil carbonate,would have a greater impact on the long-term carbon cycle.Soil carbonate would have multiple carbon sources,including dissolution of host calcareous rocks,dissolved inorganic carbon from freshwater,and oxidation of organic matter,but the host calcareous rock dissolution would not cause atmospheric CO2drawdown.Thus,to evaluate the potential effect of soil carbonate formation on the atmospheric p CO2level,different carbon sources of soil carbonate should be quantitatively differentiated.In this study,we analyzed the carbon and magnesium isotopes of pedogenic calcite veins developed in a heavily weathered outcrop,consisting of limestone of the early Paleogene Guanzhuang Group in North China.Based on the C and Mg isotope data,we developed a numerical model to quantify the carbon source of calcite veins.The modeling results indicate that4–37 wt%of carbon in these calcite veins was derived from atmospheric CO2.The low contribution from atmospheric CO2might be attributed to the host limestone that might have diluted the atmospheric CO2sink.Nevertheless,taking this value into consideration,it is estimated that soil carbonate formation would lower 1 ppm atmospheric CO2within 2000 years,i.e.,soil carbonate alone would sequester all atmospheric CO2within 1 million years.Finally,our study suggests the C–Mg isotope system might be a better tool in quantifying the carbon source of soil carbonate. 展开更多
关键词 Mg isotope CALCITE VEINS Pedogenic CARBONATE SILICATE WEATHERING CARBONATE WEATHERING
Synthesis of Poly(isosorbide carbonate) via Melt Polycondensation Catalyzed by a KF/MgO Catalyst
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作者 SHEN Xiaolong LIU Shaoying +2 位作者 WANG Qingyin ZHANG Hua WANG Gongying 《高等学校化学研究:英文版》 SCIE CAS CSCD 2019年第4期721-728,共8页
MgO loaded with KF was prepared by using tlie impregnation method and was employed as the catalyst for tlie direct traiisesterification of diphenyl carbonate(DPC) witli isosorbide to synthesize high-molecular-weight p... MgO loaded with KF was prepared by using tlie impregnation method and was employed as the catalyst for tlie direct traiisesterification of diphenyl carbonate(DPC) witli isosorbide to synthesize high-molecular-weight poly(isosorbide carbonate)(PIC). The relationship between physical-chemical properties and catalytic performance for KF/MgO in this melt process was investigated by various characterization techniques. The basic site amount and strength were found to be responsible for this transesterification process, and the medium and strong basic sites tended to promote the polycondensation reaction. 20-KF/Mg0-500 exhibited the best catalytic performance, giving PIC with Mw of 84200 and glass transition temperature(rg) of 173℃ under optimal conditions. Additionally, 20-KF/MgO-500 was found to catalyze the transerification of DPC with isosorbide and other diols to syntliesize the corresponding poly(aliphatic diol-co-isosorbide carbonate)s(PAICs). This excellent activity can be ascribed to the presence of an abundance of basic sites and their specific basic strength on the surface of KF/MgO. 展开更多
关键词 KF/MgO Poly(isosorbide carbonate) DIPHENYL CARBONATE Transesterification Solid base
Synthesis and Properties of Poly(butylene carbonate-co-spirocyclic carbonate)
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作者 ZHU Changliang LIU Shaoying +1 位作者 WANG Qingyin ZHANG Hua 《高等学校化学研究:英文版》 SCIE CAS CSCD 2019年第4期729-734,共6页
