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Change in the degree of catagenesis and hydrocarbon generation in the sedimentary rocks of the South Sumatra Basin, Indonesiaстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 17 ноября 2014 г.
- Авторы: Galushkin Yu I., Mardianza A.
- Журнал: Geochemistry International
- Том: 52
- Номер: 8
- Год издания: 2014
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 643
- Последняя страница: 653
- DOI: 10.1134/S0016702914080035
- Аннотация: Temperature and catagenetic history of the South Sumatra Basin in Indonesia is considered by the example of the sedimentary sequence of the Limau graben during its subsidence from the Oligocene to the present time. GALO system for basin modeling was applied for numerical reconstruction of six sedimentary successions in the area of holes Pandan81, Petanang1, Tepus2, Tepus1, Gambir1, and Lembak8 located along the profile cutting across the Limau graben. Modeling suggests significant cooling of the basemen for the last 15–20 Ma from the high initial heat flow of 105 mW/m2, which is typical of axial zones of continental rifting, and significant heating of the basin lithosphere during the last 2–5 Ma. Examination of variations in tectonic subsidence of the basin confirms the possible extension of the lithosphere in the Oligocene– Miocene with an amplitude β increasing from 1.12 on the flanks of the Limau graben (Hole Lembak8) to 1.32 in the central part of the graben (Tepus1 and 2), Tectonic analysis indicates also the notable thermal activation of the basin in the Pliocene, Pleistocene, and Holocene. This activation is consistent with the high temperature gradient typical of the presentday sedimentary cover of the basin. Numerical modeling of the evolution of the organic matter maturity and hydrocarbon generation by main source formations of the basin confirms good prospects of the inferred source formations (Lemat, Talang Akar, and Gumai) of the South Sumatra basin for the generation of liquid hydrocarbons (HC) in the Limau Graben. It is also demonstrated that the source rocks of the Lemat Formation are oregenerating rocks in the main part of the Limau graben and are gasgenerating rocks only in the deepest portions of the graben. The rocks at the base and roof of the Talang Akar Formation could be considered as highly oilgenerating rocks, probably except for the upper horizons of the formation in the shallowest portions of the graben (Hole Lembak8). Oil generation reached peak in the last 5–10 Ma. Modeling showed that intense oil generation by the Gumai Formation may be sig nificant in the most part of the Limau graben and negligible only in the distant flanks of the graben (Hole Lembak8).
- Добавил в систему: Галушкин Юрий Иванович