scholarly journals Key controls on the hydraulic properties of fault rocks in carbonates

2020 ◽  
pp. petgeo2020-034
Author(s):  
E. A. H. Michie ◽  
A. P. Cooke ◽  
I. Kaminskaite ◽  
J. C. Stead ◽  
G. E. Plenderleith ◽  
...  
Keyword(s):  
Carbonate Reservoirs ◽  
Rock Properties ◽  
Burial Depth ◽  
Extrinsic Factors ◽  
Fault Rock ◽  
Fault Rocks ◽  
Content Type ◽  
Intrinsic Factors ◽  
Hydraulic Behaviour ◽  
Porosity And Permeability

A significant knowledge gap exists when analysing and predicting the hydraulic behaviour of faults within carbonate reservoirs. To improve this, a large database of carbonate fault rock properties has been collected from 42 exposed faults, from seven countries. Faults analysed cut a range of lithofacies, tectonic histories, burial depths and displacements. Porosity and permeability measurements from c. 400 samples have been made, with the goal of identifying key controls on the flow properties of fault rocks in carbonates. Intrinsic and extrinsic factors have been examined, such as host lithofacies, juxtaposition, host porosity and permeability, tectonic regime, displacement, and maximum burial depth, as well as the depth at the time of faulting. The results indicate which factors may have had the most significant influence on fault rock permeability, improving our ability to predict the sealing or baffle behaviour of faults in carbonate reservoirs. Intrinsic factors, such as host porosity, permeability and texture, appear to play the most important role in fault rock development. Extrinsic factors, such as displacement and kinematics, have shown lesser or, in some instances, a negligible control on fault rock development. This conclusion is, however, subject to two research limitations: lack of sufficient data from similar lithofacies at different displacements, and a low number of samples from thrust regimes.Thematic collection: This article is part of the Fault and top seals collection available at: https://www.lyellcollection.org/cc/fault-and-top-seals-2019

scholarly journals Developing evaluation of signage for people with dementia

2019 ◽  
Vol 22 (3) ◽  
pp. 153-161 ◽  
Author(s):  
Meredith Gresham ◽  
Liz Taylor ◽  
Sarah Keyes ◽  
Heather Wilkinson ◽  
Danielle McIntosh ◽  
...  
Keyword(s):  
Design Methodology ◽  
Evaluation Framework ◽  
Prior Work ◽  
Extrinsic Factors ◽  
Content Type ◽  
Intrinsic Factors ◽  
People With Dementia ◽  
World Cafe ◽  
Cent Level ◽  
Level Of Agreement

PurposeThe purpose of this paper is to to describe development of a framework for use in the evaluation of the effectiveness of signage to assist people with dementia.Design/methodology/approachThe study consisted of two parts. Workshops held in both Sydney and Edinburgh using “world café” methodology with 28 knowledgeable participants produced a pool of statements. These were subsequently used in a three-round Delphi process administered to 38 participants in order to generate ideas and develop consensus content for a signage evaluation framework.FindingsThis process resulted in a framework consisting of Delphi statements which had a 70 per cent level of agreement and a series of prompt questions. Both intrinsic factors and wider environmental, extrinsic factors in signage for wayfinding were identified.Research limitations/implicationsLimitations of this study were the small number of participants, including only four people with dementia, and the unresolved problems inherent in designing signage that may simultaneously be universally relevant and readily understood, yet meets the idiosyncratic needs of each individual living with dementia.Originality/valueAs there is little prior work in this field concerning signage use by people with dementia, this framework provides an original preliminary tool that may be used in further research on evaluating signage effectiveness. In designing signage and testing its effectiveness, it was concluded that the direct involvement of people with dementia is essential.

