A

Abiotic hypothesis

Accountability

Accuracy (of Monte Carlo)

Addition of reserves

Adequacy factor

Adjusted R-square

Adsorption

Age of basin fill

Aggregation of reserve estimates

Aims of prospect appraisal

Allan diagram

Alternative hypotheses

Amortization

Anaerobic generation of gas

Analysis of Variance

Analytical versus Monte Carlo

ANOVA

API (oil gravity)

Appreciation of reserves

A priori probability

ARMA

Assessment unit

Auctions of leases

Autocorrelation

Auto regressive moving average model

Average

Average POS

B

Bacterial degradation of oil

Bacterial gas

Base rate

Basin analysis

Basin multivariate analysis

Basin Volume

Bayes

Bayesian update of a normal distribution

Bayesian discriminant analysis

Bayes factor

Best estimate (P50)

Beta distribution

Beta update

BHT (Bottom Hole Temperature)

Bias

Bidding for leases

Binomial distribution

Bootstrap

Bottom of reservoir determination

Boyle-Gaylussac law for gas

Breakage models

Build-up phase

Build-up years

Bulk rock volume

Bonus

C

CAI, Conodont Alteration Index

Calibration

Calibrated prospect aprraisal systems

Camembert trap model

CAPEX (Capital Expenditure)

CAPEX per barrel plateau production

Cashflow

Cash surplus

CAT - Cumulative Area Test

CAT - Math of significance test

Central tendency

Chance of Fulfillment

Chance of Success

Chance tree

Hydrocarbon **C**harge

Classification

Clay smear potential

CDF, Cumulative distribution function

COCS - Chance of Commercial Success

COS - Chance of Success

Coefficients (regression)

Combining probabilities

Commercial resource

Commercial Risk

Commonality (geological)

Compaction effect on porosity

Compensated Time Ratio Method (CTRM)

Concession

Condensate gas ratio (CGR)

Condensate gas ratio (CGR)prior

Conditional distribution

Conditional probability

Conjugate distributions

Conodont Alteration Index

Contingent Resources

Contracts

Conventional oil resources

Correlation

Cosine trap model

Covariance (of prospects)

Creaming forecasting

Cross-validation

CTRM temperature correction

Cumulative Area Test (CAT)

Cumulative distribution

Current generation of HC

Cutoff estimation (economics)

Cutoff porosity

Cylinder trap model

D

Decision tree

Decline %

Decompaction

Degrees of freedom

Delta C^{13}

Delphi method

DeltaP for column estimation

Denver-Julesberg basin

Dependence of prospects

Depreciation

Depth-volume curve

Diamondoid

Differential pressure (Pd)

Discovery Process Modeling

Discovery rate decline

Discriminant Analysis

Dispersion

Distribution parameters

Double triangular distribution

Dry basins

**E**

Earning Power

Economics

Effective number of degrees of freedom
Enhanced recovery

Entrapment of hydrocarbons

Equation (regression)

Euclidian distance

Event chart

Exceedance probability plot

Exceedance curve

Exhumation

Expansion factor

Expectation

Expectation curve

Expected Exploration Costs

Expected Monetary Value (EMV)

Expert system

Explained variance

Exploration process modeling

**F**

Fairway maps

Fairway maps (Play-based prospect assessment)

Fieldsize decline

Fieldsize distribution

Fill-factor

Flushing

Forecasting

Forman's discovery process models

Formation Volume Factor (FVF)

Four-dimensional creaming"

Fractiles

Frequentistic probability

Fulfillment, chance of

Futurists

**G**

Gaeapas (prospect appraisal program)

Gaeatools programs

Gas chimney

Gas hydrates

Gas/Oil contact (GOC)-1

Gas/Oil contact (GOC)-2

Gas/Oil Ratio (GOR)

Gas price

Gaussian distribution (normal)

Generation (of HC)

Generation rate

Current **G**eneration

Geohistory graph (GEOHIST)

Geological risk (Geological POS)

Geometric mean

Geostatistics

Geothermal gradient

Goodness of fit test

GOR (Gas/Oil Ratio)

Granger-causality

Groningen gasfield

Groningen gas field, earthquakes

Gross reservoir

Groups of prospects evaluation

Growth of reserves

**H**

Hindsight analysis

Histogram

Hubbert curve

Hydrocarbon charge priors

Hydrocarbon column appraisal

Hydrocarbon contact appraisal

Hyperparameter

**I**

iid-violation

Inflation

Information measure H

Information and POS

Inverse normal distribution

Inversion index

Investment Efficiency (IE)

Isotope composition of Carbon

**J**

Jackknife and Bootstrap

Juxtaposition seal

**K**

Kendall's tau

Knipe diagram for fault seal

Kriging

Kolmogorov-Smirnov goodness of fit

Kozeny-Carman equation (Permeability-Prorosity)

**L**

Lag regression

Laherre

Lateral seal

Lateral migration

Latin Hypercube Sampling (LHS)

Learning set

Licence (production)

Likelihood ratio

Logistic curve

Logistic modeling

Log-linear decline curve extrapolation

Lognormal distribution

Longitudinal data (time series)

