Reflection FWI in MBTT formulation: Macro velocity reconstruction

V. Tcheverda, K. Gadylshin, G. Chavent, C. Shin, J. Shin

Результат исследования: Публикации в книгах, отчётах, сборниках, трудах конференцийстатья в сборнике материалов конференциинаучнаярецензирование

Аннотация

Unfortunately we have to admit that after decades of development there are still no reliable techniques of full waveform inversion which guarantee reliable reconstruction of both macrovelocity model and reflectors reconstruction for reasonable acquisitions and frequency ranges. As reasonable we mean realistic offsets (about one-two depths of target objects) and temporal frequency above 5-7 Hz. The paper is devoted to the so-called Migration Based Travel Times (MBTT) formulation of the data misfit functional. This approach relies on the decomposition of a velocity model onto two subspaces - smooth propagator and rough depth reflectors. On this base the modified data misfit functional is introduced and compared with standard least squares formulation. Numerical Singular Value Decomposition proves that these two formulations produce functionals which have almost orthogonal stable subspaces. As is well known the classical formulation leads to stable subspaces mainly made of fast oscillating functions (reflectors). At the same time we prove that MBTT modification ensures appearance of the propagator in these stable subspaces. Numerical experiments prove the feasibility of full inversion for reflected waves in this modified reformulation for the well known Gullfaks velocity model.

Язык оригиналаанглийский
Название основной публикации7th EAGE Saint Petersburg International Conference and Exhibition
Подзаголовок основной публикацииUnderstanding the Harmony of the Earth's Resources Through Integration of Geosciences
ИздательEuropean Association of Geoscientists and Engineers, EAGE
Страницы69-73
Число страниц5
ISBN (электронное издание)9781510822498
DOI
СостояниеОпубликовано - 2016
Опубликовано для внешнего пользованияДа
Событие7th EAGE Saint Petersburg International Conference and Exhibition: Understanding the Harmony of the Earth's Resources Through Integration of Geosciences - Saint Petersburg, Российская Федерация
Продолжительность: 11 апр 201614 апр 2016

Серия публикаций

Название7th EAGE Saint Petersburg International Conference and Exhibition: Understanding the Harmony of the Earth's Resources Through Integration of Geosciences

Конференция

Конференция7th EAGE Saint Petersburg International Conference and Exhibition: Understanding the Harmony of the Earth's Resources Through Integration of Geosciences
СтранаРоссийская Федерация
ГородSaint Petersburg
Период11.04.201614.04.2016

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