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Interpretation of Subsurface Hydrocarbon Shows
Tim T. Schowalter 2, Paul D. Hess 3

Table of Contents

 

ABSTRACT
INTRODUCTION
CLASSIFICATION OF HYDROCARBON PHYSICAL MODES OF OCCURENCE
Show types
Continous Phase Shows (Type 1)
Residual Shows (Type II)
Molecular-Scale Dissolved Hydrocarbon Phase (Type III)
Hydrocarbons Incorporated in Kerogen (Type IV)
Implication of Modes of Occurence
Identification of Type One Shows
Hydrocarbon Saturation
Fluid Recovery
Extrapolation Case History -Buffalo Previous HitFieldNext Hit
EXPLORATION OF TYPE 1 SHOWS IN COMPLEX STRATIGRAPHIC TRAPS
Simple Stratigraphic Trap Model
Complex Stratigraphic Trap Model
Transition Zone Characteristics
Waste Zone Characteristics
Exploration Implications of Transition and Waste Zones
SHOW INTERPRETATION-EXTRAPOLATION CASE HISTORIES
Waste zone
Pay Dirt Previous HitFieldNext Hit- Gas Waste Zone
Transition Zone Previous HitExampleNext Hit
Poker Chip Previous HitFieldNext Hit
TEST CASE
Case histories related to hydrocarbon shows-1982
Buffalo Previous HitfieldNext Hit, Harding County, South Dakota Structural map (Fig. 5)
Core and log Previous HitdataNext Hit (Fig. 6; Fig. 21)
Log and test Previous HitdataNext Hit (Fig. 19)
Cross section, western part of Previous HitfieldNext Hit (Fig. 20)
Capillary pressure curves (Fig. 7; Fig. 22)
Pay Dirt Previous HitfieldNext Hit Structural map (Fig. 11)
Cross section (Fig. 12)
Core and log Previous HitdataNext Hit (Fig. 13; Fig. 14)
Capillary pressure curves (Fig. 15; Fig. 16)
Poker Chip Previous HitfieldNext Hit Core and log Previous HitdataNext Hit (Fig. 17)
Capillary pressure curves (Fig. 18)
SUMMARY AND CONCLUSIONS
REFERENCES
 
Acknowledgments:
2 Mosbacher & Pruet Oil Producers, Denver, Colorado.
3
B.W.A.B., Inc., Denver, Colorado.

We thank Shell Oil Co., Houston, Texas; Kirkwood Oil and Gas, Casper, Wyoming; and Koch Exploration Co., Wichita, Kansas, for the release of materials presented in this report. Personal acknowledgments to Don Hartman, John McCallum, and Steve Kirkwood for their contributions in assembling the geologic framework for the Previous HitfieldTop studies presented. Some illustrations were adapted from Core Laboratories instructional manuals.

© 1994 American Association of Petroleum Geologists