Abstract - This paper describes the methodology and application
of a number of new structural-geological techniques for analysing faults
and fault systems. These are: firstly, fault-displacement analysis, which
is used to establish the commom fault-patterns for multiple horizons; secondly,
analysis of horizon separations on correlated faults to evaluate reservoir
connectivity; and thirdly, prediction of the fault-displacement population
below the limit of seismic resolution. There exists a substantial methodology
for achieving objectivity in the identification and mapping of geological
horizons on seismic sections. By contrast, however, the mapping of faults
and fault systems remains comparatively subjective with no firm methodolgy
for deriving a 'correct' fault-map. Recent research has demonstrated that
displacement varies systematically on fault surfaces and that by an analysis
of displacement patterns on putative fault-correlations objectivity and
methodology are introduced into fault correlation. We analyse displacement
patterns on faults using interactive-graphics software. Once a consistent
fault-pattern is established for all mapped horizons, reservoir connectivity
throughout the area can be evaluated from horizon-separation diagrams which
are produced automatically by our fault-analysis software for any selecyed
fault. Further recent research has shown that prediction of the displacement
population of faults and fractures below the limit of sesimic resolution
can be made from the seismically-resolved, fault-displacement population.
Additional calibration of the fault-displacement population can be obtained
from measurements made on cores from wells. The integration of these techniques
enables a detailed analysis and description of faults and fault systems
during seismic interpretation and reservoir evaluation.
In: The integration of geology, geophysics, petrophysics and petroleum
engineering in reservoir delineation, description and management. Proceedings
of the 1st Archie Conference, Houston, Texas, Association of American Petroleum
Geologists, 224-241, 1990.