Macrovelocity reconstruction by reflection FWI

V. Tcheverda, G. Chavent, K. Gadylshin

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

3 Цитирования (Scopus)

Аннотация

The paper deals with development of reliable techniques of full waveform inversion which guarantee correct reconstruction of a macrovelocity model 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 proposes the so-called Migration Based Travel Times (MBTT) formulation of the data misfit functional in time frequency domain. 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 Marmoussi velocity model. We demonstrate Common Image Gathers for initial guess and reconstructed model to valdate good quality of reconstructed velocity.

Язык оригиналаанглийский
Название основной публикации78th EAGE Conference and Exhibition 2016
Подзаголовок основной публикацииEfficient Use of Technology - Unlocking Potential
ИздательEuropean Association of Geoscientists and Engineers, EAGE
ISBN (электронное издание)9789462821859
DOI
СостояниеОпубликовано - июн 2016
Опубликовано для внешнего пользованияДа
Событие78th EAGE Conference and Exhibition 2016: Efficient Use of Technology - Unlocking Potential - Vienna, Австрия
Продолжительность: 30 мая 20162 июн 2016

Серия публикаций

Название78th EAGE Conference and Exhibition 2016: Efficient Use of Technology - Unlocking Potential

Конференция

Конференция78th EAGE Conference and Exhibition 2016: Efficient Use of Technology - Unlocking Potential
СтранаАвстрия
ГородVienna
Период30.05.201602.06.2016

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