Lopatin

**M**

MAD, Merging and Addition of estimates

Marginal play probability

Marine vs. Non-Marine oils

Material Balance

Maturity estimation

Maturity index

Mean (average)

Mean Success Volume (MSV)

Median

Measures of central tendency

Measures of dispersion

Merging alternative hypotheses

Microcracks

Migration (secondary, of HC)

Minimum Spanning Tree

Mis-classification

Mode (most likely value)

Models (prospect appraisal)

Monoclinal trap model

Monte Carlo method

Most likely value

MST

MSV, Mean Success Volume

Multivariate analysis

**N**

Negative dependence

Net-to-gross ratio

Non-hydrocarbon gas

Non-linear Mapping (NLM)

Non-parametric correlation

Normal distribution

Normal distribution update

Nugget (in variogram)

Number of future discoveries estimation

**O**

Oil price

OPEC (Organization of Petroleum Producing Countries)

Operating expenses, OPEX

Original Organic Carbon content (TOCORIG)

Orthogonal variables

Outliers

**P**

Parallel folding style

Parameters of a distribution

Parametric correlation

Pareto distribution

Pay-out time

Percent of distribution left of mean

PBE (Play Based Exploration

Peak Oil

Peak production

Percentiles

Permeability

Petroleum System

Plateau years

Porosity

PDF, Probability Density Function

Play risk

Play risk calculation

Pollen Coloration Index
POS, probability of success

POS_{g}, probability of geological success

POS_{c}, probability of success after cutoff

POS-test

Posterior probability

Post-Mortem analysis

Pot odds

Porosity priors

Portfolio of prospects

Power Law

Predictive distribution

Predicted R-square

Prediction (regression)

Present Value (PV)

Precision

Previous exploration experience

Primary recovery efficiency

Prior distribution

Prior probability

Prior distributions for variables

Probability

Probability graph

Probabilistic production Forecasting

Process distribution

Production profile (PRODPROF)

Production bonus

Prospective Resources

PSA, Petroleum System Analysis

PSA (Production Sharing Agreement)

PSC (Production Sharing Contract)

Pseudo random numbers

PVT data (Pressure, Volume, Temperature,)

PVNCS

P90, P50, P10

P90, P50, P10 addition

1P, 2P, 3P and 1C, 2C, 3C classification

**Q**

Qualitative appraisal systems

Quantitative methods

Quality

**R**

Random number generator

Random sampling from a distribution

Rank correlation

Ranking of prospects

Real Value

Rectangular distribution

Recoverable resources

Recovery efficiency priors

Reducing subjectivity

Regression

Removed overburden

Remigration

Research papers

Reserves classification

Reservoir/seal pairs

Residuals

Residuals as a prior distribution

Restore eroded section

Resources

Ring fencing

Risk

Risk curve

Risked mean

Robust regression

Rock-Eval

Rolled-back Ultimate Recovery

Russian Federation Resource classification

R-square

**S**

S1, S2, S3 meaures

Sample mean

Scenarios

Seals

Seat seal

Secondary recovery efficiency

Semi-variogram

Sill (in variogram)

Similar folding style

SEC (Stock Exchange Commission)

Signature bonus

Sine Qua Non factor

Smear (of clay on faultplane)

Software

Solidity

Source rock type

Source rocks

Source rock recognition on wireline logs

Spatial data analysis

SPE (Society of Petroleum Engineers)

Spearman's rank correlation

Spherical trap model

Spurious correlation

Subjective appraisal systems

Subjective probability

Standard deviation

Stratigraphic traps

Structuration index

Swanson's rule

**T**

Taxation

t-distribution

Tectonic basin classification

Temperature correction (CTRM)

TFT or True Formation Temperature

Thermal cracking of oil

Thermochemical sulfate reduction

Thiessen polygons

Time series - autocorrelation

Time series - Lagged regression

T-max

Top seal calibration

Top seal capacity prior

TOC, definition

Total Organic Carbon (TOC) software

TOC estimate from wireline logs

Transformation ratio

Transformation of variables

Trap capacity growth

Trap capacity history

Trap description

Trap models (geometric)

Triangular distribution

Truncated shifted Pareto distribution

Truncated triangular distribution

TSA (Technical Service Agreement)

TTI - Time-Temperature-Integral

t-value

**U**

Ultimate recovery per well

Ultimate yield (of source rock)

Uniform distribution

Uniformity of reporting

Unit technical costs

Unitisation agreements

Uncertainty in prospect appraisal

Unconventional oil and gas resources

Unrecoverable Resources

Unrisked mean (MSV)

Updating a probability

Updating a normal distribution

USGS (United States Geological Survey) method

**V**

Variance

Variogram principle

Variogram program

Venn diagram

Verhulst

Vertical migration

Vertical anomaly clusters

Volcalc program

Voronoi polygons

**W**

Water-washing of oils

Well initial

Well Initial prior

World-wide priors

**X**

X - the independent variable(s)

**Y**

Y - the dependent variable

Yes/No vector

Yield curves (transformation ratio)

**Z**

Z-factor for gas

Zipf's Law (distribution)