Time-Lapse Seismic for Reservoir Management: Case Studies From Offshore Niger Delta, Nigeria

2016 ◽  
Vol 19 (03) ◽  
pp. 391-402
Author(s):  
Sunday Amoyedo ◽  
Emmanuel Ekut ◽  
Rasaki Salami ◽  
Liliana Goncalves-Ferreira ◽  
Pascal Desegaulx
Keyword(s):  
Case Studies ◽  
Niger Delta ◽  
Reservoir Management ◽  
Time Lapse ◽  
Seismic Survey ◽  
Elastic Model ◽  
Field Development ◽  
4D Seismic ◽  
The Impact

Summary This paper presents case studies focused on the interpretation and integration of seismic reservoir monitoring from several fields in conventional offshore and deepwater Niger Delta. The fields are characterized by different geological settings and development-maturity stages. We show different applications varying from qualitative to quantitative use of time-lapse (4D) seismic information. In the first case study, which is in shallow water, the field has specific reservoir-development challenges, simple geology, and is in phased development. On this field, 4D seismic, which was acquired several years ago, is characterized by poor seismic repeatability. Nevertheless, we show that because of improvements from seismic reprocessing, 4D seismic makes qualitative contributions to the ongoing field development. In the second case study, the field is characterized by complex geological settings. The 4D seismic is affected by overburden with strong lateral variations in velocity and steeply dipping structure (up to 40°). Prestack-depth-imaging (PSDM) 4D seismic is used in a more-qualitative manner to monitor gas injection, validate the geologic/reservoir models, optimize infill injector placement, and consequently, enhance field-development economics. The third case study presents a deep offshore field characterized by a complex depositional system for some reservoirs. In this example, good 4D-seismic repeatability (sum of source- and receiver-placement differences between surveys, dS+dR) is achieved, leading to an increased quantitative use of 4D monitoring for the assessment of sand/sand communication, mapping of oil/water (OWC) front, pressure evolution, and dynamic calibration of petro-elastic model (PEM), and also as a seismic-based production-logging tool. In addition, 4D seismic is used to update seismic interpretation, provide a better understanding of internal architecture of the reservoirs units, and, thereby, yield a more-robust reservoir model. The 4D seismic in this field is a key tool for field-development optimization and reservoir management. The last case study illustrates the need for seismic-feasibility studies to detect 4D responses related to production. In addition to assessing the impact of the field environment on the 4D- seismic signal, these studies also help in choosing the optimum seismic-survey type, design, and acquisition parameters. These studies would possibly lead to the adoption of new technologies such as broad-band streamer or nodes acquisition in the near future.

Time Lapse (4D) Seismic for Reservoir Management: Case Studies from Offshore Niger Delta, Nigeria

2014 ◽  
Author(s):  
Sunday Oluleye Amoyedo ◽  
Emmanuel Ekut ◽  
Rasaki Salami ◽  
Liliana Goncalves-Ferreira ◽  
Pascal Desegaulx
Keyword(s):  
Case Studies ◽  
Niger Delta ◽  
Reservoir Management ◽  
Time Lapse ◽  
4D Seismic

scholarly journals Time-Lapse Seismic Monitoring of Onshore Reservoirs in Niger Delta, Field ‘K’ as a Case Study

2017 ◽  
Vol 1 (1) ◽  
pp. 23-27 ◽  
Author(s):  
A. Ogbamikhumi ◽  
T. Tralagba ◽  
E. E. Osagiede
Keyword(s):  
Seismic Data ◽  
Acoustic Impedance ◽  
Niger Delta ◽  
Rock Physics ◽  
Time Lapse ◽  
Seismic Survey ◽  
Impedance Change ◽  
Data Set ◽  
Reservoir Fluid ◽  
4D Seismic

Field ‘K’ is a mature field in the coastal swamp onshore Niger delta, which has been producing since 1960. As a huge producing field with some potential for further sustainable production, field monitoring is therefore important in the identification of areas of unproduced hydrocarbon. This can be achieved by comparing production data with the corresponding changes in acoustic impedance observed in the maps generated from base survey (initial 3D seismic) and monitor seismic survey (4D seismic) across the field. This will enable the 4D seismic data set to be used for mapping reservoir details such as advancing water front and un-swept zones. The availability of good quality onshore time-lapse seismic data for Field ‘K’ acquired in 1987 and 2002 provided the opportunity to evaluate the effect of changes in reservoir fluid saturations on time-lapse amplitudes. Rock physics modelling and fluid substitution studies on well logs were carried out, and acoustic impedance change in the reservoir was estimated to be in the range of 0.25% to about 8%. Changes in reservoir fluid saturations were confirmed with time-lapse amplitudes within the crest area of the reservoir structure where reservoir porosity is 0.25%. In this paper, we demonstrated the use of repeat Seismic to delineate swept zones and areas hit with water override in a producing onshore reservoir.

