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Models of Spatial Structures of Regional Multi-element Geochemical Anomalies over Copper-Polymetallic Orefields

Acta Geologica Sinica(English Edition) 2003年第1期77卷 72-80页

作者： SHI Changyi and ZHANG Jinhua china University of Geosciences, beijing 100083 institute of Geophysical and Geochemical exploration, Langfang Hebei 065000 china Univ Geosci Beijing 100083 Peoples R China Inst Geophys & Geochem Explorat Langfang 065000 Hebei Peoples R China

Regional stream sediment surveys at a 1:200,000 scale reveal positive andnegative regional multi-element geochemical anomalies over medium to large copper-polymetallicorefields of different genetic types in china. Regional geochemical anomalies of orefield refer tothose geochemical anomalies that are related to metallogenesis of an orefield in a certain area. Theanomaly area is typically 10 to 100 km^2. The regional multi-element anomalies related tomineralization can be divided into three groups, that is, the ore-element anomaly association,indicator element anomaly association, and metallogenic environmental element anomaly *** common spatial distributions over ore deposits or orefields possess unique structures. Themodel of spatial structure of regional multi-element geochemical anomalies (RAGSS) of an orefielddelineates structural feature possessed by orderly spatial distributions of different groups ofmulti-element anomaly associations related to orefield metallogenesis. It is used to outline thecommon metallogenetic anomaly visage that is composed of the orderly spatial distribution ofdifferent groups of multi-element anomaly associations. The orderly spatial distribution ofmulti-element anomalies over an orefield reflects element distributions as they are changed from adispersed 'out-of-order' state into a concentrated 'orderly' state during the mineralization of anorefield. Three different patterns of the spatial anomaly structure related to mineralization in anorefield can be concluded: (1) nested pattern; (2) eccentric pattern and; (3) peripheral *** are marked differences between multi-element anomaly patterns related and not related tomineralization. RAGSS models of orefields can be used to better understand and evaluate regionalmulti-element anomalies and identify ore types.

关键词： orefield regional geochemical anomaly model anomaly structure RAGSSmodel

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Mn content of reservoir calcite cement: A novel inorganic geotracer of secondary petroleum migration in the tectonically complex Junggar Basin (NW china)

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Science china Earth Sciences 2007年第12期50卷 1796-1809页

作者： CAO Jian1,HU WenXuan1,YAO SuPing1,ZHANG YiJie2,WANG XuLong3,ZHANG YueQian3,TANG Yong3 & SHI XinPu3 1 State Key Laboratory for Mineral Deposit research,Department of Earth Sciences,Nanjing University,Nanjing 210093,china 2 research institute of exploration and Development,Petrochina,beijing 100083.china 3 research institute of exploration and Development,Petrochina Xinjiang Oilfield Company,Karamay 834000,china State Key Laboratory for Mineral Deposit research Department of Earth Sciences Nanjing University Nanjing China research institute of exploration and Development PetroChina Beijing China research institute of exploration and Development PetroChina Xinjiang Oilfield Company Karamay China

Electronic probe microanalysis(EPMA) results of reservoir calcite cement from fourteen core samples in the Junggar Basin show that Mn-content varies largely between different samples from below the detect limitation to 4.14%,while it displays a generally good correlation with oil-gas ***,therefore,likely indicates that concentration of the Mn-content of the calcite cement has a close rela-tion to the intensity of petroleum fluid charging during hydrocarbon secondary *** order to assess this hypothesis,oxygen and strontium isotopic measurements on sixteen calcite veins host in source sequences were carried out to investigate the feature of the oil-source petroleum *** results imply that during hydrocarbon generation and migration,deep hot fluid has dissolved volcanic minerals interlined between mudstone source *** Mn is a kind of typical trace element enriched in volcanic rocks,it is reasonable to conclude that the petroleum fluid formed in the source sequences would be ***,calcite cements precipitated from such Mn-rich petroleum fluid would be Mn-rich *** to the geologic chromatographic effect during migration along reservoir rocks,the decreasing of the Mn-content of the reservoir calcite cements indicates the migration ***,this novel geotracer was further successfully applied in the study of hydrocarbon migration in the Junggar Basin in combination with organic geochemical analyses during the hydrocarbon *** Mn content of the reservoir calcite cement appears promising as a novel inorganic geotracer for the petroleum *** paper represents a search for novel indicators of secondary petroleum migration in tectonically complex basins based on fundamentals of the reservoir fluid-rock interactions.

