Laboratory measurements of elastic and anelastic parameters dry water-saturated sandstones with low (0.7- 1.1-mD) high (425-mD) permeability have been conducted at seismic frequencies (0.1 to 120 Hz). The experiments were performed a laboratory apparatus that measures the stress-strain relationship in linear regime. extensional attenuation low-permeability exhibits prominent peaks band, accompanied by considerable dispersion. Variations dispersion high-permeability sandstone are below...

ABSTRACT A significant portion of the world's hydrocarbon reserves are found in carbonate reservoirs, yet analysis petrophysical properties these reservoirs is associated with a number challenges. Some challenges stem from physical and chemical interactions between rock matrix pore fluids, which can affect elastic rock. Hence, study fluid effects on carbonates important for understanding change field performance а reservoir caused by movements during extraction producing fields. In this...

ABSTRACT Petrophysical properties of carbonate reservoirs are less predictable than that siliciclastic reservoirs. One the main reasons for this is physical and chemical interactions rocks with pore fluids. Such can significantly change elastic rock matrix grains, making applicability Gassmann's fluid substitution procedure debatable. This study an attempt to understand mechanisms fluid‐rock influence these on parameters carbonates. We performed precise indentation tests Savonnières...

Abstract We present a simple procedure concerning the application of Kramers‐Kronig relation for validation laboratory measurements extensional attenuation and Young's modulus carried out on solid specimens at seismic frequencies. The local approximation relationship was applied to verify seismic‐frequency conducted four specimens: viscoelastic polymethyl‐methacrylate (PMMA) sample, two water‐ one glycerol‐saturated sandstone samples. experimental tests were performed various axial (PMMA...

ABSTRACT The aim of this study was to investigate the effects supercritical CO 2 (scCO ) injection on elastic and anelastic properties sandstone at seismic ultrasonic frequencies. We present results low‐frequency experiments conducted water‐saturated (Donnybrook, Western Australia) flooded with scCO . cut in direction perpendicular a formation bedding plane tested Hoek triaxial pressure cell. During 2, systems pump dispensing were held temperature 42°C. parameters obtained for (0.1 Hz–100...

Summary Knowledge of dispersion and attenuation in sedimentary rocks is important for understanding variations seismic properties reservoirs. These are often related to the presence fluids pore space rocks. In most saturated with fluid characterized by low mobility, which can stem either from intrinsic permeability or high viscosity, relative motion between a rock skeleton makes significant impact on acoustic wave elastic moduli at frequencies. But our current velocity limited due lack...

The paper studies the influence of supercritical CO2 (scCO2) on elastic and inelastic properties sandstone at seismic frequencies (0.1 - 100 Hz). frequency experiments were performed with a low-frequency laboratory apparatus utilizing stress-strain relationship, which was developed to measure complex Young's moduli rocks strain amplitudes from 10-8 10-6. conducted water saturated (Donnybrook, Western Australia) flooded scCO2. During scCO2 system pump held temperature 42° C. parameters...

ABSTRACT We present the results of a low‐frequency study Mancos shale, where we first elaborate stress–strain methodology laboratory experiments to estimate elastic moduli shales, and then apply this investigate influence partial water saturation on anelastic parameters, velocities P‐wave anisotropy shale. also analyse applicability anisotropic Gassmann theory for predictions stiffness tensor components water‐saturated shale with non‐expandable clay content presented in our case by illite...

In this paper we present a new version of low‐frequency laboratory apparatus designed for measurements complex Young's moduli and extensional attenuation rock samples at seismic (1÷400 Hz) teleseismic (≤1Hz) wave frequencies. The device can operate confining or uniaxial pressures from 0 to 70 MPa. preliminary data obtained sandstone quarried in Donnybrook, Western Australia, are presented.

Abstract Theoretical and practical aspects of using multi‐pulse spin‐locking the “strong off‐resonant comb” (SORC) sequence for detecting nitrogenated substances by nuclear quadrupole resonance method were studied. A number optimum correlations between parameters sequences relaxation characteristics under investigation determined. The obtained relations used fast detection α‐trinitrotoluene (TNT). Relaxation temperature coefficients twelve 14 N lines orthorhombic phase TNT measured at room...

ABSTRACT We examine the effect of poroelastic boundary conditions when determining elastic properties fluid‐saturated porous rocks from forced‐oscillation laboratory experiments. One undesired yet often unavoidable complication in estimation undrained bulk modulus is due to presence so‐called dead volume. It implies that some fluid mass can escape rock sample under applying a confining pressure perturbation. Thus, volume compromises state required unambiguously determine modulus. In this...

In presented paper, we describe the technical and physical aspects of application a low-frequency (LF) apparatus based on longitudinal type forced oscillations. particular, investigate influence strain gauge position tested sample measurement results, also examine creep effect associated with mineralogy rocks, as well dispersion attenuation in liquid-saturated rock caused by presence volume pore fluid exterior to (dead volume). The gauges is investigated using cylindrical acrylic two pairs...

We present a new version of the low frequency laboratory apparatus operating at seismic frequencies and either confining or uniaxial pressures from 0 to 70 Mpa. The utilizes stress-strain technique measures complex Young’s modulus, extensional attenuation Poisson’s ratio rock sample range strain amplitudes between 10-6 10-8.

Abstract Studying the effects of solid pore fills on elastic properties rocks is significant importance for a range applications, such as, example, monitoring heavy oil reservoirs or modeling transport affected by salt precipitation cementation. We present results laboratory solid‐substitution experiments carried out Bentheim sandstone at seismic frequency 2 Hz. The were performed when space tested sample was filled sequentially with (23°C) and liquid (40°C) octadecane. Previously,...

A study of pore fluid effects on the elastic and anelastic properties sedimentary rocks is important for seismic data interpretation monitoring movement during hydrocarbon extraction in producing fields. significant portion world's reserves are found limestone reservoirs. An understanding essential to characterize these reservoirs accurately. We present results lowfrequency (0.1 – 120 Hz) laboratory measurements dry water-saturated Savonnieres oolitic (permeability 3.2 mD, porosity 29%)...

In recent decades, low-frequency (LF) experiments based on the forced-oscillation (FO) method have become common practice in many rock physics laboratories for measuring elastic and anelastic properties of rocks. However, use electronic displacement sensors traditional acquisition systems FO devices such as conventional capacitive transducers or strain gauges seriously limits both efficiency productivity LF measurements, and, due to limited contact area with a sample under test, increases...