Academic literature on the topic 'Localized complexities'
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Journal articles on the topic "Localized complexities"
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Wei, Yuting, Fanny Yang, and Martin J. Wainwright. "Early Stopping for Kernel Boosting Algorithms: A General Analysis With Localized Complexities." IEEE Transactions on Information Theory 65, no. 10 (October 2019): 6685–703. http://dx.doi.org/10.1109/tit.2019.2927563.
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Gottlieb, Alice B., and Michelle E. Weisfelner. "A Case of Familial Psoriasis with Predominant Hand Involvement." Journal of Cutaneous Medicine and Surgery 7, no. 6 (November 2003): 464–66. http://dx.doi.org/10.1177/120347540300700607.
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Psoriasis has been recognized as a familial disease with a polygenic inheritance. A case is reported of a father and four of his seven children with plaque psoriasis localized to the hands. The other three children are not afflicted by psoriasis. All patients developed psoriasis at 5 years of age. Only one member of this family has involvement in an area other than the hands. This case illustrates some of the complexities of the genetics of psoriasis.
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Vidal, Cristiane Denise. "When a robot understands Brazilian Portuguese." Journal of Internationalization and Localization 5, no. 1 (August 10, 2018): 49–73. http://dx.doi.org/10.1075/jial.00010.vid.
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Abstract This paper sets out to highlight some of the complexities involved in the game localization process by presenting a case study centered on the educational game Ludwig. It was released in Austria in 2011 just in German and later, due to its success, it was later localized into English, Brazilian Portuguese, Chinese and Japanese. The case study focusses on the localization of the language pair English-Brazilian Portuguese and the theoretical framework relies on the notion of Paratranslation (Yuste Frías 2012).
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Wagner, Matthew B., Amir Younan, Paul Allaire, and Randy Cogill. "Model Reduction Methods for Rotor Dynamic Analysis: A Survey and Review." International Journal of Rotating Machinery 2010 (2010): 1–17. http://dx.doi.org/10.1155/2010/273716.
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The focus of this literature survey and review is model reduction methods and their application to rotor dynamic systems. Rotor dynamic systems require careful consideration in their dynamic models as they include unsymmetric stiffness, localized nonproportional damping, and frequency-dependent gyroscopic effects. The literature reviewed originates from both controls and mechanical systems analysis and has been previously applied to rotor systems. This survey discusses the previous literature reviews on model reduction, reduction methods applied to rotor systems, the current state of these reduction methods in rotor dynamics, and the ability of the literature to reduce the complexities of large order rotor dynamic systems but allow accurate solutions.
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Doering, Adam, and Clifton Evers. "Maintaining Masculinities in Japan’s Transnational Surfscapes: Space, Place, and Gender." Journal of Sport and Social Issues 43, no. 5 (August 12, 2019): 386–406. http://dx.doi.org/10.1177/0193723519867584.
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This article examines the local practices, histories, and transnational circulation and exchange of gender ideologies within Japanese surfscapes. A focus on gender in relation to Japanese surf culture is critical as the ways surf spaces in Japan are governed and/or have changed in recent years has as much to do with transnational gender surf ideologies as with its domestic gender norms. More specifically, we examine how gendered ideologies in Japan are mobilized in particular ways depending on the conditions of possibility—the cultural, social, geographical, historical, and networked elements—that comprise any given surfscape. To draw attention to the complexities involved in the relationship between space, place, and gender in Japan, the enquiry is undertaken in a highly localized, territorial, and big-wave surf site in Wakayama Prefecture and surrounding Kansai region. This site has been chosen because of how it localizes a unique mode of trans-Pacific surf culture, thereby offering insight into the nuances, issues, and strategies of social change as surfing continues to evolve in the region. The aim of the analysis is twofold. The first is contextual, highlighting the importance of the culturally and site-specific character of how surf culture and gender relations are assembled in the Japanese context. The second is to offer insight into the specific histories and transnational relationships informing the gendered practices of surfing in Japan today. The intention is to highlight the diversity of surf cultures throughout East Asia and the different ways surfing lifestyles are localized in relation to socio-political-ecological place-making and gender.
