Quantification of stress and strain using calcite twins and anisotropy of physical rock properties in a folded/fractured reservoir
Date
2009
Authors
Amrouch, K.
Lacombe, O.
Daniel, J.M.
Robion, P.
Callot, J.P.
Bellahsen, N.
Editors
Advisors
Journal Title
Journal ISSN
Volume Title
Type:
Conference item
Citation
Proceedings, 2009
Statement of Responsibility
K. Amrouch, O. Lacombe, J.M. Daniel, P. Robion, J.P. Callot and N. Bellahsen
Conference Name
1st International Petroleum Conference and Exhibition (4 May 2009 - 9 May 2009 : Shiraz, Iran)
Abstract
The description of folded/fractured reservoirs requires the understanding of mechanical behaviour of rocks during deformation. In folds, at the decametric scale, deformation is accommodated by flexural slip, faulting and formation of macroscopic fracture sets. The role of LPS has been recognized for years using magnetic fabric analysis which shows that in siliciclastic deposits the deformation is mainly accommodated by pretilting strain. This paper thus combines analyses of calcite twins, Anisotropy of Magnetic Susceptibility and Anisotropy of P-wave Velocity, together with petrological study to investigate the relationship between fold development and stress/strain. The results are compared to already available and newly collected mesoscale fracture and fault slip data. The Sheep Mountain anticline was chosen as a natural laboratory.Our results show a good agreement between calcite twinning and anisotropy of rocks properties, and with macroscopic fracturing on the other hand. Our study points toward a better description of deformation mechanisms of folded strata. A major result is the consistency of the record of deformation at microscopic and macroscopic scales, emphasizing that core scale data can be relevant to fold-scale structuring. This study yields important constraints for forthcoming modeling of stress distribution during fold development.
School/Discipline
Dissertation Note
Provenance
Description
Extended abstract of paper presented at Structural Geology and Salt Tectonics III session.