bluuebunny/crossref_metadata_2025_split huggingface dataset:
LA HOLMQUISTITE DES PEGMATITES DE VOLTA GRANDE PRES DE SÃO JOÃO DEL REI, MINAS GERAIS, BRESIL: CARACTERISTIQUES CHIMIQUES ET MINERALOGIQUES
Authors: Quéméneur J. , Lagache M. 
Published: January 2016

Os pegmatitos transamazônicos de Volta Grande ocorrem na região de São João del Rei, Minas Gerais,onde eles estão encaixados em anfibolitos do greenstone belt arqueano do vale do Rio das Mortes. Estespegmatitos, muito ricos em lítio, desenvolvem uma auréola de metamorfismo de contato caracterizada pelaformação de holmquistita e de Mg-zinnwaldita. A holmquistita aparece na forma de cristais fibrosos de corvioleta. A sua composição química foi determinada por microssonda eletrônica e química clássica, elacorresponde à fórmula (Li,Na)2 (Mg,Fe)3 (AlVI,Fe)2 (Si,AlIV)8 O22(OH,F), muito parecida com a fórmula proposta por London & Burt (1982).A holmquistita de Volta Grande é caracterizada por seu alto teor em Fe e o alto valor da relação Fe/Mgsendo assim parecida como a de Edison no Dakota do Sul (Walker et al. 1989). Geneticamente a holmquistitaparece ter sido formada por substituição, às expensas da hornblenda, por ação de soluções oriundas dospegmatitos. Pode-se notar a boa correlação entre as relações Fe/Mg das holmquistitas e das hornblendasencaixantes tanto em Volta Grande como em Edison. A presença simultânea de holmquistita e Mg-zinnwalditasugere que as soluções eram ricas em Li, K, Rb e H2O.Os parâmetros de malha calculados sobre 25 picos estão em conformidade com os dados mais recentestais como os de Greenbushes na Autralia (Frost et al. 1987). ABSTRACT: The Volta Grande pegmatites occur near the town of São João del Rei in the south of Minas Geraisstate. They are associated with Early Proterozoic (Transamazonian) granites. These granites and pegmatitesare hosted by gneisses and amphibolites of the Archean greenstone belt of the Rio das Mortes Valley. Thepegmatites, very rich in Li, develop a large metamorphic aureole in the amphibolites with holmquistiteand zinnwaldite.The holmquistite forms acicular or fibrous, purple coloured crystals. Individual crystals were analysedby electron-microprobe and wet chemistry. The structural formula (Li,Na)2 (Mg,Fe)3 (AlVI,Fe)2 (Si,AlIV)8O22(OH,F), is very similar to that proposed by London & Burt (1982). The Volta Grande holmquistite ischaracterized by a particularly high Fe/Mg ratio. A good correlation of Fe/Mg ratios of the holmquistiteand of the hornblende is observed in Volta Grande and Edison (Walker et al. 1989). We suggest that theholmquistite thas been formed by substitution of the hornblende of the wall-rock, caused by a Li-rich solution.The unit cell parameters calculated with 25 peaks are comparable to those of Barraute (Nickel et al.1960) and Greenbushes (Frost et al. 1987).
QUÍMICA MINERAL E IDADES U-Pb DE MONAZITAS DE PLACERS MARINHOSDA REGIÃO NORTE FLUMINENSE
Authors: Oliveira Elizabeth Kerpe , Bühn Bernhard , Correia Neves José Marques , Chaves Alexandre de Oliveira , Chaves Mário Luiz de Sá Carneiro 
Published: January 2016

