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7th Congress of the Balkan Geophysical Society
- Conference date: 07 Oct 2013 - 10 Oct 2013
- Location: Tirana, Albania
- ISBN: 978-90-73834-55-2
- Published: 07 October 2013
101 - 110 of 110 results
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GPR through a Water Mirror Defining the Topography of a Bottom and the Depth of the Sediments beneath the Water Layer
Authors Ch. Tzankov and E. DemirevaDecline in economic activity in the field of investment planning and construction in the Republic of Bulgaria requires designers and builders to consider the impact of suspension of construction from an economic and engineering point of view. At what stage losses can be minimized and until what point will the suspended construction not lead to an emergency situation, both in terms of the building and the neighbors? Investment interests of a new owner require the study of the earth foundation beneath the water aggregated in the excavation. The possibility for drainage and the amount of additional measures necessary for the fortification of the dip depend on the power of the sediment layer. Last but not least, the fortification of the base determines the safety of the future building related to earthquake impact and subsidence deformations. This experiment is a pioneer georadar study through a water mirror for the purposes of construction activities in Bulgaria.
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Determining the Evolution of Fissure-ridge Travertine with GPR Method - A Case Study in Pamukkale, Western Turkey
Authors C.C. Yalçiner, E. Altunel, Y.C. Kurban, M.İ. Topçu and A. BüyüksaraçThe purpose of this paper is to investigate the subsurface geometry and internal structures of a fissure-ridge travertine in Pamukkale, western Turkey, using GPR. The ridge was scanned in detail using GPR, and its subsurface geometry was modelled in three dimensions (3D). Illustration of the subsurface layout of fissure-ridge travertine would contribute to understanding the evolution of the ridge along the fissure; and further the understanding of near-surface fracture mechanics in the upper crust.
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The Analysis of Hole-to-hole and Surface-to-hole Signal Contribution Sectios
Authors C. Demirel and M.E. CandansayarThe surface measurements cannot found small size targets and thin layer which are buried very deep. However, these targets can be found by hole-to-hole and surface-to-borehole measurements. In this study, comparison of two (pole-pole), three (pol-bipol, bipol-pol) and four (bipol-bipol, pol-Tripol) electrode array's signal contribution sections.In addition, we investigated that ratio of distance between holes and hole length.
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New Bathymetric (Marine Seismic) Survey Results of North Anatolien Fault System in Marmara Sea Turkey
By M. ŞenözExtended Abstract Submission 18561 Dr.Mehmet Senoz
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Effects of 17 August Earthquake (Mw=7.4) and 12 November Earthquake (Mw; = 7.2) to the Sapanca Lake
More LessAfter the earthquake in 1999- Sapanca lake, precipitation, evaporation, and environmental impacts of the lake water level changes
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Thermal Properties of Carbonate Rocks Cropping Out in Southern Albania
Authors G.F. Andriani, G. Baldassarre, G. Diprizio and G. FiorettiIn this paper a limestone variety belonging to the Butrinti district (Southern Albania) was studied. It is a good quality quarried rock which is utilised for construction and ornamental purposes. Physical and mechanical features were determined in order to classify and evaluate the technical performances of these rocks above all in terms of thermophysical properties.
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Seismic Investigation in Thrust Belts Albania
More LessPetromanas GmbH operates with three license blocks in Albania: Block A&B, in North; D&E in the central and 2&3 the central and South Albania. In the North Albania vibrators used for acquisition, in the Central and South source was Explosive. A big challenge for modern seismic is the ability to image complicated structures. Many efforts done to find best parameters for acquisition and processing. Fold and thrust belts characterized by rapid velocity variations due to juxtaposed rock types. Average velocity maps prepared based mainly on the well data. Generally, when we see a structural image on seismic lines, the next step is to determine where that structure is actually located in time and depth. Grid of 2D seismic lines used for this proposes. Sequences of the seismic investigations include topographic survey, drilling, recording, processing and interpretation. The topographical complexity of the area created difficulties for crew and personnel movements. The high temperatures during July and August and rains in the winter affected the operations. Bad weather on some days impeded helicopter support, causing postponement of crew and equipment movements. The characteristics of the geological formations (rocks of great hardness and resistance) increased the drilling time per shot hole, increasing average times. Briefly, we can describe Petromanas activity in the North, Central and South Albania
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The Evidence of the New Carbonate Structure in Dumre Region as a Result of Geological Nd Geophysical Data Co-ordination
More LessIn this article is provided the structure relationships of Dumre at the surface and in depth with Berat anticline Belt further south. Based on these relationships, is given a perspective of oil-gas bearing in this region. In our view, the seismic data information help decoding of superficial geology, and both together lead to the region's geological interpretation in depth.