The Impact of Fault Sealing and Transmissibility on Field Development. Case Study: Eureka Field Experience, Onshore Niger Delta

2020 ◽  
Author(s):  
Okiemute Amuboh ◽  
Suleiman Ahmed ◽  
Dolapo Enya ◽  
Gbolade Ibikunle ◽  
Imonite Imorame ◽  
...  
Keyword(s):  
Niger Delta ◽  
Field Experience ◽  
Field Development ◽  
The Impact

scholarly journals Blockchain in Health Care Innovation: Literature Review and Case Study From a Business Ecosystem Perspective (Preprint)

2020 ◽  
Author(s):  
Shuchih Ernest Chang ◽  
YiChian Chen
Keyword(s):  
Health Care ◽  
Life Cycle ◽  
Literature Review ◽  
Case Studies ◽  
Paradigm Shift ◽  
Potential Health ◽  
Business Ecosystem ◽  
Blockchain Technology ◽  
The Impact

BACKGROUND Blockchain technology is leveraging its innovative potential in various sectors and its transformation of business-related processes has drawn much attention. Topics of research interest have focused on medical and health care applications, while research implications have generally concluded in system design, literature reviews, and case studies. However, a general overview and knowledge about the impact on the health care ecosystem is limited. OBJECTIVE This paper explores a potential paradigm shift and ecosystem evolution in health care utilizing blockchain technology. METHODS A literature review with a case study on a pioneering initiative was conducted. With a systematic life cycle analysis, this study sheds light on the evolutionary development of blockchain in health care scenarios and its interactive relationship among stakeholders. RESULTS Four stages—birth, expansion, leadership, and self-renewal or death—in the life cycle of the business ecosystem were explored to elucidate the evolving trajectories of blockchain-based health care implementation. Focused impacts on the traditional health care industry are highlighted within each stage to further support the potential health care paradigm shift in the future. CONCLUSIONS This paper enriches the existing body of literature in this field by illustrating the potential of blockchain in fulfilling stakeholders’ needs and elucidating the phenomenon of coevolution within the health care ecosystem. Blockchain not only catalyzes the interactions among players but also facilitates the formation of the ecosystem life cycle. The collaborative network linked by blockchain may play a critical role on value creation, transfer, and sharing among the health care community. Future efforts may focus on empirical or case studies to validate the proposed evolution of the health care ecosystem.

E pluribus unum? Language diversity and the harmonization of company law in the European Union

2019 ◽  
Vol 26 (5) ◽  
pp. 669-690
Author(s):  
Federico M Mucciarelli
Keyword(s):  
European Union ◽  
Case Studies ◽  
Company Law ◽  
Language Diversity ◽  
The European Union ◽  
Freedom Of Establishment ◽  
First Case ◽  
Definition Of ◽  
The Impact

This work addresses the impact of language diversity and nation-specific doctrinal structures on harmonized company law in the EU. With this aim, two emblematic case studies will be analysed. The first case study is related to the definition of ‘merger’ adopted in the Company Law Directive 2017/1132 (originally in the Third Company Law Directive and the Cross-Border Merger Directive); by relying on the example of the SEVIC case decided by the Court of Justice of the European Union (CJEU), it will be shown that scholars’ and courts’ conception of the definition of ‘merger’ varies according to own domestic doctrinal structures. The second case study is related to the notion of ‘registered office’, which is key for establishing the scope of several harmonizing provisions and the freedom of establishment; this paper analyses terminological fluctuations across language versions of EU legislation and the impact of domestic taxonomies and legal debates upon the interpretation of these notions. These case studies show that company law concepts, despite their highly technical nature, are influenced by discourse constructions conducted within national interpretative communities, and by the language used to draft statutory instruments and discuss legal issues. The task of the CJEU is to counterbalance these local tendencies, and yet it is unlikely that doctrinal structures, rooted in national languages and legal cultures, will disappear.

Environmental education in libraries – theoretical foundations and practical implementation

2020 ◽  
Vol 41 (4/5) ◽  
pp. 279-293 ◽  
Author(s):  
Małgorzata Fedorowicz-Kruszewska
Keyword(s):  
Sustainable Development ◽  
Environmental Education ◽  
Case Studies ◽  
New Paradigm ◽  
Professional Literature ◽  
Content Type ◽  
Multiple Case ◽  
Main Components ◽  
The Impact

