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Introduction

This investigation was undertaken to evaluate the processing flows needed to obtain vertical and radial post-stack-migrated seismic sections from a heavy-oil reservoir in eastern Alberta. Converted-wave seismic processing flows have been previously investigated and documented by Harrison (1992) and Isaac (1996). Of particular importance to converted-wave processing is the analysis of receiver statics. Isaac (1996) and Cary and Eaton (1993) showed that S-wave receiver statics can be extremely large and variable compared to P-wave receiver statics. It is not uncommon to have S-wave receiver statics on the order of ±200 ms, whereas P-wave receiver statics are commonly small, typically less than 20 ms.

Velocity analysis is an integral component of converted-wave processing. There has been extensive research relating to nonhyperbolic moveout, valid for weak anisotropy. In many cases, for short to medium offset P-P data, hyperbolic normal moveout (NMO) is an adequate approximation for moveout used in velocity estimations (Al-Chalabi, 1973; Tsvankin and Thomsen, 1994; Alkhalifah, 1997). For P-S data, the hyperbolic NMO correction is valid only for short offsets (Iverson et al., 1989). Furthermore, Castagna and Chen (2000) found that conventional processing software assumes hyperbolic moveout and may produce false structure and false responses below anisotropic regions because of improper removal of NMO. It has been found that the overlying rock in some heavy-oil areas exhibits high values of anisotropy. Newrick and Lawton (2003) found that at Pikes Peak, Saskatchewan, the Thomsen parameters of anisotropy have values of ϵ=0.12±0.02 and δ=0.30±0.06 , from data using a multioffset vertical seismic profile. If the Jackfish area is similar, there is a need to explore the results based on nonhyperbolic NMO as opposed to the standard hyperbolic NMO calculations.

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