Gas-source rock correlation in Thrace basin, Turkey

Hoşgörmez, Hakan; Yalçın, Mehmet

doi:10.1016/j.marpetgeo.2005.04.002

Cited by 33 publications

(19 citation statements)

References 17 publications

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“…C -Geological map of Gökçeada Island (based on Temel and Çiftçi 2002). Location of the studied section indicated composed mostly of mudstones, siltstones and thin-or medium-bedded, poorly sorted sandstones that are important source rocks for gas (Karahanoğlu et al 1995;Hoşgörmez and Yalçın 2005). The Mezardere Formation overlies sandy flysch deposits of the Keşan Formation (middle-upper Eocene) or shaley-sandy flysch deposits with tuffites of the Ceylan Formation (upper Eocene), and is overlain by delta front sediments with coals, limestones and volcanics of the Osmancık Formation (Siyako 2006).…”

Section: Geological Settingmentioning

confidence: 99%

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The miniature echinoid trace fossil Bichordites kuzunensis isp. nov. from early Oligocene prodelta sediments of the Mezardere Formation, Gökçeada Island, NW Turkey

Demírcan¹,

Uchman²

2012

Acta Geologica Polonica

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ABSTRACT:Demírcan, H. and Uchman, A. 2012. The miniature echinoid trace fossil Bichordites kuzunensis isp. nov. from early Oligocene prodelta sediments of the Mezardere Formation, Gökçeada Island, northwest Turkey. Acta Geologica Polonica, 62 (2), 205-215. Warszawa.The pascichnial trace fossil Bichordites kuzunensis isp. nov. occurs as an epichnial complex structure in early Oligocene prodelta sediments of the Thrace Basin in Gökçeada Island, northwest Turkey. It displays characteristics of irregular echinoid burrows such as overall shape and a double meniscate filling with a chevron dorsal suture, in addition to the feature typical of the so far monospecific Bichordites Plaziat and Mahmoudi, 1988, that is a single central core around a single drainage tube. Its miniature size can be related to the small size of the tracemaker (ontogenic feature) or to its dwarfism in a stressed deltaic environment (palaeoecological feature). Its occurrence indicates a period of fully marine conditions during accumulation of the deltaic sediments of the Mezardere Formation. It is composed mostly of thinly-bedded lightgrey calcareous mudstones and siltstones, which display shale fissility, fine parallel lamination or rarely ripple lamination. Locally, carbonate concretions are present. The fine-grained sediments are intercalated with isolated thin beds of very fine-or fine-grained, slightly muscovitic sandstones, which display parallel lamination in the lower part and ripple lamination in the upper part, or only ripple lamination. Fine carbonized plant detritus is dispersed in the sandstones. The palynomorphs indicate a late Eocene-early Oligocene age (Ediger and Alişan 1989;Batı et al. 1993Batı et al. , 2002). An early Oligocene age is also documented by dinocysts (Temel and Ciftici 2002). In many parts of the island, the Mezardere Formation is intruded by volcanic rocks.The deposits of the Mezardere Formation are generally interpreted as representing a deltaic environment, from delta front to prodelta (Temel and Çiftçi 2002), or to prodelta only (Siyako and Huvaz 2007). In Gökçeada Island, the Mezardere Formation is dominated by the prodelta facies, with a 50-80 m water depth estimated by basin modelling (Hoşgörmez and Yalçın 2005). Locally, sandstones of distal or even proximal mouth bars are present.A 12 m thick succession, dated as early Oligocene, was measured in the upper part of the Mezardere Formation (Text-fig. 1B). It crops out in scarps and small gorges along the road running NW of Kuzulimanı harbour (Text- fig. 2A; GPS co-ordinates: N40°13.732'; E025°56.719'; ±5 m). Bluish-grey marly mudstones are sporadically intercalated with thin, rarely mediumand thick-bedded sandstones. The presence of sandstone beds suggests an upper prodelta setting influenced by mouth bars.The studied trace fossil occurs in four beds (Text- fig. 1B), which are, from bottom to top, 3.5, 7, 2.5, and 4 cm thick. The lowest bed is fine-grained, parallel laminated in the lower part and ripple laminated in the upper part. Its lower surface is even...