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Xiao, Xiangkai, and Baofang Song. "Kinematics and Dynamics of Turbulent Bands at Low Reynolds Numbers in Channel Flow." Entropy 22, no. 10 (October 16, 2020): 1167. http://dx.doi.org/10.3390/e22101167.
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Channel flow turbulence exhibits interesting spatiotemporal complexities at transitional Reynolds numbers. In this paper, we investigated some aspects of the kinematics and dynamics of fully localized turbulent bands in large flow domains. We discussed the recent advancement in the understanding of the wave-generation at the downstream end of fully localized bands. Based on the discussion, we proposed a possible mechanism for the tilt direction selection. We measured the propagation speed of the downstream end and the advection speed of the low-speed streaks in the bulk of turbulent bands at various Reynolds numbers. Instead of measuring the tilt angle by treating an entire band as a tilted object as in prior studies, we proposed that, from the point of view of the formation and growth of turbulent bands, the tilt angle should be determined by the relative speed between the downstream end and the streaks in the bulk. We obtained a good agreement between our calculation of the tilt angle and the reported results in the literature at relatively low Reynolds numbers.
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Wimalasinghe, Rochelle, and Tharusha N. Gooneratne. "Control practices in a traditional industry in Sri Lanka: an institutional logics perspective." Qualitative Research in Accounting & Management 16, no. 1 (April 15, 2019): 93–116. http://dx.doi.org/10.1108/qram-07-2017-0071.
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Purpose The purpose of this paper is to explore the co-existence of multiple logics, resulting complexities and their implications on control practices within a traditional industry (southern cinnamon) in Sri Lanka. Design/methodology/approach The paper is premised upon the qualitative methodology and case study approach, while the theoretical backing is provided by the institutional logics perspective. Findings The findings reveal that controls are exercised in the southern cinnamon industry to manage competing facets stemming from the co-existence of multiple logics, such as family logic, commercial logic and state logic. Amid the recurring complexity caused by competing logics, the industry remains in a state of control through mediators, such as the exporter trade union (the Spice Council), which although predominantly guided by commercial logic, acts in easing-off tensions between competing logics, while serving the interest of multiple actors. Controls in southern cinnamon nevertheless take a peculiar form, giving way to the continuation of traditional rudimentary practices, which essentially represent the interests of ground level actors. Originality/value Moving beyond corporate settings, which are the typical focus of mainstream studies, this paper adds to the existing body of knowledge on control practices in traditional industries, where informal and localized controls prevail. Theoretically, it expands the use of the institutional logics perspective, recognizing multiple logics, tensions and complexities in management control research. In doing so, the authors probe into informal control mechanisms in traditional industries to understand the controls and complexities in practice. Practically, the paper portrays beliefs, issues and incidents in the field (of the southern cinnamon industry in Sri Lanka), which explains why the field operates as it does, thereby offering insights to actors in the field, ranging from practitioners to policymakers.
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Johnston, Ian, Vincent M. Hayes, Douglas B. Cines, and Mortimer Poncz. "A Targeted Photochemical Microfluidic Vascular Injury Model for in Vitro Thrombosis Studies: Usage in Heparin-Induced Thrombocytopenia (HIT)." Blood 126, no. 23 (December 3, 2015): 212. http://dx.doi.org/10.1182/blood.v126.23.212.212.
