Well test analysis of naturally fractured reservoirs

Conference · Fri Mar 01 04:00:00 EST 1985 · Soc. Pet. Eng. AIME, Pap.; (United States)

OSTI ID:5163902

Aguilera, R

Methods are presented for matching observed pressure data during drawdown or buildup tests. The methods, illustrated with step by step examples, allow calculation of fracture transmissivity, storativity ratio, skin, size of matrix blocks, fracture porosity, fracture storage, and radius of investigation. The effect of matrix block shapes in the transition period has been investigated through the use of a stratum model, a model made out of cubes with spaces in between and a model made out of ''match sticks'' separated by two orthogonal fracture planes. Consideration has been given to a gradient flow model as well as unsteady state and pseudo steady state interporosity flow. Since many naturally fractured reservoirs are fault-related, the effect of single and intercepting sealing faults has been investigated. It is concluded that even after obtaining a match of observed pressure data, there is uncertainity with respect to calculated parameters. Consequently, a synergetic approach integrating geologic models, logs, cores and outcrops is the only sound procedure for evaluating naturally fractured reservoirs.

• Research Organization: Roberto Aguilera Consultants Ltd.
• OSTI ID: 5163902
• Report Number(s): CONF-830512-
• Conference Information: Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States) Journal Volume: SPE13663
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
FLOW MODELS
FLUIDS
FRACTURED RESERVOIRS
GEOLOGIC MODELS
GEOPHYSICS
MATHEMATICAL MODELS
PRESSURE MEASUREMENT
RESERVOIR FLUIDS
RESERVOIR PRESSURE
WELL LOGGING