Borehole transmission tomography for velocity plus statics

Journal Article · Fri Jul 01 04:00:00 EDT 1994 · Geophysics; (United States)

DOI:https://doi.org/10.1190/1.1443659· OSTI ID:6957563

Squires, L J; Stoffa, P L ^[1]; Cambois, G ^[2]

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1. Univ. of Texas, Austin, TX (United States). Inst. for Geophysics
2. Compagnie Generale de Geophysique, Massy (France)

The accuracy of velocity tomograms reconstructed from borehole transmission traveltime data is highly sensitive to traveltime statics. The authors present a least-squares tomography algorithm that includes a traveltime static term. The algorithm solves for both the velocity field and the traveltime statics simultaneously. This enables us to separate traveltime signal from traveltime noise, reducing the tomographic velocity artifacts caused by the statics. The incorporation of a priori constraints on the poorly determined spectral components of the velocity field further improves accuracy by reducing velocity artifacts as a result of uneven ray coverage. Application of the algorithm to numerical crosswell data results in velocity and statics' estimates that are accurate to within 1%. Application of the algorithm to Exxon's Friendswood tomography data results in velocity and statics' estimates that correlate with independent data.

• OSTI ID: 6957563
• Journal Information: Geophysics; (United States), Journal Name: Geophysics; (United States) Vol. 59:7; ISSN GPYSA7; ISSN 0016-8033
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200 -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
440400* -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
ACCURACY
ALGORITHMS
BOREHOLES
CAVITIES
DATA PROCESSING
DIAGNOSTIC TECHNIQUES
MATHEMATICAL LOGIC
MATHEMATICAL MODELS
PROCESSING
RADIOACTIVITY LOGGING
TOMOGRAPHY
WELL LOGGING