Computing Risk for Oil Prospects: Principles and Programs -  J.C. Davis,  J.W. Harbaugh,  J. Wendebourg

Computing Risk for Oil Prospects: Principles and Programs (eBook)

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1995 | 1. Auflage
451 Seiten
Elsevier Science (Verlag)
978-0-08-052950-9 (ISBN)
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The petroleum industry is enduring difficult financial times because of the continuing depressed price of crude oil on the world market. This has caused major corporate restructuring and reductions in staff throughout the industry. Because oil exploration must now be done with fewer people under more difficult economic constraints, it is essential that the most effective and efficient procedures be used. Computing Risk for Oil Prospects describes how prospect risk assessment &mdash, predicting the distribution of financial gains or losses that may result from the drilling of an exploration well &mdash, can be done using objective procedures implemented on personal computers. The procedures include analyses of historical data, interpretation of geological and geophysical data, and financial calculations to yield a spectrum of the possible consequences of decisions. All aspects of petroleum risk assessment are covered, from evaluating regional resources, through delineating an individual prospect, to calculation of the financial consequences of alternative decisions and their possible results. The bottom lines are given both in terms of the probable volumes of oil that may be discovered and the expected monetary returns. Statistical procedures are linked with computer mapping and interpretation algorithms, which feed their results directly into routines for financial analysis. The programs in the included library of computer programs are tailored to fit seamlessly together, and are designed for ease and simplicity of operation. The two diskettes supplied are IBM compatible. Full information on loading is given in Appendix A - Software Installation. Risk I diskette contains data files and executables and Risk 2 diskette contains only executables.

The authors contend that the explorationist who develops a prospect should be involved in every facet of its analysis, including risk and financial assessments. This book provides the tools necessary for these tasks.


The petroleum industry is enduring difficult financial times because of the continuing depressed price of crude oil on the world market. This has caused major corporate restructuring and reductions in staff throughout the industry. Because oil exploration must now be done with fewer people under more difficult economic constraints, it is essential that the most effective and efficient procedures be used. Computing Risk for Oil Prospects describes how prospect risk assessment - predicting the distribution of financial gains or losses that may result from the drilling of an exploration well - can be done using objective procedures implemented on personal computers. The procedures include analyses of historical data, interpretation of geological and geophysical data, and financial calculations to yield a spectrum of the possible consequences of decisions. All aspects of petroleum risk assessment are covered, from evaluating regional resources, through delineating an individual prospect, to calculation of the financial consequences of alternative decisions and their possible results. The bottom lines are given both in terms of the probable volumes of oil that may be discovered and the expected monetary returns. Statistical procedures are linked with computer mapping and interpretation algorithms, which feed their results directly into routines for financial analysis. The programs in the included library of computer programs are tailored to fit seamlessly together, and are designed for ease and simplicity of operation. The two diskettes supplied are IBM compatible. Full information on loading is given in Appendix A - Software Installation. Risk I diskette contains data files and executables and Risk 2 diskette contains only executables. The authors contend that the explorationist who develops a prospect should be involved in every facet of its analysis, including risk and financial assessments. This book provides the tools necessary for these tasks.

