Origin of oils in Po Basin, Northern Italy

Riva, A.; Salvatori, T.; Cavaliere, R.; Ricchiuto, T.; Novelli, L.

doi:10.1016/0146-6380(86)90038-0

Cited by 31 publications

(18 citation statements)

References 8 publications

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“…The Cortemaggiore group shows similar geochemical trends, but includes oils with different thermal evolutionary stage (Riva et al 1986). Both Salsomaggiore and Cortemaggiore oils indicate an oxic environment of deposition of marine/deltaic siliciclastic source rocks and include 18a(H)oleanane that derives from plants occurring since the Late Cretaceous and blooming in the Tertiary (Riva et al 1986). In literature, the Cortemaggiore group is considered as sourced by the same Tertiary foredeep unit that acts as reservoir (Riva et al 1986).…”

Section: Fluidsmentioning

confidence: 99%

“…The Salsomaggiore oil compositional characters were grouped by Riva et al (1986), together with other oils of the region, including the well-known Cortemaggiore field (Pieri 1992), into a so-called Cortemaggiore group. The Cortemaggiore group shows similar geochemical trends, but includes oils with different thermal evolutionary stage (Riva et al 1986).…”

Section: Fluidsmentioning

confidence: 99%

“…Both Salsomaggiore and Cortemaggiore oils indicate an oxic environment of deposition of marine/deltaic siliciclastic source rocks and include 18a(H)oleanane that derives from plants occurring since the Late Cretaceous and blooming in the Tertiary (Riva et al 1986). In literature, the Cortemaggiore group is considered as sourced by the same Tertiary foredeep unit that acts as reservoir (Riva et al 1986). This interpretation is questioned by the absence of organic-rich intervals in the Oligo-Miocene succession, that never reach a Total Organic Carbon (TOC) of .0.5%.…”

Section: Fluidsmentioning

confidence: 99%

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Spontaneous fluid emissions in the Northern Apennines: geochemistry, structures and implications for the petroleum system

Capozzi

Picotti

2010

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Natural seeps in the Northern Apennines document a variability of fluids and reservoirs in terms of origin, age and evolution. Their spatial distribution appears controlled by the presence or absence of the tectonic overburden provided by the Ligurian nappe. The general trend of deepening of the Mesozoic basement toward the internal part of the thrust belt is reflected by the nature of the seeps, characterized by thermogenic methane and oil at the foothills, whereas the innermost seeps show occurrence of dry thermogenic gas suggesting overcooking of the residual oil. At the front of the Ligurian nappe, or in places never covered by it, the seepages are associated with biogenic methane related to bacterial degradation of the organic-rich intervals occurring in the Pliocene and Pleistocene marine succession. The coupling of geochemical and structural analysis allows reconstructing the tectono-thermal evolution of the belt, improving our knowledge on the processes acting within the reservoir and controlling important parameters of the petroleum system, such as the reservoir porosity and its modifications, and the migration patterns.

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Section: Fluidsmentioning

confidence: 99%

Section: Fluidsmentioning

confidence: 99%

Section: Fluidsmentioning

confidence: 99%

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Spontaneous fluid emissions in the Northern Apennines: geochemistry, structures and implications for the petroleum system

Capozzi

Picotti

2010

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“…If we assume that the time-equivalent Perledo-Varenna Limestone was deposited in the same basin as the GBZ (Bernasconi 1991) and considering the extensional movements along the Upper Triassic-Liassic Lugano-Monte Grona line (Bertotti 1991), its maximum width would be approximately 20 km. No data are available on the extension of the basin towards the south, however, the geochemical characteristics ofthe Gaggiano oils from the Po Plain (Riva et al 1986) are very similar to those of the GBZ. This suggests that the GBZ, or a chain of basins with similar characteristics, extended toward the south.…”

