Fractured reservoir detection and evaluation using well test analysis
Interpretation models used in well test analysis for fractured reservoir identification and evaluation are based on the fluid flow behavior of heterogeneous reservoirs. Conventional techniques for fracture detection include use of well logs, seismic surveys, cores, and petrophysics. The main objective of this study was the identification of fissured formations through the analysis and interpretation of data coming from well tests (e.g., drill-stem, wireline and production tests; buildup, interference, pressure, and flow-rate measurements; etc). A geological model has been prepared for a fractured western Venezuelan reservoir where the analysis of pressure and production data confirms the existence of natural fractures. One important conclusion derived from this study is that the identification and evaluation obtained from well test analysis interpretation corresponds to the geological setting associated with the drainage volume wherein the wells under study are completed. The reservoir description obtained can be added to the geological model of the zone; particularly useful are those where there is no core or drilling evidence of fissures probably because the well is complete in the matrix. One important aspect when dealing with these type of reservoirs is the location of reserves (in the fissures, the matrix, or a combination). This determination is a controversial issue, especially during exploration where the evaluation commonly is based only on logs, outcrops, cores, and information from drilling.
- OSTI ID:
- 6683387
- Report Number(s):
- CONF-880301-
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
DEVELOPING COUNTRIES
EXPLORATORY WELLS
FLUID FLOW
FLUIDS
FRACTURED RESERVOIRS
GEOLOGIC DEPOSITS
GEOLOGIC FAULTS
GEOLOGIC FRACTURES
GEOLOGIC MODELS
GEOLOGIC STRUCTURES
GEOPHYSICS
HYDROLOGY
LATIN AMERICA
MINERAL RESOURCES
NATURAL GAS DEPOSITS
PETROLEUM DEPOSITS
RESERVOIR FLUIDS
RESOURCES
SOUTH AMERICA
TESTING
VENEZUELA
WELL LOGGING
WELLS