Poly(butylene carbonateXPBC) has significantly promising applications as a degradable material in the field of polymers, while its poor thermal performance and low crystallization rate are its main defects. To overcom... Poly(butylene carbonateXPBC) has significantly promising applications as a degradable material in the field of polymers, while its poor thermal performance and low crystallization rate are its main defects. To overcome these shortcomings, a series of poly(butylene carbonate-co-spirocyclic carbonateXPBSC) copolymers were synthesized from diphenyl carbonate, 1,4-butanediol and spiroglycol via two-step polycondensation reactions, using magnesium oxide as a catalyst. Differential scanning calorimetry(DSC) results indicated that the glass transition temperature(Tg) values of PBSC copolymers were enhanced from -19℃ to 56℃ with rising the spiroacetal moiety content. Thermogravimetric analysis(TGA) results showed that the resulting PBSCs have a higher thermal stability than that of poly(butylene carbonate). Wide angle X-ray diflraction(WXRD) patterns were characterized to investigate the crystallization behaviour of PBSCs. Tensile testing demonstrated that copolymerization of spiroacetal moieties into PBC chains imparted PBSC with favourable mechanical performance. Typically, PBSC 30 had a tensile modulus of (1735±430) MPa, a tensile strength of (42±5) MPa and an elongation of 504%±36%. 展开更多
关键词 Poly(butylene carbonate) Spiroglycol DIPHENYL CARBONATE THERMAL PROPERTY
Genesis of lacustrine carbonate breccia and its significance for hydrocarbon exploration in Yingxi region, Qaidam Basin, NW China 预览
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作者 WANG Yanqing LIU Zhanguo +5 位作者 SONG Guangyong ZHANG Yongshu ZHU Chao LI Senming WANG Peng TANG Pengcheng 《石油勘探与开发:英文版》 2019年第1期104-112,共9页
To examine the reservoir type and distribution regularity of high-and stable-yield lacustrine carbonates in the upper Member of Paleogene Xiaganchaigou Formation of Yingxi region and to determine the high-efficiency h... To examine the reservoir type and distribution regularity of high-and stable-yield lacustrine carbonates in the upper Member of Paleogene Xiaganchaigou Formation of Yingxi region and to determine the high-efficiency hydrocarbon exploration direction, the origin and significance of carbonate breccia in this area were investigated based on comprehensive analysis of a large number of well cores, thin sections, rock and mineral testing and log-seismic data. The study reveals that the carbonate breccia has three origins:(1) Sedimentary breccia, formed by the event-related collapse, fragmentation and re-deposition of the early weakly consolidated carbonate rock in the steep slope of underwater paleohighs due to short-term high-energy water body reformation and other geological processes.(2) Diagenetic breccia, with breccia-like structure, formed by deformation or breaking of host rock due to growth of idiomorphic and coarse crystalline gypsum-salt minerals in the weakly consolidated argillaceous carbonate rock of the penecontemporaneous period.(3) Tectonic breccia, can be further divided into fault breccia and interlayer slip breccia according to their occurrence characteristics, both of which are closely related to activity of the Shizigou thrust Fault. With a large number of partially filled pores, vugs and fractures between breccia, the two types of tectonic breccia are high-and stable-yield reservoirs in deep Yingxi region, and may occur extensively under gypsum-salt detachment layers of adjacent areas, so they are the exploration targets in the next step. Sedimentary breccia and diagenetic breccia are of great significance in searching for large-scale carbonate reservoirs. 展开更多
