Analysis of Chalk Petrophysical Properties by Means of Submicron-Scale Pore Imaging and Modeling
| Autor: | Dmitriy Silin, Velimir Radmilovic, Liviu Tomutsa |
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| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | SPE Reservoir Evaluation & Engineering. 10:285-293 |
| ISSN: | 1930-0212 1094-6470 |
| Popis: | Summary For many rocks of high economic interest such as chalk, diatomite, shale, tight gas sands, or coal, a submicron-scale resolution is needed to resolve the 3D pore structure, which controls the flow and trapping of fluids in the rocks. Such a resolution cannot be achieved with existing tomographic technologies. A new 3D imaging method based on serial sectioning, which uses the focused-ion-beam (FIB) technology, has been developed. FIB technology allows for the milling of layers as thin as 10 nm by using accelerated gallium (Ga+) ions to sputter atoms from the sample surface. After each milling step, as a new surface is exposed, a 2D image of this surface is generated, and the 2D images are stacked to reconstruct the 3D pore structure. Next, the maximum-inscribed-spheres (MIS) image-processing method computes the petrophysical properties by direct morphological analysis of the pore space. The computed capillary pressure curves agree well with laboratory data. Applied to the FIB data, this method generates the fluid distribution in the chalk pore space at various saturations. |
| Databáze: | OpenAIRE |
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