Effective Pressure Prediction from 4D Seismic AVO Data During CO2-EOR and Storage

10 Pages Posted: 9 Apr 2021

See all articles by Haofan Wang

Haofan Wang

Northwest University (China)

Jinfeng Ma

Northwest University (China)

Date Written: April 8, 2021

Abstract

The use of the time-lapse seismic difference analysis methods, time-lapse AVO forward and inverse technology to study and distinguish the changes in saturation and pressure caused by CO2 injection into reservoirs is one of the difficult issues in the current technology research for monitoring CO2 geological storage. Based on the time-lapse seismic AVO inversion method proposed by Landrø, this paper distinguishes the fluid saturation and pressure effect after CO2 injection. First, establish a petrophysical model with simultaneous changes in CO2 saturation and pressure, and then use the Smith & Gidlow’s AVO simplified equation based on the Landrø method to derive the relationship between the saturation differences (ΔS), pressure differences (ΔP) and the time-lapse AVO intercept differences (ΔR0), gradient differences (ΔG). The relationship is further applied to the actual time-lapse seismic AVO inversion to quantitatively analyze the saturation and pressure changes after CO2 injection. The effective pressure difference value obtained by inversion has a good match with the measured wellhead pressure difference value, which can well explain the pressure sweep range and the pressure difference change caused by CO2 injection in the reservoir, which provides a basis for monitoring the underground occurrence state and storage safety of CO2.

Keywords: Effective pressure, CO2 saturation; CO2 seismic monitoring; Time-lapse AVO

Suggested Citation

Wang, Haofan and Ma, Jinfeng, Effective Pressure Prediction from 4D Seismic AVO Data During CO2-EOR and Storage (April 8, 2021). Proceedings of the 15th Greenhouse Gas Control Technologies Conference 15-18 March 2021, Available at SSRN: https://ssrn.com/abstract=3822057 or http://dx.doi.org/10.2139/ssrn.3822057

Haofan Wang (Contact Author)

Northwest University (China)

229 Taibai North Rd
Beilin
Xian, Shaanxi
China

Jinfeng Ma

Northwest University (China) ( email )

229 Taibai North Rd
Beilin
Xian, Shaanxi
China

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