Introduction to this special section: AVO inversion

2019 ◽  
Vol 38 (10) ◽  
pp. 752-753
Author(s):  
Edward Townend ◽  
Michael Kemper

It has been more than three years since The Leading Edge last published a special section on amplitude variation with offset (AVO) inversion, and interest in the subject remains strong. This past spring, SEG hosted a joint symposium in Houston, Texas, on the “Resurgence of seismic inversion,” and the body of talks and case studies demonstrated the method's continued relevance to making impactful drilling decisions. Despite this, and despite AVO inversion's position as a mature and well-established technique, there are an abundance of examples in which inaccurate AVO predictions have led to drastic failures at the drill bit. This highlights the challenges that still exist in the successful execution of such investigations and makes the subject occasionally controversial and certainly fraught with data-quality and best-practice considerations. In this vein, the special section presented here offers examples of the broad sweep of considerations and methods relevant to enabling successful AVO inversion and the interpretation of its products, as well as case studies that demonstrate how application of the technique can be impactful all the way through to appraisal and field development programs.

2017 ◽  
Vol 14 (2/3) ◽  
pp. 194-203
Author(s):  
Stephanie Barnes ◽  
Nick Milton

Purpose Knowledge management really does make a difference; it is not just an academic idea. There are lots of case studies and examples of knowledge management activities having a significant impact on the results of an organization, and some examples will be cited in the body of the paper. However, Knoco’s Bird Island serious game is one of the quickest, easiest, and most enjoyable ways to make the point. The paper aims to discuss these issues. Design/methodology/approach This paper will review how Knoco’s Bird Island serious game is played. It will also discuss the results of over the almost 20 years that it has been played: what participants have experienced, what has been learned, and most importantly, the data that have been collected that help prove that sharing knowledge is a very powerful thing to do. Findings By using three different KM processes (after action reviews, peer assists, and best practice sharing) results of the activity go from abysmal to unbelievable, increasing by an average of 258 per cent, all because of reflecting, sharing, and learning. Even if participants want to continue to be sceptical of the results that making better use of their organization’s knowledge can have and they think they can only attain a fraction of this, 10 per cent of the demonstrated result is still almost 26 per cent. Isn’t that worth at least giving it a try? Originality/value Knoco has been running their serious game for almost two decades and have the data to prove it.


2021 ◽  
Author(s):  
◽  
Sarah Powell

<p>As pressure grows for cultural institutions to provide online access to images of collection objects, issues regarding copyright and reuse of materials arise. Yet little research has been conducted on the way heritage institutions within New Zealand have tackled these copyright issues and how they reach decisions to allow the reuse of digital content from their extensive online collections. Furthermore, there is a lack of academic investigation into what value any newly introduced reuse practices and policies can bring to cultural institutions and users of their digital content. My research explores how and why New Zealand’s two collecting domains, the National Library of New Zealand and the Museum of New Zealand Te Papa Tongarewa, provide openly licensed digital images of artefacts through online collection databases.  While literature on the topic of reuse of digitised documentary heritage collections is limited, previous research shows that there are myriad barriers surrounding the reuse of digitised collection objects, some of these include finding best practice for orphan works, acknowledging indigenous sensitivities, dealing with issues of trust and balancing commercial imperatives with public expectations. The body of literature also shows the opportunities and benefits that international cultural institutions have gained from establishing reuse practices for their digital collections, yet none offer insight from a New Zealand context.  Guided by this gap within the literature this dissertation investigates the establishment of use and reuse policies and practices by the National Library of New Zealand and the Museum of New Zealand Te Papa Tongarewa, and what value they feel this practice may bring to the sector. It explores each respective institution’s journey towards a connected commons through two in-depth qualitative case studies and concludes with a cross-case analysis. Within the cross-case analysis an Open GLAM Licensing Framework is proposed for Aotearoa that draws on the work that these institutions, along with other leading cultural institutions, have done in establishing reuse practices and policies for digital collections. This research contributes to Museum and Heritage Studies discourse by providing a snapshot of reuse in a New Zealand context and provides a valuable framework to evaluate the current motivations and processes of institutions establishing Open GLAM philosophies.</p>


2020 ◽  
Vol 17 (6) ◽  
pp. 993-1004
Author(s):  
Fanchang Zhang ◽  
Jingyang Yang ◽  
Chuanhui Li ◽  
Dong Li ◽  
Yang Gao