关键词： petroleum migration, inorganic geochemistry, water-rock interaction, reservoir calcite cement, the Junggar Basin

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Effect of stress sensitivity on displacement efficiency in CO_2 flooding for fractured low permeability reservoirs

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petroleum Science 2009年第3期6卷 277-283页

作者： Wang Rui Yue Xiang＇an Zhao Renbao Yan Pingxiang Dave Freeman Key Laboratory of petroleum Engineering Ministry of Education China University of Petroleum Beijing 102249 China sinopec exploration ＆ Production research institute Beijing 100083 China china Power Complete Equipment Co. Ltd. Beijing 100011 China Edwy R. Brown Department of petroleum Engineering Marietta College U.S.A.

Carbon dioxide flooding is an effective means of enhanced oil recovery for low permeability reservoirs. If fractures are present in the reservoir, CO2 may flow along the fractures, resulting in low gas displacement efficiency. Reservoir pore pressure will fluctuate to some extent during a CO2 flood, causing a change in effective confining pressure. The result is rock deformation and a reduction in permeability with the reduction in fracture permeability, causing increased flow resistance in the fracture space. Simultaneously, gas cross flowing along the fractures is partially restrained. In this work, the effect of stress changes on permeability was studied through a series of flow experiments. The change in the flowrate distribution in a matrix block and contained fracture with an increase in effective pressure were analyzed. The results lead to an implicit comparison which shows that permeability of fractured core decreases sharply with an increase in effective confining pressure. The fracture flowrate ratio declines and the matrix flowrate ratio increases. Fracture flow will partially divert to the matrix block with the increase in effective confining pressure, improving gas displacement efficiency.

关键词： Stress sensitivity flowrate distribution matrix fracture CO2 flooding displacement efficiency

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中国油气资源潜力及勘探战略

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石油学报 2004年第2期25卷 1-6页

作者：潘继平金之钧石油大学盆地与油藏研究中心北京102249 中石化勘探开发研究院北京100083

保障经济的持续高速发展给油气资源勘探开发提出了更高的要求。在石油供求矛盾日益突出的新形势下 ,加强油气勘探 ,实现资源战略接替 ,增储上产 ,增强国内油气资源对经济社会可持续发展的保障能力已迫在眉睫。近年勘探实践和资源评价表... 详细信息

保障经济的持续高速发展给油气资源勘探开发提出了更高的要求。在石油供求矛盾日益突出的新形势下 ,加强油气勘探 ,实现资源战略接替 ,增储上产 ,增强国内油气资源对经济社会可持续发展的保障能力已迫在眉睫。近年勘探实践和资源评价表明 ,我国沉积盆地发育 ,油气资源总量多 ,勘探潜力较大 ,但勘探难度加大。为此提出了“深化东部 ,加强西部 ,加快海上 ,开拓新区”

关键词：中国油气资源油气勘探资源潜力勘探战略

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Patterns of platinum-group elements in mantle peridotite, granulite xenoliths and basalt in Hannuoba

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Chinese Science Bulletin 1999年第18期44卷 1676-1681页

作者： CHU Xuelei, LI Xiaolin, XU Jiuhua and LIU Jianming1. The research Center of Mineral Resources exploration , Chinese Academy of Sciences , beijing 100101, china 2. institute of Geology , Chinese Academy of Sciences , beijing 100029, china 3. institute of High Energy Physics , Chinese Academy of Sciences , beijing 100817 , china 4. beijing University of Science and Engineering , beijing 100083, china Corresponding author The research Center of Mineral Resources exploration Chinese Academy of Sciences Beijing China institute of Geology Chinese Academy of Sciences Beijing China institute of High Energy Physics Chinese Academy of Sciences Beijing China beijing University of Science and Engineering Beijing China

Neutron activation analysis after preconcentration of nickel sulfide fire assay was used in measurement of Ru, Ph, Pd, Os, Ir, Pt (i.e. PGE elements) and Au concentrations for basalt, mantle and granulite xenoliths in Hannuoba. The chondrite- and primitive mantle-normalized PGE patterns generally exhibit flat (for Iherzolite), negative slope (for harzburgite),

关键词： mantle xenolith granulite xenolith basalt platinum-group element Hannuoba.