Este trabalho abrange o estudo de química mineral e geocronologia U-Pb de grãos de monazita, composicionalmentehomogêneos, provenientes de várias jazidas explotadas pelas Indústrias Nucleares do Brasil (INB) em placers marinhos da região de Buena,litoral norte fluminense. A área está localizada na região da Bacia de Campos e, geologicamente, pertence à Província TectônicaMantiqueira, que representa um sistema orogênico neoproterozóico desenvolvido na borda sudeste do Cráton São Francisco. As idades UPbobtidas por LA-ICP-MS abrangem um intervalo entre 486 Ma e 579 Ma, sendo que as idades mais jovens são de grãos de monazitas ricosem cério. Por outro lado, as idades mais antigas correspondem a grãos de monazitas com tendência à composição cheralítica, nos quaisocorre um enriquecimento principalmente em CaO e ThO2. A comparação dessas idades com informações geológicas regionais permiteinferir as suítes G2 (granitos granada-biotita gnaisse foliado) e G3 (leucogranitos, não deformados, encaixados em G2) como rochas-fonteda população de monazita mais antiga, suítes estas relacionadas com o arco sin-colisional desenvolvido simultaneamente aometamorfismo e à deformação regional Neoproterozóica. Já a população de monazita mais jovem pode ser proveniente de corposgraníticos das suítes G4 (plútons magmáticos zonados) e G5 (ballons magmáticos), representantes das fases pós-colisionais.Palavras-chave: Monazita, quimica mineral, idades U-Pb, LA-ICP-MS. ABSTRACTMINERAL CHEMISTRY AND U-Pb AGES OF MONAZITE FROM MARINE PLACERS OF THE NORTHERN RIO DE JANEIRO STATE - Thisresearch focusses on mineral chemistry and U-Pb geochronology of monazite grains of homogeneous composition, originating from severalmarine-placer deposits exploited by Indústrias Nucleares do Brasil (INB), in Buena, northern Rio de Janeiro State. Buena is located close tothe Campos Basin and related to the geological context of the Mantiqueira Tectonic Province, which represents a neoproterozoic orogenicsystem developed in the southern edge of the São Francisco Craton. Uranium-Pb ages by LA-ICP-MS fall between 486 Ma and 579 Ma.Younger ages are related to Ce-rich monazite. Older ages correspond to monazite with cheralitic signature, chiefly enriched in CaO andThO2. These ages are interpreted in the geological context of the Mantiqueira Tectonic Province as rock sources for older monazites, whichare correlated to syn-collisional arc simultaneously developed together the neoproterozoic regional metamorphism and deformation. Theyounger monazites came from granitic plutons of G4 and G5 suites, related to post-collisional phases.Keywords: Monazite, mineral chemistry, U-Pb ages, LA-ICP-MS.
BIOGEOQUÍMICA DA MATÉRIA ORGÂNICA E METAIS EM UM MANGUEZAL NA ZONA ESTUARINA URBANA, BAHIA, BRASIL
Authors: Andrade Consuelo Lima Navarro de , Celino Joil José , Barbosa Ronaldo Montenegro , Garcia Karina Santos , Escobar Narayana Flora Costa 
Published: January 2016

O comportamento biogeoquímico do carbono, nitrogênio, fósforo e metais, e os isótopos traçadores naturais da matéria orgânicaforam estudados nos sedimentos e plantas em 15 pontos no estuário do rio Passa Vaca, situado em área urbana de Salvador, Bahia, Brasil.Nos sedimentos, a ordem dos elementos investigados foi: Fe > Al > Ca > P > Na >Cu >K > Zn > Mn, para a espécie Laguncularia racemosa (L.)Gaertn observou-se: Na > Ca > K > Fe > Mn > Al > Zn > Cu; e para Rhizophora mangle L: Na > Ca > K > Mn > Fe > Al > Zn > Cu além decorrelações sedimento/planta na concentração dos elementos. Entretanto, os fatores de concentração para os metais pesados estiveramabaixo de 1 indicando baixa absorção destes pelas plantas. O Carbono Orgânico Total (COT) variou de 1,03 a 4,77%. A razão molar C/N eisotópicas 13C e 15C indicaram que um percentual considerável da matéria orgânica é de fonte terrestre, sendo proveniente da vegetaçãodo próprio manguezal.Palavras-chave: Metais, matéria orgânica, isótopos. ABSTRACTBIOGEOCHEMISTRY OF ORGANIC MATTER AND METALS IN A MANGROVE AT THE URBAN ESTUARINE AREA, BAHIA, BRAZIL -The biogeochemical behavior of carbon, nitrogen, phosphorus, metals and natural tracer isotopes of organic matter were studied insediments and plants at 15 points in the estuary of the Passa Vaca River, located in urban area of Salvador, Bahia, Brazil. Sedimentelements were the order: Fe> Al> Ca> P> Na> Cu> K> Zn> Mn, for the specie Laguncularia racemosa (L.) Gaertn was observed: Na> Ca> K>Fe> Mn> Al> Zn> Cu, and Rhizophora mangle L: Na> Ca> K> Mn> Fe> Al> Zn> Cu. Correlations were also observed sediment/plant in theconcentration of elements evaluated. However, the concentration factors for heavy metals were below 1 indicating low absorption ofthese plants. The Total Organic Carbon (TOC) ranged from 1.03 to 4.77%. The molar ratio C / N and isotopic 13C and 15C indicated that asignificant percentage of organic matter is land-based sources, and from the mangrove vegetation itself.Keywords: Metals, organic matter, isotopes.
GRANULITE FACIES ROCKS FROM GUAXUPÉ, MG: GNEISS-FLUID SEQUENCES AND P-T CONDITIONS
Authors: Choudhuri Asit , Silva Dailto , Nogueira José Renato , Sabó Gergely 
Published: January 2016

