Carbonate reservoir characterization : an integrated by F. Jerry Lucia

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 may enhance functionality predictions through fluid-flow computing device simulations. Lucia’s publication specializes in the development of geological, petrophysical, and geostatistical equipment, describes the fundamental petrophysical houses, very important geology parameters, and rock materials from cores, and discusses their spatial distribution. A ultimate bankruptcy bargains with reservoir versions as an enter into move simulators.

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This tool allows a number of pressures to be taken from selected intervals, thus providing data to determine reservoir gradients. This data can be used to define zcp levels and define reservoir compartments (Fig. 15). Fig. 15. Diagram illustrating the use of pressure gradients to define reservoir compartments and water levels. (A) Depth plot of pressure from wells 1 and 2 shown in (B). Intersections of depth plots with the regional fluid-pressure gradient are at depths d1 and d2, suggesting separate reservoirs with different water-oil contacts.

Figure 21a illustrates this principle. Permeability of a moldic grainstone is less than would be expected if all the total porosity were interparticle and, at constant porosity, permeability increases with decreasing separate-vug porosity (Lucia and Conti 1987). The same is true for a large crystalline dolowackestone (Fig. 21b) in that the data plot to the left of the class 1 field in proportion to the separate-vug porosity (Lucia 1983).

G) Large crystalline dolowackestone. 4 Rock-Fabric/Petrophysical Relationships 45 Fig. 12. Porosity-air permeability cross plots of nonvuggy dolostone fabrics compared with the three permeability fields illustrated in Fig. 6. (a) Muddominated dolostones with dolomite crystal sizes ranging from 10 to 500 microns. (b) Dolograinstones (average grain size is 200 microns) with dolomite crystal sizes ranging from 15 to 150 microns. (c) Grain-dominated dolopackstones with fine to medium dolomite crystal sizes from Dune field, Permian Basin, and the large crystalline dolograinstone from an outcrop on the Algerita Escarpment, New Mexico, all plot within the >100-micron permeability field.

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