Method for inverting reflection trace data from 3-D and 4-D seismic surveys and identifying subsurface fluid and pathways in and among hydrocarbon reservoirs based on impedance models
Patent
·
OSTI ID:871803
- New Milford, NJ
- New York, NY
A method is disclosed for inverting 3-D seismic reflection data obtained from seismic surveys to derive impedance models for a subsurface region, and for inversion of multiple 3-D seismic surveys (i.e., 4-D seismic surveys) of the same subsurface volume, separated in time to allow for dynamic fluid migration, such that small scale structure and regions of fluid and dynamic fluid flow within the subsurface volume being studied can be identified. The method allows for the mapping and quantification of available hydrocarbons within a reservoir and is thus useful for hydrocarbon prospecting and reservoir management. An iterative seismic inversion scheme constrained by actual well log data which uses a time/depth dependent seismic source function is employed to derive impedance models from 3-D and 4-D seismic datasets. The impedance values can be region grown to better isolate the low impedance hydrocarbon bearing regions. Impedance data derived from multiple 3-D seismic surveys of the same volume can be compared to identify regions of dynamic evolution and bypassed pay. Effective Oil Saturation or net oil thickness can also be derived from the impedance data and used for quantitative assessment of prospective drilling targets and reservoir management.
- Research Organization:
- Columbia University
- DOE Contract Number:
- FC22-93BC14961
- Assignee:
- Trustees of Columbia University in City of New York (New York, NY)
- Patent Number(s):
- US 5798982
- OSTI ID:
- 871803
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
/367/702/
3-d
4-d
allow
allows
assessment
available
based
bearing
bypassed
compared
constrained
data
data derived
data obtained
datasets
dependent
depth
derive
derived
disclosed
drilling
dynamic
dynamic fluid
effective
employed
evolution
flow
fluid
fluid flow
fluid migration
function
grown
hydrocarbon
hydrocarbons
identified
identify
identifying
identifying subsurface
impedance
inversion
inverting
isolate
iterative
log
management
mapping
method
method allow
method allows
migration
models
multiple
net
obtained
oil
pathways
pay
prospecting
prospective
quantification
quantitative
reflection
region
regions
reservoir
reservoirs
saturation
scale
scheme
seismic
seismic data
seismic source
seismic surveys
separated
source
structure
studied
subsurface
subsurface fluid
subsurface region
subsurface volume
surface region
surveys
targets
thickness
time
trace
useful
values
volume
3-d
4-d
allow
allows
assessment
available
based
bearing
bypassed
compared
constrained
data
data derived
data obtained
datasets
dependent
depth
derive
derived
disclosed
drilling
dynamic
dynamic fluid
effective
employed
evolution
flow
fluid
fluid flow
fluid migration
function
grown
hydrocarbon
hydrocarbons
identified
identify
identifying
identifying subsurface
impedance
inversion
inverting
isolate
iterative
log
management
mapping
method
method allow
method allows
migration
models
multiple
net
obtained
oil
pathways
pay
prospecting
prospective
quantification
quantitative
reflection
region
regions
reservoir
reservoirs
saturation
scale
scheme
seismic
seismic data
seismic source
seismic surveys
separated
source
structure
studied
subsurface
subsurface fluid
subsurface region
subsurface volume
surface region
surveys
targets
thickness
time
trace
useful
values
volume