Gnaisses de fácies granulito nos arredores de Guaxupé formaram-se em condições de P-T estimadas em 8-9 Kb/800-900°C, e depois sofreram descompressão P-T-t em virtude dosoerguimento. O limite inferior deste caminho é estimado em 5-6 Kb/600-700°C. Estudos de inclusões fluidas mostram fluidos de CO2, N2 E H2O dentro dos vários tipos de rochas pertencentes a esta sequência gnáissica, que resultaram da evolução da região. As isócoras para o CO2 estão compatíveis com a estimativa do limite inferior de P-T, dentro do fácies anfibolito. Entretanto, nenhum pico de fase rica em CO2, dos fluidos metamórficos foi detectado, podendo ser que o metamorfismo aconteceu sob as condições de ausência de fluido. Efeitos de alteração incipiente induzidos por fluidos na paragênese de fácies granulitos sugerem que o fluido pode não ter sido pervasivo, como pé comumente assumido para os terrenos de fácies granulito.
OURO BRANCO/AÇOMINAS: UM ÚLTIMO CAPÍTULO DA HISTÓRIA DA PRODUÇÃO DO ESPAÇO PARA A INDÚSTRIA?
Authors: Costa Heloisa S. M. , Costa Geraldo M. 
Published: January 2016

The paper explores the close relationship between urbanization and industrialization in Minas Gerais throughthe case study of Açominas, a large scale steel mill built in the seventies and privatized in the eighties, andOuro Branco, a city planned and built as its urban support. The plan of the city is first discussed in the lightof national expectations concerning the expansion of that industrial branch at the time, and then comparedto other previous experiences of production of space as a result of industrial needs in other areas of MinasGerais. At the same time, some important implications are emphasized, as far as governance and the qualityof the urban space are concerned.Considering as a background the privatization of industry and a general restructuring of industrial production and goals, the paper explores some recent perspectives facing the future of both industry and the city. Someof the alternatives considered by the local leaders and administration include the diversification of activitiesand ecological tourism. It also argues that in a scenery of fierceful competition and constant change, theattributes of the planned urban space, despite its excludent character in social and spatial terms, are an assetthat differentiates Ouro Branco from other cities in similar position. Trabalho apresentado no VI Encontro Nacional da ANPUR, Recife, maio de 1997
Study of an Oil Soluble Diverting Agent for Hydraulic Fracturing Treatment in Tight Oil and Gas Reservoirs
Authors: Zhao Xianzheng , Li Yongjun , Cai Bo , Hua Shen , Shi Yuanpeng , He Chunming , Li Shuai , Zhao Anjun 
Published: January 2016

Abstract
Nowadays, the fiber has become the most important oilfield chemical material with great advantages in hydraulic fracturing treatment when considering fluid leak off, proppant transportation and fracture damage in tight oil and gas reservoirs. However, it still has some drawbacks, such as mechanical properties, heat denaturation and poor chemical stability, always emerge in oilfield cases. Accordingly, a new type of oil soluble temporary diverting agent is used to overcome these shortcomings in our research. We developed into a new agent with different types of petroleum resin and hydrocarbon resin. A series of evaluation experiment was carried out including temperature compatibility, diverting efficiency and dispersity etc. The results showed that with increasing temperature and prolonging dissolved time, the oil soluble rate of temporary agent in 6 hrs was 95%-99% at 80-120 °C, which indicated good oil solubility. After complete dissolution, the viscosity of 5-20 g/L solution was 12.6-53.7 mPa.s, which had good flowback after treatment. Furthermore, by reducing the diverting particle size and improving the level of aggregation of particles, a specially designed instrument was put forward to evaluate the performances of fracture conductivity, fracture diverting. The length and concentration of the agent were optimized in this study.
More than 20 treatments with new agents in Huabei oil field have been performed with encouraging results, 95.2% efficiency with an average post-fracturing rate reach to 21.3m3/d, which was three times of before stimulation. The results have great influences on both theoretical study and field treatments of new chemical material for impoving complex fracure degree of hydraulic fracturing in tight oil and gas reservoirs.
Incorporating New Knowledge Significantly Improves Outcomes for Nascent Shale Gas Drilling in Cooper Basin
Authors: Yim M. , Ross A. I. , Healey S. , Leedham R. , Giuliano M. 
Published: January 2016

