Detecting hydrocarbon reservoirs from CSEM data in complex settings: Application to deepwater Sabah, Malaysia

Autor:	René-Édouard Plessix, Matthew Choo, Kok Yip-Cheong, Mathieu Darnet, Eldon Sims, John Voon, M. Rosenquist
Rok vydání:	2007
Předmět:	Geophysics Multigrid method Petroleum engineering Geochemistry and Petrology Finite difference analysis Computational electromagnetics Geotechnical engineering Solver Grid Geology
Zdroj:	GEOPHYSICS. 72:WA97-WA103
ISSN:	1942-2156 0016-8033
DOI:	10.1190/1.2435201
Popis:	Controlled-source electromagnetic (CSEM) field surveys offer a geophysical method to discriminate between high and low hydrocarbon saturations in a potential reservoir. However, the same geological processes that create the possible hydrocarbon reservoir may also create topography and near-surface variations of resistivity (e.g., shallow gas or hydrates) that can complicate the interpretation of CSEM data. In this paper, we discuss the interpretation of such data over a thrust belt prospect in deepwater Sabah, Malaysia. We show that detailed modeling of the key scenarios can help us understand the contributions of topography, near-surface hydrates, and possible hydrocarbons at reservoir depth. Complexity at the surface and at depth requires a 3D electromagnetic modeling code that can handle realistic ten-million-cell models. This has been achieved by using an iterative solver based on a multigrid preconditioner, finite-difference approach with frequency-dependent grid adaptation.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1096fcfbc3f847df5bb134332b3db596 https://doi.org/10.1190/1.2435201 Zobrazit plný text záznamu