Association of oil source algae in some Tertiary basins, northern Thailand

Authors
Citation
B. Ratanasthien, Association of oil source algae in some Tertiary basins, northern Thailand, J ASIAN E S, 17(1-2), 1999, pp. 295-299
Citations number
6
Categorie Soggetti
Earth Sciences
Journal title
JOURNAL OF ASIAN EARTH SCIENCES
ISSN journal
13679120 → ACNP
Volume
17
Issue
1-2
Year of publication
1999
Pages
295 - 299
Database
ISI
SICI code
1367-9120(199902/04)17:1-2<295:AOOSAI>2.0.ZU;2-X
Abstract
A coal petrographic study of sediments, including coals, oil shale, and oil source rocks, in the fossil fuel deposits of northern Thailand revealed ch anges in alginite associations. In the Lower part of these Tertiary deposit s, especially in the Fang oilfield, alginite A (a. Botryococcus sp.) was th e only type of alga found. Later, the association of Botryococcus braunii, Pila algae, thick-walled alginite B, and temperate palynomorphs were recogn ized in many coalfields, as well as in the middle part of the deposits in t he Fang Basin. Their ages were Late Oligocene (?) to Early Miocene. In the upper part of the fossil fuel deposits, alginite B is dominant in many basi ns, together with Botryococcus-related taxa such as Pila algae, Reinschia a nd fresh-water-dwelling ferns. In the Mae Sod Basins Reinschia was found to be dominant in the northern part, whereas lamaginite dominated in the sout h, showing different environmental conditions in different parts of the bas in during deposition. These different associations indicate changes in depo sitional environments in northern Thailand; resulting from climatic and/or sea level changes during Tertiary time, (C) 1999 Elsevier Science Ltd. All rights reserved.