تعد ظلال الترددات المنخفضة أحد أهم مؤشرات تجمعات النفط و الغاز. يمكن التقاط هذه الترددات عن
طريق تحليل التردد – زمن، الذي يزود بميز ترددي عالٍ عند الترددات المنخفضة و ميز زمني عالٍ عند
الترددات المرتفعة، هذا الشيء يعد مرغوبًا من أجل تحليل المعطيات الاهتزازية و تفسيرها لأن مكامن
الهيدروكربونات تشخص بشكل أفضل عند الترددات المنخفضة. لقد طبق هذا التحليل على معطيات
اهتزازية مأخوذة من تركيب فهدة و هو حاوٍ على النفط و يقع في هضبة حلب. إن إضافة محور التردد إلى
المقطع الاهتزازي العادي ثنائي البعد يجعل المعطيات بأبعاد ثلاثية. بمقارنة المقاطع ثلاثية الأبعاد ذات
التردد الوحيد نستطيع أن نشاهد الظلال الترددية المنخفضة بسطوع على المقاطع وحيدة التردد بشكل
نسبي في تركيب فهدة عند الترددات المنخفضة. و قد أعطت شواذَّ سعوية عالية نسبيًا تحت النطاق
الحاوي على النفط . ثم اختفت هذه الشواذ في مقاطع الترددات العالية.
Low frequency shadows is one of hydrocarbons indicators. It can be
detected by means of a time-frequency decomposition which can provide higher
frequency resolution at lower frequencies and higher time resolution at higher
frequencies. This is desirable for analyzing seismic data, because the
hydrocarbons in reservoir are diagnostic at lower frequencies. we have carried
out such analyses with post-stack data sets on Fahda field which is located in
Aleppo uplift, it contains oil. Adding a frequency axis to a 2D seismic section
makes the data 3D axis. The comparison of the single frequency sections from
such 3D volume can be utilized to detect low frequency shadows. A
preferentially illuminated single frequency section at lower frequencies from
Fahda field, shows high amplitude low frequency anomalies beneath oil zones.
These anomalies disappear at higher frequencies.
References used
Addison, P. S. (2002). The illustrated wavelet transform handbook, London, UK
Castagna, J. Anno, P and Taner et al., (2005). Spectral Decomposition of Seismic Data with Continuous Wavelet Transform, School of Geology and Geophysics, University of Oklahoma,U.S.A. Phil Anno
Iske, A; Randen, T. (2005). Mathematical methods and modelling in hydrocarbon exploration and production. University of Leicester, Department of Mathematics, United Kingdom. Avner Friedman
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