Stability of fluid permeability of volcanogenic reservoirs under deformation
Abstract
The implemented research is relevant because in some cases the developing peculiarity of hard-to-recover reserves (HTR) fields is associated with the fact that the hydrocarbon content here is confined to unconventional – carbonate reservoirs and volcanic sediments. This group of reservoirs differs from traditional, terrigenous (sandy) reservoirs by a significant content of volcanic material, which changes the filtration-capacity properties of oil-containing reservoirs. The main objective of this study is summarizing the data on the mechanical properties of volcanic rocks, potential oil and gas reservoirs, with the identification of the stability conditions of the porosity and permeability properties of hydrocarbon-containing volcanic reservoirs during development of deposit. Methods. Most of the factual material on the deformation of carbonate reservoirs and volcanic obtained on a unique experimental device at the University of Strasbourg (France, Institute Terre & Environment de Strasbourg (ITES)). In this device, all-round hydrostatic pressure provided with simultaneous axial deformation. The maximum all-round and pore pressure is 200 MPa, and the axial load is 400 MPa. Results. Due to the generalization and existing data comparison follows that in terms of compressive strength (Ucs) all the studied tuffs are characterized by values of 29.6 MPa on average, which, according to the Deere and Miller classification, corresponds to “weakly strongˮ environments (Ucs≥55.0–27.5 MPa). However between the selected groups ignimbrite tuffs, with average values of Ucs=11.18 MPa belong to “very weakly strongˮ matter (according to the Deere and Miller classification). The average values of flexural strength (Fts) in the tested tuffs are 3.87 MPa, although in the group of ignimbrite tuffs this figure is lower and equals 2.19 MPa. In terms of impact toughness (Dn), point load index (Is) and hardness (HB), the group of ignimbrite tuffs also has the lowest values – 3.15 MPa, 1.80 MPa and 4.58 kg/mm2, with average values for all tuffs being 7.36 MPa, 2.42 MPa and 16.44 kg/mm2, respectively.However, the group of ignimbrite tuffs demonstrated quite high rates of resistance to abrasive wear (Bsa=117.15 cm3/50 cm2), with an average for all tuffs equal to 72.57 cm3/50 cm2.
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