Front Cover 1
Computing Risk for Oil Prospects:Principles and Programs 4
Copyright Page 5
CONTENTS 8
Foreword 11
Preface: Getting Things Rolling 12
Acknowledgments 14
Chapter 1. The Challenge of Risk Assessment 16
THE NATURE OF EXPLORATION 17
DEFINING PROBABILITIES 19
GEOLOGICAL UNCERTAINTY AND OIL OCCURRENCE 27
REGIONAL HYDROCARBON ENDOWMENT 30
PRINCIPAL PREMISES OF THIS BOOK 37
Chapter 2. Field Size Distributions 44
ESTIMATING “Q” 44
OIL FIELD POPULATIONS 48
STATISTICS OF FREQUENCY DISTRIBUTIONS 52
CUMULATIVE PROBABILITY PLOTS 57
CAUTION: FUTURE DISCOVERIES 64
Chapter 3. Success, Sequence, and Gambler’s Ruin 70
SUCCESS RATIOS AND DRY HOLE PROBABILITIES 71
LONG -TERM LUCK AND BINOMIAL DISTRIBUTION 72
Chapter 4. Estimating Discovery Size from Prospect Size 86
STATISTICAL CORRELATIONS BETWEEN PROPERTIES 86
ESTIMATING VOLUMES FROM SEISMIC MAPS 95
Chapter 5. Outcome Probabilities and Success Ratios 104
GEOLOGY AND DRILLING RESULTS 104
BAYESIAN REVISION OF REGIONAL SUCCESS RATIOS 114
BAYESIAN REVISION OF DISTRIBUTIONS 122
Chapter 6. Modeling Prospects 126
APPEAL OF THE SIMULATION APPROACH 126
STEPS IN MONTE CARLO SIMULATION 128
DISTRIBUTIONS AND PARAMETERS 143
ARE GEOLOGIC PROPERTIES INDEPENDENT? 148
Chapter 7. Mapping Properties and Uncertainties 152
COMPUTER CONTOURING 152
HOW CONTOUR MAPS ARE MADE 154
GEOSTATISTICS IN RISK ASSESSMENT 164
Chapter 8. Discriminating Discoveries and Dry Holes 188
COMBINING GEOLOGICAL VARIABLES 189
ASSESSING A NEW AREA 196
UPDATING ASSESSMENTS 204
EXPLORING MAGYARSTAN TARGET AREA 206
THE IMMATURESTAGE 207
THE INTERMEDIATE STAGE 217
THE MATURE STAGE 224
THE FINAL STAGE 226
Chapter 9. Forecasting Cash Flow for a Prospect 230
FINANCIAL OVERVIEW 230
DISCOUNTED NET CASH FLOW ANALYSIS 233
USING CASHFLOW 241
OUTPUT FROM CASHFLOW 267
EXAMPLE APPLICATIONS OF CASHFLOW 270
Chapter 10. The Worth of Money 280
A DRY HOLE VERSUS A DISCOVERY 280
Chapter 11. RATS, Decision Tables, and Trees 294
RATs LINK OUTCOMES WITH RISK 294
HOW RATs TREAT INFORMATION 300
EXAMPLE RISK ANALYSIS TABLES 311
DECISION AIDS FOR ACTIONS 320
CONSTRUCTING DECISION TABLES 327
DECISION TREES 327
OVERVIEW AND A LOOK TO THE FUTURE 334
Chapter 12. Bringing it Together 338
RISKING THE ROSKOFF PROSPECT 338
THE PRIZE OFFERED 339
TROYSKA AND ROSKOFF AREAS COMPARED 342
ESTIMATING ROSKOFF’S DRY HOLE PROBABILITY 343
PROBABILITIES ATTACHED TO FIELD VOLUMES 348
ROSKOFF PROSPECT FINANCIAL ANALYSIS 355
SOME FINAL POINTS 362
Bibliography 368
Appendix A – SOFTWARE INSTALLATION of RISK: Software to perform probabilistic assessments and financial calculations in Computing Risk for Oil Prospects 398
Appendix B – RISKSTAT MANUAL: Linked computer programs that perform statistical analyses in RISK 402
Appendix C – RISKMAP MANUAL: Linked computer programs that perform the mapping function in RISK 420
Appendix D – RISKTAB MANUAL: Linked computer programs that perform financial calculations in RISK 442
Index 458

Erscheint lt. Verlag 22.11.1995
Sprache englisch
Themenwelt Sachbuch/Ratgeber
Mathematik / Informatik Informatik Theorie / Studium
Informatik Weitere Themen Hardware
Naturwissenschaften Geowissenschaften Geologie
Technik Bergbau
ISBN-10 0-08-052950-X / 008052950X
ISBN-13 978-0-08-052950-9 / 9780080529509
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