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Abstract Replicating the complexities of the human blood vessel include the establishment of a 3-D confluency of viable endothelial cells (ECs) on an appropriate matrix, use of human whole blood or specific components of blood, varied shear stresses, and the induction of a localized and controlled injury within the observable field to understand and intervene in hemostatic events. This array of complexities have made vascular modeling an important unmet challenge. Such a model would enhance our understanding of the pathogenesis of diverse coagulation disorders, such as the prothrombotic disorder HIT. In HIT, the platelet-rich clots lead to its other designation as the "white clot syndrome". To provide an improved injury model, we adapted a hematoporphyrin-photochemical injury using a Fluxion Bioflux microfluidic system. When illuminated with 405 nm light, hematoporphyrin releases reactive oxygen species, inducing localized EC injury within the exposed field, but without denuding ECs. Unlike rose bengal, hematoporphyrin does not cause fluorescent interference with quantitative analysis of the developing thrombus. We propose that the model permits refined analysis of ECs transitioning from areas of quiescence to injury to quiescence, allowing us to localize and quantify the contribution of various components to the growing thrombus. In HIT, patients form antibodies to complexes of the platelet-specific chemokine, platelet factor 4 (PF4), and negatively-charged molecules such as infused heparin and heparans found on the surface of platelets and monocytes. ECs also bind PF4 immune complexes due to their highly negatively charged glycocalyx-rich surface. Prior murine cremaster laser injury studies showed that HIT antibodies bind predominantly to the EC surface rather than platelet within the thrombus itself. Was this observation related to the nature of the cremaster injury? Would antibody binding to the EC lining also be important in a wholly human HIT detection system? Using the described photochemical microfluidic system, we created a localized injury in human umbilical vein EC-lined channels through which we flowed whole human blood. Activated platelets established growing aggregates at the site of EC injury, releasing more PF4 that then bound to non-activated ECs downstream of the injury. Whole blood containing a HIT-like antibody to simulate the prothrombotic state of HIT was then flowed over this injured vasculature. HIT antibodies and then platelets bound sequentially to this new site of HIT antigen, allowing the thrombus to propagate downstream. We have named this phenomenon "rolling barrage" and suggest that a key part of the prothrombotic nature of HIT lies in antibody-mediated activation of downstream EC with subsequent thrombus propagation. HIT often occurs in the setting in surgery, which might prime EC dysfunction. We therefore treated the ECs (TNF-α) prior to injury and introducing the HIT-like antibody. TNF-α activated the EC lining, leading to loss of the anticoagulant EC surface, which enhanced clot formation downstream of the site of photochemical injury. Therefore, in a prothrombotic state such as HIT, we propose that a local injury acts as a nidus for thrombus initiation. The procoagulant process spreads distally in part because of released PF4 adhering to the downstream EC glycocalyx, which is exacerbated by mediators of inflammation. We anticipate that the described model can be used to study novel interventions to block this cycle in a wholly human system with control over the contribution of individual cellular elements, and will further understanding of the importance of this mechanism in other prothrombotic disorders. Disclosures No relevant conflicts of interest to declare.
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Ahearne-Kroll, Stephen P. "Jesus’s Death as Communal Resurrection in Mark Dornford-May’s 2006 Film Son of Man." Religions 13, no. 7 (July 8, 2022): 635. http://dx.doi.org/10.3390/rel13070635.
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Instead of trying to recreate the ancient life of Jesus, Mark Dornford-May’s film Son of Man depicts many famous scenes from the gospels, reworked to tell the story of Jesus in the fictitious “Kingdom of Judea, Afrika” with the concerns of local and global poverty, violence, and imperialism. Jesus’s life turns when he directly challenges the Judean leadership, and his arrest, torture, and death reinterpret the dynamics of power from first century imperial Rome in brilliantly analogous fashion both for a localized South African setting and for global settings that struggle under violently repressive governments. Jesus’s death stands as the focal point of communal resurrection, inspiring Mary to challenge the oppression perpetrated by those in power. Jesus’s death serves to express the complexities of international injustice in South Africa and other countries in Africa and around the world, to embolden and unite an oppressed community, and to shine a light on a mother as the leader of this resurrected community.
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Fonda, Marc. "On the Origins and Spread of Pan-Indian Spirituality in Canada." Studies in Religion/Sciences Religieuses 45, no. 3 (August 17, 2016): 309–34. http://dx.doi.org/10.1177/0008429816657741.
