140
A basin or subsurface study, which is the fi rst step in petroleum resource
evaluation, requires the following types of data (see Table 6.1):
Reservoir data—
•
pool area, net pay, porosity, water saturation,
oil or gas formation volume factor, in-place volume, recoverable
oil volume or marketable gas volume, temperature, pressure,
density, recovery factors, gas composition, discovery date, and
other parameters (refer to Lee et al., 1999, Section 3.1.2).
Well data—
•
surface and bottom well locations; spud and completion dates; well elevation; history of status; formation drill
and true depths; lithology; drill stem tests; core, gas, and fl uid
analyses; and mechanical logs.
Geochemical data—
•
types of source rocks, burial history, and
maturation history.
Geophysical data—
•
prospect maps and seismic sections.
Well data are essential when we construct structural contour,
isopach, lithofacies, porosity, and other types of maps. Geophysical
data assist us when we compile number-of-prospect distributions and
they provide information for risk analysis. The number of dry holes and
6
Estimation Update and Feedback Procedures
Far better an approximate answer to the right question, which is
often vague, than an exact answer to the wrong question, which can
always be made precise.
—John W. Tukey
A basin or subsurface study, which is the fi rst step in petroleum resource
evaluation, requires the following types of data (see Table 6.1):
Reservoir data—
•
pool area, net pay, porosity, water saturation,
oil or gas formation volume factor, in-place volume, recoverable
oil volume or marketable gas volume, temperature, pressure,
density, recovery factors, gas composition, discovery date, and
other parameters (refer to Lee et al., 1999, Section 3.1.2).
Well data—
•
surface and bottom well locations; spud and completion dates; well elevation; history of status; formation drill
and true depths; lithology; drill stem tests; core, gas, and fl uid
analyses; and mechanical logs.
Geochemical data—
•
types of source rocks, burial history, and
maturation history.
Geophysical data—
•
prospect maps and seismic sections.
Well data are essential when we construct structural contour,
isopach, lithofacies, porosity, and other types of maps. Geophysical
data assist us when we compile number-of-prospect distributions and
they provide information for risk analysis. The number of dry holes and
6
Estimation Update and Feedback Procedures
Far better an approximate answer to the right question, which is
often vague, than an exact answer to the wrong question, which can
always be made precise.
—John W. Tukey