Abstract
This paper describes the procedures and methods used to successfully drill an extended reach horizontal well in Permian Shale Source Rock Reservoir, in the Cooper Basin, South Australia.
A previous attempt at a similar well design did not reach the objective. An independent review of this well's performance was used as a starting point to design an improved drilling program for the second well.
This included the following:
Closer liaison and collaboration was encouraged between the operator and the service providers. Improvements were planned for the second well to eliminate or reduce the severity of hole problems that occurred in the previous well. Written procedures were established to ensure that hole quality was maintained throughout the drilling phase. Technologies that could assist in improving drilling performance were identified, evaluated, and used.
As a result of these initiatives, the second well was considerably more successful than the 1st.
To compare and contrast the results of both wells as an indicator of improvement:
– The 1st well achieved only 37% of the objective. The 2nd well achieved 170% of the objective. – The 1st well exposed 589m of lateral wellbore. The 2nd well exposed 1014m of lateral wellbore – The 1st well required 38 days of drilling. The 2nd well was drilled in 11, despite being twice as long – The lateral in 1st well required 7 bits. The lateral in the 2nd well was drilled with 1 bit, again despite being twice as long – The 1st well observed 485 hours of NPT. The 2nd well was drilled with ZERO NPT.
The technologies and improved procedures used in the second well facilitated its success and these initiatives will be refined for future similar wells. The major contributors to difference between these two wells are:
Improved drilling fluid including the use of mud lubricant The use of drillstring torque-reducing subs improved bottomhole assembly (BHA) performance and reduced wear on downhole equipment. A new bit designed to match the rotary steerable system (RSS) tool and formation drilled the entire extended lateral and could have achieved even more.
Enhanced Sand Control of Multiple Branches Connected to a Single Wellbore
Authors: Durst Doug G. 
Published: January 2016

Abstract
Drilling, completing, and the production monitoring and control of multilateral wellbores in highly unconsolidated sandstone formations have achieved technical and operational success in recent past by ensuring that economic viability is attained and that well life is prolonged.
Gravel packing the lateral branch on a multilateral well is no longer a challenge. Sound isolation of the main branch is achieved to preserve the mainbore of debris when milling the window and drilling the lateral, which will ensure seamless gravel-pack operations. Stable junction isolation exists to support sand placement and the subsequent reverse-out of gravel-pack operations in both the main and lateral branch. Additionally, it is no longer considered a risk to run long, stiff, bottomhole completion assemblies across the window junction. One of the key factors in determining if a multilateral wellbore might be suitable for a given project is the type of sand-control completion and technique that might be required. The use of conventional standalone screens has a long and highly successful history. And now, where more sand-control reliability is required via use of gravel packs in combination with multilateral wellbores, technology is available and is also beginning to develop its own successful history.
Multiple successful installations of dual-bore, horizontal gravel-pack completions combined with Level-5 multilateral completion systems has resulted in increased reservoir drainage to improve the oil-recovery factor as well as the economic gains. In its current, form when combining advanced sandface completions with multilateral completions, the gravel-pack operations are followed by the installation of multilateral and upper completions. As a result of a newly developed system, one can now interconnect the junction completion with the sand-control operations in a single, seamless operation.
Advanced Geosteering Technology Promotes the Accuracy of Well Placement in the Thin Reservoirs of China Mature Oilfield
Authors: Hongsheng LI , Guofeng XIA , Daicai XU , Xuekai LI , Calleja-Djefel Bronwyn , Youquan LIU 
Published: January 2016

