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Title: TIME-LAPSE MODELING AND INVERSION OF CO2 SATURATION FOR SEQUESTRATION AND ENHANCED OIL RECOVERY

Abstract

In this quarter we have continued our development of the inversion procedure for Phase III, in which time-lapse changes in seismic attributes are inverted to yield changes in CO{sub 2} fluid properties over time. In order to extract seismic attributes from the Sleipner North Sea CO{sub 2} time-lapse data set, a new, detailed interpretation was performed and multiple horizons were picked for the 1994 and 2002 vintages. Traveltime difference maps were constructed at several levels within the Sleipner CO{sub 2} injection zone, and were quantitatively analyzed. No traveltime change was seen in the overburden, as expected, while significant changes were seen in the upper half of the CO{sub 2} injection zone. Evidence of thin-bed tuning and undershooting was also found. A new semi-automated, quantitative method for estimating time sag anomalies was developed, and was used to calculate the amount of time sag along a selected horizon. The resulting time sag estimates matched those seen in the traveltime difference maps. Such a method will be useful for obtaining rapid, accurate quantitative measurements of traveltime changes in the Sleipner data cubes. The traveltime changes will be combined with other attributes, such as amplitude and frequency changes, for input into the real-data inversion.

Authors:
Publication Date:
Research Org.:
4TH Wave Imaging Corporation (US)
Sponsoring Org.:
(US)
OSTI Identifier:
840946
DOE Contract Number:  
FC26-03NT15417
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 25 May 2005
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 54 ENVIRONMENTAL SCIENCES; CARBON SEQUESTRATION; CARBON DIOXIDE INJECTION; NORTH SEA; SATURATION; COMPUTERIZED SIMULATION; ENHANCED RECOVERY; PETROLEUM; FLUID MECHANICS

Citation Formats

Meadows, Mark A. TIME-LAPSE MODELING AND INVERSION OF CO2 SATURATION FOR SEQUESTRATION AND ENHANCED OIL RECOVERY. United States: N. p., 2005. Web. doi:10.2172/840946.
Meadows, Mark A. TIME-LAPSE MODELING AND INVERSION OF CO2 SATURATION FOR SEQUESTRATION AND ENHANCED OIL RECOVERY. United States. https://doi.org/10.2172/840946
Meadows, Mark A. 2005. "TIME-LAPSE MODELING AND INVERSION OF CO2 SATURATION FOR SEQUESTRATION AND ENHANCED OIL RECOVERY". United States. https://doi.org/10.2172/840946. https://www.osti.gov/servlets/purl/840946.
@article{osti_840946,
title = {TIME-LAPSE MODELING AND INVERSION OF CO2 SATURATION FOR SEQUESTRATION AND ENHANCED OIL RECOVERY},
author = {Meadows, Mark A},
abstractNote = {In this quarter we have continued our development of the inversion procedure for Phase III, in which time-lapse changes in seismic attributes are inverted to yield changes in CO{sub 2} fluid properties over time. In order to extract seismic attributes from the Sleipner North Sea CO{sub 2} time-lapse data set, a new, detailed interpretation was performed and multiple horizons were picked for the 1994 and 2002 vintages. Traveltime difference maps were constructed at several levels within the Sleipner CO{sub 2} injection zone, and were quantitatively analyzed. No traveltime change was seen in the overburden, as expected, while significant changes were seen in the upper half of the CO{sub 2} injection zone. Evidence of thin-bed tuning and undershooting was also found. A new semi-automated, quantitative method for estimating time sag anomalies was developed, and was used to calculate the amount of time sag along a selected horizon. The resulting time sag estimates matched those seen in the traveltime difference maps. Such a method will be useful for obtaining rapid, accurate quantitative measurements of traveltime changes in the Sleipner data cubes. The traveltime changes will be combined with other attributes, such as amplitude and frequency changes, for input into the real-data inversion.},
doi = {10.2172/840946},
url = {https://www.osti.gov/biblio/840946}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed May 25 00:00:00 EDT 2005},
month = {Wed May 25 00:00:00 EDT 2005}
}