Application of facies-based rock-physics inversion in the appraisal of the Cragganmore gas discovery, West of Shetland

2019 ◽  
Vol 38 (10) ◽  
pp. 780-785
Author(s):  
Chris Purcell ◽  
Jack Hoyes
Keyword(s):  
United Kingdom ◽  
Seismic Data ◽  
Rock Physics ◽  
The West ◽  
Data Set ◽  
Well Control ◽  
The United Kingdom

Facies-based rock-physics inversion is a tool that is generally employed in data-rich areas. It also can be useful in areas with little well control. This method was used to investigate the Cragganmore discovery in the West of Shetland in the United Kingdom. By utilizing wells outside of the seismic data set, a better-informed inversion can be created that can assist in future appraisal programs.

The Covid-19 lockdown in the United Kingdom and subjective well-being: Have the self-employed suffered more due to hours and income reductions?

2021 ◽  
pp. 026624262098676 ◽  
Author(s):  
Wei Yue ◽  
Marc Cowling
Keyword(s):  
United Kingdom ◽  
Rare Events ◽  
Well Being ◽  
The Self ◽  
Subjective Well Being ◽  
Data Set ◽  
The United Kingdom ◽  
Hours Of Work ◽  
Period Data ◽  
The Uk

It is well documented that the self-employed experience higher levels of happiness than waged employees even when their incomes are lower. Given the UK government’s asymmetric treatment of waged workers and the self-employed, we use a unique Covid-19 period data set which covers the months leading up to the March lockdown and the months just after to assess three aspects of the Covid-19 crisis on the self-employed: hours of work reductions, the associated income reductions and the effects of both on subjective well-being. Our findings show the large and disproportionate reductions in hours and income for the self-employed directly contributed to a deterioration in their levels of subjective well-being compared to waged workers. It appears that their resilience was broken when faced with the reality of dealing with rare events, particularly when the UK welfare support response was asymmetric and favouring waged employees.

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.

Bass nurseries on the west coast of the U.K.

1986 ◽  
Vol 66 (2) ◽  
pp. 439-464 ◽  
Author(s):  
Donovan Kelley
Keyword(s):  
United Kingdom ◽  
West Coast ◽  
Dicentrarchus Labrax ◽  
The South ◽  
The West ◽  
The United Kingdom

INTRODUCTIONPresence of O-group bass, Dicentrarchus labrax (L.), has been recorded for a number of estuaries and tidal backwaters in the south of the United Kingdom, including the tidal Thames (Wheeler, 1979), the outer Thames at Southend (Murie, 1903), the Medway (Van den Broek, 1979), Langstone Harbour (Reay, 1973), the Dart (Dando & Demir, 1985), and the Tamar (Hartley, 1940). The author has found them, additionally, in Chichester Harbour and in the Cuckmere (Sussex), Teign and Tavy estuaries. Correspondents have reported them from the estuaries of the Blackwater (Cox), Crouch (Wiggins), Lynher (Gee) and Fal (Melhuish); also from the Fleet backwater in Dorset (Fear). It may be inferred that all estuaries and tidal backwaters on the south and south-east coasts of the U.K. constitute bass nurseries, in some degree.*

Common-focus point-based target-oriented imaging approach for continuous seismic reservoir monitoring

Geophysics ◽  
2018 ◽  
Vol 83 (4) ◽  
pp. M41-M48 ◽  
Author(s):  
Hongwei Liu ◽  
Mustafa Naser Al-Ali
Keyword(s):  
Seismic Data ◽  
Rock Physics ◽  
Time Lapse ◽  
Velocity Estimation ◽  
Estimation Methods ◽  
Data Sets ◽  
Data Set ◽  
Velocity Models ◽  
Reservoir Monitoring ◽  
Focus Point

The ideal approach for continuous reservoir monitoring allows generation of fast and accurate images to cope with the massive data sets acquired for such a task. Conventionally, rigorous depth-oriented velocity-estimation methods are performed to produce sufficiently accurate velocity models. Unlike the traditional way, the target-oriented imaging technology based on the common-focus point (CFP) theory can be an alternative for continuous reservoir monitoring. The solution is based on a robust data-driven iterative operator updating strategy without deriving a detailed velocity model. The same focusing operator is applied on successive 3D seismic data sets for the first time to generate efficient and accurate 4D target-oriented seismic stacked images from time-lapse field seismic data sets acquired in a [Formula: see text] injection project in Saudi Arabia. Using the focusing operator, target-oriented prestack angle domain common-image gathers (ADCIGs) could be derived to perform amplitude-versus-angle analysis. To preserve the amplitude information in the ADCIGs, an amplitude-balancing factor is applied by embedding a synthetic data set using the real acquisition geometry to remove the geometry imprint artifact. Applying the CFP-based target-oriented imaging to time-lapse data sets revealed changes at the reservoir level in the poststack and prestack time-lapse signals, which is consistent with the [Formula: see text] injection history and rock physics.