Section: Geological Settingmentioning

confidence: 71%

Organic Geochemistry and Depositional Environment of a Hydrocarbon Source Rock: The Middle Triassic Grenzbitumenzone Formation, Southern Alps, Italy/Switzerland

Bernasconi

Riva

1993

Generation, Accumulation and Production of Europe’s Hydrocarbons III

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The Middle Triassic Grenzbitumenzone Formation is a 16-m-thick sequence of finely laminated, organic-rich dolomites and black shales. TOC contents reach 10% in the dolomites and 40% in the shales. Sedimentological and geochemical data suggest deposition in a shallow marine basin under permanently anoxic conditions. The organic matter is of type II. Based on geochemical parameters the Grenzbitumenzone can be divided into two sections. In the lower part, hopanes are present in very high concentrations (up to one order of magnitude higher than steranes) and the J13C of the TOC varies between -30.0 and -31.8%0 (PDB). Above 13 m from the base hopanes are scarce and the J I3 C of the TOC becomes less negative. Sedimentological and geochemical data suggest that a planktonic "bacterial plate" developed at the oxic-anoxic boundary in the water column and that bacteria were a significant contributor to the primary organic matter production in the basin. Variations in the maturity-dependent Ts{Tm ratio and 20S/20R C29 sterane isomerization ratio occur over thicknesses of a few metres. Their correlation with the carbon isotope composition of the extracts suggests that the scatter may be related to changes in organic matter input and/or bacterial activity during early diagenesis and not to differences in maturity.

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“…18a(H)-oleanane has been identified in deltaic sediments (e.g., Ekweozor et al, 1979a;Hoffmann et al, 1984;Riva et al, 1986) and in a number of crude oils mostly related to deltaic sediments (e.g., Ekweozor et al 1979b;Hoffmann et al, 1984;Philp and Gilbert, 1986;Riva et al, 1986;Talukdar et al, 1986;Zumberge, 1987 and references therein). A diagenetic pathway involving taraxerene to oleanene conversion can explain why no triterpanes with a taraxerane skeleton are found in sediments or oils with a pronounced terrigenous molecular signal and why oleananes are encountered.…”

Section: Diagenetic Transformationsmentioning

confidence: 99%

Oleanene, Ursene, and Other Terrigenous Triterpenoid Biological-Marker Hydrocarbons in Baffin Bay Sediments

Haven¹,

Rullkötter²

1989

Proceedings of the Ocean Drilling Program

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The aliphatic hydrocarbon fractions of eight early Miocene to Pliocene sediment samples from Hole 645E (Baffin Bay; ODP Leg 105) were investigated by gas chromatography and gas chromatography/mass spectrometry. Long, straight-chain alkanes of terrigenous origin are often present as major compounds. Other terrigenous biological markers include three oleanenes with a double bond at positions 12, 13(18), or 18, and taraxer-14-ene. Urs-12-ene is identified tentatively. In the three deepest samples, 17a(H), 18a(H), and 210(H)-28, 30-bisnorhopane is the most abundant compound. Several new compounds were detected, some of which are tentatively identified. The identification and possible significance of 23-norlupane, three A/B-ring nuclear demethylated (or A-nor-) oleanenes, and an A/B-ring nuclear demethylated (or A-nor-) urs-12-ene are discussed. The authors postulate that taraxer-14-ene isomerizes to olean-12-ene with increasing burial depth.

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Origin of oils in Po Basin, Northern Italy

Cited by 31 publications

References 8 publications

Spontaneous fluid emissions in the Northern Apennines: geochemistry, structures and implications for the petroleum system

Spontaneous fluid emissions in the Northern Apennines: geochemistry, structures and implications for the petroleum system

Organic Geochemistry and Depositional Environment of a Hydrocarbon Source Rock: The Middle Triassic Grenzbitumenzone Formation, Southern Alps, Italy/Switzerland

Oleanene, Ursene, and Other Terrigenous Triterpenoid Biological-Marker Hydrocarbons in Baffin Bay Sediments

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