Tectono-Stratigraphic
Computer Experiments
SMITH-ROUCH, LINDA S., KRIS E. MEISLING, PETER E. HENNINGS, and JOHN M. ARMENTROUT
Using a 2-D forward stratigraphic
computer simulation, four experiments were
designed to test the relationship between normal
fault
movement and sediment
distribution across a
fault
plane. Each set of experiments focused on a specific
question. 1) Does rate of
fault
movement effect distribution of sediments across
a
fault
? 2). How is sediment thickness and distribution controlled by
fault
position? 3) What effect does variable accommodation space (sea level and
fault
movement) have on sediment distribution and stratal geometries across a
fault
?
4) What rate ratio (
fault
movement vs. sediment flux) renders
fault
movement
stratigraphically insignificant? Initial input parameters for
fault
rates,
sediment flux, and sea level were calculated from an offshore Nigeria data set.
Simulation iterations tested a range of values for input variables within the
context of each question. The authors admit to the limitations of 2-D forward
stratigraphic
models when attempting to reproduce 3-D
fault
movement. However,
results from experiments identified a quantified link between sediment
(lithofacies and thickness) and specific
fault
position and rate of movement.
Also, high resolution simulated delta-front stratal geometries displaced by
normal faults provided significant enhancement for seismic
interpretation
.
Another observation revealed that once sediment flux/
fault
movement ratio
reached a specific threshold very little evidence of
fault
movement was observed
in stratal geometries and lithofacies distribution above the
fault
.