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Hydrogen Sulphide Risk Analysis
the
Deadly

Deadly gas well blowout in China

Pipe

Pipe corrosion caused by hydrogen sulfide

Sealing

Sealing gold tubes for pyrolysis experiments using an arc welder

The Paradox of TSR

Thermochemical reduction of sulphate has been known for over 40 years
Geologic observations and thermodynamic calculations indicate that the reaction is favored under reservoir conditions
However, TSR has never been simulated in the laboratory under geologically realistic conditions
Either some kinetic inhibitors exist or high activation energies are required to reach a transition state

Methods

Extensive hydrous pyrolysis experimentation under simulated reservoir conditions
Quantification of generated gases using a custom GC containing 6 columns and 3 detectors (1 FID and 2 TCD) for simultaneous analysis of Ar, CO, CO2, H2, H2S, He, N2, and hydrocarbons
GC/MS, XPS, and XRD analysis of pyrolysis residues
Stable sulfur isotopic analysis of H2S, sulphate, and So
Molecular modeling of proposed reaction mechanisms
Kinetic modeling for extrapolation of experimental reaction rates to geologic heating rates

Vacuum

Vacuum line for collection of gas products from pyrolysis experiments

integrative

Research Objectives

Understand the physicochemical controls on TSR reactions
Develop a reaction network scheme for TSR
Extrapolate laboratory results to geologic conditions using kinetic models
Build a quantitative model of H2S generation potential to apply in basin models
Identify diagnostic criteria for recognizing TSR reactions and constraining model predictions

Catalysis

Catalysis of TSR Reactions by Inorganic Cations

Model

Model Prediction of H2S Generation for different Hydrocarbon Types Under Geological Conditions

Hydrocarbon

Hydrocarbon and Reservoir Chemistry Affect TSR Onset Temperature and Rate

TSR

TSR Affects Hydrocarbon Cracking

Industrial Partners

British Petroleum
ChevronTexaco
ENI
ExxonMobil
SaudiAramco
Shell Oil
Total