关键词 Qaidam Basin Yingxi REGION LACUSTRINE CARBONATE CARBONATE BRECCIA reservoir origin PALEOGENE
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助剂Cr对Cu/SiO2催化碳酸酯加氢制甲醇性能的影响
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作者 李华博 崔园园 +1 位作者 刘逸心 戴维林 《化学学报》 SCIE CAS CSCD 北大核心 2019年第4期371-378,共8页
碳酸酯催化加氢制甲醇作为二氧化碳定向转化的间接路径具有重要意义.采用蒸氨法合成了一系列助剂铬修饰的Crx-Cu/SiO2 催化剂,系统考察了其对碳酸二乙酯催化加氢性能的影响.研究表明, 3 wt%铬修饰量的催化剂活性最优.在反应温度503 K、... 碳酸酯催化加氢制甲醇作为二氧化碳定向转化的间接路径具有重要意义.采用蒸氨法合成了一系列助剂铬修饰的Crx-Cu/SiO2 催化剂,系统考察了其对碳酸二乙酯催化加氢性能的影响.研究表明, 3 wt%铬修饰量的催化剂活性最优.在反应温度503 K、氢气压力2.5 MPa 及液时空速1.0 h^-1 条件下,碳酸二乙酯的转化率可达99%,目标产物甲醇的收率和时空得率分别为86.2%和5.6 mmolMeOH·gcat^-1·h^-1.采用X 射线粉末衍射(XRD)、N2吸脱附、透射电镜(TEM)、氢气程序升温还原(H2-TPR)、X 射线光电子能谱(XPS)和原位漫反射傅里叶变换红外光谱(In-situ DRIFTS)等手段表征了铬的修饰对催化剂物化性质的影响.结果表明,相较于未修饰的Cu/SiO2催化剂,少量铬修饰所得Crx-Cu/SiO2催化剂表面活性铜物种的分散度显著提高,且由部分铜和铬相互作用形成的亚铬酸铜物相优化了不同价态铜物种的表面分布状况及催化剂对底物的吸附构型,有效提升了其对碳酸二乙酯催化加氢制甲醇的反应性能和稳定性. 展开更多
关键词 Crx-Cu/SiO2 碳酸酯 加氢 分散性 促进效应
碳酸盐(岩)的稀土元素特征及其古环境指示意义 预览
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作者 赵彦彦 李三忠 +3 位作者 李达 郭玲莉 戴黎明 陶建丽 《大地构造与成矿学》 EI CAS CSCD 北大核心 2019年第1期141-167,共27页
稀土元素主要通过交代碳酸盐矿物的Ca^2+进入碳酸盐格架,所以沉积碳酸盐(岩)的稀土元素特征能够很好的指示沉积流体来源和古环境。常用的稀土元素指标包括稀土元素总量(ΣREE)、稀土元素配分型式、以及La、Ce、Eu、Gd和Y等元素的异常指... 稀土元素主要通过交代碳酸盐矿物的Ca^2+进入碳酸盐格架,所以沉积碳酸盐(岩)的稀土元素特征能够很好的指示沉积流体来源和古环境。常用的稀土元素指标包括稀土元素总量(ΣREE)、稀土元素配分型式、以及La、Ce、Eu、Gd和Y等元素的异常指数。碳酸盐(岩)的稀土元素含量可能受到硅酸盐矿物、Fe-Mn氧化物/氢氧化物和磷酸盐等非碳酸盐组分以及成岩蚀变作用的影响。因此,在分析过程中,我们只有排除这些影响因素,才能用碳酸盐(岩)的稀土元素指标来探讨流体来源和古环境。这要求我们采集新鲜剖面上的样品,并用适当浓度的弱酸进行分步溶样,提取适当的组分,避免样品中的非碳酸盐组分干扰原始沉积组分的稀土元素特征。不同的沉积水体和沉积相下形成的碳酸盐(岩)具有不同的稀土元素特征:从太古宙到全新世的海相碳酸盐(岩)记录了LREE亏损、La正异常和高Y/Ho值的稀土元素特征;海底孔隙水的稀土元素特征则受氧化-还原条件、离子络合形式、孔隙流体来源的制约;热液流体具有LREE富集、Eu正异常的稀土元素特征;河水和湖泊有相对平坦的稀土元素特征。因此,碳酸盐(岩)的稀土元素特征具有重要的古环境指示意义。 展开更多
关键词 碳酸盐岩 稀土元素 古环境 元素异常 流体
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Absorption Characteristics of Novel Compound Calcium Carbonate Granules:Effects of Gastric Acid Deficiency and Exogenous Weak Acids 预览
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作者 Hong-dan CHEN Yi-ping CHEN +3 位作者 Rui XIE Qin-yu HU Qi CHENG Ming XIANG 《当代医学科学(英文)》 SCIE CAS 2019年第2期337-342,共6页
Calcium carbonates are commonly administered as supplements for conditions of calcium deficiency.We report here pharmacokinetic characteristics of a novel formulation,calcium carbonate compound granules(CCCGs).forming... Calcium carbonates are commonly administered as supplements for conditions of calcium deficiency.We report here pharmacokinetic characteristics of a novel formulation,calcium carbonate compound granules(CCCGs).forming complexes of calcium carbonate and calcium citrate in water.CCCGs were compared to a kind of commonly?used calcium carbonate preparation(CC)in the market in 5-week-old mice that had been treated with omeprazole,to suppress gastric acid secretion,and in untreated control mice.The results showed that:(1)CCCGs had better water solubility than CC in vitro;(2)In control mice,calcium absorption rates after CCCGs administration were comparable to those after CC administration;(3)Inhibition of gastric acid secretion did not affect calcium absorption after CCCGs,but moderately decreased it after CC;(4)The presence of phytic acid or tannin did not affect calcium absorption rates after CCCGs but did for CC;and(5)In nonnal mice,CCCGs did not inhibit gastric emptying and intestinal propulsion,and did not alter the gastrointestinal honnones.The results suggest that CCCGs may be therapeutically advantageous over more commonly used calcium supplement formulations,particularly for adolescents,because of their stable calcium absorption characteristics and their relatively favorable adverse effect profile. 展开更多
