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A.E. Kontorovich L.G. Vakulenko V.A. Kazanenkov M.B. Skvortsov P.A. Yan V.V. Bykov A.Yu. Popov L.S. Saenko 《Russian Geology and Geophysics》2010,51(2):147-158
This study provides a comprehensive sedimentologic analysis of the J2 prospective horizon (Middle–Late Bathonian) in the central West Siberian Basin. Based on the extensive dataset, it was established that structural complexity of this horizon is largely caused by a variety of depositional environments. Sedimentary facies of this horizon pass upward from widespread continental at the base, through deltaic or coastal-continental, to marginal-marine at the top. Change in the paleohypsometry of the study area reflects the distribution of depositional environments, in terms of the proportions of continental, transitional, and marine deposits. The study also shows that facies variability and change in depositional settings can have a significant control on reservoir quality, as well as its vertical and lateral distribution. Using a combination of detailed GDE reconstructions, structure contour mapping on the top and base of the J2 horizon, analyses of well test data, probability of reservoir presence, distribution of average porosity and permeability within different subenvironments, a composite map showing variations in the reservoir effectiveness in the J2 horizon was generated. 相似文献
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The study analyzes the recently summarized data on surface air temperature in the east of North America, in Western and Eastern Europe, and in India before and after the Tambora volcano eruption occurred in Indonesia in 1815. The well-known fact is proved that no cooling occurred after the Tambora eruption in the east of Europe and in India. It is found that the insignificant (at the decadal timescale) cooling was observed in all analyzed regions: it started earlier than the Tambora eruption and than the stronger eruption of another volcano in 1809. The paper demonstrates that it is impossible to reveal cause-effect relations between the general cooling and the eruption of the above volcanoes based on the available data on surface air temperature. Cold snaps that follow the later volcanic eruptions were identified by meteorologists using the data of the whole network of meteorological observations established in the second half of the 19th century. However, these cold snaps cannot be detected using data on surface air temperature only. 相似文献
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L.G. Vakulenko T.P. Aksenova I.S. Yeltsov A.G. Zamirailova P.A. Yan 《Russian Geology and Geophysics》2010,51(4):329-338
We have studied Jurassic sections in the Predyenisei subprovince of the West Siberian petroleum basin, which were penetrated in the Vostok-1, Vostok-3, and Vostok-4 stratigraphic wells. The Urman, Togur, Ilan, Peshkovo, Tyumen’, Naunak, and Mar’yanovka Formations are described from a detailed comprehensive core analysis and log data. The depositional environment for these sediments was predominantly continental. There is evidence for short transgressions in the Ilan (Lower Toarcian) and Peshkovo (Upper Toarcian) Formations, as well as the Upper Urman (Upper Pliensbachian) and the Upper Tyumen’ (Bajocian) Subformations. In the Upper Naunak Subformation (Oxfordian), there was a change of facies from continental to littoral continental and littoral marine. The Mar’yanovka Formation developed in normal marine shallow- or moderately deep-water environments. Although good reservoirs are common throughout the Jurassic section in the southeast of West Siberia, only small, lithologically screened deposits are predicted here. 相似文献
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Oceanology - It is generally accepted that changes in the heat content of the North Atlantic can be a source of some surprises in the present-day climate evolution, especially in Europe. The RAPID... 相似文献
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The prevailing heat transfer processes—convection in the photosphere and wave propagation in the chromosphere—are principally different. Despite this fact, there is a direct link between these processes: it is precisely convective photospheric flows that excite intense Alfven waves in the chromosphere. A physical model explaining the effect of strong chromospheric and coronal heating is improved in this work. The model is based on synchronous propagation and interaction in the chromosphere of photospheric spicules and Alfven waves. The results of observations of the last decade and the analytical solution of the equations of magnetohydrodynamics are used. It is established that the heating of the solar atmospheric plasma proceeds not in the corona but in the upper chromosphere. 相似文献