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Since the 1960s, often in an urban setting and alongside the Friendship Centre movement, emerged a form of pan-Indian spirituality often used to connect urban Aboriginal people living far from their home communities and provide a safe cultural meeting place, a harbour for political protest, and an opportunity to embark on healing journeys. This paper will provide an introduction into some of the characteristics of pan-Indian spirituality mainly as expressed through the Healing Movement in particular, the social contexts in which it is emerging, and its national and international reach. The example of the Healing Movement, I argue, demonstrates the complexities of pan-Indian Spirituality, since it is developing through an interplay with localized Indigenous traditions and increasing levels of cross-tribal cultural and spiritual sharing, the encounter of Anglo-European and Indigenous cultures in the development of an ideology of pan-Indian spirituality, and the opportunities and challenges of the significant urbanized nature of Canadian First Nations’ lives.
Dissertations / Theses on the topic "Localized complexities"
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Philips, Petra Camilla, and petra philips@gmail com. "Data-Dependent Analysis of Learning Algorithms." The Australian National University. Research School of Information Sciences and Engineering, 2005. http://thesis.anu.edu.au./public/adt-ANU20050901.204523.
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This thesis studies the generalization ability of machine learning algorithms in a statistical setting. It focuses on the data-dependent analysis of the generalization performance of learning algorithms in order to make full use of the potential of the actual training sample from which these algorithms learn.¶
First, we propose an extension of the standard framework for the derivation of
generalization bounds for algorithms taking their hypotheses from random classes of functions. This approach is motivated by the fact that the function produced by a learning algorithm based on a random sample of data depends on this sample and is therefore a random function. Such an approach avoids the detour of the worst-case uniform bounds as done in the standard approach. We show that the mechanism which allows one to obtain generalization bounds for random classes in our framework is based on a “small complexity” of certain random coordinate
projections. We demonstrate how this notion of complexity relates to learnability
and how one can explore geometric properties of these projections in order to derive estimates of rates of convergence and good confidence interval estimates for the expected risk. We then demonstrate the generality of our new approach by presenting a range of examples, among them the algorithm-dependent compression schemes and the data-dependent luckiness
frameworks, which fall into our random subclass framework.¶
Second, we study in more detail generalization bounds for a specific algorithm which is of central importance in learning theory, namely the Empirical Risk Minimization algorithm (ERM). Recent results show that one can significantly improve the high-probability estimates for the convergence rates for empirical minimizers by a direct analysis of the ERM algorithm.
These results are based on a new localized notion of complexity of subsets of hypothesis functions with identical expected errors and are therefore dependent on the underlying unknown distribution. We investigate the extent to which one can estimate these high-probability convergence rates in a data-dependent manner. We provide an algorithm which computes a data-dependent upper bound for the expected error of empirical minimizers in terms of the “complexity” of data-dependent local subsets. These subsets are sets of functions of empirical errors of a given range and can be
determined based solely on empirical data.
We then show that recent direct estimates, which are essentially sharp estimates on the high-probability convergence rate for the ERM algorithm, can not be recovered universally from empirical data.
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Philips, Petra. "Data-Dependent Analysis of Learning Algorithms." Phd thesis, 2005. http://hdl.handle.net/1885/47998.
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This thesis studies the generalization ability of machine learning algorithms in a statistical setting. It focuses on the data-dependent analysis of the generalization performance of learning algorithms in order to make full use of the potential of the actual training sample from which these algorithms learn.¶ First, we propose an extension of the standard framework for the derivation of generalization bounds for algorithms taking their hypotheses from random classes of functions. ... ¶ Second, we study in more detail generalization bounds for a specific algorithm which is of central importance in learning theory, namely the Empirical Risk Minimization algorithm (ERM). ...
Books on the topic "Localized complexities"
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MacLean, Allan B. Vulval pain. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780198749547.003.0009.
