It is due to the differences in density between the oil and gas environments. Generally, gas is less dense than oil. Consequently, when the mechanical waves attempts to pass through the gas environment, it encounters less resistance compared to the oil environment where they encounter much resistance. Therefore in the gas environment, the amplitude of the penetrating mechanical wave will be higher than in the adjoining environments thus making the direct detection of gas possible..
It is due to the differences in density between the oil and gas environments. Generally, gas is less dense than oil. Consequently, when the mechanical waves attempts to pass through the gas environment, it encounters less resistance compared to the oil environment where they encounter much resistance. Therefore in the gas environment, the amplitude of the penetrating mechanical wave will be higher than in the adjoining environments thus making the direct detection of gas possible..
Dear Abubakar: if you are talking about seismic tools to detect gas and oil, is correct that you thinking about density, as a physical idea.
But, the real measurements that you have with the seimic tools, is not only density, but also it is the relative acoustic impedance´s contrast. It means: we are talking about not only density contrast, but also P-wave velocities.
In the last 40 years, the effort are focusing in the relationship between the gas reservoirs and the amplitude of seismic in poststack domain.
After the landmark Ostrander´s paper, the prestack domain, such as AVO (Amplitude versus Offsets) and then, seismic inversión, are the best practices for gas reservoirs.
Best wishes, Mario E. Sigismondi
Because the density difference between the porewater and the gas is significantly higher than that between oil and the porewater
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