Motivations of choosing archival studies as major in the iSchools: viewpoint between two universities across the Pacific Ocean

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Tracy Chui Wan Ng ◽  
Dickson K.W. Chiu ◽  
KIng Kwan Li
Keyword(s):  
Hong Kong ◽  
Data Gathering ◽  
Working Environment ◽  
Archival Studies ◽  
Career Motivation ◽  
Graduate Studies ◽  
Extrinsic Factors ◽  
Content Type ◽  
Intrinsic Factors ◽  
Motivation Factors

PurposeThis study explores the learning and career motivation of the students who have chosen archival studies as their major in their master's degree programs, which has scant prior research.Design/methodology/approachThe authors use a qualitative interview method to investigate the students' opinions and underlying reasons. Nine students from the University of Hong Kong (HKU) and University of British Columbia (UBC), both members of the iSchools, were interviewed. Considering the responses and research questions, the authors applied content analysis techniques to summarize data gathering from interviews into five themes to better interpret the meanings behind them.FindingsDespite different development stages of archives sectors in Hong Kong and Canada, the learning and career motivation factors of these students from both universities share some similar characteristics and can also be divided into intrinsic factors (such as personal interests, personalities) and extrinsic factors (such as prior working experience, working environment, nature of archives work and development of the archives field). Both intrinsic and extrinsic factors significantly influenced them in choosing archival studies as major in their graduate studies.Practical implicationsThese findings can help educators and professions review and improve the curricula as well as promote the profession to the public and attract more people to pursue their studies in the archives field.Originality/valueScant studies discussed the career development and education motivation of archivists, especially related to Asia.

Permeability of carbonate fault rocks: a case study from Malta

2019 ◽  
Vol 26 (3) ◽  
pp. 418-433 ◽  
Author(s):  
Andy P. Cooke ◽  
Quentin J. Fisher ◽  
Emma A. H. Michie ◽  
Graham Yielding
Keyword(s):  
Fluid Flow ◽  
Host Rock ◽  
Damage Zone ◽  
Fault Zones ◽  
High Porosity ◽  
Rock Permeability ◽  
Fault Rock ◽  
Fault Rocks ◽  
Diagenetic Alteration ◽  
Hydraulic Behaviour

The inherent heterogeneity of carbonate rocks suggests that carbonate-hosted fault zones are also likely to be heterogeneous. Coupled with a lack of host–fault petrophysical relationships, this makes the hydraulic behaviour of carbonate-hosted fault zones difficult to predict. Here we investigate the link between host rock and fault rock porosity, permeability and texture, by presenting data from series of host rock, damage zone and fault rock samples from normally faulted, shallowly buried limestones from Malta. Core plug X-ray tomography indicates that texturally heterogeneous host rocks lead to greater variability in the porosity and permeability of fault rocks. Fault rocks derived from moderate- to high-porosity (>20%) formations experience permeability reductions of up to six orders of magnitude relative to the host; >30% of these fault rocks could act as baffles or barriers to fluid flow over production timescales. Fault rocks derived from lower-porosity (<20%) algal packstones have permeabilities that are lower than their hosts by up to three orders of magnitude, which is unlikely to impact fluid flow on production timescales. The variability of fault rock permeability is controlled by a number of factors, including the initial host rock texture and porosity, the magnitude of strain localization, and the extent of post-deformation diagenetic alteration. Fault displacement has no obvious control over fault rock permeability. The results enable better predictions of fault rock permeability in similar lithotypes and tectonic regimes. This may enable predictions of across-fault fluid flow potential when combined with data on fault zone architecture.

Traversing the women entrepreneurship in South Asia

2018 ◽  
Vol 12 (1) ◽  
pp. 50-66 ◽  
Author(s):  
Tanu Shukla ◽  
Gajendra Singh Chauhan ◽  
Saumya Saumya
Keyword(s):  
Quantitative Research ◽  
First Generation ◽  
Barriers To Entry ◽  
Structured Interviews ◽  
Extrinsic Factors ◽  
Female Entrepreneurs ◽  
Content Type ◽  
Intrinsic Factors ◽  
Complex Picture ◽  
The Impact

