Acoustic behavior of sedimentary rocks: Geologic properties versus Poisson's ratios

The equivalent pore aspect ratio as a tool for pore type prediction in carbonate reservoirs

“…The acoustic properties of carbonate reservoirs at core analysis or wireline log sampling resolution are largely controlled by pore space architecture that is structured by depositional processes and by the subsequent diagenetic modification of the sediment (e.g. Anselmetti and Eberli, 2001;Eberli et al, 2003;Kenter et al, 2007). In addition, the seismic expression of carbonates is strongly driven by the 3D distribution of elastic properties at larger scale (~1-100m [~3-300 ft]) that results from the depositional/stratigraphic architecture of the carbonate system and from its diagenetic evolution (Fournier and Borgomano, 2007).…”

Ultrasonic logging across unconformities — outcrop and core logger sonic patterns of the Early Triassic Middle Buntsandstein Hardegsen unconformity, southern Germany

“…average relationship (Wyllie et al, 1956) and the slightly modified equations of Gardner et al (1974) and Raymer et al (1980). Only in quartz dominated sandstones, these equations provide a very reliable, almost linear P-wave velocity to porosity relation (Han et al, 1986;Vernik and Nur, 1992;Dvorkin and Nur, 1998), but they generally over-estimate porosities (Brereton and McCann, 1990) and fail to predict the porosity in polymineral datasets (Kenter et al, 2007). According to Kenter et al (2007), the influence of mineralogy on the absolute value of P-wave velocity is most important when intermediate porosities of 10-25% are considered.…”

Pore pressure prediction using geophysical methods in carbonate reservoirs: Current status, challenges and way ahead

“…Rock physics models considering the pore structure effects More powerful rock physics models are the key to solve the PP prediction problem in carbonates. Many recent experiment studies show that the mineral composition (Scotellaro et al, 2007;Kenter et al, 2007), pore structure (Anselmetti and Eberli, 1993;Assefa et al, 2003;Weger et al, 2009;Wang et al, 2015), and frame texture (Verwer et al, 2008) can be important factors of carbonate velocity variation. But researchers presently have no consistent findings.…”