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Abstract

One essential ingredient for proper reservoir description is a data base of reservoir rock and fluid sample analyses. Without direct access to rock and fluid sample data, geologists, geophysicists, engineers, geostatisticians, and managers are forced to rely mostly on remotely accessed information supplied by well logs and seismic reflection profiles. Rock and fluid data provide a means of assessing the quality of other forms of subsurface data. This part of the Manual provides a handy reference guide to standard laboratory methods for analyzing rock and fluid samples from hydrocarbon reservoirs. It is divided into five topic areas:

  1. Core description

  2. Core analysis

  3. Paleontology

  4. Petrographic analysis

  5. Chemistry of fluids

A single chapter that describes methods for examining and recording lithological data from continuous cores (Ethridge) comprises the first topic area. This procedure represents an essential first step in analysis of continuous core and is critical to core-log depth adjustment and to construction of depositional models.

The second topic area begins with a general overview chapter on routine core analysis (Almon). Other chapters on this topic discuss porosity (Cone and Kersey), permeability (Ohen and Kersey), core-log transformations and porosity-permeability relationships (Nagel and Byerley), wettability (Funk), capillary pressure (Vavra, Kaldi, and Sneider), and relative permeability (Hawkins).

A single chapter on paleontology (Scott) describes the use of fossils in dating and correlating strata and in predicting reservoir and source rocks. The topic of petrographic analysis includes papers on thin section methods (Houseknecht) and X-ray diffraction, cathodoluminescence, and X-ray fluoroscopy (Thomas).

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