A chemical and thermodynamic model of oil generation in hydrocarbon source rocks

Helgeson, Harold C.; Richard, Laurent; McKenzie, William F.; Norton, D.; Schmitt, Alexandra

doi:10.1016/j.gca.2008.03.004

Cited by 115 publications

(69 citation statements)

References 135 publications

(247 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Therefore, and for the sake of simplicity, kerogen maturation is simulated by adding its products CH 4 , CO 2 , H 2 and acetic acid into the batch modelling reactor. In this study, their initial relative production ratios are set to 1.9 (for CO 2 ), 0.9 (for CH 4 ), 5.0 (for H 2 ) and 0.1 (for acetic acid : Seewald 2003;Helgeson et al 2009;van Berk et al 2009); molecular hydrogen and carbon dioxide will subsequently react to form additional methane. The initial ratio of CO 2 to acetic acid follows the findings of Barth & Bjørlykke (1993).…”

Section: Generation Of Aqueous Gas-bearing Fluids With Acidic and Cormentioning

confidence: 99%

Creation of pre-oil-charging porosity by migration of source-rock-derived corrosive fluids through carbonate reservoirs: one-dimensional reactive mass transport modelling

Berk

Schulz

2014

View full text Add to dashboard Cite

Locally increased porosity of carbonate reservoir rocks may result from acidic fluids that migrated as a pre-oil phase through the reservoir. Here, hydrogeochemical modelling, which is based on the principles of chemical equilibrium thermodynamics, is performed to test such a hypothetical concept. Despite the generic nature of the model, the modelling results give basic and quantitative insights into the mechanisms of calcite dissolution in carbonate reservoirs induced by migrating acidic and corrosive aqueous fluids.The hydrogeochemical batch modelling considers pre-oil-phase aqueous fluids that form by kerogen maturation in siliciclastic source rocks underlying the carbonate reservoir rocks. Although saturated with respect to calcite, migration of such fluids through the carbonate reservoir triggers continuous calcite dissolution along their migration path following a decreasing pressure and temperature regime. One-dimensional reactive transport modelling reveals that thermodynamically controlled chemical re-equilibration among pre-oil-phase fluids, calcite and CO 2(g) is the driving force for continuous calcite dissolution along this migration path. This reflects the increasing solubility of calcite in the system 'pre-oil-phase fluids/calcite/CO 2(g) ' with decreasing pressure and temperature. In consequence, such fluids can preserve their calcite-corrosive character, if they are exposed to continuously decreasing pressure and temperature along their migration path through the reservoir. Supplementary material:The modelling input files to ensure retraceability of our modelling approach and its results are available at

show abstract

Section: Generation Of Aqueous Gas-bearing Fluids With Acidic and Cormentioning

confidence: 99%

Creation of pre-oil-charging porosity by migration of source-rock-derived corrosive fluids through carbonate reservoirs: one-dimensional reactive mass transport modelling

Berk

Schulz

2014

View full text Add to dashboard Cite

show abstract

“…This assumption, however, is not valid if the equilibrium constants, and therefore, the relative abundances of isomers, change significantly with continued increase in temperature. Not only does increased temperature result in increased rates of the maturation reactions (Tissot and Welte, 1984), but heating may also change the directions of the reactions as a result of changes in equilibrium constants Helgeson et al, 1998Helgeson et al, , 2009 Studies whose results fit the conventional expectation of increasing maturity parameters with increasing time and temperature include that of Love et al (1996), who found that the coal samples with the highest R o (1.32%) had the highest MPR (3.34 in dichloromethane extract; 2.71 in pyrolysate). Davies (1997) documented increasing values of MPR up to R o = 1.1%.…”

Section: Thermal Maturation Of Organic Matter: Transitions From Kinetmentioning

confidence: 99%

“…It has already been established that metastable equilibrium states are attainable in hydrothermal systems containing organic molecules (Helgeson et al, 1993;Shock, 2000;Seewald, 2001;Helgeson et al, 2009). …”

Section: Introductionmentioning

confidence: 99%

Estimation and application of the thermodynamic properties of aqueous phenanthrene and isomers of methylphenanthrene at high temperature

Dick

Evans

Holman

et al. 2013

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

Estimates of standard molal Gibbs energy (∆G • f ) and enthalpy (∆H indicative of more reducing conditions at a given temperature than those inferred from data reported for two sets of samples exposed to contact or regional metamorphism. These results are limiting-case scenarios for the modeled systems that do not account for effects of non-ideal mixing or kinetics, or external sources or transport of the organic matter. Nevertheless, quantifying the temperature dependence of equilibrium constants of organic reactions enables the utilization of organic maturity parameters as relative geothermometers at temperatures higher than the nominal limits of the oil window.

show abstract

“…The first of these mineral buffers is representative of the redox conditions established in hydrocarbon reservoirs (Helgeson et al, 1993) and source rocks (Helgeson et al, 2009). It can be deduced from the log activitylogf O 2ðgÞ diagrams of Fig.…”

Section: Organic Iodine In Petroleum Systemsmentioning

confidence: 99%

Thermodynamic properties of organic iodine compounds

Richard¹,

Gaona

2011

Geochimica et Cosmochimica Acta

Self Cite

View full text Add to dashboard Cite

A chemical and thermodynamic model of oil generation in hydrocarbon source rocks

Cited by 115 publications

References 135 publications

Creation of pre-oil-charging porosity by migration of source-rock-derived corrosive fluids through carbonate reservoirs: one-dimensional reactive mass transport modelling

Creation of pre-oil-charging porosity by migration of source-rock-derived corrosive fluids through carbonate reservoirs: one-dimensional reactive mass transport modelling

Estimation and application of the thermodynamic properties of aqueous phenanthrene and isomers of methylphenanthrene at high temperature

Thermodynamic properties of organic iodine compounds

Contact Info

Product

Resources

About