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Register a new userThe effect of layer thickness and reflection coefficient variation on the synthetic seismogram image
تأثير تغير سماكة الطبقة و قيم معامل الانعكاس في صورة السيسموغرام الصنعي
1958
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رفيق جبر( باحث )
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هدف البحث إلى دراسة تأثير تغير السرعة و الكثافة و سماكة الطبقة في صورة المقطع السيزمي ( Hz 20-130 )، و إشارة الرجاج بمجالات ترددية الصنعي باستخدام إشارة ريكر بمجال واسع من الترددات ( Hz 5-170 ) كتقنية شائعة في عمليات التسجيل السيزمي الانعكاسي على اليابسة. حاول الباحث متنوعة بيان العلاقة المتبادلة بين أزمنة تسجيل الإشارة السيزمية و قيم معامل الانعكاس من جهة، و أزمنة التسجيل و تغير سماكة الطبقة الصخرية من جهة ثانية، و تبين كما هو معروف أن أزمنة الورود المسجلة تتناسب طرداً مع ازدياد سماكة الطبقة، و لكنها تخضع لتأخير زمني و بعلاقة شبه أسية عند تغير السرعة و الكثافة (معامل الانعكاس) ضمن الطبقة الواحدة. طُبق أسلوب جديد في تمثيل البيانات الناتجة باستخدام باستخدام نظام المعلومات (Raster Images) تقنية تحويل المقاطع السيزمية الزمنية إلى صيغة صور الأمر الذي مكّن من التحكم بالمقاييس اللونية المعبرة عن سعة الإشارات السيزمية، GIS الجغرافي المسجلة و تتبع العواكس و الحصول على معلومات مهمة عن سعة الإشارة حتى لو انخفضت سماكة الطبقة إلى أقل من الطول الموجي بعشر مرات، و ذلك في حال استخدام إشارة ريكر أو إشارة الرجاج على حد سواء.
The article aims to study the effect of layer thickness and reflection coefficient variation on the image of synthetic seismogram, which is generated by using Ricker Wavelet with wide range of frequencies (20-130Hz) and Vibrator Sweeps with many frequencies ranges (5-170Hz) as a known technique in reflection seismic method on land. The Researcher tried to determine the relationship between signals recording times and reflection coefficients variation from first side, and recording times with layer thickness variation from second side. The result which is observed that; the recorded times increased proportionally with increasing of the layer thickness (as we know), but it is delayed with exponential relation when the velocity and density are varied within the same layer. New manner is applied to represent the result by using the conversion of time seismic section to raster images by using GIS, this way gave us ability to control the colored scale which reflects the amplitude of recorded signals, and follows the reflectors or get important information about signals amplitude even though the layer thickness is decreased less than wavelet length ten times if we used Ricker signal or Vibration Sweeps.
References used
Bagaini C., Tim B., Adel El-Emam, Andreas Laake, 2010. Land Seismic Techniques for high-quality Data, Oilfield review Summer 2010:22, no. 2. Schlumberger. P33
Drijkoningen G.G., 2003. Seismic Data Acquisition,TA3600, Section Applied Geophysics & Petrophysics, Delft University of Technology, P.O. Box 5028, 2600 GA Delft, The Netherlands. P.6-7, 76-77
Gmur D, Kwiecinska B K. 2002. Facies analysis of coal seams from the Cracow Sandstone Series of the Upper Silesia Coal Basin, Poland. International Journal of Coal Geology 52: 29– 44
Hillier A., 2007. ArcGIS 9.3 manual, University of Pennsylvania, School of Design, Cartographic Modeling Lab
Hunt B., R. Lipsman, J. Rosenberg, K. Coombes, J. Osborn, G. Stuck, 2001. A Guide to Matlab for Beginners and Experienced Users, Cambridge University Press, The Edinburgh Building, Cambridge, United Kingdom
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