Evidence for a relationship between hydrocarbons and authigenic magnetite

Elmore, R. Douglas; Engel, Michael H.; Crawford, L.; Nick, Kevin E.; Imbus, Scott W.; Sofer, Zvi

doi:10.1038/325428a0

Cited by 130 publications

(67 citation statements)

References 7 publications

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“…Magnetite formation appears to be associated with the biodegradation of hydrocarbon components, with the concurrent reduction of Fe(III) to ultrafine-grained magnetite and larger crystal aggregates (93,214). The capacity of dissimilatory Fe(III) reducers to metabolize a variety of hydrocarbon components has yet to be investigated.…”

Section: Generation Of Iron and Manganese Mineralsmentioning

confidence: 99%

Dissimilatory Fe(III) and Mn(IV) Reduction

Lovley

Holmes

Nevin

2004

Advances in Microbial Physiology

1,470

1,061

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Section: Generation Of Iron and Manganese Mineralsmentioning

confidence: 99%

Dissimilatory Fe(III) and Mn(IV) Reduction

Lovley

Holmes

Nevin

2004

Advances in Microbial Physiology

1,470

1,061

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“…The massive poikilotopic pyrite cement is a mesogenetic cement which is attributed to the reduction of iron oxides present in the sediments (hematite) in the presence of hydrocarbons (Elmore et al, 1987) especially gas in this case. …”

Section: Pyrite Cementmentioning

confidence: 99%

Diagenetic Factors Controlling Reservoir Quality in the Faraghan Formation (Lower Permian), Darang Field, Southern Iran

Zamanzadeh

Mirzaei

Abadi

et al. 2011

Energy Exploration & Exploitation

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The role of diagenesis in affecting (reduction or enhancement) reservoir quality in the Faraghan Formation in Darang #1 well was investigated. The Faraghan Formation is mainly composed of sandstone facies along with minor mudstone and siltstone and grades upward into mixed carbonate –siliciclastic facies and then to Dalan Formation carbonates. Depositional environment of this formation comprises various sub-environments of a delta setting in the lower part of the formation which grades upward into a shallow marine clastic environment in the upper part. The processes enhancing reservoir quality include dissolution of carbonate grains and cements and alteration of feldspar grains. Burial history diagram shows that after deposition during Lower Permain, the formation underwent a rapid burial up to 1000 meters below sea level in Upper Permian. Then a slight uplift (about 100 meters) and gradual burial followed up to Mid-Jurassic. Afterwards the formation experienced a series of rapid and moderate uplift from Mid-Jurassic to Tertiary when the formation uplifted to around 2500 meters above sea level. The suitable conditions resulting in dissolution took place in shallow buried sandstones. These conditions occurred two times during burial history: at the early stages of eodiagenesis and during telodiagenesis. The major processes deteriorating reservoir quality include compaction and cementation. Major cement types include carbonate cements (dolomite, siderite), clay cements (kaolinite, sericite, chlorite), silica cement and pyrite cement. The most abundant cement is the carbonate cement especially dolomite. The dolomite cement occurs as intergranular and poikilotopic forms. The most frequent clay cement is sericite which dominates in sitstones and lithicarenites. Silica cement, where present, fills all the pore spaces. The least frequent cement type is pyrite which is found in two forms of poikilotopic and framboidal. Where it is found in the form of poikilotopic cement, it massively fills the pore spaces and deteriorates the porosity and permeability of the sandstones.

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“…In fact, primary magnetizations in sedimentary basins could be partially or totally overprinted by late thermochemical events produced, not only by fluid motions associated to orogenic events, but also by the migration of oil and gas (Hall and Evans, 1995). Benthiem and Elmore (1987), McCabe et al (1987) and Elmore et al (1987Elmore et al ( , 1993 have identified, by scanning electronic microscopy (SEM), spherical aggregates of submicronic crystals of magnetite associated to solid bitumen and speleothems with hydrocarbon inclusions. These aggregates appear to be linked to crude oil biodegradation Copyright c The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences; TERRAPUB.…”

Section: Introductionmentioning

confidence: 99%

“…These aggregates appear to be linked to crude oil biodegradation Copyright c The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences; TERRAPUB. (McCabe et al, 1987;Elmore et al, 1987) or to inorganic chemical processes due to the presence of hydrocarbons (Elmore et al, 1993).…”

Section: Introductionmentioning

confidence: 99%

Hydrocarbon-induced magnetic contrasts in some Venezuelan and Colombian oil wells

et al. 2006

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In this work we present a review of our current research on the subject of near-surface hydrocarbon-induced magnetic contrasts. Samples are drill cuttings from number of Venezuelan and Colombian oil fields, and some soils from an oil prospective area. Results from rock magnetic, electronic paramagnetic resonance (EPR), extractable organic matter (EOM) and scanning electron microscopy (SEM) are discussed in light of new experiments. Two types of magnetic susceptibility (MS) anomalies have been recognized in oil well samples (i.e. A and B-like). A-like anomalies are probably associated to a reducing environment caused by the underlying reservoirs, whereas B-like anomalies might reflect lithological contrasts. Samples from A-like anomalous levels reveal the restrictive presence of authigenic spherical aggregates of submicronic Fe-rich magnetic crystals. Peaks of organic matter free radical concentration (OMFRC) and EOM are also observed at depth levels that lie close to those with A-like anomalies. Hysteresis ratios J rs /J s and H cr /H c could be used as additional criteria to recognize A-like magnetic contrasts. In soil samples, MS and OMFRC anomalies coincide with peaks of ethane concentration and an area underneath where source rock has reached appropriate conditions of pressure and temperature to generate hydrocarbons (Cretaceous kitchen). Different types of crude oils and subsurface structures could have also a direct effect on the observed amplitude of A-like anomalies.

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Evidence for a relationship between hydrocarbons and authigenic magnetite

Cited by 130 publications

References 7 publications

Dissimilatory Fe(III) and Mn(IV) Reduction

Dissimilatory Fe(III) and Mn(IV) Reduction

Diagenetic Factors Controlling Reservoir Quality in the Faraghan Formation (Lower Permian), Darang Field, Southern Iran

Hydrocarbon-induced magnetic contrasts in some Venezuelan and Colombian oil wells

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