Anordning og fremgangsmåte for bergartsgeofysiske undersökelser av en bergartspröve

摘要

The invention relates to a pressure cell for petrophysical examination of a cylinder-shaped oil-bearing rock sample (3). The cell comprises: a cylinder­shaped fiber reinforced pressure mantle (7) with end portions (7a,7b) and caps (2a,2b); a pressurising channel (12) through the caps (2a,2b) from a pump (122) for pressurising by means of a pressurising fluid (124) in a space inside the pressure mantle (7); a rubber sleeve (131) enveloping the sample's (3) cylinder surface against the pressurising fluid (124); flow channels (13a, 13b) through the caps (2a,2b) with an injection flow pump (132) for flowing flow gas (134) through the rock sample's (3) end surfaces (38a,38b) and within the rubber sleeve (131) to a receiving flow pump (136). The novel features of the invention comprise the following features: acoustic transducers (14a) arranged in either end (38a,38b) of the rock sample (3) for generating and reception respectively of P (pressure) and S (shear) waves; a circumferential central portion (7c) of the pressure mantle (7) being transparent to X-rays (81); so as to conduct simultaneous CT-X-ray examination of gas content and gas distribution after flowing of the flow gas (134} through the rock sample (3), for examining the rock sample's seismic properties under various pressures from the pressurising fluid (124) and gas content of the flow fluid (134) or degree of oil content.