Year 2018, Volume 27, Issue 5, Pages 349 - 383 2018-09-28

Palynological and petroleum geochemical assessment of the Lower Oligocene Mezardere Formation, Thrace Basin, NW Turkey

Kadir GÜRGEY [1] , Zühtü BATI [2]

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  The Oligocene clastic sequence of the Mezardere Formation (MF) with laterally variable organic richness has long been known as a proven source of gas with minor oil accumulations across the Thrace Basin of northwest Turkey. However, based on well data for the thick MF, neither detailed work in relation to age dating and stratigraphy nor a close linkage between the depositional facies/ environments, organic richness/organic proxies, and cyclicity has been established yet. In the present study, the MF was informally subdivided into Lower MF (LMF) and Upper MF (UMF) based on the distinct differences in palynological and geochemical data. Based on the common occurrences of Glaphyrocysta cf. semitecta and absence of Wetzeliella gochtii, the LMF is considered to be deposited during the earliest Oligocene (?Pshekian) under the prevailing marine conditions. The UMF is characterized by a very rich and diverse dinocyst assemblage having abundant occurrences of age-diagnostic Wetzeliella gochtii and a Solenovian age is assigned. Common Pediastrum occurrences in the UMF may suggest fresh water input as is the case for many source rocks of the Central and Eastern Paratethys. The UMF shows the geochemical characteristics of a typical transgressive sequence such as higher TOC, hydrogen index (HI), and relative hydrocarbon potential (RHP) values than those for the regressive LMF. On the RHP basis, three short-term transgressive to regressive cycles are recognized in the entire MF in the wells studied. The early mature UMF samples showed a fair to good source rock potential (average TOC = 1.14 wt. %; HI = 283 mg oil/g TOC) and low to moderate genetic petroleum potential (GP = 3.65 mg oil/g rock) and source potential index (SPI = 1.44 t oil/m2). The LMF samples were not evaluated due to their apparently low TOC, HI, and S2 values. Better understanding of the MF will eventually aid a better understanding of the paleoenvironment of the Eastern Paratethys.

Thrace Basin, Lower Oligocene, Wetzeliella gochtii, transgression, regression, source rock
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Primary Language en
Subjects Engineering
Journal Section Articles

Orcid: 0000-0001-6255-1084
Author: Kadir GÜRGEY

Orcid: 0000-0002-4773-0663
Author: Zühtü BATI

Bibtex @research article { tbtkearth473914, journal = {Turkish Journal of Earth Sciences}, issn = {1300-0985}, eissn = {1303-619X}, address = {TUBITAK}, year = {2018}, volume = {27}, pages = {349 - 383}, doi = {}, title = {Palynological and petroleum geochemical assessment of the Lower Oligocene Mezardere Formation, Thrace Basin, NW Turkey}, key = {cite}, author = {GÜRGEY, Kadir and BATI, Zühtü} }
APA GÜRGEY, K , BATI, Z . (2018). Palynological and petroleum geochemical assessment of the Lower Oligocene Mezardere Formation, Thrace Basin, NW Turkey. Turkish Journal of Earth Sciences, 27 (5), 349-383. Retrieved from
MLA GÜRGEY, K , BATI, Z . "Palynological and petroleum geochemical assessment of the Lower Oligocene Mezardere Formation, Thrace Basin, NW Turkey". Turkish Journal of Earth Sciences 27 (2018): 349-383 <>
Chicago GÜRGEY, K , BATI, Z . "Palynological and petroleum geochemical assessment of the Lower Oligocene Mezardere Formation, Thrace Basin, NW Turkey". Turkish Journal of Earth Sciences 27 (2018): 349-383
RIS TY - JOUR T1 - Palynological and petroleum geochemical assessment of the Lower Oligocene Mezardere Formation, Thrace Basin, NW Turkey AU - Kadir GÜRGEY , Zühtü BATI Y1 - 2018 PY - 2018 N1 - DO - T2 - Turkish Journal of Earth Sciences JF - Journal JO - JOR SP - 349 EP - 383 VL - 27 IS - 5 SN - 1300-0985-1303-619X M3 - UR - Y2 - 2018 ER -
EndNote %0 Turkish Journal of Earth Sciences Palynological and petroleum geochemical assessment of the Lower Oligocene Mezardere Formation, Thrace Basin, NW Turkey %A Kadir GÜRGEY , Zühtü BATI %T Palynological and petroleum geochemical assessment of the Lower Oligocene Mezardere Formation, Thrace Basin, NW Turkey %D 2018 %J Turkish Journal of Earth Sciences %P 1300-0985-1303-619X %V 27 %N 5 %R %U
ISNAD GÜRGEY, Kadir , BATI, Zühtü . "Palynological and petroleum geochemical assessment of the Lower Oligocene Mezardere Formation, Thrace Basin, NW Turkey". Turkish Journal of Earth Sciences 27 / 5 (September 2018): 349-383.