PurposeThe purpose of this paper is to explain the concepts related to environmental education in the context of sustainable development, to indicate the links between them as well as to identify and organize elements of library activities that have the potential to implement environmental education.Design/methodology/approachThe method of analysis and criticism of scientific and professional literature and research reports was used. The multiple case study method was also used.FindingsAn analysis of literature and multiple case studies confirms the assumption that sustainable development is now a new paradigm of librarianship. Among the goals of sustainable development are environmental goals, which in libraries can be achieved through environmental education. A broad approach to environmental education has been proposed, which is implemented not only by using library services but also by building green collections, contacts with environmentally involved librarians, using ecological library infrastructure, observing sustainable management methods in libraries, cooperation between the library and the external environment in terms of the natural environment.Research limitations/implicationsAn analysis of 20 case studies was carried out regarding the implementation of pro-environmental measures in libraries. Examination of a larger number of case studies would probably give a more complete picture of this area of activity in libraries. The next stage of research should be the development of standards/guidelines in the field of environmental education in libraries, and then the development of methods and techniques for assessing the quality of library activities in this area and methods for assessing the impact of libraries on society and the environment in the field of environmental education.Practical implicationsThe paper indicates – based on case study analyses – those library elements that have potential in the field of environmental education. They were ordered in categories that were assigned to the three main components of a library: people, artefacts and processes.Social implicationsSustainable development is a new library paradigm. The paper focuses on the environmental area, specifically environmental education. It has been recognized that libraries have considerable potential for environmental education and should be seen as socially responsible organizations that take responsibility for the impact of their decisions and actions on society and the environment.Originality/valueThe paper explains the basic concepts of environmental education and the relationships between them. It defines the area of environmental education in libraries in terms of library activity elements that can be used to organize them according to the three main components of a library, which are people, artefacts and processes. The paper also indicates that sustainable development should be treated as a new paradigm of librarianship, and environmental education as a new research field of library and information science.

Assessment of 4D seismic repeatability and CO2 detection limits using a sparse permanent land array at the Aquistore CO2 storage site

Geophysics ◽  
2015 ◽  
Vol 80 (2) ◽  
pp. WA1-WA13 ◽  
Author(s):  
Lisa A. N. Roach ◽  
Donald J. White ◽  
Brian Roberts
Keyword(s):  
Co2 Storage ◽  
Time Lapse ◽  
Data Sets ◽  
Storage Site ◽  
Processing Sequence ◽  
Time Migration ◽  
Receiver Array ◽  
Co2 Detection ◽  
4D Seismic ◽  
The Impact

Two 3D time-lapse seismic surveys were acquired in 2012 and 2013 at the Aquistore [Formula: see text] storage site prior to the start of [Formula: see text] injection. Using these surveys, we determined the background time-lapse noise at the site and assessed the feasibility of using a sparse areal permanent receiver array as a monitoring tool. Applying a standard processing sequence to these data, we adequately imaged the reservoir at 3150–3350 m depth. Evaluation of the impact of each processing step on the repeatability revealed a general monotonic increase in similarity between the data sets as a function of processing. The prestack processing sequence reduced the normalized root mean squared difference (nrms) from 1.13 between the raw stacks to 0.13 after poststack time migration. The postmigration cross-equalization sequence further reduced the global nrms to 0.07. A simulation of the changes in seismic response due to a range of [Formula: see text] injection scenarios suggested that [Formula: see text] was detectable within the reservoir at the Aquistore site provided that zones of greater thickness than 6–13 m have reached [Formula: see text] saturations of greater than 5%.

Meta-analysis of U.S. intermediated food markets: Measuring what matters

2016 ◽  
Vol 118 (5) ◽  
Author(s):  
Blake E. Angelo ◽  
Becca B.R. Jablonski ◽  
Dawn Thilmany
Keyword(s):  
Case Studies ◽  
Value Chain ◽  
Design Methodology ◽  
Meta Analysis ◽  
Lessons Learned ◽  
Value Chains ◽  
The Impact ◽  
Food Value ◽  
Study Development

Purpose A body of literature and case studies has developed as part of the reporting, outreach and evaluation of the local and regional food system projects supported by grants and other funders. Yet, there is concern that food value chains are promoted without adequately evaluating the viability of these businesses, or how these markets affect the performance and welfare of key stakeholders: farm vendors and local communities/economies. Design/methodology/approach This paper reviews and summarizes a comprehensive set of U.S.-based case studies focused on food value chains. We conduct a meta-analysis to systematically capture what available case study evidence tells us about: 1) trends in the viability of food value chain businesses; 2) the impact of these businesses on participating farm vendors; and, 3) the associated community economic development outcomes (framed in terms of ‘wealth creation’). Findings In addition to sharing findings from the meta-analysis, we demonstrate how the lack of standardized protocols for case study development is a barrier to learning about metric comparisons, best practices, and what impacts these food value chain businesses may have. We conclude with some recommendations of how the field can move forward to evaluate and share lessons learned using more uniform, project-driven case study development. Originality/value This is the first study to conduct a systematic meta-analysis of U.S. food value chain businesses.

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