关键词 CALCIUM carbonate gastric ACID inhibition phytic ACID TANNIN CALCIUM absorption
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Microbial response to CaCO3 application in an acid soil in southern China
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作者 Anning Guo Longjun Ding +2 位作者 Zhong Tang Zhongqiu Zhao Guilan Duan 《环境科学学报:英文版》 SCIE EI CAS CSCD 2019年第5期321-329,共9页
Calcium carbonate(CaCO3) application is widely used to ameliorate soil acidification. To counteract soil and bacterial community response to CaCO3 application in an acidic paddy soil in southern China, a field experim... Calcium carbonate(CaCO3) application is widely used to ameliorate soil acidification. To counteract soil and bacterial community response to CaCO3 application in an acidic paddy soil in southern China, a field experiment was conducted with four different dosages of CaCO3 addition, 0, 2.25, 4.5 and 7.5 tons/ha, respectively. After one seasonal growth of rice, soil physicochemical properties, soil respiration and bacterial communities were investigated. Results showed that soil p H increased accordingly with increasing dose of CaCO3 addition, and 7.5 tons/ha addition increased soil p H to neutral condition. Moderate dose of CaCO3 application(4.5 tons/ha) significantly increased soil dissolved organic carbon(DOC) and dissolved organic nitrogen(DON) content, enhanced soil respiration, while the excessive CaCO3 application(7.5 tons/ha) decreased these soil properties. High-throughput sequencing results illustrated that moderate dose of CaCO3 application increased the richness and alpha diversity of soil bacterial community. Compared with control, the relative abundance of Anaerolineaceae family belonging to Chloroflexi phylum increased by 38.7%, 35.4% and 24.5% under 2.25, 4.5 and 7.5 tons/ha treatments, respectively.Redundancy analysis(RDA) showed that soil p H was the most important factor shaping soil bacterial community. The results of this study suggest that proper dose of CaCO3 additions to acid paddy soil in southern China could have positive effects on soil properties and bacterial community. 展开更多
关键词 SOIL ACIDIFICATION Calcium CARBONATE SOIL RESPIRATION SOIL bacterial community HIGH-THROUGHPUT sequencing
CO2 degassing and melting of metasomatized mantle lithosphere during rifting-Numerical study 预览
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作者 Weronika Gorczyk Christopher M. Gonzalez 《地学前缘:英文版》 CAS CSCD 2019年第4期1409-1420,共12页
:Reactivation of metasomatized mantle lithosphere may occur during continental extension,which is an important component of plate tectonics.The lower most part of the metasomatized domains in the subcontinental mantle... :Reactivation of metasomatized mantle lithosphere may occur during continental extension,which is an important component of plate tectonics.The lower most part of the metasomatized domains in the subcontinental mantle lithosphere can be locally enriched in CO2.Therefore,partial melting of these metasomatized domains may play a crucial role in the global carbon cycle.However,little is known about this process and up until now few numerical constraints are available.Here we address this knowledge gap and use a 2-D high resolution petrological-thermomechanical model to assess lithospheric rifting.CO2 degassing and melting.We test 4 lithospheric thicknesses:90,110,130 and 200 km with a 10 km thick metasomatized layer at the base using CO2 of 2 wt.