The influence of sample size and permeability distribution upon heterogeneity measures

Conference · Wed Jan 01 04:00:00 EST 1986

OSTI ID:6975292

Jensen, J L; Lake, L W

This study evaluates the influence of sample size upon the Dykstra-Parsons and Lorenz measures of heterogeneity. Since either coefficient is determined for a reservoir from a finite number of data, only an estimate is made of the true coefficient. The authors show that, on average, the estimate is less than the true value. They give the relationship between estimate error and sample size, and show how significant errors may arise when too few data are used. The influence of the permeability distribution upon heterogeneity measures is also studied. The author shows that a variety of distributions, exhibiting different reservoir performance, can have the same Dykstra-Parsons coefficient. The authors propose a heterogeneity measure which includes an indication of the permeability distribution. The new measure requires fewer data than Dykstra-Parsons estimator. The relationships between the new measure and the Dykstra-Parsons and Lorenz coefficients are given.

• Research Organization: Heriot-Watt Univ.
• OSTI ID: 6975292
• Report Number(s): CONF-861080-
• 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
DATA ANALYSIS
ERRORS
GEOLOGIC DEPOSITS
HETEROGENEOUS EFFECTS
MEASURING METHODS
MINERAL RESOURCES
NATURAL GAS DEPOSITS
PERFORMANCE
PERMEABILITY
PETROLEUM DEPOSITS
RESERVOIR ROCK
RESOURCES
SAMPLING
SIZE