Abstract
After more than a decade of producing oil from the thick marine sand reservoirs in the HaDeXun oil field in the Tarim basin of western China, focus has shifted to the challenges of drilling thinly laminated reservoirs. To maximize efficiency and production, geosteering services, as well as bottomhole assembly (BHA) and bit optimization, were used for the successful drilling of two thin sands, which resulted in reservoir contact of 100 and 96%, respectively.
This paper presents a case study discussing prewell modeling, the planning process, execution, and results of drilling two complex thinly laminated reservoirs in a single well within a mature field. Each less than a meter thick, the thin reservoir targets are located above the main DongHeSha (DHS) sand reservoir and are bound by shale with uncertain formation dips. Adding to the complexity, the thin sands have limited lateral extension; however, recent improvements to well-placement technology have enabled these reserves to be recovered, which was almost impossible with previous conventional directional drilling methods.
An advanced well-placement process is discussed in the paper using azimuthal at-bit-gamma images and inclination measurements positioned only 1 m from the bit, a point-the-bit rotary steerable system, and modeling software for rapid, accurate data interpretation and pre-emptive wellbore positioning. Collaboration across teams resulted in an optimized BHA, which enabled directional changes to be made during the landing process to accommodate geosteering interpretations that refined the geological model to reduce uncertainties associated with the location of the reservoir top and bounding formation dips. Once landed, the well was successfully steered within the two thin sands, delivering one 303-m lateral section with 100% exposure to the reservoir and a second 300-m lateral section with 96% sand exposure.
This paper presents a practical workflow encompassing the integration of all available data, including seismic, offset-well petrophysical logs, mud logging, and real-time logging-while-drilling (LWD) images to overcome dip uncertainty and maintain the wellbore within the thinly laminated target sands. Also presented is a customized design of the BHA and drill bit, which were necessary during the landing portion of the drilling program and, when used together, helped reduce vibration, increase the rate of penetration (ROP), and enhance dogleg building capability to maximize reservoir exposure in a safe and efficient manner.
Why Multilateral Cemented Junction Wells Can Help Economics for Development Projects in Oil and Gas Shale Reserves
Authors: Vento Mario , Durst Doug 
Published: January 2016

Abstract
Multilateral wells have been routinely drilled for several applications, with shale plays representing a natural progression for its use. Augmenting a multilateral well with selective fracturing of each leg is as straightforward as fracturing a single horizontal well. Multilateral wells with cemented junctions provide a good alternative to improve the economics for the development of oil and gas shale-reserve projects. This paper provides a description of the primary reasons for improving development project economics.
Multilateral solutions provide the means to work within a limited surface access area and generate a reduced footprint while draining a much larger volume of the reservoir from a single-surface location. This solution presents a significant advantage when drilling in sensitive or restricted locations, populated areas, and areas in which land issues restrict access to multiple drilling locations. In addition, the cost and effects of large drilling pads or multiple wellsites are avoided.
This paper describes the results obtained from the implementation and execution of projects in which cemented junctions were created for a new dual-lateral well and for an existing well in North America. It also provides the average cost savings obtained when this approach is compared to that of a single main wellbore and describes well performance with commingled production rates above typical single horizontal wells.
Based on past experience, the use of multilateral wells with cemented junctions (applied for new and/or existing wells) can make significant contributions toward helping oil and gas shale-reserve projects to be economically feasible, whereas the economics of single horizontal wells do not offer advantages for a large development plan for oil-and-gas-industry operators.
High Build Up Rate Rotary Steerable System Leads to Revolutionize Onshore Horizontal Drilling in Western Desert of Egypt
Authors: Khattab H. M. , Ismail A. I. , Abdalla M. E. , Deraz S. , Helmy A. , Okasha M. , Samad H. A. , Ibrahim A. , Mansour M. , Muir D. , Vasicek A. G. 
Published: January 2016

Abstract
The drilling in the Western Desert area of Egypt is experiencing a shift from vertical to horizontal drilling.
Challenging geology, critical landing zones, complex well profiles, and tight lease boundaries lead to the requirement of High Build Up Rate (HBUR) values. This creates a drilling challenge with the limited capabilities of the current, commercial Rotary Steerable Systems (RSS).
The maximum Dogleg Severity (DLS) output capability for a RSS drilling 8–1/2 in hole size from most major directional drilling service providers is about 6.5° /100 ft. In soft formations, these doglegs output drop significantly and the RSS is replaced by a mud motor assembly. To overcome these challenges, the operator and directional drilling service provider teamed up to strengthen performance and consistency utilizing a new HBUR RSS technology coupled with an optimized bit design.
The operator and directional drilling service provider started a drilling campaign in 2013. The plan was to drill a HBUR curve in 8–1/2 in hole and land in the target zone with planned (DLS) in the range of 8.00 to 10.00° /100 ft. Then set a liner and drill 6 in lateral hole to the well TD. To date, this campaign has resulted in the successful drilling of three wells. The operator's costs were lowered through improved performance with the new HBUR RSS technology. The new technology reduced the number of trips and enabled faster curve drilling with pure rotary and better toolface control. The average number of drilling days per curve and lateral were reduced. In all cases, the curve HBUR planned rates were successfully achieved in a single run with optimum rate of penetration. This paper will discuss the case histories of the three successful wells. The benefits, cost savings and performance improvements of the HBUR RSS technology will be described for each well.