Some applications of clay mineralogy to reservoir description
| Autor: | J. S. Archer, Andrew Hurst |
|---|---|
| Rok vydání: | 1986 |
| Předmět: |
Cement
Mineralogy 020101 civil engineering 02 engineering and technology 010502 geochemistry & geophysics 01 natural sciences 0201 civil engineering Diagenesis chemistry.chemical_compound Permeability (earth sciences) chemistry Geochemistry and Petrology Kaolinite Sedimentary rock Clay minerals Porosity Chlorite Geology 0105 earth and related environmental sciences |
| Zdroj: | Clay Minerals. 21:811-826 |
| ISSN: | 1471-8030 0009-8558 |
| Popis: | Study of sandstone diagenesis provides information about the origin, texture, distribution and composition of clay minerals, which in turn is used in reservoir description. Three examples of the use of clay mineralogy in reservoir description are given. (1) Kaolinite commonly forms pore-filling cements which are pervasive in specific sandstone intervals. It is shown that water-zone kaolinization homogenizes and lowers the porosity and permeability relative to the oil zone; in a reservoir model different Ø/Krelationships are defined above and below the oil-water contact. (2) An occurrence of chlorite in dish-structured horizons is shown to increase horizontal permeability and decrease formation resistivity. The sensitivity of the neutron porosity log to the chlorite cement reduces the usefulness of the log for porosity evaluation. Uncritical application of wireline logs to define reservoir parameters can give pessimistic reservoir evaluation. (3) Sand production can be related to wettability, which in turn is strongly influenced by clay mineralogy. A perforation strategy to minimize sand production may then be based on knowledge of the clay mineralogy of a reservoir. |
| Databáze: | OpenAIRE |
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