Abstract
Permeability characterizes the ability of rocks to store and transport natural gas, crude oil and reservoir fluids. Permeability heterogeneity of reservoir rocks, including dolomites, results from overlapping geological and physicochemical processes. The permeability study of gas-bearing dolomites was carried out on the Lubiatów hydrocarbon deposit (Poland), located at the Ca2 carbonate platform toe-of-slope, which is a prospective area for hydrocarbon exploration in Europe. Due to the complicated rock textures and overlapping alteration processes, including secondary crystallization or dissolution of minerals, the permeability of the deposit is variable. Studies of dolomites from a depth of 3242–3380 m show high mineralogical diversity; the percentage of dolomite ranges from 79% to 95% with a variable content of other minerals: anhydrite, gypsum, quartz, fluorite, plagioclase and clay minerals. The porosity variability ranges from 4.69% to 31.21%, depending on the measurement method used. The mean permeability value is 35.27 mD, with a variation range of 0.9 to 135.6 mD. There is neither change in permeability with depth and mineral composition, nor a direct relationship between porosity and permeability.
Highlights
Permeability is one of the most important petrophysical parameters of reservoir rocks for hydrocarbon accumulations, determining the feasibility of their extraction
Permeability quantification of reservoir rocks is important from the point of view of forecasting its changes resulting from drilling techniques for deposit completion and intensification of hydrocarbon extraction
At a depth of several thousand meters, such as limestone, dolomite, sandstone and shale, which are characterized by very low permeabilities, the permeability quantification consists practically in determining the value relative to other rock characteristics, determined pointwise or indirectly
Summary
Permeability is one of the most important petrophysical parameters of reservoir rocks for hydrocarbon accumulations, determining the feasibility of their extraction. Permeability characterizes the ability of rocks to store and transport natural gas, crude oil and reservoir fluids. Permeability quantification of reservoir rocks is important from the point of view of forecasting its changes resulting from drilling techniques for deposit completion and intensification of hydrocarbon extraction. At a depth of several thousand meters, such as limestone, dolomite, sandstone and shale, which are characterized by very low permeabilities, the permeability quantification consists practically in determining the value relative to other rock characteristics, determined pointwise or indirectly. Sedimentation, diagenesis and tectonic movements all play roles in the formation of carbonate reservoirs, the storage space of which is composed of pores, vugs and fractures of different scales [2,3,4,5]
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