PurposeMarginalization of women in STEM sectors is a widely discussed trend that has percolated into the corporate sector. The purpose of this study is to identify factors that act as barriers to entry to female entrepreneurs and to understand the impact of these factors in the context of startup landscape. The scope of this paper covers chiefly first-generation entrepreneurs while elaborating the presence of the Lucite ceiling effect. It aims to categorize and elucidate the responsible variables while developing a model for the same.Design/methodology/approachThe research is an exploratory study that provides a complex picture of how female entrepreneurs understand and experience the work culture at their workplace. The population under consideration is “urban startups”; these have been characterized as technology/non-technology-based and non-agricultural in nature. The sample in the study consists of male and female entrepreneurs of first-generation entrepreneurs belonging to the urban middle class and either founders or co-founders. The exploration presents a groundbreaking examination based on narrative inquiry and semi-structured interviews.FindingsThe research led to distinct findings that can be utilized to improve the condition of female entrepreneurs and encourage their involvement in the ecosystem. The model is proposed on the basis of extrinsic and intrinsic factors, which lead to the Lucite ceiling phenomenon. The causes ranging from family pressure to fulfilling relevant requirements such as financing the venture were classified under these. Ultimately, inferences were drawn as to how these may be affecting the growth of women in the sectors.Research limitations/implicationsThe identified intrinsic and extrinsic factors have been detailed, presenting further opportunities to focus on specific metrics by the stakeholders, namely, the policy-makers and the entrepreneur community. The study has been limited to urban startups to allow for convenience sampling, which is justified considering the issues highlighted in the existing knowledge. While this study has been carried out in the context of urban startups, it leaves scope for extension and extrapolation of the presented model in the rural context.Practical implicationsThe study presents a formally structured representation of the issues faced by female entrepreneurs in a manner which is mutually exclusive and collectively exhaustive. Such a categorization can, in the contemporary times, enable targeted mitigation of the same through well-planned policy initiatives and legislation. In addition, it provides a strong baseline for extensive quantitative research in this field, especially in the context of emerging economies in fast-developing nations.Originality/valueThe framework helps lay a groundwork for thoughtful research on women’s entrepreneurship. The Lucite ceiling phenomenon is a more aggravated version of the “glass ceiling”. The reasons for the prevalence of this effect in this context have not been explored before, thus providing a great scope to be further investigated.

Institutional Environment, Entrepreneurial Self-Efficacy and Entrepreneurial Intention of Company Employees

1970 ◽  
Vol 3 (1) ◽  
pp. 1-9
Author(s):  
Devi Angrahini Anni Lembana ◽  
Yu Yu Chang ◽  
Wen Ke Liang
Keyword(s):  
Self Efficacy ◽  
Institutional Environment ◽  
Practical Experience ◽  
Entrepreneurial Intention ◽  
Entrepreneurial Intentions ◽  
New Venture ◽  
Hierarchical Regression ◽  
Market Demand ◽  
Extrinsic Factors ◽  
Intrinsic Factors

From the intentionality-based view, individuals' actual behaviors to initiate a new venture is driven by their entrepreneurial intentions. Company employees have accumulated professionalism and practical experience, which both enable them to discover some unmet market demand and industrial gaps. However, in establishing a new business, not everyone with certain knowledge or expertise has the desire to become an entrepreneur. Prior research has shown that entrepreneurial intentions are under the profound influences of intrinsic factors and extrinsic factors. On the one hand, entrepreneurial self-efficacy is one of the key psychological states that makes someone dare to initiate entrepreneurial activities. Institutional environment, on the other hand, can either enhance and hinder an individuals' entrepreneurial motivation by offering incentives or causing barriers. Little work has been done to understand how the institutional environment and entrepreneurial self-efficacy jointly affect company employees' intention to quit their job and start an enterprising career. By using hierarchical regression on a sample of 325 Indonesian company employees, this paper shows that the entrepreneurial cognition and entrepreneurial self-efficacy are positively related to employees' entrepreneurial intentions. Also, entrepreneurial self-efficacy strengthens the effect of normative Approval on entrepreneurial intention, whereas the regulatory Support from Government is detrimental to company employees' intention to start a new venture regardless the entrepreneurial self-efficacy is high or low.

scholarly journals Modulation of odour-guided behaviour in mosquitoes

2021 ◽  
Vol 383 (1) ◽  
pp. 195-206
Author(s):  
Sharon R. Hill ◽  
Rickard Ignell
Keyword(s):  
Functional Genomics ◽  
Life Stage ◽  
Blood Feeding ◽  
Model Systems ◽  
Extrinsic Factors ◽  
Intrinsic Factors ◽  
Host Seeking ◽  
Enhancing Resources ◽  
Maturation Age ◽  
Behavioural Repertoire

