Elastic properties of microporous cemented grainstones

Fournier, François; Léonide, Philippe; Biscarrat, Kévin; Gallois, Arnaud; Borgomano, Jean; Foubert, Anneleen

doi:10.1190/gpysa7.76.e175_1

Cited by 37 publications

(70 citation statements)

References 49 publications

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“…The comparison between acoustic velocities in travertines and in marine carbonates examined by Fournier et al (2011Fournier et al ( , 2014 shows remarkable differences (Fig. 15).…”

Section: Discussionmentioning

confidence: 85%

“…15). The data of Fournier et al (2011) contains more than 70 tightly cemented Cretaceous carbonate grainstones from Provence (south-east France). The samples consist of calcite and are microporous (0.5e25.5%).…”

Section: Discussionmentioning

confidence: 99%

“…214 platform carbonates from SE France in Fournier et al (2014) contain macroporosity and microporosity (0.1e23.1%). The travertines contain vast amounts of macropores and exhibit, just like macroporous marine carbonates (Fournier et al, 2014), higher velocities when compared to the microporous grainstones (Fournier et al, 2011). For porosities <12%, the travertines fall in a similar velocity range as mouldic, vuggy and intergranular macropores in marine carbonates (Fournier et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

“…Their model allows predicting pore type occurrences. The travertine dataset and the dataset from Fournier et al (2011) are plotted alongside marine carbonates of Weger et al (2009), Anselmetti and Eberli (1993) and Eberli et al (2003). Figure 16 shows trend lines for compressional-wave velocities of the aforementioned datasets, in their respective porosity ranges.…”

Section: Discussionmentioning

confidence: 99%

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Acoustic properties in travertines and their relation to porosity and pore types

Soete

Kleipool

Claes

et al. 2015

Marine and Petroleum Geology

105

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Sonic velocities of Pleistocene travertines were measured under variable confining pressures. Combined with petrographical characteristics and petrophysical data, i.e. porosity, permeability and density, it was determined that travertine porosity, pore types and cementation control compressional-wave (V p ) and shear-wave velocity (V s ). At 40 MPa confining pressures, V p ranges between 3695 and 6097 m/s and V s between 2037 and 3140 m/s. Velocity variations in travertines are, as with all carbonates, primarily linked to sample heterogeneity, i.e. differences in fabric, texture and porosity. They thus not necessarily emanate from changes in mineralogy or composition. Body wave velocities have a positive correlation with sample density and an inverse correlation with porosity. The travertines, sampled in extensional settings with normal faulting activity, define a specific compressional-wave velocity (y-axis) versus porosity (x-axis) equation, i.e. (log(y) ¼ À0.0048x þ 3.7844) that differs from the V p -porosity paths defined by marine carbonates. Acoustic wave velocities are higher for travertines than for marine carbonates. Travertine precipitates form rigid rock frames, often called framestone, with large primary pores. Marine carbonates on the other hand often consist of (cemented) transported sediments, resulting in a rock frame that permits slower wave propagation when compared to the continental limestones.Acoustic velocity variations are linked to variations in pore types. Mouldic pores (macropores) show faster wave propagation than expected from their total porosities. Microporosity, interlaminar and interpeloidal porosity result in slower acoustic velocities. Framework pores and micro-moulds are associated with lowered acoustic velocities, while vug porosity is found above, on and below the general velocity-porosity trend. Not only the pore type, but also pore shapes exert control on body wave velocities. Cuboid-and rod-like pore shapes increase the velocity, while plate-and blade-like pore shapes have a negative effect on the velocity. The study demonstrates how seismic sections in travertine systems can contain seismic reflections that are not caused by non-carbonate intercalations, but relate to geobody boundaries, in which the seismic expression is function of porosity, pore types and shapes. This study provides and relates petrophysical data, i.e. porosity, permeability and acoustic velocities of travertines and is of importance for the interpretation of seismic reflection data in subsurface continental carbonate reservoirs.