Abstract Reliably estimating reservoir parameters is the final target in reservoir characterisation. Conventionally, estimating reservoir characters from seismic inversion is implemented by indirect approaches. The indirect estimation of reservoir parameters from inverted elastic parameters, however, will produce large bias due to the propagation of errors in the procedure of inversion. Therefore, directly obtaining reservoir parameters from prestack seismic data through a rock-physical model and prestack amplitude variation with offset (AVO) inversion is proposed. A generalised AVO equation in terms of oil-porosity (OP), sand indicator (SI) and density is derived by combining a physical rock model and the Aki–Richards equation in a whole system. This makes it possible to perform direct inversion for reservoir parameters. Next, under Bayesian theorem, we develop a robust prestack inversion approach based on the new AVO equation. Tests on synthetic seismic gathers show that it can dramatically reduce the prediction error of reservoir parameters. Furthermore, field data application illustrates that reliable reservoir parameters can be directly obtained from prestack inversion.


2017 ◽  
Vol 5 (3) ◽  
pp. SLi-SLii
Author(s):  
Huyen Bui ◽  
Arthur Weglein ◽  
Sunil Kumar ◽  
Scott Singleton ◽  
Oswaldo Davogustto Cataldo ◽  
...  

2017 ◽  
Vol 5 (3) ◽  
pp. SL57-SL67 ◽  
Author(s):  
Guangsen Cheng ◽  
Xingyao Yin ◽  
Zhaoyun Zong

Prestack seismic inversion is widely used in fluid indication and reservoir prediction. Compared with linear inversion, nonlinear inversion is more precise and can be applied to high-contrast situations. The inversion results can be affected by the parameters’ sensitivity, so the parameterization of nonlinear equations is very significant. Considering the poor nonlinear amplitude-variation-with-offset (AVO) inversion results of impedance and velocity parameters, we adjust the parameters of the nonlinear equation, avoid the inaccuracy caused by parameters sensitivity and get the ideal nonlinear AVO inversion results of the Lamé parameters. The feasibility and stability of the nonlinear equation based on the Lamé parameters and method are verified by the model and the real data examples. The resolution and the lateral continuity of nonlinear inversion results are better compared with the linear inversion results.


2019 ◽  
Vol 38 (3) ◽  
pp. 178-178
Author(s):  
Ulrich Zimmer

Full-waveform inversion (FWI) is often the method of choice for addressing the most challenging scenarios in seismic imaging. While FWI has been around for quite some time, the workflows are continuously developed and more case studies are becoming available to illustrate the power of the method. This special section of The Leading Edge presents seven papers that not only provide an overview of the progress of the method but also suggest new tweaks to the algorithm and several new case studies.


2021 ◽  

The idea of the body as a mirror of the soul has fascinated mankind throughout history. Being able to see through an individual, and drawing conclusions on their character solely based on a selection of external features, is the subject of physiognomy, and has a long tradition running well into recent times. However, the pre-modern, especially medieval background of this discipline has remained underexplored. The selected case studies in this volume each contribute to a better understanding of the history of physiognomy from antiquity to the Renaissance, and offer discussions on unedited treatises and on the application, development, and reception of this field of knowledge, as well as on visual sources inspired by physiognomic theory.


2021 ◽  
Author(s):  
◽  
Sarah Powell

<p>As pressure grows for cultural institutions to provide online access to images of collection objects, issues regarding copyright and reuse of materials arise. Yet little research has been conducted on the way heritage institutions within New Zealand have tackled these copyright issues and how they reach decisions to allow the reuse of digital content from their extensive online collections. Furthermore, there is a lack of academic investigation into what value any newly introduced reuse practices and policies can bring to cultural institutions and users of their digital content. My research explores how and why New Zealand’s two collecting domains, the National Library of New Zealand and the Museum of New Zealand Te Papa Tongarewa, provide openly licensed digital images of artefacts through online collection databases.  While literature on the topic of reuse of digitised documentary heritage collections is limited, previous research shows that there are myriad barriers surrounding the reuse of digitised collection objects, some of these include finding best practice for orphan works, acknowledging indigenous sensitivities, dealing with issues of trust and balancing commercial imperatives with public expectations. The body of literature also shows the opportunities and benefits that international cultural institutions have gained from establishing reuse practices for their digital collections, yet none offer insight from a New Zealand context.  Guided by this gap within the literature this dissertation investigates the establishment of use and reuse policies and practices by the National Library of New Zealand and the Museum of New Zealand Te Papa Tongarewa, and what value they feel this practice may bring to the sector. It explores each respective institution’s journey towards a connected commons through two in-depth qualitative case studies and concludes with a cross-case analysis. Within the cross-case analysis an Open GLAM Licensing Framework is proposed for Aotearoa that draws on the work that these institutions, along with other leading cultural institutions, have done in establishing reuse practices and policies for digital collections. This research contributes to Museum and Heritage Studies discourse by providing a snapshot of reuse in a New Zealand context and provides a valuable framework to evaluate the current motivations and processes of institutions establishing Open GLAM philosophies.</p>


