Lacustrine organic facies. A biomarker study using multivariate statistical analysis

Irwin, Hilary; Meyer, Trygve

doi:10.1016/0146-6380(90)90040-7

Cited by 49 publications

(21 citation statements)

References 20 publications

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“…Several studies have mapped present day maturation distributions of organicrich lacustrine sedimentary rocks throughout the Orcadian Basin in an attempt to understand basin evolution and assess potential for hydrocarbon generation. These studies (Parnell, 1985;Irwin and Meyer, 1990;Hillier and Marshall, 1992;Duncan and Buxton, 1995) have shown an extreme range in maturity across the Orcadian Basin where VR values (records of maximum palaeotemperature) range from 0.5% to 10.5% R o (Hillier and Marshall, 1992). Within this range in maturity, the overall pattern is one of sharply juxtaposed regions of high and low maturity.…”

Section: Orcadian Basinmentioning

confidence: 94%

Late Palaeozoic hydrocarbon migration through the Clair field, West of Shetland, UK Atlantic margin

Mark

Green²,

Parnell

et al. 2008

Geochimica et Cosmochimica Acta

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Section: Orcadian Basinmentioning

confidence: 94%

Late Palaeozoic hydrocarbon migration through the Clair field, West of Shetland, UK Atlantic margin

Mark

Green²,

Parnell

et al. 2008

Geochimica et Cosmochimica Acta

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“…The most prominent of these compounds is b-carotane (perhydrob-carotene), the fully saturated form of b-carotene (Peters et al 2005). One of the first biomarkers to be identified (Murphy et al 1967), b-carotane is associated primarily with anoxic, saline lacustrine or restricted marine settings where organisms such as the unicellular algae Dunaliella bloom and thrive as the dominant biota (Hall & Douglas 1983;Jiang & Fowler 1986;Irwin & Meyer 1990;Fu Jiamo et al 1990). These halotolerant algae synthesize massive amounts of b-carotene (up to 10% of their cellular mass) to prevent photoinhibition (Ben-Amotz et al 1989;Avreon & Ben-Amotz 1992).…”

Section: Molecular Composition Of Hydrocarbonsmentioning

confidence: 99%

Stable isotopes of organics and inorganics, clay mineralogy and chemical environment of an Aptian lacustrine succession in northeastern Brazil

Gratzer

Neumann

Vortisch

et al. 2013

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The studied Aptian lacustrine succession of the continental Jatobá Rift Basin varies mainly between pure carbonates (predominantly laminated limestones), marls and shales, with some intercalations of presumably deltaic sandstone complexes. In accordance with geochemical data, the occurrence of dolomite indicates intensive microbial activity in a stratified water column with slightly enhanced salinity. Petrographic data prove mild weathering conditions. Aggregates of authigenic smectite observed in sandstones, probably representing transformed volcanogenic glass particles, strongly indicate explosive volcanic activity. Occasionally occurring dolomite seems to have been formed due to intensive microbial activity under moderately increased salinity conditions. Potential hydrocarbon source rocks containing Type I organic matter (OM) were deposited during various phases of the Aptian. Enhanced biological productivity is indicated by bulk organic geochemical data (C org , hydrogen index, extraction yield) and d 13 C values of carbonates within peletoidal and laminated limestone layers. Carbon-isotope ratios of carbonates argue for OM cycling and remineralization. High d 18 O values of carbonates are attributed to periods of lower lake levels. A major contribution of aquatic organisms (green algae, microalgae, zooplankton) and minor input from macrophytes and land plants to OM accumulation is indicated by n-alkane distributions, steroid composition and d 13 C values of individual biomarkers. Microbial communities included heterotrophic bacteria and cyanobacteria, as well as purple and green sulphur bacteria. The sediments were deposited in an alkaline palaeolake. Highly reducing (saline) bottom water conditions and a stratified water column existed during OM accumulation of the Crato Formation. This is indicated by low pristane/phytane, gammacerane index, and the presence of b-carotane and aryl isoprenoids. Differences in OM composition and stable isotope data reflect the evolution of the basin from a stratified saline lake to a freshwater environment with limited potential for OM preservation.

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“…It formed in generally arid or semiarid lake environments, where the organic matter initially originated from algae and bacteria. Meanwhile, the existence of β-carotane is attributed to the algae organic matter in anoxic and saline lake facies sedimentary settings (Hall and Douglas, 1983;Jiang Zhusheng and Fowler, 1986;Irwin and Meyer, 1990;Fu Jiamo, 1990) [20][21][22] . The higher plants are thought to have some contribution to the distribution of the sterane biomarkers of source rocks.…”

Section: Discussionmentioning

confidence: 99%

High-quality hydrocarbon source rock in the Paleogene sequence of the Ping Chau Formation, Hong Kong

Yao¹

2005

Chinese Sci Bull

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Although petroleum exploration is being conducted in the Hong Kong region, high-quality hydrocarbon source rocks have never been found in this area. The Ping Chau Formation is only Mesozoic-Cenozoic sedimentary rock exposed in Hong Kong and its surrounding areas. The hydrocarbon source rock of the Ping Chau Formation is very rich in organic matters, which has an average total organic carbon (TOC) of 1.9% and chloroform bitumen "A" range from 0.14% to 0.24%. The total hydrocarbon content varies from 880 to 1800 ppm and the transformation ratio is specific from 5 to 9. The index of pyrolytic hydrogen is up to about 600 mgHC/gTOC. These data demonstrate the characteristics of the high-quality hydrocarbon source rock. The lamalginite is the major maceral of the source rock of the Ping Chau Formation, and geochemical characteristics also suggest that the organic materials of the source rock are of type I and type II 1 , with abundant gammacerane, γ, β-carotane and C 24 tetracyclic terpane, which indicate that it was formed in the salt water and brackish water sedimentary environment, and the source rock has evolved into a mature phase. The organic inclusions are found within calcite veins in cracks of the source rock, indicating that hydrocarbon has been generated and a secondary migration has happened. The source rock in the Ping Chau Formation is about 200-300 m thick, thus having considerable hydrocarbon potential. The discovery of the high quality hydrocarbon source rock in the Ping Chau Formation will certainly provide insight on hydrocarbon resource exploration in the South China Sea area.

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Lacustrine organic facies. A biomarker study using multivariate statistical analysis

Cited by 49 publications

References 20 publications

Late Palaeozoic hydrocarbon migration through the Clair field, West of Shetland, UK Atlantic margin

Late Palaeozoic hydrocarbon migration through the Clair field, West of Shetland, UK Atlantic margin

Stable isotopes of organics and inorganics, clay mineralogy and chemical environment of an Aptian lacustrine succession in northeastern Brazil

High-quality hydrocarbon source rock in the Paleogene sequence of the Ping Chau Formation, Hong Kong

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