An integrated target-oriented prestack elastic waveform inversion: Sensitivity, calibration, and application

Journal Article · Thu Sep 01 04:00:00 EDT 1994 · Geophysics; (United States)

DOI:https://doi.org/10.1190/1.1443697· OSTI ID:6934948

Pan, G S; Young, C Y ^[1]; Castagna, J P

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1. ARCO, Plano, TX (United States)

An integrated target-oriented prestack elastic waveform inversion procedure is implemented to estimate lithology, fluid type, and pay thickness of a layered target zone from surface seismic PP reflection data. The integrated inversion procedure consists of three parts: data processing and preparation, iterative seismic inversion, and rock property integration. In the data processing and preparation, the seismic field gathers are processed and transformed into plane-wave seismograms, and the well-logs are prepared for establishing a well tie. The well tie is established using synthetics from a layered model obtained from blocking sonic, shear sonic, and density logs. The layered model is later used as the a priori starting model for the iterative seismic inversion. Based on the a priori starting model and using the processed plane-wave seismograms as input, P-wave velocity (V[sub P]), S-wave velocity (V[sub S]), density ([rho]), and thickness (h) of each layer in the layered target zone are estimated at each CDP location in the iterative seismic inversion. Through the rock property integration, the inverted seismic parameters are related to the reservoir properties: the lithology/fluid contents, and the net pay thickness. Synthetic examples of gas-related bright spot models are used to illustrate the functionality of the procedure. The sensitivity and the vertical resolution of the inversion procedure are investigated. Under favorable conditions, the inversion procedure is able to estimate the net pay thickness down to a tenth of a wavelength. In noisy situations, the inversion tends to break down where the thickness of target is approximately equal to the tuning thickness.

• OSTI ID: 6934948
• Journal Information: Geophysics; (United States), Journal Name: Geophysics; (United States) Vol. 59:9; 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
58 GEOSCIENCES
580000 -- Geosciences
ATLANTIC OCEAN
CARIBBEAN SEA
DATA PROCESSING
FUNCTIONS
GEOLOGIC DEPOSITS
GEOPHYSICAL SURVEYS
GULF OF MEXICO
MINERAL RESOURCES
NATURAL GAS DEPOSITS
PETROLEUM DEPOSITS
PROCESSING
RESERVOIR ROCK
RESOURCES
RESPONSE FUNCTIONS
SEAS
SEISMIC SURVEYS
SEISMIC WAVES
SURFACE WATERS
SURVEYS