2009 ◽  
Vol 27 (1) ◽  
pp. 65-92
Author(s):  
Susan Jones

This article explores the diversity of British literary responses to Diaghilev's project, emphasising the way in which the subject matter and methodologies of Diaghilev's modernism were sometimes unexpectedly echoed in expressions of contemporary British writing. These discussions emerge both in writing about Diaghilev's work, and, more discretely, when references to the Russian Ballet find their way into the creative writing of the period, serving to anchor the texts in a particular cultural milieu or to suggest contemporary aesthetic problems in the domain of literary aesthetics developing in the period. Figures from disparate fields, including literature, music and the visual arts, brought to their criticism of the Ballets Russes their individual perspectives on its aesthetics, helping to consolidate the sense of its importance in contributing to the inter-disciplinary flavour of modernism across the arts. In the field of literature, not only did British writers evaluate the Ballets Russes in terms of their own poetics, their relationship to experimentation in the novel and in drama, they developed an increasing sense of the company's place in dance history, its choreographic innovations offering material for wider discussions, opening up the potential for literary modernism's interest in impersonality and in the ‘unsayable’, discussions of the body, primitivism and gender.


2018 ◽  
Vol 27 (1) ◽  
pp. 5-21
Author(s):  
Amanda Dennis

Lying in ditches, tromping through mud, wedged in urns, trash bins, buried in earth, bodies in Beckett appear anything but capable of acting meaningfully on their environments. Bodies in Beckett seem, rather, synonymous with abjection, brokenness, and passivity—as if the human were overcome by its materiality: odours, pain, foot sores, decreased mobility. To the extent that Beckett's personae act, they act vaguely (wandering) or engage in quasi-obsessive, repetitive tasks: maniacal rocking, rotating sucking stones and biscuits, uttering words evacuated of sense, ceaseless pacing. Perhaps the most vivid dramatization of bodies compelled to meaningless, repetitive movement is Quad (1981), Beckett's ‘ballet’ for television, in which four bodies in hooded robes repeat their series ad infinitum. By 1981, has all possibility for intentional action in Beckett been foreclosed? Are we doomed, as Hamm puts it, to an eternal repetition of the same? (‘Moments for nothing, now as always, time was never and time is over, reckoning closed and story ended.’)This article proposes an alternative reading of bodily abjection, passivity and compulsivity in Beckett, a reading that implies a version of agency more capacious than voluntarism. Focusing on Quad as an illustrative case, I show how, if we shift our focus from the body's diminished possibilities for movement to the imbrication of Beckett's personae in environments (a mound of earth), things, and objects, a different story emerges: rather than dramatizing the impossibility of action, Beckett's work may sketch plans for a more ecological, post-human version of agency, a more collaborative mode of ‘acting’ that eases the divide between the human, the world of inanimate objects, and the earth.Movements such as new materialism and object-oriented ontology challenge hierarchies among subjects, objects and environments, questioning the rigid distinction between animate and inanimate, and the notion of the Anthropocene emphasizes the influence of human activity on social and geological space. A major theoretical challenge that arises from such discourses (including 20th-century challenges to the idea of an autonomous, willing, subject) is to arrive at an account of agency robust enough to survive if not the ‘death of the subject’ then its imbrication in the material and social environment it acts upon. Beckett's treatment of the human body suggests a version of agency that draws strength from a body's interaction with its environment, such that meaning is formed in the nexus between body and world. Using the example of Quad, I show how representations of the body in Beckett disturb the opposition between compulsivity (when a body is driven to move or speak in the absence of intention) and creative invention. In Quad, serial repetition works to create an interface between body and world that is receptive to meanings outside the control of a human will. Paradoxically, compulsive repetition in Beckett, despite its uncomfortable closeness to addiction, harnesses a loss of individual control that proposes a more versatile and ecologically mindful understanding of human action.


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