Abstract
Understanding elastic properties of reservoir rocks is essential for seismic modeling under different saturation conditions as well as lithology discrimination. Experiments on elastic properties of limestones are significantly less published compared to siliciclastic sedimentary rocks. The current study presents the results of laboratory measurements on Pannonian Basin limestone cores. The research was carried out for the first time for a hydrocarbon reservoir in the Bjelovar Depression, located in the southern part of the Pannonian Basin. Ultrasonic velocity measurements and determination of dynamic elastic properties were performed on limestone plugs, in dry and saturated condition under different confining pressure steps. Based on the results obtained in laboratory conditions, an empirical relationship between shear wave velocity (Vs) and compressional wave velocity (Vp) has been defined. The saturated samples show an effect of shear modulus weakening, while three samples have a shear modulus strengthening effect. Two models were used in the interpretation of the measured data, the Kuster and Toksöz and the Xu-Payne model. The results show that the Xu-Payne model describes the data well and the dominant pore type system in the limestone samples can been identified. The interpretation revealed an interparticle pore system with a fraction of microcracks from 20% to 35%. The results have helped to understand the elastic properties of limestones from the southern part of the Pannonian Basin, which are necessary for any process of reservoir characterization, such as porosity distribution and permeability variation.
Highlights
The elastic property of rock is useful information for oil or gas reservoir characterization, especially for carbonate reservoirs
The results have helped to understand the elastic properties of limestones from the southern part of the Pannonian Basin, which are necessary for any process of reservoir characterization, such as porosity distribution and permeability variation
This paper presents the results of laboratory measurements of ultrasonic wave velocities on limestone cores, which were performed for the first time for a hydrocarbon reservoir located in the Pannonian Basin, Croatia
Summary
The elastic property of rock is useful information for oil or gas reservoir characterization, especially for carbonate reservoirs. Elastic parameters are essential for the reservoir seismic response modeling under different saturation conditions, for lithology discrimination. Carbonates contain 60% of the world’s oil reserves [1], but there are only a few experiments dealing with elastic properties of carbonates compared to siliciclastic sedimentary rocks. This paper presents the results of laboratory measurements of ultrasonic wave velocities on limestone cores, which were performed for the first time for a hydrocarbon reservoir located in the Pannonian Basin, Croatia. The ultrasonic velocity measurements were performed on the Bjelovar Depression gas reservoir core samples. Laboratory measurements of porosity and velocity under different confining pressures were analyzed
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