Well logging analysis methods for use in complex lithology reservoirs
Patent
·
OSTI ID:7247749
This patent describes a machine implemented iterative method of well log analysis to determine the volumes of anhydrite (or gypsum) in three mineral combination lithology utilizing well log measurements of gamma-gamma density, neutron and acoustic properties of earth formations in the vicinity of a well borehole. The method comprises: (a) obtaining a gamma-gamma density versus neutron porosity crossplot from the respective logs at a corresponding depth in the well borehole; (b) determining rho/sub map/ (the average density of rock matrix) and ..delta..t/sub map/ (the average matrix acoustic travel time) by solving the crossplot for two mineral lithology; using the rho/sub map/ and ..delta..t/sub map/, then determining the volume of anhydrite (or gypsum) present.
- Assignee:
- Halliburton Co., Duncan, OK
- Patent Number(s):
- US 4617825
- OSTI ID:
- 7247749
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
440400 -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
ALKALINE EARTH METAL COMPOUNDS
ANHYDRITE
BULK DENSITY
CALCIUM COMPOUNDS
CALCIUM SULFATES
CARBONATE ROCKS
DATA ANALYSIS
DENSITY
ELECTRON DENSITY
EQUATIONS
FLUIDS
GAMMA-GAMMA LOGGING
GEOLOGIC DEPOSITS
GRAPHS
GYPSUM
ITERATIVE METHODS
LIMESTONE
LITHOLOGY
MINERAL RESOURCES
MINERALS
NATURAL GAS DEPOSITS
NEUTRON LOGGING
OXYGEN COMPOUNDS
PETROLEUM DEPOSITS
PHASE VELOCITY
PHYSICAL PROPERTIES
POROSITY
RADIOACTIVITY LOGGING
RESERVOIR FLUIDS
RESOURCES
ROCKS
SEDIMENTARY ROCKS
SONIC LOGGING
SOUND WAVES
SULFATE MINERALS
SULFATES
SULFUR COMPOUNDS
TIME DEPENDENCE
VELOCITY
WELL LOGGING
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
440400 -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
ALKALINE EARTH METAL COMPOUNDS
ANHYDRITE
BULK DENSITY
CALCIUM COMPOUNDS
CALCIUM SULFATES
CARBONATE ROCKS
DATA ANALYSIS
DENSITY
ELECTRON DENSITY
EQUATIONS
FLUIDS
GAMMA-GAMMA LOGGING
GEOLOGIC DEPOSITS
GRAPHS
GYPSUM
ITERATIVE METHODS
LIMESTONE
LITHOLOGY
MINERAL RESOURCES
MINERALS
NATURAL GAS DEPOSITS
NEUTRON LOGGING
OXYGEN COMPOUNDS
PETROLEUM DEPOSITS
PHASE VELOCITY
PHYSICAL PROPERTIES
POROSITY
RADIOACTIVITY LOGGING
RESERVOIR FLUIDS
RESOURCES
ROCKS
SEDIMENTARY ROCKS
SONIC LOGGING
SOUND WAVES
SULFATE MINERALS
SULFATES
SULFUR COMPOUNDS
TIME DEPENDENCE
VELOCITY
WELL LOGGING