scholarly journals Microstructure Investigation of Oil-Bearing Rhyolites: A Case Study from the Hailar Basin, NE China

Minerals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 699
Author(s):  
Anqi Mao ◽  
Han Zheng ◽  
Xiaomeng Sun
Keyword(s):  
Hydrocarbon Reservoirs ◽  
Hydrocarbon Exploration ◽  
Porous Rocks ◽  
Ne China ◽  
Fluorescence Image ◽  
Crystal Dissolution ◽  
Rhyolitic Lava ◽  
Hailar Basin ◽  
Quantitative Analyses

Understanding the microstructure of rhyolites may greatly promote exploration efforts on rhyolitic hydrocarbon reservoirs; however, related studies are sparse. In this contribution, the microstructure and related porosity of oil-bearing rhyolitic lavas from the Hailar Basin (NE China) were investigated using a combination of optical microscopy, fluorescence image analysis, and scanning electron microscopy. The direct visual and quantitative analyses show that the rhyolites are heterogeneous and porous rocks and have complex microstructures. Phenocryst-rich rhyolitic lava, perlitic lava, and spherulitic rhyolite may be favorable targets for rhyolitic hydrocarbon exploration. For the phenocryst-rich rhyolitic lavas, embayment pores, cleavages, cavitational and shear fractures, and intracrystalline sieve pores are commonly observed in the phenocrysts; while flow-parallel laminar and micropores are ubiquitous in the groundmass. Perlitic lavas are characterized by the occurrence of numerous perlitic fractures which can also be produced in the glassy groundmass of other lavas. Spherulitic rhyolites mainly consist of small-sized (<1 mm) clustered or large-sized (>1 mm) isolated spherulites. Clustered spherulites are characterized by the development of interspherulite pores. Isolated spherulites contain numerous radiating micropores. Both types of spherulites may have water expulsion pores formed in the spherulite–glass border. The formation of the microstructure and related porosity of rhyolites is controlled by pre-, syn- (e.g., deuteric crystal dissolution, cavitation, ductile–brittle deformation, and high-T devitrification), and post-volcanic (e.g., hydration and low-T devitrification) processes. Although pores with diameters > 50 μm are often observed, small pores dominate in pore-size distribution. Small (<15 μm) and large (>300 μm) pores give the most volumetric contribution in most cases. Medium-sized pores with diameters ranging from ~150–300 μm are the least developed and contribute the least to the total volume. The results of this paper can be beneficial to further the understanding of the microstructure and pore system of rhyolites and may be applied to rhyolitic lava hydrocarbon reservoirs elsewhere.

Devitrification pores and their contribution to volcanic reservoirs: A case study in the Hailar Basin, NE China

2018 ◽  
Vol 98 ◽  
pp. 718-732 ◽  
Author(s):  
Han Zheng ◽  
Xiaomeng Sun ◽  
Jiping Wang ◽  
Defeng Zhu ◽  
Xuqing Zhang
Keyword(s):  
Ne China ◽  
Hailar Basin ◽  
Volcanic Reservoirs

2018 Fiji Election Results: Patterns of Voting by Provinces, Rural-Urban Localities, and by Candidates

2020 ◽  
Vol 40 (2) ◽  
Author(s):  
Haruo Nakagawa
Keyword(s):  
Political Parties ◽  
Electoral System ◽  
Interesting Case ◽  
The Political ◽  
Quantitative Analyses ◽  
Election Results

Akin to the previous, 2014 event, with no data on voter ethnicity, no exit polls, and few post-election analyses, the 2018 Fiji election results remain something of a mystery despite the fact that there had been a significant swing in voting in favour of Opposition political parties. There have been several studies about the election results, but most of them have been done without much quantitative analyses. This study examines voting patterns of Fiji’s 2018 election by provinces, and rural-urban localities, as well as by candidates, and also compares the 2018 and 2014 elections by spending a substantial time classifying officially released data by polling stations and individual candidates. Some of the data are then further aggregated according to the political parties to which those candidates belonged. The current electoral system in Fiji is a version of a proportional system, but its use is rare and this study will provide an interesting case study of the Open List Proportional System. At the end of the analyses, this study considers possible reasons for the swing in favour of the Opposition.

Volcanic lithology identification based on parameter-optimized GBDT algorithm: A case study in the Jilin Oilfield, Songliao Basin, NE China

2021 ◽  
pp. 104443
Author(s):  
Zhichao Yu ◽  
Zhizhang Wang ◽  
Fancheng Zeng ◽  
Peng Song ◽  
Bestman Adjei Baffour ◽  
...  
Keyword(s):  
Songliao Basin ◽  
Ne China ◽  
Lithology Identification

Collaborative idea exchange and material tinkering influence families’ creative engineering practices and products during engineering programs in informal learning environments

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Soo Hyeon Kim ◽  
Heather Toomey Zimmerman
Keyword(s):  
Design Research ◽  
Naturalistic Inquiry ◽  
Content Type ◽  
Engineering Programs ◽  
Solution Generation ◽  
Quantitative Analyses ◽  
Feasible Solutions ◽  
Engineering Practices ◽  
Parent Child

Purpose This paper aims to investigate how families’ sociomaterial experiences in engineering programs held in libraries and a museum influence their creative engineering practices and the creativity expressed in their products derived from their inquiry-driven engineering activities. Design/methodology/approach This research project takes a naturalistic inquiry using qualitative and quantitative analyses based on video records from activities of 31 parent–child pairs and on creativity assessment of products that used littleBits as prototyping tools. Findings Families engaged in two sociomaterial experiences related to engineering – collaborative idea exchange and ongoing generative tinkering with materials – which supported the emergence of novel ideas and feasible solutions during the informal engineering programs. Families in the high novelty score group experienced multiple instances of collaborative idea exchange and ongoing generative tinkering with materials, co-constructed through parent-child collaboration, that were expansive toward further idea and solution generation. Families in the low novelty score group experienced brief collaborative idea exchange and material tinkering with specific idea suggestions and high involvement from the parent. An in-depth case study of one family further illustrated that equal engagement by the parent and child as they tinkered with the technology supported families’ creative engineering practices. Originality/value This analysis adds to the information sciences and learning sciences literatures with an account that integrates methodologies from sociocultural and engineering design research to understand the relationship between families’ engagement in creative engineering practices and their products. Implications for practitioners include suggestions for designing spaces to support families’ collaborative idea exchange and ongoing generative tinkering to facilitate the development of creative engineering practices during short-term engineering programs.

The Limits of Observation for Understanding Mass Violence

2015 ◽  
Vol 30 (02) ◽  
pp. 237-257 ◽  
Author(s):  
Megan Price ◽  
Patrick Ball
Keyword(s):  
Empirical Evidence ◽  
Statistical Methods ◽  
Transitional Justice ◽  
Historical Memory ◽  
Legal Responsibility ◽  
Mass Violence ◽  
Different Types ◽  
Observable Data ◽  
Quantitative Analyses

Abstract Quantitative analyses have the potential to contribute to transitional justice mechanisms, via empirical evidence supporting the memory of victims, allocating proportional responsibility among perpetrators, determining legal responsibility, and supporting historical memory and clarity. However, most data available in transitional justice settings are incomplete. Conducting quantitative analyses relying solely on what is observable and knowable leads to not only incomplete but often incorrect analytical results. This can harm rather than contribute to transitional justice mechanisms. This article outlines different types of data, the ways in which observable data, on their own, are insufficient for most quantitative analyses of interest, presents these limitations via a case study from Syria, and introduces statistical methods to overcome these limitations.

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