Anisotropic depth imaging in presence of stress: transversely Isotropic or orthorhombic?

Autor:	Robert Bloor, Olga Zdraveva, Dave Nichols
Rok vydání:	2015
Předmět:	Azimuth Stress (mechanics) Optics Depth imaging business.industry Transverse isotropy General Engineering Orthorhombic crystal system Geometry Anisotropy business Geology
Zdroj:	ASEG Extended Abstracts. 2015:1-4
ISSN:	2202-0586
DOI:	10.1071/aseg2015ab082
Popis:	SUMMARY Presence of oriented stresses and fractures in the subsurface can pose significant challenge when imaging wide-azimuth and multi-azimuth data using transverse isotropy as an approximation to describe the medium. We describe the key components of an orthorhombic modelbuilding and updating workflow for depth imaging in areas affected by stress. We discuss several different options for deriving the initial parameters describing orthorhombic medium and their dependencies on the geometry of the available seismic data. We demonstrate the effectiveness of the workflow on real data from the Gulf of Mexico. Compared to transversely isotropic imaging, the orthorhombic imaging flattens the common-image-point gathers in all azimuths and results in improvements of image focussing.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::9a9b3fcc7509c67fe47cd2f64e4458f4 https://doi.org/10.1071/aseg2015ab082 Zobrazit plný text záznamu