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Exploration Opportunities in Albania – A Review of Recent Exploration Activities
By Z. BegaThe article is a review of the exploration opportunities in Albania, by taking into consideration the recent hydrocarbon exploration activities performed by several foreign operators in off-onshore during early 1990’s and early 2000. The analyses of the results have been reviewed into a regional geotectonic framework throughout External Albanides which can be sub-divided into three regions: South region: Mesozoic basinal and platform carbonates are key reservoirs in the area. The majority of traps are deep sub-thrusts but not excluding buried hills in few ‘tectonic windows’. The play is still in its infancy stage although few sub-thrusts proved oil column (Kanina 1) and tested non-commercial oil and gas (Delvina 12, Shpiragu 1). The predominant reservoir porosity is fracturing but also primary porosity is becoming important while approaching the Apulian slope environment. Seismic 2D data are the main drivers of subsurface mapping although in some areas they suffer low S/N ratio; therefore a combination of potential field methods and Landsat data are required. North region:It is consider still frontier, with Mesozoic platform carbonates as key reservoirs. The thin-skinned reservoirs, despite abundant of oil shows, failed to prove hydrocarbon potential mainly due to lack of mature source rocks (SR).Re-evaluation of data shows that inverted Mesozoic platform carbonates sub-thrusts and buried hills are key plays. They are deep seated and resemble the Southern Apennines discoveries in Italy. These reservoirs have overall good primary and fractures porosities. Central region: Tertiary sandstone siliciclastics are key reservoirs in the Durresiforedeep. They are proven as oil and gas plays in a wide range of traps (structural, stratigraphic, combined) and depositional environments (delta tops, slope channels, proximal fans). The onshore exploration has been ceased long time ago because of continuous failure to find more gas through 2D seismic data. No 3D seismic have been acquired so far in onshore Albania, although it is well known that 3D seismic methodology is the only mean to explore for such plays. Two 3D seismiccampaignshave been recorded in offshore Durresiforedeep, but no drilling have been achieved yet based on these data.
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The Use of Gravity Prospecting to Help the Seismic Microzonation Studies of the Leonessa Basin in Rieti, Italy
Authors K. Skrame and M. Di FilippoA research approach that integrated different geophysical methods for local subsoil evaluation using for seismic microzonation studies was carried out in this research paper. The gravity prospecting were made to map and model the thickness of Quaternary deposits (gravel, sand and clay) overlaying the Meso-Cenozoic pelagic basin deposits of the Leonessa basin. The Leonessa basin is one of the major intermontane tectonic depressions of Central Apennines boarded on the southern side by the great normal fault, here referred to as the Leonessa fault. The study involved a test area of 32 km2 occupied by 250 gravity stations. The stations were accurately located with differential GPS (Ashtech Z-Xtreme dual-frequency GPS) that provided centimetric accuracy in elevation. The gravity measurements were performed using a LaCoste & Romberg gravimeter mod. D60 that has a reading resolution and an accuracy of 0.01 mGal. Measurements have been done in the depressions and also over the basement in order to determine the regional anomalies. Various corrections have been considered for calculating the Bouguer anomaly, the Regional gravity and the Residual gravity. On the basis of the Residual gravity, we carried out three 2D gravimetric models. These models have allowed us to reconstruct the arrangement in the depth of the sedimentary top of bedrock, to evaluate the thickness of the Quaternary deposits and to recognize the paleo-morfology arrangement of the basin. The models match quite well with the information determined from well logs and seismic methods. On the basis of gravity anomalies, we reproduced the Structural Geological Map and the 3D Model of the buried morphology of the Leonessa basin. Gravity methods have been used most extensively in the search for oil and gas particularly in the early twentieth century but we think that such methods can be employed very widely in mapping the thickness of unconsolidated deposits, where ground motion amplification can occur.
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