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Integrated turning-ray and reflection tomography for velocity model building in foothill areas

Jun Tian, Gengxin Peng, Junru Jiao, Grace Yan and Xianhuai Zhun
Integrated turning-ray and reflection tomography for velocity model building in foothill areas
Interpretation (Tulsa) (November 2018) 6 (4): SM63-SM70

Abstract

A special challenge for land seismic exploration is estimating velocities, in part due to complex near-surface structures, and in some instances because of rugose topography over foothills. We have developed an integrated turning-ray and reflection-tomographic method to face this challenge. First, turning-ray tomography is performed to derive a near-surface velocity-depth model. Then, we combine the near-surface model with the initial-subsurface model. Taking the combined model as starting model, we go through a reflection tomographic process to build the model for imaging. During reflection tomography, the near-surface model and subsurface models are jointly updated. Our method has been successfully applied to a 2D complex synthetic data example and a 3D field data example. The results demonstrate that our method derives a very decent model even when there is no reflection information available in a few hundred meters underneath the surface. Joint tomography can lead to geologic plausible models and produce subsurface images with high fidelity.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 6
Serial Issue: 4
Title: Integrated turning-ray and reflection tomography for velocity model building in foothill areas
Affiliation: PetroChina, Tarim Oilfield Company, Korla, China
Pages: SM63-SM70
Published: 201811
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 13
Accession Number: 2019-007382
Categories: Applied geophysicsEconomic geology, geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Special section; Foothills exploration
Illustration Description: illus.
N36°00'00" - N40°19'60", E76°00'00" - E92°19'60"
N40°00'00" - N44°49'60", E68°00'00" - E96°00'00"
N42°00'00" - N84°00'00", W141°00'00" - W52°00'00"
Secondary Affiliation: Forland Geophysical Services, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 2019
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