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Vulval pain or pain involving the vulval tissue is discussed in Chapter 9. It becomes chronic when lasting for at least three months. Vulvodynia is a subset of chronic vulval pain, once known causes (infective, inflammatory, neoplastic, neurological, traumatic, iatrogenic and hormone deficiencies) are excluded. It reportedly affects one in six women at some stage of their lives. Uncertain terminology has hampered understanding. Even the latest classification from the International Society for the Study of Vulvovaginal Disease has deficiencies but it allows the discarding of previously used unhelpful terms. Differentiating features between provoked (entry dyspareunia), and unprovoked, localised and generalised, overlap, both in diagnosis and management. Older theories on causation included infection, irritation and inflammation but laboratory-based research has not supported these. Hormonal and neural mechanisms seem more likely to cause the pain, while the interplay of biological, psychological, and social factors has recently gained credence. Publications on successful management demonstrate a powerful placebo effect. The role of specially designated vulval pain clinics, multidisciplinary approaches, and team working is emphasised. General measures in vulval care, such as wearing clothes made of natural fibre, using emollients or carrying out pelvic floor exercises besides reducing stress, can minimise the pain. Topical anaesthetic creams or systemic treatments with antidepressants or anti-epileptics have advocates. Treatment is most effective when careful selection, adequate counselling, and ongoing psychosomatic evaluation address all the interactive factors that initiate, and maintain vulval pain besides modulating patient response. Case scenarios illustrate the complexities of diagnosis and management.
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Phillimore, Jenny, Nando Sigona, and Katherine Tonkiss, eds. Superdiversity, Policy and Governance in Europe. Policy Press, 2020. http://dx.doi.org/10.1332/policypress/9781447352051.001.0001.
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Immigration has transformed the social, economic, political and cultural landscapes of global cities such as London, Melbourne, Milan and Amsterdam. The term 'superdiversity' captures a new era of migration-driven demographic diversifications and associated complexities. Superdiversity is the future or, in many cases, the current reality of neighbourhoods, cities, countries and regions, yet the implications of superdiversification for governance and policy have, until now, received very little attention. This book explores the ways in which superdiversity has shaped the development of policy and considers challenges for the future. It begins with an overview of superdiversity. Patterns of migration to high-income countries until the 1990s mainly consisted of many migrants coming from a few countries to a small number of places. Around the turn of the 1990s, a new pattern of migration and associated diversification was observed. Since its inception, the concept of 'superdiversity' was meant to move beyond an observation of ethnic and national diversity, to capture the multidimensional aspect of the processes of diversification driven by new migration. The book critically assesses an 'intercultural policy turn' evident in many European cities, and then examines whether governance mainstreaming forms a suitable policy response to situations of superdiversity. It moves on to assess transmigration and how local urban governance has come to incorporate migration-driven superdiversity in policies. The book concludes with an assessment of how the urban setting conditions emerging us/them distinctions at the neighbourhood level. The analysis involves paying particular attention to the nature and make-up of backlash narratives, as these essentially represent localised responses to changing power dynamics and resource allocations.
Book chapters on the topic "Localized complexities"
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Bartlett, Peter L., Olivier Bousquet, and Shahar Mendelson. "Localized Rademacher Complexities." In Lecture Notes in Computer Science, 44–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/3-540-45435-7_4.
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Downing, Michael. "Visceral pain." In Palliative Medicine: A Case-Based Manual, 31–41. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198837008.003.0004.
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Virtually every person will experience abdominal pain at some point. Although symptoms of pain are often vague and entwined with emotional overtones, careful assessment, combined with knowledge of the relationship of embryology and pain characteristics, will be most helpful to the clinician in diagnosing and using optimal mechanism-based treatment. Some pains are localized, and others ‘referred’; some pains are acute and potentially lethal, while others are chronic and ‘miserable’. ‘Total pain’ components such as worry, anger or depression always accompany and may exacerbate the severity of actual physical pain etiology. This chapter focuses particularly on the understanding the complexities and assessment of pain to enhance clinical acumen, leading to best practice management.
