Significance of ODP results on deepwater hydrocarbon exploration – Eastern equatorial Atlantic region

Katz, Barry J.

doi:10.1016/j.jafrearsci.2006.06.004

Cited by 12 publications

(8 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3). Similar cyclicity has been observed elsewhere along the West African margin (Oboh-Ikuenobe et al, 1999;Wagner, 2002;Hofmann et al, 2003;Wagner et al, 2004;Beckmann et al, 2005;Katz, 2006), and is thought to be a result of variations in productivity and/or preservation possibly linked to orbital forcing.…”

Section: Discussionsupporting

confidence: 78%

“…Additional but important information may however be obtained if data and/or samples are available from ocean drilling programmes such as the Deep Sea Drilling Project (DSDP), Ocean Drilling Program (ODP), and Integrated Ocean Drilling Program (IODP). In fact, such data and samples offer a number of technical advantages over samples typically available from commercial wells; for example, samples are contaminant-free and physically well-constrained because of the use of seawater as the primary drilling fluid and the sub-continuous nature of the cores (Katz, 2006). Thus DSDP Site 369A provided an opportunity to examine the detailed stratigraphy and hydrocarbon source rock potential of the Aaiun-Tarfaya Basin, offshore NW Africa (Fig.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

HYDROCARBON SOURCE ROCK ASSESSMENT AND REVISED BIOSTRATIGRAPHY OF DSDP SITE 369A, OFFSHORE NORTHWEST AFRICAN MARGIN

Cool

Katz

Dignes

et al. 2008

Journal of Petroleum Geology

View full text Add to dashboard Cite

Deep Sea Drilling Project (DSDP) Site 369A, drilled off Cape Bajador, NW Africa, provided an opportunity to examine the source rock potential and biostratigraphy of the offshore Aaiun‐Tarfaya Basin. Within the Albian‐Campanian interval, total organic carbon (TOC) contents were found to be highly variable and cyclic, ranging from less than 0.5% to nearly 12%. Variations in hydrocarbon generation potential (S1 + S2) versus depth in general paralleled variations in TOC. Organic matter was generally marine in origin and oil‐prone. The newly generated data reported in this paper expand the range of TOC values which have been reported from the study region. However, they also illustrate the kinds of problems which can be introduced as a result of sampling bias. Sampling for this study tended to focus on darker‐coloured, more organic‐rich lithologic core intervals, contrasting with previous shipboard analyses which appeared to have focused on lighter‐coloured intervals. Based on the abundance of calcareous nannofossils, the elevated TOC contents appear to have been, at least partly, driven by elevated surface productivity which in turn increased biological oxygen demand within the sediment. New biostratigraphic data was used to identify an unconformity between the late Albianl early Cenomanian and the early Campanian successions, consistent with previous interpretations. Integration of the geochemical and biostratigraphic datasets indicates that these organic‐rich sediments are in general equivalent to Cretaceous Oceanic Anoxic Events 1B, 1D and 3. Considering the apparent net thickness of these oil‐prone sediments and the possibility that they may be widely distributed throughout the basin, they may have the potential to generate commercially significant volumes of oil where buried sufficiently deeply.

show abstract

Section: Discussionsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

HYDROCARBON SOURCE ROCK ASSESSMENT AND REVISED BIOSTRATIGRAPHY OF DSDP SITE 369A, OFFSHORE NORTHWEST AFRICAN MARGIN

Cool

Katz

Dignes

et al. 2008

Journal of Petroleum Geology

View full text Add to dashboard Cite

show abstract

“…While the primary data presented here are isolated to a single site, there is evidence that an episode of organic carbon burial on the West African margin may be more widespread. Petroleum and source rock geochemistry indicate that the late Eocene, organic‐rich unit at ODP Site 959 may be correlative with a producing source rock in the Niger Delta where it is more deeply buried [ Katz , 2006]. Logging data acquired at ODP Site 959 partially compensate for the poor recovery through the EOT by providing a continuous record of U concentrations in ODP 959D (Figure 5).…”

Section: Resultsmentioning

confidence: 99%

Os isotope chemostratigraphy applied to organic‐rich marine sediments from the Eocene‐Oligocene transition on the West African margin (ODP Site 959)