%in the bulk composition.The carbonate enriched layer is stable below~3 GPa(>110 km)for a temperature of 1300℃;therefore,we only observe degassing patterns for lithospheric models that are 130 km and 200 km thick.The metasomatized layer for the 130 km thick lithosphere mostly comprises carbonatite melting,whereas in the 200 km thick scenario propagation of melt development from kimberlites to carbonatites occurs as the metasomatic mantle is exhumed during extension.The numerical models fit well into natural rifting zones of the European Cenozoic Rift System for young(shallow)and of the North Atlantic Rift for old(thick)lithosphere. 展开更多
关键词 RIFTING MANTLE CO2 DEGASSING CARBONATE MELTING
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西太平洋暖池核心区新不列颠海沟有机质来源及碳酸盐含量变化 预览
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作者 林刚 陈琳莹 +1 位作者 罗敏 陈多福 《地球化学》 CAS CSCD 北大核心 2019年第2期138-148,共11页
深海有机质的来源与演化及其碳酸盐含量变化是碳循环的重要环节之一。通过分析新不列颠海沟水深3908m采集的柱状沉积物总有机碳(TOC)和总氮(TN)的含量、有机碳的δ^13C值和AMS-14C定年以及CaCO3含量变化,探讨该海区的有机质来源与演化... 深海有机质的来源与演化及其碳酸盐含量变化是碳循环的重要环节之一。通过分析新不列颠海沟水深3908m采集的柱状沉积物总有机碳(TOC)和总氮(TN)的含量、有机碳的δ^13C值和AMS-14C定年以及CaCO3含量变化,探讨该海区的有机质来源与演化及碳酸盐含量变化与控制因素。研究发现:(1)该地区的有机质主要来源于海洋自生有机质,但受到陆源有机质输入的影响,其中在末次冰消期和全新世早期,海平面相对较低,但海平面逐渐上升会带来部分侵蚀的陆源土壤输入,而且作为降水带的赤道辐合带(ITCZ)位置偏南引起的陆源剥蚀物质输入增强,使陆源有机质贡献比例较高,主要来自巴布亚新几内亚森林土壤的有机质贡献;(2)该地区的CaCO3含量在末次冰消期以来呈现出末次冰消期和全新世中晚期较低,而全新世早中期较高的特征,其变化主要受海平面变化和ITCZ迁移引起的陆源碎屑物质输入强弱的影响。 展开更多
关键词 有机质来源 碳酸盐 新不列颠海沟 西太平洋暖池核心区
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碳酸盐岩缝合线研究进展及对油气开发的意义
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作者 李长海 赵伦 +4 位作者 李伟强 李建新 丁宇韬 李昂 祁永平 《天然气地球科学》 EI CAS CSCD 北大核心 2019年第4期493-502,共10页
缝合线是碳酸盐岩地层中常见的一类沉积构造,其对油气开发的重要影响受到国内外学者的持续关注。通过调研国内外学者对碳酸盐岩地层中缝合线的研究成果,从缝合线的分类和成因、缝合线的发育和分布特征以及缝合线对储集层物性的影响等方... 缝合线是碳酸盐岩地层中常见的一类沉积构造,其对油气开发的重要影响受到国内外学者的持续关注。通过调研国内外学者对碳酸盐岩地层中缝合线的研究成果,从缝合线的分类和成因、缝合线的发育和分布特征以及缝合线对储集层物性的影响等方面,对缝合线的研究现状及对油气开发意义进行了探讨。结果表明,依据储集层连通性的好坏对缝合线进行分类正成为主流,其考虑了缝合线的开发特征,优于依据缝合线几何形态和与层面关系等的分类方法;缝合线的成因仍然存在较大争议,集中在缝合线的形成机理、锯齿状成因以及缝合线的形成时间等方面;经溶蚀作用等改造的缝合线不仅可在三维空间与其他类型的裂缝形成网状连通体系,而且其可提高储集层流体的渗流能力,对灰岩储层油气开发意义重大。对改造后的缝合线进行研究将是下一步缝合线研究的重点。 展开更多
关键词 碳酸盐岩 缝合线 分类 成因 分布特征 物性
Applications of Light Stable Isotopes(C,O,H)in the Study of Sandstone Diagenesis:A Review 预览
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作者 XI Kelai CAO Yingchang +4 位作者 LIN Miruo LIU Keyu WU Songtao YUAN Guanghui YANG Tian 《地质学报:英文版》 SCIE CAS CSCD 2019年第1期213-226,共14页
This article reviews the applications of light stable isotope,including carbon,oxygen and hydrogen,in the studies on origin and formation temperature of authigenic carbonate,quartz and clay minerals.Theoretical knowle... This article reviews the applications of light stable isotope,including carbon,oxygen and hydrogen,in the studies on origin and formation temperature of authigenic carbonate,quartz and clay minerals.Theoretical knowledge and analytical methods for major light stable isotopes are introduced in detail.Negative and positiveδ13C values indicate significant differences on the origin of carbonate cements.Theδ18O value is an effective palaeotemperature scale for authigenic minerals formation.Various fractionation equations betweenδ18O and temperature are proposed for carbonate cements,quartz cements and clay minerals,whose merit