Georesursy (Sep 2018)
Use of induced acoustic emission of reservoirs for the detection and recovery of hydrocarbons
Abstract
The results of a study of seismoacoustic emission appearing in a saturated porous geological environment with forced acoustic impact on cores and in wells are presented. It is shown that the wave action effectively influences the increase in permeability relative to the initial value and the acoustic emission of a saturated porous medium caused by the wave action serves as a reliable source of information on its reservoir roperties. The hydrostatic pressure gradient contributes to the acoustic emission mechanism, which creates fluid filtration. In this case, the greater the core permeability, the wider the emission frequency band, the smaller the permeability, the narrower the band of the spectrum, which approaches the form of a discrete set of frequencies. Similar data were obtained in oil reservoirs, where a continuous spectrum is characteristic of porous sandstones of terrigenous reservoirs, and single narrow-band spectra, for fractured carbonate reservoirs. The principle of excitation of high-intensity waves of elastic energy and registration of waves of emission origin in the reservoir provides reliable information on reservoir productivity in both perforated well and non-perforated well, and can give recommendations on the selection of the perforation interval and also stimulate the inflow of oil from the reservoir.
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