Conference papers on the topic "Localized complexities"
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Hadzantonis, Michael. "Eastern Girls and Boys: Mapping Lesbian and Gay Languages in Kuala Lumpur." In GLOCAL Conference on Asian Linguistic Anthropology 2019. The GLOCAL Unit, SOAS University of London, 2019. http://dx.doi.org/10.47298/cala2019.1-3.
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Lesbian and gay communities in Kuala Lumpur, Malaysia, evidence unique and highly localized language practices, influenced by the specific organization and appropriation of a variety of social and cultural factors and networks. A hybridity and restylizing of Islamic, Confucianist, neoliberal, and transnational discourses significantly shape these communities, thus providing a lens through which to effect description of these speech communities. This paper discusses language styles in lesbian and gay communities in Kuala Lumpur, and evidences that their language practices, language ideologies, and identities, are fostered and legitimized in culturally complex ways. These complexities become predicated on a specific reapropriation of transnational factors, sociocultural histories, and patriarchal standpoints, mediated by society at large. As such, the study explores and finds a significant bias across these two communities, in that the language practices specific to gay communities far exceed those of lesbian communities. These language practices are mediated by gendered practices and gendered differentials pervasive of larger Malaysian society.
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Li, Chen, Jiadao Lin, and Cetin Cetinkaya. "Transfer Matrix Formulation With Optical Penetration for Axisymmetric Thermoelastic Wave Propagation in Films." In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/nde-25808.
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Abstract Using Laplace and Hankel integral transforms in time and the radial coordinate, a fully-coupled thermoelastic formulation based on the equation of motion and heat equation is developed to study the effects of axial optical penetration on axisymmetric wave propagation in thermoelastic layers and/or layered structures. It is demonstrated that the optical penetration has no effect on the entries of the sextic transfer matrix, however it introduces an equivalent forcing term for all state variables for both surfaces of a thermoelastic layer as opposed to the surface heating case in which the heating effect is localized in the heating volume (the thermal skin). The thickness of thermal skin depends on the light intensity modulation frequency while the optical penetration typically depends only on the wavelength of the light. This additional forcing vector is a function of the light intensity modulation frequency, the radial wave number, penetration decay rate, as well as thermoelastic material properties. Complexities in wavefields due to the nature of the forcing term are demonstrated and discussed. A thin copper layer with hypothetical penetration properties is considered for the demonstration of the current formulation.
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Zeng, Jun. "Electrohydrodynamic Modeling for Microfluidic Devices." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-10634.
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Since the inception of microfluidics, the electric force has been exploited as one of the leading mechanisms for driving and controlling the movement of the operating fluid (electrohydrodynamics) and the charged suspensions (electrokinetics). Electric force has an intrinsic advantage in miniaturized devices. Because the electrodes are placed cross a small distance, from sub-millimeter to a few microns, a very high electric field is rather easy to obtain. The electric force can be highly localized with its strength rapidly decaying away from the peak. This makes the electric force an ideal candidate for spatial precision control. The geometry and placement of the electrodes can be used to design electric fields of varying distributions, which can be readily realized by MEMS fabrication methods. In this paper we examine several electrically driven liquid handling operations. We discuss the theoretical treatment and related numerical methods. Modeling and simulations are used to unveil the associated electrohydrodynamic phenomena. The modeling based investigation is interwoven with examples of microfluidic devices to illustrate the applications. This paper focuses on detailed physical simulations of component-level operations. Since the components must be integrated to form a functional system in order to provide desired services, system-level complexities in both architecture and execution also need to be addressed. Compared to the state of the art of computer-aided design for microelectronics, the modeling aid for microfluidics systems design and integration is far less mature and presents a significant challenge, thus an opportunity for the microfluidics research community.
