Petrophysical analysis performed on the data obtained through the wireline logs. Crains petrophysical handbook capillary pressure pc. Theory and practice of measuring reservoir rock and fluid transport properties, fourth edition provides users with tactics that will help them understand rockfluid interaction, a fundamental step that is necessary for all reservoir engineers to grasp in order to achieve the highest reservoir performance the book brings the most comprehensive coverage on the subject matter, and. Thus if pc is measured in the lab and sigma is known, equation 12 can be rearranged to give pore throat radius r.
The common issue arising in the petrophysical analysis due to. Introduction of a pore geometrical factor defined by. Pdf development of a modified capillary pressure jfunction. The jfunction was developed in an attempt to obtain a dimensionless function to average core capillary pressure curves to obtain the most representative curve. In petroleum engineering, the leverett jfunction is a dimensionless function of water saturation describing the capillary pressure. Capillary pressure,petrophysics lecture 4, petroleum. Petrophysical characterization of a lower cretaceous carbonate. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. The capillary pressure jfunction is a dimensionless measure of the capillary pressure of a fluid in a porous medium. Print to pdf email progression map browse sessions in this discipline.
Saturation height methods and their impact on volumetric. The capillary pressure jfunction is a dimensionless measure of the capillary. Thus, it can be generally applied to both clastic and. Application of flow zone indicator and leverett jfunction to. The classic method is based on leveretts j function approach 5. The function was derived based on a capillary bundle model. The leverett jfunction is an attempt at extrapolating capillary pressure data for a given rock to rocks that are similar but with differing permeability, porosity and wetting properties. Pdf modeling of capillary jfunction for heterogeneous reservoirs. Petrophysical properties that are closely linked to pore geometry are quantified by invoking both leveretts j function and thomeers gfactor. Pdf capillary pressure curves are represented by the equation pca sw swi b. Development of a modified capillary pressure jfunction. However, the dependence of the jfunction on the saturation sw is not well understood. Pdf capillary pressure curves are represented by the equation pca sw swib.
The new log attribute is based on standard welllog analysis and only requires conventional well logs for its application. Dens density difference between the wetting and nonwetting. The jfunction, however, does not result in a single correlation. Capillary pressure is the difference in fluid pressure across an interface between two fluids in a confined volume. Principles of mathematical petrophysics request pdf. However, the dependence of the j function on the saturation s w is not well understood. Other commonly used methods in the ukcs include johnson 6, cuddy et al. In the discussion of capillary pressure, we will first examine surface energy and wettability, and then go on to derive a general expression for capillary pressure. Water saturation, calculated by using the leverett jfunction method.
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