Change in the Maturation of Organic Matter and Conversion of the Hydrocarbon Potential in the Burial History of Source Rocks in the Mannar Basin, Offshore Sri Lanka

Autor: Yu. I. Galushkin, E. P. Dubinin
Rok vydání: 2021
Předmět:
Zdroj: Geochemistry International. 59:938-946
ISSN: 1556-1968
0016-7029
Popis: Numerical simulations of the burial and thermal history of the Mannar Basin using the GALO system for basin modeling make it possible to evaluate the change in the temperature and organic matter maturation in the source rocks of the basin and trace the variations in the rock temperature and maturity with distance from the axis of the ancient rift. Our analysis shows that organic matter of Jurassic rocks recovered by Wells Pearl 1 and Dorado North, located in a flank of the rift, occurs within the oil window (0.50 ≤ Ro ≤ 1.30%), whereas the maturity of these rocks in Wells Pseudo Mannar Deep and Barracuda, which are close to the rift axis, considerably exceeds maturity within this window. The probable Jurassic source rocks generate mainly heavy and light oil and a little gas in areas far from the rift axis, but these rocks generate mainly gas in the areas near the axis. The modeling shows that the thermal activation of the lithosphere of this basin in the Upper Cretaceous had a noticeable effect on the temperature and maturity of the rocks in areas close to the ancient rift axis (Pseudo Mannar Deep and Barracuda wells), but its effect is markedly reduced in areas remote from the rift axis (Wells Pearl 1 and Dorado North).
Databáze: OpenAIRE
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