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Samuel, Elvy Jose, Mohd Shah Redza Hanif, Muhd Syaiful Azman Mustapa, Merza Media Adeyosfi, Moet Moet Lwin, Samie Sok Foon Lee, Pascal Millot, and Fui Kent Wong. "Advance Nuclear Magnetic Resonance and Image Logs Application for Predicting Particle Sand Distribution." In IADC/SPE Asia Pacific Drilling Technology Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/209912-ms.
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Abstract The complexities of designing an effective sand control for unconsolidated gas reservoirs in a deepwater environment is exacerbated when the targeted formation sands are characterized by particle size distributions with poorly sorted and non uniform coeficients, and high fine concentrations. Managing these intricacies requires comprehensive sand retention studies developed to ascertain the effectiveness of the sand control performance of gravel and screen gauge opening combinations in the presence of selected formation sand ratios. To build a representative testing program, actual core samples from the targeted studied zones are desirable. However, for economical, technical or logistic contrains the availability of these cores is not always feasible. This paper covers a workflow to determine a synthetic Particle Size Distribution (PSD) of a targeted well in a development block where no core data is available. The data feeding the workflow is derived from wireline bore hole imagers and Non-Magnetic Resonance (NMR) logs obtained from six wells drilled in the exploration phase of the studied gas block. Results are calibrated with localized PSD from available side wall cores. Furthermore, data obtained from the process is used to interrogate sand retention testing Mastercurves built with formation samples from one of the fields in the studied block (Field I). The interrogation process takes the synthetic PSD from the targeted well and creates normalized formation testing ratios which are then compared to the results documented on the sand retention Mastercurves. This paper is intends to discuss the worklflow and results of its field application.
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Aderemi, Samuel, Husain Ali Al Lawati, Mansura Khalfan Al Rawahy, Hassan Kolivand, Manish Kumar Singh, Christophe Darous, and Francois Bouchet. "Full-Field History-Matching of Commingling Stacked Reservoirs: A Case Study of an Oman Southern Asset." In SPE Middle East Oil & Gas Show and Conference. SPE, 2021. http://dx.doi.org/10.2118/204575-ms.
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Abstract This paper presents an innovative and practical workflow framework implemented in an Oman southern asset. The asset consists of three isolated accumulations or fields or structures that differ in rock and fluid properties. Each structure has multiple stacked members of Gharif and Alkhlata formations. Oil production started in 1986, with more than 60 commingling wells. The accumulations are not only structurally and stratigraphically complicated but also dynamically complex with numerous input uncertainties. It was impossible to assist the history matching process using a modern optimization-based technique due to the structural complexities of the reservoirs and magnitudes of the uncertain parameters. A structured history-matching approach, Stratigraphic Method (SM), was adopted and guided by suitable subsurface physics by adjusting multi-uncertain parameters simultaneously within the uncertainty envelope to mimic the model response. An essential step in this method is the preliminary analysis, which involved integrating various geological and engineering data to understand the reservoir behavior and the physics controlling the reservoir dynamics. The first step in history-matching these models was to adjust the critical water saturation to correct the numerical water production by honoring the capillary-gravity equilibrium and reservoir fluid flow dynamics. The significance of adjusting the critical water saturation before modifying other parameters and the causes of this numerical water production is discussed. Subsequently, the other major uncertain parameters were identified and modified, while a localized adjustment was avoided except in two wells. This local change was guided by a streamlined technique to ensure minimal model modification and retain geological realism. Overall, acceptable model calibration results were achieved. The history-matching framework's novelty is how the numerical water production was controlled above the transition zone and how the reservoir dynamics were understood from the limited data.
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Phukan, Madhujya L., Saad A. Siddiqi, Shamma Alshehyari, Bashar Mansour, Maryam Alshehhi, Ashis Shashanka, and Hu Guangcheng. "Sedimentology and Diagenesis and Their influence on the Reservoir Quality: A Case Study of the Late Cenomanian Mishrif Formation, Western Region, Abu Dhabi." In ADIPEC. SPE, 2022. http://dx.doi.org/10.2118/211593-ms.
