Characterization of fracture networks for fluid flow analysis
The analysis of fluid flow through fractured rocks is difficult because the only way to assign hydraulic parameters to fractures is to perform hydraulic tests. However, the interpretation of such tests, or ''inversion'' of the data, requires at least that we know the geometric pattern formed by the fractures. Combining a statistical approach with geophysical data may be extremely helpful in defining the fracture geometry. Cross-hole geophysics, either seismic or radar, can provide tomograms which are pixel maps of the velocity or attenuation anomalies in the rock. These anomalies are often due to fracture zones. Therefore, tomograms can be used to identify fracture zones and provide information about the structure within the fracture zones. This structural information can be used as the basis for simulating the degree of fracturing within the zones. Well tests can then be used to further refine the model. Because the fracture network is only partially connected, the resulting geometry of the flow paths may have fractal properties. We are studying the behavior of well tests under such geometry. Through understanding of this behavior, it may be possible to use inverse techniques to refine the a priori assignment of fractures and their conductances such that we obtain the best fit to a series of well test results simultaneously. The methodology described here is under development and currently being applied to several field sites. 4 refs., 14 figs.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 6200769
- Report Number(s):
- LBL-26868; CONF-8806169-3; ON: DE89013423
- Resource Relation:
- Conference: 4. annual Canadian/American conference on hydrogeology, Banff, Canada, 22 Jun 1988; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
Similar Records
Quantitative Characterization of Impacts of Coupled Geomechanics and Flow on Safe and Permanent Geological Storage of CO2 in Fractured Aquifers
Geophysical System for Fluid Flow and Fracture Imaging
Related Subjects
FLUID FLOW
FRACTURE MECHANICS
DATA ANALYSIS
FLOW MODELS
FRACTURES
GEOPHYSICAL SURVEYS
HYDRAULICS
ROCK MECHANICS
WELL LOGGING
FAILURES
FLUID MECHANICS
MATHEMATICAL MODELS
MECHANICS
SURVEYS
580300* - Mineralogy
Petrology
& Rock Mechanics- (-1989)
580100 - Geology & Hydrology- (-1989)