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“…The comparison between acoustic velocities in travertines and in marine carbonates examined by Fournier et al (2011Fournier et al ( , 2014 shows remarkable differences (Fig. 15).…”

Section: Discussionmentioning

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Acoustic properties in travertines and their relation to porosity and pore types

Soete

Kleipool

Claes

et al. 2015

Marine and Petroleum Geology

105

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“…Recent publications highlight improvements in porosity prediction (Ras et al 2012;Emang et al 2013) and resolution of diagenetic overprints (Maranu et al 2013). These efforts are complemented by forward seismic modelling of depositional and diagenetic heterogeneities based on seismicscale carbonate reservoir analogues (Schwab et al 2005;Goldberg et al 2010;Fournier et al 2011). Toullec et al (2012) emphasized that changes in the seismic signal do not necessarily correspond directly to sequence boundaries and unconformities.…”

Section: Selected Advancesmentioning

confidence: 99%

Fundamental controls on fluid flow in carbonates: current workflows to emerging technologies

Agar

Geiger

2014

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The introduction reviews topics relevant to the fundamental controls on fluid flow in carbonate reservoirs and to the prediction of reservoir performance. The review provides research and industry contexts for papers in this volume only. A discussion of global context and frameworks emphasizes the value yet to be captured from compare and contrast studies. Multidisciplinary efforts highlight the importance of greater integration of sedimentology, diagenesis and structural geology. Developments in analytical and experimental methods, stimulated by advances in the materials sciences, support new insights into fundamental (pore-scale) processes in carbonate rocks. Subsurface imaging methods relevant to the delineation of heterogeneities in carbonates highlight techniques that serve to decrease the gap between seismically resolvable features and well-scale measurements. Methods to fuse geological information across scales are advancing through multiscale integration and proxies. A surge in computational power over the last two decades has been accompanied by developments in computational methods and algorithms. Developments related to visualization and data interaction support stronger geoscience-engineering collaborations. High-resolution and real-time monitoring of the subsurface are driving novel sensing capabilities and growing interest in data mining and analytics. Together, these offer an exciting opportunity to learn more about the fundamental fluid-flow processes in carbonate reservoirs at the interwell scale.

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Acoustic and reservoir properties of microporous carbonate rocks: Implication of micrite particle size and morphology

et al. 2015

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This integrated study provides significant insight into parameters controlling the acoustic and reservoir properties of microporous limestones, improving the knowledge of the relationships among petrophysic and microstructural content. Petrophysical properties measured from laboratory and logging tools (porosity, permeability, electrical conductivity, and acoustic properties) have been coupled with thin section and scanning electron microscope observations on the EST205 borehole from the Oxfordian limestone aquifer of the eastern part of the Paris Basin. A major achievement is the establishment of the link between micrite microtexture types (particle morphology and nature of intercrystal contacts) and the physical response, introducing a new effective and interesting rock-typing approach for microporous reservoirs. Fluid-flow properties are enhanced by the progressive augmentation of intercrystalline microporosity and associated pore throat diameter, as the coalescence of micrite particles decreases. Concerning acoustic properties, the slow increase of P wave velocity can be seen as a reflection of crystal size and growing contact cementation leading to a more cohesive and stiffer micrite microtexture. By applying poroelasticity theory on our samples, we show that velocity dispersion can be a very useful tool for data discrimination in carbonates. This dispersion analysis highlights the presence of microcracks in the rocks, and their overall effect on acoustic and transport properties. The presence of microcracks is also confirmed with observations and permeability measurements under high confining pressure. Finally, a possible origin of high porous levels in neritic limestones is a mineralogical transformation of carbonates through freshwater-related diagenesis during subaerial exposure time. Finally, by applying poroelasticity theory on our samples, we show that velocity dispersion can be a very useful tool for data discrimination in carbonates.

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Elastic properties of microporous cemented grainstones

Cited by 37 publications

References 49 publications

Acoustic properties in travertines and their relation to porosity and pore types

Acoustic properties in travertines and their relation to porosity and pore types

Fundamental controls on fluid flow in carbonates: current workflows to emerging technologies

Acoustic and reservoir properties of microporous carbonate rocks: Implication of micrite particle size and morphology

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