Modeling petroleum generation, retention, and expulsion from the Vaca Muerta Formation, Neuquén Basin, Argentina: Part I. integrating compositional kinetics and basin modeling
| Autor: | Alan K. Burnham, Johannes Wendebourg, Francois Gelin, Noelle Schoellkopf, Mei Mei |
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| Rok vydání: | 2021 |
| Předmět: |
010504 meteorology & atmospheric sciences
Stratigraphy Geology 010502 geochemistry & geophysics Oceanography 01 natural sciences Cracking chemistry.chemical_compound Permeability (earth sciences) Pore water pressure Geophysics chemistry Source rock Basin modelling Kerogen Petroleum Economic Geology Petrology Porosity 0105 earth and related environmental sciences |
| Zdroj: | Marine and Petroleum Geology. 123:104743 |
| ISSN: | 0264-8172 |
| Popis: | Improved understanding and prediction of petroleum expulsion, retention, and producibility from source rocks (SR) are achieved by integrating 3D basin modeling with customized compositional kinetics and retention model for the lower Vaca Muerta Formation (LVM), Neuquen Basin, Argentina. Modeling results indicate basin-wide expulsion from LVM started in the late Cretaceous when petroleum generation exceeded the SR retention capacity at thermal maturity of 0.9–1.0% Ro, associated with increasing pore pressure (Pp), increasing then maintained porosity (o), permeability (k), and free petroleum retained in the SR (free petroleum). Expulsion ceased around the middle Eocene when kerogen, polar components, and medium aromatics were totally cracked at about 1.1–1.3% Ro. In the late Eocene, a different type of expulsion occurred in deeply buried areas at > 1.3% Ro due to continued cracking of the remaining larger hydrocarbons to form smaller hydrocarbons. The petroleum cracking created volume expansion, which in turn induced rock fracturing, which then reduced Pp, o, k, and free petroleum. Then, continuous thermal cracking increased Pp and maintained o, k, and free petroleum. In the mid-Miocene, tectonic uplift stopped the thermal stress and secondary cracking, and decreased pressure and temperature. Modeled petroleum compositions and properties such as gas wetness, oil °API gravity, gas/oil ratio are calibrated to Vaca Muerta (VM) core extracts, produced oils, and mud gases at wells with maturities ranging from oil window to dry gas. Our study indicates larger and polar components are preferentially sorbed within the source rock and cracked through thermal maturation by 1.3%Ro. Genetic saturates/aromatics ratio (S/A) equals about one at |
| Databáze: | OpenAIRE |
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