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The AAPG/Datapages Combined Publications Database

CSPG Bulletin

Abstract


Bulletin of Canadian Petroleum Geology
Vol. 25 (1977), No. 5. (September), Pages 995-1036

Mapping Stratigraphic Traps with Previous HitElectricalNext Hit Transients

Jamil Azad

TABLE OF CONTENTS

  • ABSTRACT, Page 996
  • INTRODUCTION, Page 996
  • Previous HitELECTRICALNext Hit TRANSIENTS, Page 997
    • DESCRIPTION, Page 997
    • NOISE, Page 998
      • Electrode Potential, Page 998
      • Telluric Noise, Page 998
      • Man-Made Noise, Page 999
      • Naturally Occurring High-Frequency Noise, Page 999
      • Induced Polarization, Page 999
    • VELOCITY OF THE SIGNAL, Page 999
    • REFLECTION, Page 1000
      • Physics, Page 1000
      • Edge-of-Field Studies, Page 1001
      • Size of Reflection, Page 1002
      • Nature of the Hydrocarbon-Generated Reflection, Page 1004
    • FUNDAMENTAL QUESTIONS ON Previous HitELECTRICALNext Hit TRANSIENTS, Page 1005
      • Effect of Casings, Page 1005
      • Effect of Surface Spills, Page 1005
      • Effect of Upward Migration of Hydrocarbons, Page 1005
      • Reconciliation with Previous HitElectricalNext Hit Logs, Page 1005
    • TESTING Previous HitELECTRICALNext Hit TRANSIENTS, Page 1008
      • Repeatability, Page 1008
      • Reproducibility, Page 1008
      • Significance, Page 1008

CASE HISTORIES

    • CHANNEL SANDS, Page 1008
      • Case History No. 1, Page 1011
      • Case History No. 2, Page 1013
    • BAR SANDS, Page 1013
      • Case History No. 3, Page 1013
    • BEACH SANDS, Page 1013
      • Case History No. 4, Page 1013
    • REEFS, Page 1013
      • Case History No. 5, Page 1019
    • POROSITY IN CARBONATES, Page 1019
      • Case History No. 6, Page 1019
    • EROSIONAL FEATURES, Page 1019
      • Case History No. 7, Page 1019
End_Page 995------------------------
    • CONDEMNATIONS, Page 1024
      • Case History No. 8, Page 1024
      • Case History No. 9, Page 1024
      • Case History No. 10, Page 1027
  • LIMITS OF APPLICATION, Page 1027
    • RESERVOIR THICKNESS, Page 1027
      • Case History No. 11, Page 1027
      • Case History No. 12, Page 1027
      • Case History No. 13, Page 1030
    • RESERVOIR DEPTH, Page 1030
      • Case History No. 14, Page 1030
    • RESERVOIR IDENTIFICATION FROM SHAPE, Page 1030
    • RESERVOIR PERMEABILITY, Page 1030
      • Case History No. 15, Page 1032
    • RESERVOIR FLUIDS COMPOSITION AND EVOLUTION, Page 1033
      • Case History No. 16, Page 1033
  • COMBINATION APPROACH, Page 1034
    • COMBINATION WITH Previous HitELECTRICALNext Hit LOGS, Page 1034
    • COMBINATION WITH GRAVITY, Page 1034
    • COMBINATION WITH SEISMIC, Page 1034
  • SUMMARY AND CONCLUSIONS, Page 1034

ABSTRACT

Previous HitElectricalTop transients are used to obtain a reflection from hydrocarbon accumulations occurring in the subsurface. This information is used to plot the areal extent of pools in the subsurface and may provide a semiquantitative estimate of their magnitude. The method works irrespective of structure, making it ideally suited to deal with stratigraphic traps. To optimize the chances of commercial success, it should be integrated with all other sources of valid information; for instance, it complements seismic information by providing a direct hydrocarbon indicator.

The use of the method in mapping stratigraphic traps is documented by a number of case histories.


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