What is it about?
Understanding the effect of fluid saturation in rocks is crucial to characterize the hydrocarbon and sequestration injection reservoirs. Work starts with the selection of suitable rock physics model demonstrating the assumptions and limitations of existing rock physics models. In this work, we tried to establish the application of the CPET rock physics model to the dataset from the Sleipner CO2 sequestration field for saturation prediction.
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Why is it important?
Monitoring of saturation specially becomes challanging during a sequestration/ enhanced oil recovery program because objective is to understand the amount of initial fluid replaced by liquid/gas injection and identify the probability of leakage with time. In this work , saturation has been estimated by selecting an appropriate model (CPET) followed by establishing a relationship with Acoustic impedance volumes resulted from inverting 4D seismic data of Sleipner injection site. We predicted all injected CO2 amount to 17 Mt till 2017 will migrate and accumulate to the topmost layer after 50 years of the commencement of injection in 1996 through this study.
Perspectives
Writing a paper on advanced rock physics model which industry need to incorporate whenever required and it's complete analysis in Sleipner injection site data set, integration with 4D inversion has given me immense pleasure. This paper is a good example of integrated collaborative efforts with objective of solving a real problem of Geophysics which is a challenge and requirement of industry and academia.
Moumita Sengupta
Cairn Oil & Gas pvt ltd
Read the Original
This page is a summary of: CPET mapping of 4D seismic inversion results to predict saturation in a gas-water system, Geophysics, November 2022, Society of Exploration Geophysicists,
DOI: 10.1190/geo2022-0054.1.
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