Resistivity logging of fractured basalt
A lumped double porosity model was studied in order to estimate the effect of fractures on resistivity - porosity relations. It is found that the relationship between resistivity and porosity for fractured rock is in general not simple and depends both on the amounts of matrix porosity as well as the fracture orientation. However, when fractures dominate over matrix porosity the exponent is close to 1.0. Resistivity-porosity relations have been determined for large amounts of basaltic formations in Iceland. An exponent close to 1.0 is found in all cases investigated. This is interpreted as fractures constitute a considerable part of the porosity of the basalts. In the IRDP-hole in Eastern Iceland it is found that the ratio of fracture porosity to total porosity decreases with depth.
- Research Organization:
- Orkustofnun, Reykjavik, Iceland
- OSTI ID:
- 7369540
- Report Number(s):
- SGP-TR-60; CONF-821214-27; ON: DE83015865
- Resource Relation:
- Conference: 8. geothermal reservoir engineering workshop, Stanford, CA, USA, 14 Dec 1982; Related Information: In: Proceedings of the eighth workshop on geothermal-reservoir engineering, by
- Country of Publication:
- United States
- Language:
- English
Similar Records
Petrophysical properties of the Monterey formation and fracture detection from the sonic log
Practical method for determining cementation exponents and some other parameters as an aid in well log analysis. [In making volumetric estimates of hydrocarbon reserves]
Related Subjects
BASALT
RESISTIVITY LOGGING
FRACTURED RESERVOIRS
BOREHOLES
GEOTHERMAL SYSTEMS
ICELAND
MATHEMATICAL MODELS
POROSITY
CAVITIES
DEVELOPING COUNTRIES
ELECTRIC LOGGING
EUROPE
IGNEOUS ROCKS
ISLANDS
ROCKS
VOLCANIC ROCKS
WELL LOGGING
WESTERN EUROPE
Geothermal Legacy
150303* - Geothermal Exploration & Exploration Technology- Exploratory Drilling & Well Logging