ISS Assessment of the Influence of Nonpore Surface in the XPS Analysis of Oil-Producing Reservoir Rocks
✍ Scribed by Vladimir Leon; Pedro G. Toledo; Y.Carolina Araujo
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 99 KB
- Volume
- 192
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
reservoir sandstone is silica and feldspar grains in point The application of X-ray photoelectron spectroscopy (XPS) to contact. Cement-forming minerals such as chemically preoil-producing reservoir rocks is new and has shown that pore cipitated carbonates and clays cover the pore surfaces and surface concentrations can be related to rock wettability. In the fill high-curvature pits. Thus, on fracturing a sandstone for preparation of fresh fractures of rocks, however, some nonpore XPS analysis some of the contact surface, that has not been surface corresponding to the connection regions in the rocks is in contact with reservoir fluids, is exposed to XPS. Mitchell created and exposed to XPS. To assess the potential influence of et al. ( 1 ) used laser ionization mass analysis ( LIMA ) and this nonpore surface in the XPS analysis of rocks here we use ion secondary ion mass spectroscopy ( SIMS ) to estimate the scattering spectroscopy (ISS), which has a resolution comparable
influence of this nonpore surface, however quantification to the size of the pores, higher than that of XPS, with an ion gun of He / at maximum focus. Sample charging effects are partially was not possible. We investigated these techniques in our eliminated with a flood gun of low energy electrons. All the ISS laboratory with the same results. Here, we use the ion scatsignals are identified by means of a formula which corrects any tering spectroscopy ( ISS ) technique which has a resolution residual charging on the samples. Three rock samples are analyzed comparable to the size of the rock's pore segments, higher by XPS and ISS. The almost unchanged ISS spectra obtained at than that of XPS. We use ISS ( 6, 7 ) with a He / gun at different points of a given sample suggest that the nonpore surface maximum focus. The insulating character of the rock samcreated in the fracture process is negligibly small, indicating that ples represents an important experimental problem. To re-XPS data, from a larger surface spot, represents the composition duce the sample charging effects, we use a flood gun of low of true pore surfaces. The significant changes observed in ISS energy electrons. Good quality spectra are then possible, spectra from different samples indicate that ISS is sample specific. although the scattered peak values of ion energy are still