Comparison of methods for measuring kerogen pyrolysis rates and fitting kinetic parameters. [Rock Eval]
We determine rates of product evolution during pyrolysis of several petroleum source rocks and isolated kerogens by nonisothermal techniques, including Rock Eval pyrolysis-MS/MS. The resulting data are analyzed by nonlinear regression and simpler correlation techniques in terms of discrete and Gaussian distributed activation energy models. We find that temperatures measured by standard Rock Eval analysis are too low by about 40/sup 0/C, resulting in kinetic expressions that are much too fast. Proper temperature calibration eliminates this problem. We explore the sensitivity of the kinetic parameters and extrapolation to geologic heating rates to uncertainty in the temperature calibration. We find that the discrete distribution model provides a superior fit to the laboratory data and probably a more reliable extrapolation to geological heating rates. We also assess how differences among kinetics for individual species relate to the activation energy distributions required for total hydrocarbon evolution. Kinetics from Rock Eval pyrolysis predict hydrocarbon generation rates intermediate between kerogen decomposition and oil expulsion during hydrous pyrolysis, but slight differences in activation energies result in similar predictions for a geological heating rate. Predictions for type I kerogens fall at the high end, but within the range, of oil generation temperatures predicted for type II kerogens. 18 refs., 7 figs., 5 tabs.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA); Lab Instruments, Inc., Kenwood, CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6631224
- Report Number(s):
- UCRL-95660; CONF-870410-18; ON: DE87008425
- Resource Relation:
- Conference: 193. national meeting of the American Chemical Society, Denver, CO, USA, 5 Apr 1987; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
02 PETROLEUM
KEROGEN
PYROLYSIS
OIL SHALES
SOURCE ROCKS
ACTIVATION ENERGY
ERRORS
EXPERIMENTAL DATA
GREEN RIVER FORMATION
HEATING RATE
MASS SPECTROSCOPY
MEASURING METHODS
PROGRAMMING
REACTION KINETICS
TEMPERATURE MEASUREMENT
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
DATA
DECOMPOSITION
ENERGY
ENERGY SOURCES
FOSSIL FUELS
FUELS
GEOLOGIC FORMATIONS
INFORMATION
KINETICS
MATERIALS
NUMERICAL DATA
ORGANIC MATTER
SPECTROSCOPY
THERMOCHEMICAL PROCESSES
040401* - Oil Shales & Tar Sands- In Situ Methods
True & Modified
020300 - Petroleum- Drilling & Production