AbstractMosquitoes are emerging as model systems with which to study innate behaviours through neuroethology and functional genomics. Decades of work on these disease vectors have provided a solid behavioural framework describing the distinct repertoire of predominantly odour-mediated behaviours of female mosquitoes, and their dependence on life stage (intrinsic factors) and environmental cues (extrinsic factors). The purpose of this review is to provide an overview of how intrinsic factors, including adult maturation, age, nutritional status, and infection, affect the attraction to plants and feeding on plant fluids, host seeking, blood feeding, supplemental feeding behaviours, pre-oviposition behaviour, and oviposition in female mosquitoes. With the technological advancements in the recent two decades, we have gained a better understanding of which volatile organic compounds are used by mosquitoes to recognise and discriminate among various fitness-enhancing resources, and characterised their neural and molecular correlates. In this review, we present the state of the art of the peripheral olfactory system as described by the neural physiology, functional genomics, and genetics underlying the demonstrated changes in the behavioural repertoire in female mosquitoes. The review is meant as a summary introduction to the current conceptual thinking in the field.

scholarly journals Landscape Characteristics Based on Effectiveness of Wildlife Crossing Structures in South Korea

2021 ◽  
Vol 13 (2) ◽  
pp. 675
Author(s):  
Hyunjin Seo ◽  
Chulhyun Choi ◽  
Kyeongjun Lee ◽  
Donggul Woo
Keyword(s):  
Landscape Management ◽  
Spatial Pattern Analysis ◽  
Extrinsic Factors ◽  
Intrinsic Factors ◽  
Landscape Characteristics ◽  
Crossing Structures ◽  
Significant Difference ◽  
Management Plans ◽  
Wildlife Crossing Structures ◽  
Surrounding Landscape

Roads are notable and responsible for the loss of biodiversity and disruption of wildlife habitats connectivity. Wildlife crossing structures (WCS) help wildlife move between habitats by connecting fragmented habitats. Their effectiveness is affected by various factors. Here, to identify methods for improving the effectiveness of wildlife crossing structures, we controlled the effect of intrinsic factors, such as size, that are difficult to improve in an already installed area, and then, evaluated the differences in extrinsic factors using 12 landscape characteristics. Our results show that 18 wildlife crossing structures were selected with propensity-score (PS) matching method. The surrounding landscape characteristics differed between high-effectiveness wildlife crossing structures and low-effectiveness wildlife crossing structures. Particularly, there was a significant difference between the ‘statutory protected area’ and the ‘edge’ index of the morphological spatial pattern analysis among the landscape characteristic variables derived within 1 km2 of wildlife crossing structures. We empirically demonstrate that characteristics around highly effective WCS, statutory protected areas are widely distributed, and the ratio of edge of MSPA is low (within 1 km2). Therefore, an important outcome of our research is the demonstration that management of WCS itself is important, but conservation of surrounding habitats and landscape management plans are also significant.

Foraging behavior and predation success of the sand viper (Cerastes vipera)

2009 ◽  
Vol 87 (6) ◽  
pp. 520-528 ◽  
Author(s):  
Aziz Subach ◽  
Inon Scharf ◽  
Ofer Ovadia
Keyword(s):  
Length Ratio ◽  
Annual Rainfall ◽  
Activity Levels ◽  
Extrinsic Factors ◽  
Hunger Level ◽  
Intrinsic Factors ◽  
Thermal Range ◽  
Capture Success ◽  
Study Sites ◽  
Consequent Increase

Activity levels and foraging success of ectotherms are dependent both on extrinsic factors (e.g., ambient temperature) and intrinsic factors (e.g., hunger level). We focus here on activity and foraging of sand vipers ( Cerastes vipera (L., 1758)) (Squamata: Viperidae) in the northwestern Negev desert of Israel. Viper activity is bounded by a specific thermal range, but within this range, temperature does not affect the distance moved. Movement distances are, however, positively correlated with relative humidity. The capture success of lizards, the main prey of this viper, is strongly related both to movement distances of the snake and to the number of the lizard burrows scanned. Body size and shape have a direct effect on the number of burrows scanned and on the number of lizards captured. The increase in capture success with size is probably due to the consequent increase in the range of prey items the sand viper can subdue or handle. Vipers are larger and have a higher mass to length ratio in one of the three study sites, characterized by higher mean annual rainfall and vegetation cover. Finally, females tend to have a higher mass to length ratio than males, which may provide some space within the female body for reproductive materials such as eggs.

