Abstract
The paper proposes a new approach for using of combination of radioactivity logging, which allows determining a set of gas reservoir parameters (nature of saturation, true porosity, gas saturation coefficient) taking into account influence of the pressure and temperature conditions of occurrence. Analysis of the ways of averaging the neutron-apparent porosity and the density-apparent porosity for obtaining the true porosity was made. Method of determination of gas saturation, which uses the same combination of radioactivity logging as in determining the true porosity of gas reservoirs, was developed. The results presented in the paper, were obtained over a wide range of depth (up to 10 km). Application of developed approaches for determination of petro-physical parameters of gas reservoirs is demonstrated by the example of cased coalbed methane well.
Highlights
The subject of investigation is a gas reservoir in open and cased wells taking into account the pressure and temperature conditions of occurrence (PT-conditions).Porosity, gas saturation and permeability are the main petrophysical parameters of gas reservoirs
In actual practice, when the invasion depth exceeds the depth of investigation of density-neutron loggings, identification of gas reservoirs and determination of their true porosity on the basis of the combination of radioactive loggings are possible, as well as a quantitative estimation of residual gas saturation [Кulyk et al, 2014]
The problem of identification of gas reservoirs and determination of their petrophysical parameters in principle can not be solved by separate logging methods and requires a combined approach. One such approach is the use of combination of radioactive logging methods, which works in both open and cased wells
Summary
The subject of investigation is a gas reservoir in open and cased wells taking into account the pressure and temperature conditions of occurrence (PT-conditions).Porosity, gas saturation and permeability are the main petrophysical parameters of gas reservoirs. In actual practice, when the invasion depth exceeds the depth of investigation of density-neutron loggings, identification of gas reservoirs and determination of their true porosity on the basis of the combination of radioactive loggings are possible, as well as a quantitative estimation of residual gas saturation [Кulyk et al, 2014].
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