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Section: Geological Settingmentioning

confidence: 99%

“…In Gökçeada Island, the Mezardere Formation is dominated by the prodelta facies, with a 50-80 m water depth estimated by basin modelling (Hoşgörmez and Yalçın 2005). Locally, sandstones of distal or even proximal mouth bars are present.…”

Section: Introductionmentioning

confidence: 99%

The miniature echinoid trace fossil Bichordites kuzunensis isp. nov. from early Oligocene prodelta sediments of the Mezardere Formation, Gökçeada Island, NW Turkey

Demírcan¹,

Uchman²

2012

Acta Geologica Polonica

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“…Generally speaking, there are some differences between natural gases and gaseous hydrocarbons from thermal simulations including different source materials and maturities (Schenka and Dieckmann, 2004;Hosgormez and Yalcin, 2005). But the two kinds of gases are similar in composition, especially in the C 6-7 components and they are from similar organic matter and of similar maturities.…”

Section: Comparison Between Gaseous Hydrocarbons Generated From Thermmentioning

confidence: 99%

“…Since the maturities of natural gases are similar to those of simulated gases generated at 550℃, seven parameters selected from the gas GC analysis (Table 3) represent the type of organic matter and their maturity (Hosgormez and Yalcin, 2005;Thompson, 1979;Shen Ping et al, 1992;Hu Tilin et al, 1990). Relationship between simulated gases and natural gases based on seven parameters (Table 3) is described in Table 4.…”

Section: Relationship Between Simulated Gases and Natural Gasesmentioning

confidence: 99%

Interaction between source rock and evaporite: A case study of natural gas generation in the northern Dongying Depression

et al. 2010

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It is well known that oil generated from source rocks of saline-lake facies is characteristic of low Pr/Ph ratio and high contents of gammacerane. The authors found that gas generated from the same source rocks was high in benzene and cyclohexane contents and had light carbon isotope compositions. In this study, a series of thermal simulations of gas generations on source rock with/without evaporites (such as carbonate, gypsum, and sodium chlorite, respectively), were conducted. It was found that the gypsum played an important role on the catalyzsis of gas generation in the thermal simulations. Compositions of the gaseous hydrocarbons generated from source rocks with evaporites are very similar to those of natural gases discovered from northern Dongying Depression. Meanwhile, in the thermal simulations, it was found that the carbon isotopic compositions of gaseous hydrocarbons generated from source rocks with evaporites are lighter than those of the gases from source rocks without evaporites. Therefore, it is concluded that natural gases discovered from northern Dongying Depression are the product of interaction between source rocks and evaporites (especially gypsum) of the saline facies.

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“…The Thrace Basin, with as much as 9,000 meters of Eocene to Holocene sedimentary rock in the basin center, is interpreted as a supradetachment basin formed on an exhumed and extended Rhodope metamorphic complex that was subsequently modified by Neogene strikeslip deformation (Kilias and others, 2013). Shales of the Eocene Hamitabat Formation are the principal petroleum source rocks in the Thrace Basin (Hoşgörmez and Yalҫin, 2005;Gürgey, 2009); other potential source rocks include shales of the Eocene Ceylan Formation, Oligocene Mezardere Formation, and Oligocene coals (for biogenic gas) of the Danişmen and Osmancik formations. The USGS defined a Paleogene Composite Total Petroleum System (TPS) that includes the (1) Paleogene Conventional Reservoirs Assessment Unit (AU); (2) Paleogene Tight Gas AU; and (3) Mezardere Shale Oil AU.…”

Section: Introductionmentioning

confidence: 99%