scholarly journals Spatial variation in porosity and permeability of the Rupel Clay Member in the Netherlands

2016 ◽  
Vol 95 (3) ◽  
pp. 253-268 ◽  
Author(s):  
Hanneke Verweij ◽  
Geert-Jan Vis ◽  
Elke Imberechts
Keyword(s):  
The Netherlands ◽  
Spatial Variation ◽  
Clay Content ◽  
Burial Depth ◽  
Southeastern Part ◽  
Boom Clay ◽  
The North ◽  
Sealing Capacity ◽  
Porosity And Permeability ◽  
Permeability Data

AbstractThe spatial distribution of porosity and permeability of the Rupel Clay Member is of key importance to evaluate the spatial variation of its sealing capacity and groundwater flow condition. There are only a limited number of measured porosity and permeability data of the Rupel Clay Member in the onshore Netherlands and these data are restricted to shallow depths in the order of tens of metres below surface. Grain sizes measured by laser diffraction and SediGraph® in samples of the Rupel Clay Member taken from boreholes spread across the country were used to generate new porosity and permeability data for the Rupel Clay Member located at greater burial depth. Effective stress and clay content are important parameters in the applied grain-size based calculations of porosity and permeability.The calculation method was first tested on measured data of the Belgian Boom Clay. The test results showed good agreement between calculated permeability and measured hydraulic conductivity for depths exceeding 200m.The spatial variation in lithology, heterogeneity and also burial depth of the Rupel Clay Member in the Netherlands are apparent in the variation of the calculated permeability. The samples from the north of the country consist almost entirely of muds and as a consequence show little lithology-related variation in permeability. The vertical variation in permeability in the more heterogeneous Rupel Clay Member in the southern and east-southeastern part of the country can reach several orders of magnitude due to increased permeability of the coarser-grained layers.

Using Logging and Seismic Data to Identify Boundaries Between Different OWC Units in a Deepwater Carbonate Reservoirs

2021 ◽  
Author(s):  
Kangxu Ren ◽  
Junfeng Zhao ◽  
Jian Zhao ◽  
Xilong Sun
Keyword(s):  
Seismic Data ◽  
Carbonate Rocks ◽  
Carbonate Reservoir ◽  
Carbonate Reservoirs ◽  
Sedimentary Process ◽  
Core Samples ◽  
Tight Carbonate ◽  
Porosity And Permeability ◽  
Seismic Sections ◽  
Parameters Inversion

Abstract At least three very different oil-water contacts (OWC) encountered in the deepwater, huge anticline, pre-salt carbonate reservoirs of X oilfield, Santos Basin, Brazil. The boundaries identification between different OWC units was very important to help calculating the reserves in place, which was the core factor for the development campaign. Based on analysis of wells pressure interference testing data, and interpretation of tight intervals in boreholes, predicating the pre-salt distribution of igneous rocks, intrusion baked aureoles, the silicification and the high GR carbonate rocks, the viewpoint of boundaries developed between different OWC sub-units in the lower parts of this complex carbonate reservoirs had been better understood. Core samples, logging curves, including conventional logging and other special types such as NMR, UBI and ECS, as well as the multi-parameters inversion seismic data, were adopted to confirm the tight intervals in boreholes and to predicate the possible divided boundaries between wells. In the X oilfield, hundreds of meters pre-salt carbonate reservoir had been confirmed to be laterally connected, i.e., the connected intervals including almost the whole Barra Velha Formation and/or the main parts of the Itapema Formation. However, in the middle and/or the lower sections of pre-salt target layers, the situation changed because there developed many complicated tight bodies, which were formed by intrusive diabase dykes and/or sills and the tight carbonate rocks. Many pre-salt inner-layers diabases in X oilfield had very low porosity and permeability. The tight carbonate rocks mostly developed either during early sedimentary process or by latter intrusion metamorphism and/or silicification. Tight bodies were firstly identified in drilled wells with the help of core samples and logging curves. Then, the continuous boundary were discerned on inversion seismic sections marked by wells. This paper showed the idea of coupling the different OWC units in a deepwater pre-salt carbonate play with complicated tight bodies. With the marking of wells, spatial distributions of tight layers were successfully discerned and predicated on inversion seismic sections.

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