to Petroleum Systems
many times have we heard that...."the expected
pay sands were encountered but they are water-bearing
and the well was plugged and abandoned."
What happened? Why was there no oil or gas?
In many cases, the prospect was not located
within the boundaries of a petroleum system.
Economic failures such as this can be minimized
by conducting a petroleum system study prior
A petroleum system study looks at the genetic
relationship between a source rock and all related
oil and gas and seeks to map the distribution
of hydrocarbons in the subsurface prior to drilling.
It describes all of the elements and processes
needed to make and preserve an oil or gas accumulation.
Such a study examines a basin beginning at the
time of oil and gas generation, migration, and
entrapment up to the present. It draws geology,
geochemistry, geophysics, modeling, and engineering
data and concepts together in a way that can
significantly reduce exploration risk in well-developed
basins, as well as in frontier areas. The basic
elements of a petroleum
system report are a burial history chart,
a map and cross-section drawn at the time of
initial oil or gas migration, an events chart,
geochemical data to correlate source rocks to
oils and gases, and the history of a prospect
from the time oil and gas were first trapped
until the present. Prospects selected with petroleum
system analysis will much more frequently result
in wells where "the expected pay sands
were encountered, they contained oil and gas,
and the well was completed as a producer."
Porady, jak leczyć
DGSI actively supports the petroleum system
approach to oil and gas exploration. We can
help our clients with petroleum system studies
and provide the geochemical data that is an
essential part of any petroleum system report.
No company is better qualified to do this because
we wrote the book* on the subject.
*AAPG Memoir 60 "The
Petroleum System--From Source to Trap"
by Leslie B. Magoon (USGS) and Wallace G. Dow