Research Information System
SEDIMENTARY GEOLOGY, vol.72, pp.171-187, 1991 (SCI-Expanded)
Thrace is an intermontane basin and the sedimentary sequence encompasses a typical transgressive-regressive depositional cycle. We apply sedimentary organic facies as an accessory method to develop a distinctive sedimentary facies model of the Thrace Basin. This model suggests comparing the relative abundance of different types of kerogen with the associated sediment. We recognize four types of kerogen: (i) amorphous/algae; (ii) herbaceous; (iii) woody;, and (iv) coaly. The relative abundance and physical properties of the kerogens show close consistency with the sedimentary facies. Well preserved amorphous/algae material is associated mainly with shale, while degraded/oxidized woody material is dominant in siltstone and sandstone. Considering these phenomena we have composed organic-matter abundance charts along the transgressive-regressive sections in the wells. A good correlation exists between organic-matter type and sedimentation mode; the transgressive sections are represented by upward increasing amorphous/algae kerogens and, reversely, the regressive sections by increasing woody material. Vitrinite reflectance and the Spore Colour Index are used to define the thermal history of the basin. As a result, the close relation between organic matter features and sedimentary mode is considered as a useful parameter to clarify the sedimentary facies of the Thrace Basin.