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An initial discussion on major controlling factors on formation of coal-formed large-medium sas fields

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Chinese Science Bulletin 2000年第5期45卷 394-404页

作者： DAI Jinxing, XIA Xinyu, HONG Feng, ZHAO Lin, SUN Dongmin & SHI Xinresearch institute of petroleum exploration and Development, beijing 100083, china Correspondence should be addressed to Dai Jinxing research institute of petroleum exploration and Development Beijing China

The so-called "large-medium gas field" means a gas field with proven reserves equal to or larger than 100×108 m3. Up to 1997, 23 coal-formed great-medium fields are discovered in china, excluding two in Taiwan Province. Their proven reserves take 50.9% in total natural gas reserves. Therefore, the coal-formed great-medium gas field plays a decisive role in natural gas reserves and the study of their controlling factors is very important both in theory and in practice. There are six major controlling factors on the formation of coal-formed large-medium gas fields: ( Ⅰ) The generating center of coal-formed gas and its surrounding area; (Ⅱ) low potential area; (Ⅲ) late pool-forming period; (Ⅳ) traps related to the paleo-uplifits in coal-formed gas area; (Ⅴ) above or between abnormally pressured compartments; (Ⅵ) faulted traps related to coal-bed.

关键词： coal-formed gas large-medium gas field controlling factor.

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Discovery of Early Proterozoic Carbon Isotope Shifts

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Acta Geologica Sinica(English Edition) 1995年第4期69卷 436-442页

作者： Zhong Hua institute of Geology, Chinese Academy of Sciences, beijingand Ma Yongsheng research institute of petroleum exploration and Development, beijing institute of Geology Chinese Academy of Sciences Beijing China

The authors have detailedly and systematically studied the carbon isotopic composition of Early Proterozoic carbonate rocks. Samples which are all dolomicrite were taken from the Jianancun, Daguandong and Huaiyincun Formations of the Hutuo Group in Wutai County Shanxi Province, North china. A total of 209 samples were analysed for their carbon isotope compositions, and the mean sampling interval was 6.9 m. Carbon isotope analysis clearly shows δ13. shifts at the boundary between the Jian'ancun Formation and Daguandong Formation and near the boundary between the Daguandong Formation and Huaiyincun Formation. Like carbon isotope shifts at the Cretaceous-Tertiary, Permian-Triassic and Precambrian-Cambrian boundaries, the discovery of δ13. shifts in the Early Proterozoic has important significance in further studies on Early Proterozoic biotic evolution, regional and global stratigraphic correlation, and carbon geochemical cycles.

关键词： carbon isotope shift Early Proterozoic carbonate strata

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A physical model study of effect of fracture aperture on seismic wave

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Science china Earth Sciences 2008年第S2期51卷 233-240页

作者： WEI JianXin & DI BangRang CNPC Key Physical exploration Laboratory,china University of petroleum,beijing 102248,china CNPC Key Physical exploration Laboratory China University of Petroleum Beijing China

Based on Hudson’s theoretical hypothesis of equivalent fracture model,inserting aligned round chips in solid model can simulate fractured media. The effect of fractures on the propagation of P and S waves can be observed by changing the fracture thickness. The base model is made of epoxy resin,and the material of fractures is a kind of low-velocity mixture containing silicon rubber. With constant diameter and number of fractures in each model,one group of models can be formed through changing the thickness of fracture. These models have the same fracture density. By using the ultrasonic pulse transmission method,the experiment records time and waveform of P and S waves in the direction parallel and perpendicular to the fracture orientation. The result shows that,with the same fracture density,changing fracture aperture will affect both velocity and amplitude of P and S waves,and the effect on P-wave amplitude is much greater than that on the velocity. Moreover,the variation in velocity of S wave is more obvious in the slow shear wave (S2),while the variation in amplitude is more obvious in the fast shear wave (S1). These properties of wave propagation are useful for seismic data processing and interpretation.