and demerit,applicable conditions are clarified clearly.Clumped isotope analysis can reconstruct the temperature of carbonate precipitation with no requirement on theδ18O of initial waters,which makes temperature calculation of carbonate cements formation more convenient and accurate.Hydrogen and oxygen isotopes mainly reflect the origin of diagenetic fluid for clay mineral formation,providing reliable evidence for diagenetic environment analysis.This work aims at helping researchers for better understanding the applications of light stable isotope in sandstone diagenesis. 展开更多
关键词 LIGHT stable ISOTOPES carbonate CEMENTS quartz CEMENTS clay minerals SANDSTONE DIAGENESIS
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Carbonate pore type characterization using a statistical inversion method 预览
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作者 LI Bonan 《世界地质:英文版》 2019年第1期21-28,共8页
For carbonate reservoirs, vertical pore type heterogeneity records regional depositional history. However, from the geophysics point of view, these microscopic characteristics cannot be described with conventional dat... For carbonate reservoirs, vertical pore type heterogeneity records regional depositional history. However, from the geophysics point of view, these microscopic characteristics cannot be described with conventional data-driven approaches. The author presents an upscale rock physics model which includes both modeling and inverting schemes in this study. According to the statistical comparability between lab measurements and well logs, the main idea is to study and utilize inherent statistical features in naturally occurred carbonate rocks. Firstly, using the critical porosity model as rock physical theory, relationships are built between pore structures and elastic responses. Furthermore, in logging data scale, key parameters are estimated through a statistical method, and thus pore types are classified. The methodology is successfully applied in the well YS1. It is believed that this method will be a promising tool on handing pore complexity and inversion uncertainty in carbonate reservoir exploration. 展开更多
关键词 CARBONATE RESERVOIRS rock PHYSICS modeling critical POROSITY BAYESIAN estimation
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重庆綦江藻渡中二叠统沉积微相 预览
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作者 胡凯迪 陈洪德 +2 位作者 徐胜林 董翼昕 冯轲 《成都理工大学学报:自然科学版》 CAS CSCD 北大核心 2019年第3期334-341,共8页
探讨重庆綦江藻渡地区中二叠统沉积微相组合的特征及沉积环境演化。以野外地质剖面和室内薄片鉴定为基础,对藻渡地区中二叠统碳酸盐岩开展系统的岩石颗粒组分、岩石类型和沉积环境分析,并绘制相关图件。根据Dumham的碳酸盐岩沉积结构分... 探讨重庆綦江藻渡地区中二叠统沉积微相组合的特征及沉积环境演化。以野外地质剖面和室内薄片鉴定为基础,对藻渡地区中二叠统碳酸盐岩开展系统的岩石颗粒组分、岩石类型和沉积环境分析,并绘制相关图件。根据Dumham的碳酸盐岩沉积结构分类方案,主要有7种类型:生物碎屑颗粒灰岩、生物碎屑泥粒灰岩、泥灰岩、含生物碎屑泥粒灰岩、有孔虫泥粒灰岩、中-细晶白云岩和生物碎屑粒泥灰岩。研究区在中二叠世一直处于碳酸盐台地环境,发育了陆棚、台地边缘和开阔台地相,在栖霞组早期处于持续海侵过程,而栖霞组晚期经历了海退,到茅口组早期快速上升到最高点,茅口组中期开始下降,在茅口组晚期海平面大幅度快速下降到最低点。 展开更多
关键词 微相 沉积环境 碳酸盐岩 中二叠统 藻渡
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基于Hausdroff分形维数的碳酸盐岩酸蚀蚓孔计算模型 预览
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作者 齐丹 邹洪岚 +1 位作者 丁云宏 张合文 《科学技术与工程》 北大核心 2019年第6期105-109,共5页
在碳酸盐岩基质酸化过程中,一个主要特征是形成蚓孔。欧几里得空间认为蚓孔是无序的、杂乱无章的,采用经典数学的方法模拟难度极大。为了能够对酸蚓孔进行精确的定量分析、优化酸液用量及施工排量,以期获得最优酸化效果,需要建立蚓孔计... 在碳酸盐岩基质酸化过程中,一个主要特征是形成蚓孔。欧几里得空间认为蚓孔是无序的、杂乱无章的,采用经典数学的方法模拟难度极大。为了能够对酸蚓孔进行精确的定量分析、优化酸液用量及施工排量,以期获得最优酸化效果,需要建立蚓孔计算模型。以分形理论为基础,利用分数维描述蚓孔,引入'数盒子'计算法对蚓孔的Hausdroff分形维数进行研究,推导了碳酸盐岩基质酸蚀蚓孔有效作用距离的分形模型,用定量的方法描述不规则的酸蚀蚓孔等效长度。进行了影响参数敏感性分析及现场酸化实例计算,结果表明酸化后表皮系数与计算结果较为一致。对酸化优化设计具有较好的指导意义。 展开更多
关键词 碳酸盐岩 酸化 分形 Hausdroff维数 盒维数 蚓孔 溶蚀孔
