Effects of microporosity on sonic velocity in carbonate rocks

Characterization of Pore Geometry of Indiana Limestone in Relation to Mechanical Compaction

“…6). Using a linear interpolation scheme, the local porosity in this domain can be inferred and in agreement with previous microstructural observations on carbonate rocks (Baechle et al, 2008;Zhu et al, 2010). The cumulative microporosity in this intermediate domain was estimated to be more than half of the total porosity in Indiana limestone (Tab.…”

“…Recent studies have demonstrated that the macropores and micropores exert distinctly different influences on the elastic (Baechle et al, 2008;Knackstedt et al, 2009) and inelastic (Zhu et al, 2010;Vajdova et al, 2010) behaviors of limestone and accordingly realistic modeling of the micromechanics would require a dual porosity model. Although most of the micropores can be readily resolved under the SEM, the quantitative characterization of a statistically representative sample of these fine features can be tedious.…”

Using synchrotron X-ray microtomography to characterize the pore network of reservoir rocks: A case study on carbonates

“…In general, the mechanics of these rocks is assessed using dual porosity models. These models take into account that the two classes of pores have fundamentally different influences on the elastic properties [54,55] and compaction [4,56] of porous limestones. Indeed, inelastic compaction develops by macropore collapse, but the micropores control the damage in the vicinity of macropores [49].…”

Investigation of pore-type heterogeneity and its inherent genetic mechanisms in deeply buried carbonate reservoirs based on some analytical methods of rock physics

“…However, this prediction is complicated in practice due to the inherent scatter in porosityevelocity and porosityepermeability relationships. This scatter is partly attributed to the heterogeneity of carbonate reservoirs, which results from different depositional environments and a varied diagenetic history (Anselmetti and Eberli, 1993;Baechle et al, 2008;Fournier and Borgomano, 2009;Kenter et al, 2002Kenter et al, , 1997Weger et al, 2009). Carbonate reservoir heterogeneity is often related to the diversity of pore structures and pore types, which has been identified as the crucial parameter needed to resolve the scatter in seismic and petrophysical relationships.…”