INTERPOLATION_TYPE

TIME_SERIES / INTERPOLATION_TYPE

New in v8.1, previously known as RATE_INTERPOLATION_TYPE that was renamed to INTERPOLATION_TYPE.

Description

Caution

Only valid for CSV data of source MISCELLANEOUS. For TIME_SERIES of TYPE DEFAULT the keyword is not allowed as input. The following applies:

• MISCELLANEOUS: Interpolation type is mandatory.
• DEFAULT: Interpolation type not allowed. Default RIGHT is used.

Caution

Different data types may require different types of interpolation. While reservoir rates are typically interpolated RIGHT or LEFT, other data such as pressure is often interpolated linearly (LINEAR). Data that should be interpolated differently must be specified in different input files, as it is not possible to have multiple interpolation types for vectors within the same file.

Rates are given at defined time steps in the data source but are in essence valid for a time interval. The INTERPOLATION_TYPE will determine how rates are interpolated between the given time steps.

• LEFT: The rate given at the current time step is defining the rate in the time interval between the current and previous time step. This is in data science also known as backwards filling of missing values.
• RIGHT: The rate given at the current time step is defining the rate in the time interval between the current and next time step. This is in data science also known as forward filling of missing values.
• LINEAR: The rate will be linearly interpolated between the time steps.

The plot below shows how the different choices for INTERPOLATION_TYPE works in practice.

Format

INTERPOLATION_TYPE: <LEFT/RIGHT/LINEAR>

Requirements

INTERPOLATION_TYPE has to be specified if TYPE is set to MISCELLANEOUS.

INTERPOLATION_TYPE can not be specified if TYPE is set to DEFAULT.

Example

See the TIME_SERIES time_series_format.