Local Ray-Based Traveltime Computation Using the Linearized Eikonal Equation

الموضوعات

علوم بحتة وطبيعية

الملخص

The computation of traveltimes plays a critical role in the conventional implementations of Kirchhoff migration. Finite-difference-based methods are considered one of the most effective approaches for traveltime calculations and are therefore widely used. However, these eikonal solvers are mainly used to obtain early-arrival traveltime. Ray tracing can be used to pick later traveltime branches, besides the early arrivals, which may lead to an improvement in velocity estimation or in seismic imaging. In this thesis, I improved the accuracy of the solution of the linearized eikonal equation by constructing a linear system of equations (LSE) based on finite-difference approximation, which is of second-order accuracy. The ill-conditioned LSE is initially regularized and subsequently solved to calculate the traveltime update. Numerical tests proved that this method is as accurate as the second-order eikonal solver. Later arrivals are picked using ray tracing. These traveltimes are binned to the nearest node on a regular grid and empty nodes are estimated by interpolating the known values. The resulting traveltime field is used as an input to the linearized eikonal algorithm, which improves the accuracy of the interpolated nodes and yields a local ray-based traveltime. This is a preliminary study and further investigation is required to test the efficiency and the convergence of the solutions.

روابط وملفات

التعريف والنوع

رقم الوثيقة

08ac55e1-1c8d-4259-bc78-b8d61659acc1

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل ماجيستير

نوع الملف

pdf text

أسماء الملفات

1700634_1.pdf

بيانات النشر

ألقاب المؤلفين

[{"name_ar":"طارق علي الخليفة","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"محمد المبارك ","title_ar":"اعداد","title_en":"Preparation"}]

اللغة

English

المصدر والدورية

اسم المصدر

Local Ray-Based Traveltime Computation Using the Linearized Eikonal Equation

المحتوى والصفحات

عدد الصفحات

0

كلمات الباحثين

Eikonal , Linearized, Local , Ray Tracing , Traveltime

إشراف وإعداد

الإشراف

طارق علي الخليفة

الإعداد

محمد المبارك

الاقتباسات الببليوغرافية