A representation, on a plane surface and at an established scale, of the physical features of a part or whole of the Earth's surface or of any desired surface or subsurface data, by means of signs and symbols, and with the means of orientation indicated.

Sometimes abbreviated to flooding surface, a surface exhibiting evidence of an abrupt increase in water depth, separating younger from older strata.

A widespread marine flooding surface that separates the underlying transgressive systems tract from the overlying highstand systems tract.

A mathematical measure of the centrality of a data set.

A mathematical method of finding a central value for a group of data.

A conceptual, three-dimensional construction of a reservoir or oil and gas field.

To produce a representation or a simulation of a problem.

The act of constructing a model.

The mean or expected value of the product formed by multiplying together a set of one or more variates or variables, each to a specified power.

An approach to performing risk analysis on any project with uncertain input data.

The sampling of uncertain data for use in Monte Carlo risk analysis or simulation.

The use of Monte Carlo risk analysis techniques to estimate the most probable outcomes from a model with uncertain input data and to estimate the validity of the simulated model.

Regression techniques that find relationships between two or more variables that have a complex (nonlinear) relationship.

A technique for determining the deviation of a wellbore.

Any model that incorporates more than one variable that is represented by fractal geometry or a fractal function.

A concept for advanced computer calculations developed by Alan Turing to mimic some of the operations of the neurons in a brain.

Mathematical methods that require iterative processing of data rather than applying deterministic equations.

A rendering of a model of a reservoir or field in entirely numerical formats.

The mathematical simulation of a numerical model of a reservoir's petrophysical characteristics to analyze and predict fluid behavior in the reservoir over time.

A characteristic of a model of a reservoir that may or may not vary with respect to position or with time.

A variable that is given a constant value for the purposes of certain calculations.

A marine flooding surface or its correlative surface.

A succession of genetically related parasequences that form a distinctive stacking pattern, and that are typically bounded by major marine flooding surfaces and their correlative surfaces.

A graphical representation of harmonic information in a data set.

A model of a reservoir or a field in which the petrophysical data were the only or the primary data used to construct the model.

A process or procedure used to interpret petrophysical (usually wireline log) data

Rock types that have been classified according to their petrophysical properties, especially properties that pertain to fluid behavior within the rock, such as porosity, capillary pressure, permeabilities, irreducible saturations or saturations.

A probability distribution in which the mean and the variance are identical.

The analysis of pressure changes over time, especially those associated with small variations in the volume of fluid

A means of assessing reservoir performance by measuring flow rates and pressures under a range of flowing conditions and then applying the data to a mathematical model.

The axis along which the data in n-dimensional space is primarily distributed.

Analysis of data that has been transformed from the original axes to principal axes, often abbreviated PCA.

A numerical estimate of the chances of an event occurring given a limited number of opportunities for the event to occur.

A map based on quantile values from the probabilities of the values of the data.

Special quantiles at 0%, 25%, 50%, 75% and 0%.

A method of following a trend between points by connecting the data points by segments of a circle such that the segments "line up" with each other smoothly.

A method of performing stochastic analysis on dynamic data

The fraction of hydrocarbons that can or has been produced from a well, reservoir or field; also, the fluid that has been produced.

A prediction of the amount of production that will occur from a well, reservoir or field.

The statistical fitting of trend lines to a data set.

A quantification of the degree of 'goodness' of fit of a regression line to a data set.

Fraction of pore volume occupied by oil at any location in a reservoir at any time during its life.

A model of a reservoir that incorporates all the characteristics of the reservoir that are pertinent to its ability to store hydrocarbons and also to produce them.

The act of building a reservoir model based on its characteristics with respect to fluid flow.

The flow of fluids from one part of a reservoir to another or from one reservoir to another.

The act of producing a model of a reservoir.

A computer run of a reservoir model over time to examine the flow of fluid within the reservoir and from the reservoir.

Fraction of pore volume occupied by oil at the end of oil displacement that used a specific fluid.

The physical characteristics of reservoir rocks that enable them to store fluids and to allow fluids to flow through them.

A set of characteristics that several rocks have in common.

A graph in which data points are plotted but not connected.

The geological barriers that isolate fluid compartments within reservoirs or that hydraulically isolate reservoirs from each other.

A procedure for estimating the reservoir characteristics between data points.

A form of fractal geometry based on a triangle.

A method for constructing a gridded reservoir model by iterative trial and error.

A technique for acquiring deviation information from a borehole on a slickline.

A property or characteristic that has the form of a sine wave.

The degree to which a distribution has lost the bilateral symmetry of a normal distribution

The periodicities in the behavior of the Earth and its climate with respect to the sun.

Abbreviation for residual oil saturation

A technique for utilizing fractal geometry to produce reservoir descriptions.

A mathematical procedure for connecting data points with a smooth line.

A form of homogeneity in a single characteristic.

A branch of mathematics that attempts to bring some understanding in the analysis of quantitative measurements.

An analysis related to a process involving a randomly determined sequence of observations, each of which is considered as a sample of one element from a probability distribution.

The production of a model of a reservoir or field by using stochastic methods to interpolate between data measurements (usually wells).

An analysis of the history, composition, relative ages and distribution of strata, and the interpretation of strata to elucidate Earth history.

The study of the history, composition, relative ages and distribution of strata, and the interpretation of strata to elucidate Earth history.

A fault whose primary movement is in the strike direction (usually horizontal).

An examination of a geological scenario to understand the geometry and spatial arrangement of rocks.

The seismic traces at a wellbore generated from wireline log data.

A mathematical entity with components that change in a particular way in a transformation from one coordinate system to another.

Pertaining to analysis based on equations or formulae derived from a theoretical basis in science.

A measure of deviation from a straight line.

A marine flooding surface separating the underlying lowstand systems tract from the overlying transgressive systems tract.

The degree to which a data set may be in error or stray from predicted values.

A quantum-mechanical principle formulated by German physicist Werner Karl Heisenberg

A method for rotating axes of a plot such that the eigenvectors remain orthogonal as they are rotated.

A two-point statistical function that describes the increasing differences or decreasing correlation, or continuity, between sample values as separation between them increases.

A law stating that lithologies that conformably overlie one another must have accumulated in adjacent depositional environments.

A continuous measurement of formation properties with electrically powered instruments to infer properties and make decisions about drilling and production operations.