Depositional environment and hydrocarbon source potential of the Oligocene Ruslar Formation (Kamchia Depression; Western Black Sea)

Sachsenhofer, Reinhard F.; Stummer, Barbara; Georgiev, Georgi V.; Dellmour, Rudolf; Bechtel, Achim; Gratzer, Reinhard; Ćorić, Stepan

doi:10.1016/j.marpetgeo.2007.08.004

Cited by 51 publications

(68 citation statements)

References 58 publications

(47 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2). Submarine mass movements occurred during deposition of the Eggerding Formation (Sachsenhofer and Schulz, 2006;Sachsenhofer et al, 2010). During Late Oligocene to Early Miocene times dee-per marine conditions persisted E of Munich (Puchkirchen Basin), whereas a deltaic complex filled the western part of the North Alpine Foreland Basin (De Ruig, 2003).…”

Section: Basin Fillmentioning

confidence: 99%

“…microscopy, X-ray diffractometry, cathodoluminiscense, SEM) were applied to establish the mineralogy and diagenetic history of the siliciclastics. Bulk geochemical data (carbon, sulphur, RockEval pyrolysis) from fine-grained rocks were measured according to established procedures (see Sachsenhofer et al, 2010).…”

Section: Analytical Workmentioning

confidence: 99%

“…In the remaining part, the Lower Oligocene succession is missing due to large submarine mass movements Sachsenhofer et al, 2010). Nowadays this material is located beneath the Alpine nappes.…”

Section: Cenozoic Successionmentioning

confidence: 99%

See 2 more Smart Citations

The Trattnach Oil Field in the North Alpine Foreland Basin (Austria)

Groß¹,

Sachsenhofer²,

Rech³

et al. 2015

AJES

View full text Add to dashboard Cite

The Trattnach Field, located in the Upper Austrian part of the North Alpine Foreland Basin produces oil from a depth of about 1600 m since the 1970s. Within an industry-university cooperation RAG provided drill cores, geological and geophysical data, in-2 cluding a 70 km seismic cube, to Montanuniversität Leoben. Results of several studies based on this data set are summarized in the present paper.Sedimentation in the Trattnach area commenced during Jurassic time with clastic sediments and platform carbonates. The latter became karstified during the Early Cretaceous. Non-marine sediments (Schutzfels Formation) filled karst structures. Shallow marine Cenomanian sediments (Regensburg Formation), about 30 m thick, overlie Schutzfels Formation or Jurassic carbonates and often start with a transgressive conglomerate. The dominant lithology is highly bioturbated glauconite rich sandstone. A reddish conglomerate ("marker bed") and calcareous sandstones occur in the upper part. Tempestites and debris flows are frequent. Turonian calcareous shales (Eibrunn Formation) overlie the Cenomanian sediments.The oldest structural elements visible in the Trattnach 3D cube are related to Turonian/Coniacian E-W compression, a consequence of the opening of the N-Atlantic. Paleocene NE-SW compression, related to the closure of the Penninic Ocean, caused the formation of the Trattnach Mega-Anticline and transpressional reactivation of the NNW-SSE trending late Variscan Schwanenstadt fault system. Eocene clastic and carbonate rocks overlie the Mesozoic succession with an angular unconformity. Fine-grained rocks follow above the Eocene carbonates. Locally, these sediments were removed by extensive Lower Oligocene submarine slides. Another unconformity separates the Upper Puchkirchen Formation (Egerian) from the Hall Formation (Eggenburgian).E-W trending normal faulting (Aistersheim and Gaspoltshofen fault systems) related to flexural down-bending is the main Cenozoic tectonic event. Both fault systems were activated during earliest Oligocene time. Fault activity decreased during Egerian time and ended before the Eggenburgian. Seismic data provide evidence for rotation of the fault block confined by the Aistersheim and Gaspoltshofen faults during late Oligocene (early Egerian) time.The Trattnach Field is located within the Trattnach Anticlinal Dome. Its western boundary is formed by the Schwanenstadt fault system. The Trattnach Field produces oil from the lower part of the Cenomanian green sandstones (CE3, CE2). Reservoir quality is controlled by grain size, clay mineral and carbonate cement. The seal is formed by Cenomanian rocks with low permeability (CE1) and Turonian calcareous shales. The Trattnach oil has low sulfur content and is undersaturated with respect to gas. Oil accumulation commenced during Miocene time. Oil field water with low salinity indicates a hydraulic connection with meteoric water within Jurassic carbonate rocks.

show abstract

Section: Basin Fillmentioning

confidence: 99%

Section: Analytical Workmentioning

confidence: 99%

See 1 more Smart Citation

The Trattnach Oil Field in the North Alpine Foreland Basin (Austria)

