دور فك الثني بالتكديس في إضعاف السايزمية المتكررة على مثال منطقة الرصافة, وسط سوريا
Abstract
The presence of multiples on seismic data has obscured the recognition of primary reflection events of interest. Post-stack deconvolution was carried out using final-stacked seismic data. The predictive deconvolution technique is used for multiples suppression. The parameters were computed from autocorrelation functions and tested on different panels of the seismic sections. The test includes mainly the prediction distance and operator length to select the best parameters required to attenuate the existing multiples. The obtained sections were compared with the final sections before post-stack deconvolution was applied. The tested parameters gave very encouraging results by bringing out a distinctive reflector and suppressing multiples. Complete suppression of multiples is the desired result from the application of the selected deconvolution filter; however, multiples seem to exhibit a range of properties and so only those multiples which conform to the predicted assumptions were removed.
يرمي هذا البحث إلى إضعاف الأمواج المتكررة Multiples , التي تعيق إظهار الانعكاسات الأولية Primary reflection events , من خلال تطبيق تقنية فك الثني Deconvolution , لما بعد التكديس للمعطيات السايزمية.
يتضمن البحث حساب باراميترات محددة بإجراء عملية الارتباط الذاتي Autocorrelation , على نطاقات مختلفة من المقاطع السايزمية, بما فيها تقدير المسافة المتوقعة Offset , وطول العامل Operator , لاختيار أفضل وأنسب الباراميترات, التي نحتاجها لإجراء فك الثني.
أوضحت هذه الدراسة من خلال مقارنة المقاطع النهائية المكدسة Final Stack , التي تم الحصول عليها مع المقاطع الزمنية Time seismic sections , قبل عملية التكديس اللاحق Post-Stack , أن تحسنا ملموسا قد طرأ لصالح الانعكاسات الأولية , على الرغم من أن إضعاف الأمواج المتكررة ليس بالأمر السهل, لاحتوائها على مدى واسع من الخواص , مما يعرقل إلى حد ما الوصول إلى ما نصبو إليه, ويتيح الفرصة للتخلص من المتكررات, التي تتوافق مع القياسات المطبقة.
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