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Leaf water potential and gas exchange of eucalypt clonal seedlings to leaf solar protectant 预览
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作者 Talita Miranda Teixeira Xavier Jose Eduardo Macedo Pezzopane +1 位作者 Ricardo Miguel Penchel Jose Ricardo Macedo Pezzopane 《林业研究:英文版》 CAS CSCD 2019年第1期57-64,共8页
This experiment was carried out in acclimatized greenhouses with seedlings of two hybrid clones of Eucalyptus urophylla×Eucalyptus grandis.A sunscreen protector consisting of 62.5%calcium carbonate was sprayed on... This experiment was carried out in acclimatized greenhouses with seedlings of two hybrid clones of Eucalyptus urophylla×Eucalyptus grandis.A sunscreen protector consisting of 62.5%calcium carbonate was sprayed on the seedlings at weekly intervals.Water stress was induced by suspending irrigation until the soil reached 30%available water and water was then replaced so that it returned to field capacity.Gas exchange and leaf water status were measured after 50 days.The experiment was set up in a 4×2 factorial randomized block design in four distinct environments:(1)temperatures less than 21.2℃and vapor pressure deficit of 0.15 kPa;(2)intermediate temperatures of 24.2℃and vapor pressure deficit of 0.69 kPa;(3)high temperatures of 27.0℃and high vapor pressure deficit of 1.4 kPa;and,(4)high temperature of 27.0℃and vapor pressure deficit below 1.10 kPa.Two leaf sun protector treatments were used,with five replications each.High atmospheric demand acted as a stress factor for the seedlings during the initial growth phase.Applications of leaf sunscreen protector provided beneficial effects in maintaining optimum water status and gas exchanges of the plants under water stress. 展开更多
关键词 EUCALYPTUS urophylla×Eucalyptus grandis Calcium CARBONATE Water stress ATMOSPHERIC DEMAND
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氮掺杂碳上单原子锌:CO2固定和转化的高效稳定催化剂 预览
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作者 Xinjiang Cui Xingchao Dai +5 位作者 Annette-Enrica Surkus Kathrin Junge Carsten Kreyenschulte Giovanni Agostini Nils Rockstroh Matthias Beller 《催化学报》 SCIE EI CAS CSCD 北大核心 2019年第11期1679-1685,共7页
环氧化合物与CO2环加成反应是环状碳酸酯合成和CO2利用的一种直接的原子经济方法,目前主要采用均相金属络合物催化此类转化反应.本文报道了一种新型多相Zn基催化剂,它可方便地通过热解活性炭负载的邻菲啰啉络合Zn(OAc)2而得到.详细的结... 环氧化合物与CO2环加成反应是环状碳酸酯合成和CO2利用的一种直接的原子经济方法,目前主要采用均相金属络合物催化此类转化反应.本文报道了一种新型多相Zn基催化剂,它可方便地通过热解活性炭负载的邻菲啰啉络合Zn(OAc)2而得到.详细的结构表征证实该材料中存在单原子Zn活性位.与Zn基纳米粒子催化剂相比,本文制备的单原子Zn催化剂在环氧化物环加成反应中表现出更高的活性和稳定性.采用该优化的催化剂成功地以高产率得到了一系列碳酸酯,该催化剂具有较好的基团容忍性. 展开更多
关键词 多相催化 单原子催化剂 二氧化碳 环加成 碳酸酯
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Thermodynamics of NaHCO3 decomposition during Na2CO3-based CO2 capture
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作者 Sam Toan William O’Dell +5 位作者 Christopher K.Russell Sun Zhao Qinghua Lai Huiping Song Ying Zhao Maohong Fan 《环境科学学报:英文版》 SCIE EI CAS CSCD 2019年第4期74-80,共7页
Amine-basedcarbon-capture technologies have been shown to be energetically expensive and to cause significant environmental and epidemiological impacts due to their volatility.Bicarbonate formation from carbon dioxide... Amine-basedcarbon-capture technologies have been shown to be energetically expensive and to cause significant environmental and epidemiological impacts due to their volatility.Bicarbonate formation from carbon dioxide’s reaction with water has been suggested as an effective alternative for capturing CO2;however,the thermodynamics of this reaction are not well understood.This study experimentally