Seismic wave propagation modeling in porous media for various frequencies: A case study in carbonate rock

Abstract

A finite volume method for the solution of fluid flows coupled with the mechanical behavior of compacting porous media AIP Conf.Abstract. Seismic wave parameter plays very important role to characterize reservoir properties whereas pore parameter is one of the most important parameter of reservoir. Therefore, wave propagation phenomena in pore media is important to be studied. By referring this study, in-direct pore measurement method based on seismic wave propagation can be developed. Porosity play important role in reservoir, because the porosity can be as compartment of fluid. Many type of porosity like primary as well as secondary porosity. Carbonate rock consist many type of porosity, i.e.: inter granular porosity, moldic porosity and also fracture porosity. The complexity of pore type in carbonate rocks make the wave propagation in these rocks is more complex than sand reservoir. We have studied numerically wave propagation in carbonate rock by finite difference modeling in time-space domain. The medium of wave propagation was modeled by base on the result of pattern recognition using artificial neural network. The image of thin slice of carbonate rock is then translated into the velocity matrix. Each mineral contents including pore of thin slice image are translated to velocity since mineral has unique velocity. After matrix velocity model has been developed, the seismic wave is propagated numerically in this model. The phenomena diffraction is clearly shown while wave propagates in this complex carbonate medium. The seismic wave is modeled in various frequencies. The result shows dispersive phenomena where high frequency wave tends to propagate in matrix instead pores. In the other hand, the low frequency waves tend to propagate through pore space even though the velocity of pore is very low. Therefore, this dispersive phenomena of seismic wave propagation can be the future indirect measurement technology for predicting the existence or intensity of pore space in reservoir rock. It will be very useful for the future reservoir characterization.

Time Lapse Measurement of Reservoir’s Parameters Change due to CO2 Injection in Parigi Carbonate West Java

“…Some studies in Indonesian carbonate characteristics have been reported by some authors, i.e. [1]- [5]. There are some possibilities in the uniqueness of the Indonesian carbonate characteristics, especially in Java, due to high geothermal heat flow which produced by either volcanism activity or fault activity, see [6] This research may reveal the uniqueness of Indonesian carbonate due to the CO2 injection characteristics.…”

The thin section rock physics: Modeling and measurement of seismic wave velocity on the slice of carbonates

“…Our emphasis is to narrowing down the observation and measurement scale so that the influence of the pore structure to the seismic propagation, and particularly seismic velocity can be seen accurately. The wave simulation is based on the finite difference modelling for acoustic propagation which involves the use of neural network for generating velocity and density profile [3,4]. In addition, Kuster-Toksoz theoretical model and Wyllie time average [5] were applied by using the input from pore quantification and constituent fraction in order to give the velocity estimates in thin section scale.…”

“…The second sample (Figure 1b), is the sample that has the mouldic ooid shape pore spaces and composed of mono-mineral matrix of calcite. Quantification of the pore structure was performed by using image analysis technique and the aid of the artificial neural network for segmentation and constituent fraction estimation task [3,4]. The thin section images that originally are in RGB color space need to be transformed into binary in order to enable the pore quantification easily.…”

“…where F m and are expressed as (4) Assuming that the pore in the sample is a pennyshaped fluid-saturated pore, thus the P mi and Q mi take the form:…”

Propagation of Love Wave in Sandy Layer Under Initial Stress Above Anisotropic Porous Half-Space Under Gravity

“…Dai et al reported the Love wave propagation in double-porosity media (Dai and Kuang 2006) and concluded that Love wave speed is higher in single-porosity layer/half-space than in the double-porosity medium, while the attenuation of Love waves is lower in single-porosity layer/half-space than in double-porosity medium. Nurhandoko et al (2012) have done a case study and observed the seismic wave propagation in porous media (carbonate rock) for various frequencies.…”