Anisotropic elastic least-squares reverse time migration with density variations in vertical transverse isotropic media

• Autorzy: Zhong Yu , Gu Hanming , Liu Yangting , Luo Xia , Mao Qinghui , Xu Kai

Identyfikatory

DOI

10.1007/s11600-023-01092-7

• Języki publikacji: EN

Abstrakty

EN

Elastic least-squares reverse time migration (ELSRTM) has the potential to provide higher-quality migration images related to the lithology and fluid by imaging multi-component seismic data than conventional elastic reverse time migration (ERTM). Oil and gas are widely stored in fractures and sedimentary rocks. The sedimentary rocks and the rocks with fractures will produce anisotropy. The anisotropy effect should be corrected in migration. In order to correct the anisotropic effect to the images of ELSRTM, a new anisotropic ELSRTM scheme is developed to image the multi-component seismic data in vertical transverse isotropic (VTI) media. This new ELSRTM method can invert high-quality images and correct the anisotropic effect in VTI media. Many ELSRTM methods assume that the density is constant. However, the constant-density assumption will generate false migration results when the density of media is variation. We derive the elastic VTI de-migration operator in the media with density variations based on Born approximation. The adjoint state equations and gradient formulas with respect to medium images in VTI media with density variations are also derived by the adjoint state method. Using the new elastic de-migration operator, adjoint state equations, and gradients in VTI media with density variations, we can produce high-resolution subsurface elastic reflectivity images. Numerical examples from the graben VTI model and modified HESS VTI model demonstrate that the proposed ELSRTM can not only generate the images with high quality but also correct the anisotropic effect in VTI media with density variations.

Słowa kluczowe

EN

elastic least-squares reverse time migration; vertical transverse isotropic media; variable density; multi-kompozyt

PL

elastyczna migracja w czasie metodą najmniejszych kwadratów; pionowe poprzeczne ośrodki izotropowe

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2024
• Tom: Vol. 72, no. 1
• Strony: 67--83
• Opis fizyczny: Bibliogr. 32 poz.

Twórcy

autor

Zhong Yu

• College of Electrical & Information, Hubei University of Automotive Technology, Shiyan 442002, China

• https://orcid.org/0000-0002-9559-5064

autor

Gu Hanming

• Hubei Subsurface Multi-Scale Imaging Key Laboratory, School of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China

autor

Liu Yangting

• First Institute of Oceanography, Ministry of Natural Resources, National Laboratory for Marine Science and Technology, Qingdao 266237, China

autor

Luo Xia

• Geophysical Research Institute, Sinopec Shengli Oilfield Company, Dongying 257000, China

autor

Mao Qinghui

• Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Cooperative Innovation Center of Unconventional Oil and Gas (Ministry of Education & Hubei Province), Yangtze University, Wuhan 430100, China

autor

Xu Kai

• Sinopec Geophysical Research Institute, Nanjing 211103, China

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