Ravizza

Paquay

2008

Paleoceanography

View full text Add to dashboard Cite

[1] The known temporal relationship between the benthic foraminiferal d18 O record and the marine Os isotope record is used to reinterpret the absolute chronology and paleoceanographic context of an episode of organic carbon burial on the West African margin Ocean Drilling Program (ODP) Site 959. Although organic-rich sediments require significant corrections for in situ decay of 187 Re to 187 Os, these results demonstrate the utility of the marine Os isotope record for chemostratigraphic correlation of organic-rich sediments that are devoid of age diagnostic microfossils with pelagic carbonate sequences. Revision of the ODP Site 959 chronology shifts the age assignment of an interval of biosiliceous, organic-rich sediment deposition from the Oligocene to the late Eocene and earliest Oligocene, likely culminating with the first major glaciation of the Oligocene (Oi1). We speculate that enhanced organic carbon burial over much of the West African margin may have contributed to drawdown of atmospheric carbon dioxide before and during the Oi1 event and suggest that Os isotope chemostratigraphy provides a valuable tool for further exploring this possibility.Citation: Ravizza, G., and F. Paquay (2008), Os isotope chemostratigraphy applied to organic-rich marine sediments from the Eocene-Oligocene transition on the West African margin (ODP Site 959), Paleoceanography, 23, PA2204,

show abstract

“…In all samples PY is higher than 2 kg HC (t rock) -1 which is considered as a limiting value for a possible oil source rock. 32,33 Comparing the obtained PY values with reference data, as well as based on the PY vs. TOC diagram (Fig. 1), almost all samples have excellent, D4 and D7 have good, whereas only the sample D6 has a fair to good source rock generative potential.…”

Section: Hydrocarbon Generative Potentialmentioning

confidence: 84%

The influence of pyrolysis type on shale oil generation and its composition (upper layer of Aleksinac oil shale, Serbia)

Gajica

Šajnović

Stojanović

et al. 2017

JSCS

View full text Add to dashboard Cite

The influence of pyrolysis type on the shale oil generation and its composition was studied. Different methods such as Rock-Eval pyrolysis, thermogravimetric analysis (TGA) and pyrolysis in the open and closed systems were applied. Samples from the Upper layer of Aleksinac oil shale (Serbia) were used as a substrate and first time characterized in detail. The impact of kerogen content and type on the shale oil generation in different pyrolysis systems was also estimated. Majority of the analysed samples have total organic carbon content > 5 wt. % and contain oil prone kerogen types I and/or II. Therefore, they can be of particular interest for the pyrolytic processing. The thermal behaviour of analysed samples obtained by TGA is in agreement with Rock-Eval parameters. The pyrolysis of oil shale in the open system gives higher yield of shale oil than the pyrolysis in the closed system. The yield of hydrocarbons (HCs) in shale oil produced by the open pyrolysis system corresponds to an excellent source rock potential, while HCs yield from the closed system indicates a very good source rock potential. The kerogen content has a greater impact on the shale oil generation than kerogen type in the open pyrolysis system, while kerogen type plays a more important role on the generation of shale oil than the kerogen content in the closed system. The composition of the obtained shale oil showed certain undesirable features, due to the relatively high contents of olefinic HCs (open system) and polar compounds (closed system), which may require further treatment to be used.

show abstract

Significance of ODP results on deepwater hydrocarbon exploration – Eastern equatorial Atlantic region

Cited by 12 publications

References 27 publications

HYDROCARBON SOURCE ROCK ASSESSMENT AND REVISED BIOSTRATIGRAPHY OF DSDP SITE 369A, OFFSHORE NORTHWEST AFRICAN MARGIN

HYDROCARBON SOURCE ROCK ASSESSMENT AND REVISED BIOSTRATIGRAPHY OF DSDP SITE 369A, OFFSHORE NORTHWEST AFRICAN MARGIN

Os isotope chemostratigraphy applied to organic‐rich marine sediments from the Eocene‐Oligocene transition on the West African margin (ODP Site 959)

The influence of pyrolysis type on shale oil generation and its composition (upper layer of Aleksinac oil shale, Serbia)

Contact Info

Product

Resources

About