Groß¹,

Sachsenhofer²,

Rech³

et al. 2015

AJES

View full text Add to dashboard Cite

show abstract

“…Within the Austrian sector of the NAFB, a thermogenic and a microbial petroleum system can be distinguished: _________________ ______ ___________________________ _______ 1) Lower Oligocene deep-water sediments (Schöneck, Dynow, Eggerding formations; Schulz et al 2002;Sachsenhofer & Schulz, 2006;Sachsenhofer et al 2010) are the main source rocks of the thermogenic petroleum system with oil and minor thermogenic gas. Hydrocarbon generation started in Miocene times, when the Alpine nappes started to overthrust the southern NAFB and ended about 5 Ma ago due to uplift and cooling (Gusterhuber et al, 2013(Gusterhuber et al, , 2014.…”

Section: Hydrocarbon Systemmentioning

confidence: 99%

Carbonate cementation in Upper Eocene clastic reservoir rocks from the North Alpine Foreland Basin (Austria)

Grundtner¹,

Groß²,

Gratzer³

et al. 2017

AJES

View full text Add to dashboard Cite

A strong relationship between carbonate precipitation and microbial gas generation is evident for the Upper Eocene reservoir rocks of the North Alpine Foreland Basin. To achieve a better understanding of this relationship, 40 samples of limnic to shallow marine, gas-, oil-and water-bearing sandstones were studied to determine mineralogy and diagenetic history. The specific mineral parageneses were used to reconstruct changes in the hydrogeochemical conditions over time. Thus, authigenic mineral phases within reservoir rocks are an important archive for the reconstruction of pore fluid composition changes.The eogenetic pore space evolution of investigated Eocene sandstones is influenced by their primary mineralogy, which is strongly controlled by (i) depositional environment, (ii) detrital input and (iii) transport distances. Thus, a low compositional maturity is associated with high feldspar and high clay mineral content. Authigenic clay minerals, formed during several stages of diagenesis, play an important role for reservoir quality, due to pore space reduction.During eogenesis, authigenic micritic and sparitic carbonate phases are precipitated, which decreases the pore space. These eogenetic carbonate cements exhibit isotope values of about δ C: -5.9 to +2.2‰ and O: -8.3 to -4.3‰ [VPDB]. Some of these sam- 18ples indicate a trend towards lighter δ O values (-17.2‰), which is attributed to meteoric flush.Within the Eocene sandstones, two types of strongly cemented zones with low permeabilities can be differentiated: (i) extraordi- 13nary light δ C (-28.4‰) carbonates, which formed due to degradation of organic matter at the stage of advanced sulfate reduc- 13tion and (ii) heavy δ C (δ C: +8.7‰), which precipitated at the fermentation zone. Within the reservoir sandstones telogenesis is characterized by mineral destabilization (e.g. carbonate and feldspar corrosion) and kaolinite precipitation. The formation of authigenic kaolinite booklets resulted into a decrease in porosity.

show abstract

“…The earliest way to evaluate TOC content was measuring from core samples directly in the laboratory; however, this method depended significantly on variations within the core samples, and the result profile wasn't continuous. Organic shale formations respond to gamma ray, porosity and resistivity logs differently than the surrounding rocks and wireline logs started to be used to evaluate the source rock potential [1][2][3][4]. The wireline log-based TOC content evaluation can provide continuous and in-situ results of the target formation.…”

Section: Introductionmentioning

confidence: 99%

Dual-shale-content method for total organic carbon content evaluation from wireline logs in organic shale

2017

View full text Add to dashboard Cite

Organic shale is one of the most important unconventional resources all around the world. Total organic carbon (TOC) content is an important evaluation parameter of reservoir hydrocarbon source quality. The regular evaluation methods have higher requirements of well logs and core experiment data for statistical regression. Through analyzing the resistivity and gamma ray logging response characteristics of shale content and organic matters, combined with digital rock physics experiment simulation, we put forward and improve the dual-shale-content method for TOC content logging evaluation. The accuracy of this method is verified by actual data processing. The result shows the dual-shale-content method is simple to use and the error is small. And by comparing with the calculation results by using the ∆LogR method, it is revealed that the trend of the TOC content calculated by our method agrees with the core results better. This new method is suitable for the evaluation of TOC content in the area or interval where there is only conventional logs.

show abstract

Depositional environment and hydrocarbon source potential of the Oligocene Ruslar Formation (Kamchia Depression; Western Black Sea)

Cited by 51 publications

References 58 publications

The Trattnach Oil Field in the North Alpine Foreland Basin (Austria)

The Trattnach Oil Field in the North Alpine Foreland Basin (Austria)

Carbonate cementation in Upper Eocene clastic reservoir rocks from the North Alpine Foreland Basin (Austria)

Dual-shale-content method for total organic carbon content evaluation from wireline logs in organic shale

Contact Info

Product

Resources

About