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Abstract The Cenomanian-early Turonian Mishrif Formation is an important reservoir rock throughout the Middle East. Although extensive studies have been carried out on the Mishrif Formation across the Middle East, very limited information is available about the Mishrif Formation from the western region of Abu Dhabi. The primary objective of this study is to review the sedimentology of the Mishrif Formation in the oilfields of the western region of Abu Dhabi and to define the petrology, the depositional and diagenetic history, and the reservoir quality. The Mishrif Formation is sedimentologically characterized using an industry-standard lithofacies classification scheme. Subsequent sedimentological interpretations define the depositional evolution of the sediments. Petrologic assessment highlights the depositional texture and successive diagenetic alterations that have affected the sediments, thereby modifying the reservoir properties. The Mishrif sediments represent deposition on a carbonate ramp system modified by a potential barrier shoal, along with localized relief developing shoal-like geobodies. A broad range of lithofacies represent the range from wackestone to boundstones, with the sediments interpreted to represent deposition in a shoal complex through backshoal and rudist buildups to a distal mid-ramp to an outer ramp setting. A petrographic study reveals multiple diagenetic phases have affected the sediments. Porosity is enhanced considerably due to multiple leaching phases, which are followed by subsequent cementing phases comprised of calcite and dolomite that degrades the porosity in places. Fracture events do not seem to have any significant impact towards enhancing the reservoir properties as they remain dominantly filled by cements but locally, a few fractures, which are open, contribute to enhancing the connectivity. A moderate to very good reservoir quality is inferred for the sediments of the Mishrif Formation. The porosity values range between 7% to 34% and permeability values from 0.06mD to >10 D. Interrogation of the core analysis data indicates a depositional control along with a diagenetic influence on the reservoir quality. This study helps to resolve the complexities associated with the sedimentological makeup and diagenesis of the Mishrif Formation in the western region of Abu Dhabi. The understanding from this study will help in further works related to reservoir geomodelling and pattern prediction, which may also be extrapolated to uncored intervals for representativeness and regional correlation of the Mishrif Formation.
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Yao, Jianfeng, Xiang Li, Kai Zhao, and Hui Zhang. "Full-Waveform Inversion and Least-Squares Migration to Improve Images in Northern Carnarvon Basin." In International Petroleum Technology Conference. IPTC, 2021. http://dx.doi.org/10.2523/iptc-21292-ms.
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Abstract Northern Carnarvon Basin is located in North West Shelf of Western Australia. The basin has over 10km sediments and owns both oil-prone and gas-prone sediments and is the current largest oil and gas producing basin in Australia. A geological section through this basin is shown in Figure 1, the complex geological settings from shallow to deep leads to significant processing challenges. In the vintage processing, the seismic image at reservoir level is deteriorated due to the presence of following geological complexities: 1) rugose water bottom, 2) shallow frequent canyons or channel systems, 3) shallow spatial-variant Tertiary carbonates, and 4) shallow gas chimneys and other geo-bodies. These complex overburdens plus limited small-angle coverage of primary reflections from narrow azimuth (NAZ) streamer surveys make it very difficult for ray-based reflection tomography to resolve the shallow velocity. As a result, the target image suffers from large well mis-ties, low signal-to-noise ratio (S/N) and severe event undulations. In addition, shallow fast-velocity layers cause severe illumination issues for deep targets which are compounded by limited offsets of NAZ surveys. Furthermore, localised absorption effects from gas pockets lead to dimming amplitudes for events beneath them. To deal with these issues, we propose to use time-lag full wave-form inversion (TLFWI) to resolve the velocity of complex overburdens and least-squares Q prestack depth migration (LS Q-PSDM) to compensate for illumination issues and absorption effects for the latest reprocessing. In the following sections, application procedure and results of these two technologies will be discussed. Seismic inversion was also conducted to assist the processing and analysis of the final result.