Humans and Monsters

2021 ◽  
pp. 141-180
Author(s):  
Allan T. Moore
Keyword(s):  
United Kingdom ◽  
Case Studies ◽  
Violent Crime ◽  
The West ◽  
Mass Violence ◽  
The United Kingdom ◽  
Media Portrayal ◽  
Large Populations ◽  
Mainstream Society ◽  
The Uk

Crime, and in particular violent crime, is a frequent source of media interest both in the form of factual reporting and fictional portrayal. As explained through an analysis of academic and theoretical literature, media representation has the potential to influence large populations and shape the opinions that mainstream society hold related to the perpetrators of such crimes. Case studies examining the CONTEST counterterrorism strategy in the United Kingdom and the failure of the UK Government to implement this strategy in the manner intended, and strategies for demobilization of perpetrators of genocide in Rwanda are outlined in detail. The case studies are then considered together in terms of how they align with what the underpinning theory argues. Overall conclusions are drawn that success and failure of strategies for reintegration of perpetrators of mass violence are dependent on a combination of state buy-in and destruction of the ‘monster' narrative associated with fictional and factual media portrayal of perpetrators in the West in particular.

How to Qualify for Cabinet

2019 ◽  
pp. 155-180
Author(s):  
Claire Annesley ◽  
Karen Beckwith ◽  
Susan Franceschet
Keyword(s):  
United States ◽  
United Kingdom ◽  
Race And Ethnicity ◽  
The United States ◽  
Data Set ◽  
Demographic Group ◽  
The United Kingdom

Chapter 7 shows that aspirant ministers can qualify for cabinet appointment by meeting representational criteria, defined as membership in a politically relevant political, territorial, or socio-demographic group deemed important for legitimizing the cabinet team. In all country cases, a subset of ministrables qualify for appointment to cabinet on the basis of representational criteria, and all countries in the book’s data set employ representational criteria in defining the ministerial eligibility pool, even as specific representational criteria vary in number and content across cases. The chapter shows that regional representation is a strong prescriptive criterion in five countries (Australia, Canada, Germany, Spain, and the United Kingdom), and that race and ethnicity are prescribed as representational categories in Canada and the United States. The chapter finds that gender is the only representational category that appears across all countries, yet the magnitude of women’s inclusion varies significantly.

Observations on Cholera,

1854 ◽  
Vol 1 (8) ◽  
pp. 115-125
Author(s):  
Robt. Boyd
Keyword(s):  
United Kingdom ◽  
Public Institutions ◽  
Frequent Occurrence ◽  
Annual Reports ◽  
The West ◽  
The United Kingdom ◽  
Lunatic Asylums ◽  
Different Parts

“He came, he went, like the simoon, That harbinger of fate and gloom, Beneath whose widely-wasting breath, The very cypress droops to death.’'—Byron.The frequent occurrence of Cholera, in different parts of the United Kingdom, of late years, and its prevalence at present, secms to point out the necessity of our being prepared for its appearance, particularly in public institutions, and amongst others, Lunatic Asylums, which in some instances have suffered severely from this disease. In the West Riding of York Asylum, containing 633 patients, 98 are reported to have died from cholera in the autumn of 1849. The private asylums for pauper lunatics generally about London and in some other places, suffered more or less from the same epidemic; whether from cholera or some other cause, the mortality in the Lancaster Asylum was unusually high, 48 per cent in 1833, according to “a table of patients admitted, &c,” in the annual reports of that institution.

Improving seismic QP estimation using rock-physics constraints

Geophysics ◽  
2018 ◽  
Vol 83 (3) ◽  
pp. MR187-MR198 ◽  
Author(s):  
Yi Shen ◽  
Jack Dvorkin ◽  
Yunyue Li
Keyword(s):  
Seismic Data ◽  
Closed Form Solution ◽  
Rock Physics ◽  
Seismic Inversion ◽  
Analytical Relation ◽  
Gas Reservoir ◽  
Seismic Section ◽  
Data Set ◽  
Attenuation Model ◽  
Text Model

Our goal is to accurately estimate attenuation from seismic data using model regularization in the seismic inversion workflow. One way to achieve this goal is by finding an analytical relation linking [Formula: see text] to [Formula: see text]. We derive an approximate closed-form solution relating [Formula: see text] to [Formula: see text] using rock-physics modeling. This relation is tested on well data from a clean clastic gas reservoir, of which the [Formula: see text] values are computed from the log data. Next, we create a 2D synthetic gas-reservoir section populated with [Formula: see text] and [Formula: see text] and generate respective synthetic seismograms. Now, the goal is to invert this synthetic seismic section for [Formula: see text]. If we use standard seismic inversion based solely on seismic data, the inverted attenuation model has low resolution and incorrect positioning, and it is distorted. However, adding our relation between velocity and attenuation, we obtain an attenuation model very close to the original section. This method is tested on a 2D field seismic data set from Gulf of Mexico. The resulting [Formula: see text] model matches the geologic shape of an absorption body interpreted from the seismic section. Using this [Formula: see text] model in seismic migration, we make the seismic events below the high-absorption layer clearly visible, with improved frequency content and coherency of the events.

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