关键词： fracture aperture Hudson’s fracture theory fractured model P-and S-wave velocity amplitude

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Gas formation mechanism of marine carbonate source rocks in china

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Science china Earth Sciences 2005年第4期48卷 441-453页

作者： ZHAO Wenzhi1, WANG Zhaoyun1, HE Haiqing2, ZHANG Mingjie3, WANG Hongjun1, WANG Yunpeng4 & QIN Yong5 1. research institute of petroleum exploration & Development, Petrochina, beijing 100083, china 2. Petrochina exploration & Production, beijing 100011, china 3. Department of Geology, Lanzhou University, Lanzhou 730000, china 4. Guangzhou Geochemical institute, Chinese Academy of Sciences, Guangzhou 510640, china 5. china University of Mining and Technology, Xuzhou 221000, china research institute of petroleum exploration & Development PetroChinaBeijin China Petrochina exploration & Production Beijing China Department of Geology Lanzhou University Lanzhou China Guangzhou Geochemical institute Chinese Academy of Sciences Guangzhou China china University of Mining and Technology Xuzhou China

By breaking through the conventional ideology on the study of gas-formation mechanism of source rocks which focused on merely the characteristics of source rocks them- selves, and based on the development and distribution characteristics of marine carbonate source rocks in the medium-to-bottom parts of the Chinese superimposed sedimentary basins as well as various processes in the course of gas generation and reservoir forming, the complex hydrocarbon-generating model of carbonates is established. Such a model concerns not only the “three-stage” gas formation characteristics of carbonates, but also the gas generation process due to a thermal cracking of oil and the re-generation process of gas from heated secondary organic matters during the gas-generation and reservoir-forming course. The high-quality hy- drocarbon generating matter of marine carbonate source rocks determined a high gas-oil ratio and tended to form paleo-oil-reservoirs, representing an enrichment process of organic matters. The thermal cracking of oil in palaeo-oil-reservoirs is an important means for the effective forma- tion of gas reservoirs. The secondary organic matters in carbonate reservoirs may regenerate gas after a secondary deep burial, thus becoming an effective gas source.

关键词： carbonate, three-stage hydrocarbon generation, inhibitive effect of maturity, oil-cracking gas, second-ary asphalt gas.

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Study on Filtration Performance of Silica/ Alumina Slurry in the Process of Recycling Mother Liquor of NaY Zeolite

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china petroleum Processing & Petrochemical Technology 2004年第1期6卷 49-54页

作者： Guo Yaoqing Ma Yuelong Deng Jinghui(research institute of petroleum Processing, beijing 100083) Res. Inst. of petroleum Processing Beijing 100083 China

In order to recover the SiO_2 contained in the mother liquor in the course ofNaY zeolite synthesis to minimize pollution, the influence of various preparation conditions on thefiltering velocity of gel slurry was studied using the SiO_2/Al_2O_3 gel recovered from the NaYmother liquor in the laboratory. The results of study had shown that at a SiO_2/Al_2O_3 ratio in thefeed equating to 9∶1 the SiO_2 recovery rate and Al_2O_3 utilization rate were high with a fasterflow velocity of the filtrate. The pH value of the system had great impact on the flow velocity offiltrate. Between the two methods for regulating the pH value, the one for formation ofsilica/alumina gel slurry by addition of sulfuric acid prior to adding aluminium sulfate in thesolution could secure a faster filtration velocity. The filtration velocity was decreased in tandemwith increasing SiO_2 concentration in mother liquor, meanwhile an increase in dry filter cakeyield.

关键词： NaY zeolite mother liquor filtration performance Si/Al ratio gel wasteutilization laboratory scale

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