By F. Jerry Lucia
F. Jerry Lucia, operating in America’s major oil-rich nation, has produced a piece that is going after one of many holy grails of oil prospecting. One major aim in petroleum restoration is the outline of the 3-dimensional distribution of petrophysical homes at the interwell scale in carbonate reservoirs. Doing so could enhance functionality predictions through fluid-flow laptop simulations. Lucia’s publication makes a speciality of the development of geological, petrophysical, and geostatistical tools, describes the fundamental petrophysical homes, very important geology parameters, and rock materials from cores, and discusses their spatial distribution. A final bankruptcy offers with reservoir versions as an enter into circulation simulators.
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Additional info for Carbonate Reservoir Characterization: An Integrated Approach
The above equation is plotted in Figure 16 and compared with the petrophysical-class fields described in this report. It is apparent that Pittman’s relationship between pore-throat size, porosity, and permeability does not conform to the petrophysical classes defined in this classification. It is also apparent that, within a petrophysical class, pore-throat size decreases as interparticle porosity decreases. The eight basic rock fabrics defined here are constrained to specific petrophysical-class fields and not to a specific pore-throat size.
The relationships between relative permeability and saturation obtained by these two methods are commonly very different. A third method that is rapid and less expensive is to measure effective permeabilities at irreducible water and residual oil. This is called the end point method, and it assumes that a reasonable estimate of the curvature can be made. A significant problem in measuring relative permeability in the laboratory is restoring samples to reservoir conditions. Pore surfaces, especially in carbonate rocks, are reactive to changes in fluids, and these reactions can alter the wettability state.
Thus, dolomitization of a mud-dominated carbonate fabric can result in an increase in particle size from <20 microns to >200 microns and the increase in dolomite crystal size results in a proportional increase in pore size (Fig. 11 E-H). The cross-plot of interparticle-porosity and permeability (Fig. 12a) illustrates the principle that, in mud-dominated fabrics, permeability increases as dolomite crystal size, and resulting pore size, increases. Finely crystalline (average 15 microns) mud-dominated dolostones from Farmer and Taylor Link fields (Lucia and Kerans 1992) in the Permian Basin and from Choquette and Steiner (1985) plot within the <20 micron permeability field.