Use of Duplex Wave Migration for Examination of Irregularities in Subsalt Carbonates in the Pre-Caspian Depression

2014 ◽  
Author(s):  
K.O. Iskaziyev ◽  
S.G. Karimov ◽  
N.I. Yasafova ◽  
R.V. Kudаkaev ◽  
E.G. Khabibullin ◽  
...  
Keyword(s):  
Caspian Depression ◽  
Wave Migration

Study of sand wave migration over five years as observed in two windfarm development areas, and the implications for building on moving substrates in the North Sea

2014 ◽  
Vol 105 (4) ◽  
pp. 241-249 ◽  
Author(s):  
Ken P. Games ◽  
David I. Gordon
Keyword(s):  
Case Studies ◽  
Large Scale ◽  
Oil And Gas ◽  
Sand Wave ◽  
Sand Waves ◽  
Migration Rates ◽  
The North ◽  
The North Sea ◽  
Wave Migration ◽  
The Impact

ABSTRACTSand waves are well known indicators of a mobile seabed. What do we expect of these features in terms of migration rates and seabed scour? We discuss these effects on seabed structures, both for the Oil and Gas and the Windfarm Industries, and consider how these impact on turbines and buried cables. Two case studies are presented. The first concerns a windfarm with a five-year gap between the planning survey and a subsequent cable route and environmental assessment survey. This revealed large-scale movements of sand waves, with the displacement of an isolated feature of 155 m in five years. Secondly, another windfarm development involved a re-survey, again over a five-year period, but after the turbines had been installed. This showed movements of sand waves of ∼50 m in five years. Observations of the scour effects on the turbines are discussed. Both sites revealed the presence of barchans. Whilst these have been extensively studied on land, there are few examples of how they behave in the marine environment. The two case studies presented show that mass transport is potentially much greater than expected and that this has implications for choosing turbine locations, the effect of scour, and the impact these sediment movements are likely to have on power cables.

Kirchhoff elastic wave migration for the case of noncoincident source and receiver

Geophysics ◽  
1984 ◽  
Vol 49 (8) ◽  
pp. 1223-1238 ◽  
Author(s):  
John T. Kuo ◽  
Ting‐fan Dai
Keyword(s):  
Elastic Wave ◽  
Seismic Data ◽  
Signal To Noise Ratio ◽  
Horizontal Layer ◽  
P Wave ◽  
Seismic Section ◽  
S Waves ◽  
Surface Data ◽  
Marine Seismic ◽  
Wave Migration

In taking into account both compressional (P) and shear (S) waves, more geologic information can likely be extracted from the seismic data. The presence of shear and converted shear waves in both land and marine seismic data recordings calls for the development of elastic wave‐migration methods. The migration method presently developed consists of simultaneous migration of P- and S-waves for offset seismic data based on the Kirchhoff‐Helmholtz type integrals for elastic waves. A new principle of simultaneously migrating both P- and S-waves is introduced. The present method, named the Kirchhoff elastic wave migration, has been tested using the 2-D synthetic surface data calculated from several elastic models of a dipping layer (including a horizontal layer), a composite dipping and horizontal layer, and two layers over a half‐space. The results of these tests not only assure the feasibility of this migration scheme, but also demonstrate that enhanced images in the migrated sections are well formed. Moreover, the signal‐to‐noise ratio increases in the migrated seismic section by this elastic wave migration, as compared with that using the Kirchhoff acoustic (P-) wave migration alone. This migration scheme has about the same order of sensitivity of migration velocity variations, if [Formula: see text] and [Formula: see text] vary concordantly, to the recovery of the reflector as that of the Kirchhoff acoustic (P-) wave migration. In addition, the sensitivity of image quality to the perturbation of [Formula: see text] has also been tested by varying either [Formula: see text] or [Formula: see text]. For varying [Formula: see text] (with [Formula: see text] fixed), the migrated images are virtually unaffected on the [Formula: see text] depth section while they are affected on the [Formula: see text] depth section. For varying [Formula: see text] (with [Formula: see text] fixed), the migrated images are affected on both the [Formula: see text] and [Formula: see text] depth sections.

Original thickness of salt in the Caspian depression, from geophysical data

1971 ◽  
Vol 13 (3) ◽  
pp. 419-421 ◽  
Author(s):  
M V. Gorfunkel' ◽  
G.L. Slepakova
Keyword(s):  
Geophysical Data ◽  
Caspian Depression

scholarly journals Helminth biodiversity and spread peculiarities of helminthiasis of domestic artiodactyls in the Caspian Depression ecosystems

2021 ◽  
Vol 36 ◽  
pp. 06012
Author(s):  
Agay Ataev ◽  
Madina Zubairova ◽  
Nadyrsultan Karsakov ◽  
Dzhamilya Kataeva ◽  
Arslan Khasaev
Keyword(s):  
Salt Marshes ◽  
Domestic Animal ◽  
Climatic Conditions ◽  
North Caucasus ◽  
Average Temperature ◽  
Rich Variety ◽  
The North ◽  
Domestic Ruminants ◽  
Caspian Depression ◽  
Animal Grazing

The Caspian Depression is situated on the flat eastern territory of the North Caucasus. According to the soil and climatic conditions, different ecosystems are neighboring in the Caspian Depression: lowland moistened areas (up to 30% of the territories), plat steppes (more than 50%), salt marshes (up to 10%), and semi-deserts (up to 10%). The majority of the Caspian Depression territories are used for domestic animal grazing, where more than 3 million sheep, goats and up to 150 thousand heads of cattle are contained. 46 nosological units of helminthiasis agents are parasitized on domestic ruminants, including 37 species of sheep and 38 of cattle. The average temperature in winter is up to +12°С; in summer – up to +45°С (210-220 days a year). This region is characterized by year-round use of land and an increase in zootechnical standards for keeping animals per unit of pasture (up to 8 heads of sheep and 3 heads of cattle). Moreover, it has a rich variety of pathogens of helminthiasis, the similarity of most types of helminths for domestic ruminants, a high number of invasive stages in biotopes, and up to 95% of the prevalence of mixed invasions of dangerous parasitoses.

scholarly journals A new species of the genus Ectromopsis Antoine, 1949 from Turkey (Coleoptera: Tenebrionidae)

2021 ◽  
Vol 113 ◽  
pp. 1-9
Author(s):  
Maxim V. Nabozhenko
Keyword(s):  
New Species ◽  
Body Shape ◽  
The Body ◽  
Central Anatolia ◽  
Key To Species ◽  
Shape Structure ◽  
Caspian Depression ◽  
West Kazakhstan ◽  
A New Species ◽  
Coleoptera Tenebrionidae

Ectromopsis merkli sp. n. (Coleoptera: Tenebrionidae: Helopini) is described from Central Anatolia (coast of Eğirdir Lake). The species is the most similar to E. tantilla Ménétriés, 1848 from the Caspian depression (European Russia, West Kazakhstan) and differs in the body shape, structure of genae, the shape of pronotum and elytral punctation. Brief information about a relic type of distribution, trophic associations and adaptations of Ectromopsis spp. are given, as well as a key to species from the eastern part of the range. With seven figures.

Carbonates in Irrigated Soils of the Caspian Depression

2021 ◽  
Vol 11 (2) ◽  
pp. 193-199
Author(s):  
I. N. Gorokhova ◽  
I. N. Chursin
Keyword(s):  
Caspian Depression ◽  
Irrigated Soils
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