determined the equilibrium constant of sodium bicarbonate(Na HCO3)decomposition to sodium,water,and carbon dioxide;the study also compared the equilibrium constant to theoretical calculations.Using a combination of experimentation and thermodynamic relationships,the unitless equilibrium constants of the forward and reverse reactions were calculated accurately(error<±9%and<±4%,respectively).Equilibrium data were calculated using enthalpy and entropy values of each component of Na HCO3decomposition at temperatures ranging from 25 to 155°C respectively.These results offer more data essential to optimizing Na HCO3use in environmentally friendly nextgeneration CO2-capture technologies. 展开更多
关键词 SODIUM BICARBONATE SODIUM carbonate Gibbs free energy ENTHALPY Entropy
Hydrothermally induced diagenesis:Evidence from shallow marinedeltaic sediments,Wilhelmoya,Svalbard 预览
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作者 Beyene G.Haile Urszula Czarniecka +4 位作者 Kelai Xi Aleksandra Smyrak-Sikora Jens Jahren Alvar Braathen Helge Hellevang 《地学前缘:英文版》 CAS CSCD 2019年第2期629-649,共21页
Sedimentary basins containing igneous intrusions within sedimentary reservoir units represent an important risk in petroleum exploration.The Upper Triassic to Lower Jurassic sediments at Wilhelm?ya(Svalbard)contains r... Sedimentary basins containing igneous intrusions within sedimentary reservoir units represent an important risk in petroleum exploration.The Upper Triassic to Lower Jurassic sediments at Wilhelm?ya(Svalbard)contains reservoir heterogeneity as a result of sill emplacement and represent a unique case study to better understand the effect of magmatic intrusions on the general burial diagenesis of siliciclastic sediments.Sills develop contact metamorphic aureoles by conduction as presented in many earlier studies.However,there is significant impact of localized hydrothermal circulation systems affecting reservoir sediments at considerable distance from the sill intrusions.Dolerite sill intrusions in the studied area are of limited vertical extent(~12 m thick),but created localized hydrothermal convection cells affecting sediments at considerable distance(more than five times the thickness of the sill)from the intrusions.We present evidence that the sedimentary sequence can be divided into two units:(1)the bulk poorly lithified sediment with a maximum burial temperature much lower than 60-70℃,and(2)thinner intervals outside the contact zone that have experienced hydrothermal temperatures(around 140℃).The main diagenetic alteration associated with normal burial diagenesis is minor mechanical plastic deformation of ductile grains such as mica.Mineral grain contacts show no evidence of pressure dissolution and the vitrinite reflectance suggests a maximum temperature of~40℃.Contrary to this,part of the sediment,preferentially along calcite cemented flow baffles,show evidence of hydrothermal alteration.These hydrothermally altered sediment sections are characterized by recrystallized carbonate cemented intervals.Further,the hydrothermal solutions have resulted in localized sericitization(illitization)of feldspars,albitization of both K-feldspar and plagioclase and the formation of fibrous illite nucleated on kaolinite.These observations suggest hydrothermal alteration at T>120-140℃at distances considerably further 展开更多
关键词 DIAGENESIS SILL INTRUSIONS Hydrothermal convection cells Carbonate cement Sericitization of FELDSPARS
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