5 research outputs found
The possibilities of well logging data methods for studying fracturing
This article covers the main methods of geophysical well studies aimed at studying fractured zones. Examples of the results of a quantitative evaluation of fracture parameters and examples of their use when working with seismic data and constructing hydrodynamic models are given. The emphasis is made on the need for a cross-cutting technology to study the type of pore space from seismic data, geological and technological studies, core, geophysical studies of wells, field geophysical studies, hydrodynamic studies
A sol-gel synthesis and gas-sensing properties of finely dispersed ZrTiO4
The transparent titanium-zirconium-containing gel was obtained using heteroligand coordination compounds (namely, alkoxoacetylacetonates) as the precursors. The high-dispersive system “ZrTiO4 – carbon” formed after drying of such gel and carbonization of the obtained xerogel, was used to study the evolution of microstructure for the product (ZrTiO4) during thermal treatment in air for 1 h in the temperature range from 500 °C to 1000°С. It was stated that the formation of crystalline phase occurred in the narrow range 690-730°С. The thermal treatment at 500 °C and 600°С allowed obtaining micro- and mesoporous X-ray amorphous products of the composition ZrTiO4, with the specific surface area falling in the range 82–150 m2/g. At the higher temperatures the single-phase nanocrystalline powder was prepared (the specific surface area amounted to 2.5–15 m2/g). Particle coarsening took place more extensively at temperatures ≥700°С was shown. For the ZrTiO4 nanopowder crystallized under the mildest conditions at the temperature of 700 °C, chemoresistive gas-sensitive properties were studied for the first time. The material showed a high reproducible response at 1–20% O2 and 200–10,000 ppm H2 at a relatively low detection operating temperature of 450 °C. © 2019 Elsevier B.V