Implications of hydrocarbons in carbonaceous metamorphic and hydrothermal ore-deposit rocks as related to the hydrolytic disproportionation of organic matter

Price, Leigh C.; DeWitt, Ed; Desborough, George A.

doi:10.3133/ofr98758

Cited by 5 publications

(9 citation statements)

References 177 publications

(229 reference statements)

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“…This result would be expected if there were low concentrations of naturally-occurring indigenous extractable organic compounds in the vein bull quartz (Price et al 1998 and1999). Given the results of Price et al (1998 and1999), and other investigators (reviewed in Price et al 1998 and1999), as well as our (yet unpublished) results regarding the analyses of many different types of high-rank crystalline rocks, the presence of small concentrations of extractable-organic compounds in hydrothermally-deposited vein quartz would be expected. Thus, we conclude that very small concentrations of organic compounds may be present in fluid inclusions in the vein quartz.…”

Section: Flint-glass Bottlementioning

confidence: 55%

“…lib). From retention times using aromatic HC standards (see Price et al, 1998;or Price and Le Fever, 1994), peak Bl is most likely toluene; peak B2 ethylbenzene; peak B3 para and meta xylene; peak B4 orthoxylene; peak B5 1,2,4-and, 1,3,4-trimethylbenzene. Peak B6 is unidentified.…”

Section: Alumina / Silica-gel Columnmentioning

confidence: 99%

“…12e), with the contaminant peaks labeled as "C" in Figure 12f. The reason for the even greater relative (apparent) decrease of contaminant peaks in the resin fraction is that, as discussed in Price et al (1998Price et al ( , 1999, the resin fraction in carbonaceous high-rank rocks is the largest of the three fractions (by weight) resulting from column chromatography. In contrast, the aromatic-HC fraction is the smallest.…”

Section: Cardboard Storage Cartonsmentioning

confidence: 99%

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Delineation of background laboratory contamination in the analysis of trace concentrations of extractable organic materials in crystalline rocks by Soxhlet extraction, column chromotography, and gas chromatography

Mimura¹,

Price²

1999

Open-File Report

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Contamination checks were carried out for sample preparation, Soxhlet extraction and the subsequent analyses of extracted bitumen, from high-grade metamorphic and igneous rocks, carbonaceous rocks from ore deposits, and other crystalline rocks. We examined possible contamination from solvents, laboratory apparatus, and from most of the analytical steps of the total procedure. The results of our examination were as follows: Once-distilled dichloromethane, twice distilled hexane, twice distilled benzene, and HPLC-grade methanol were pure enough to be used as solvents. No contaminants were leached from the septa of the cone vials used for the automated sampler on our gas chromatograph by hexane, benzene, or dichloromethane. Activated copper strips (used to remove sulfur during extraction) did not produce organic contamination by reacting with dichloromethane. However, new copper strips had to be rinsed with dichloromethane before their use, because the copper strips had a surficial wax coating from their manufacture. Saturated and aromatic hydrocarbon (HC) fractions from blank alumina/silica-gel column chromatography had only negligible peaks. Glass bottles with foil-lined caps should always be used for sample storage, because of possible wax contamination from cardboard products. Obviously, if samples are to be cut with a saw, it should be done in a pre-cleaned water-based system.We compared the saturated-and aromatic-HC and resin gas chromatograms from a mantle xenolith to those from a blank procedural check, to determine indigenous organic materials in the mantle xenolith. This comparison demonstrated that we can quantitatively and qualitatively analyze organic materials at very low concentrations (0.1 to 0.5 ppm total bitumen by weight). This comparison also demonstrated that the contaminates in the saturated-and aromatic-HC fractions are negligible. Thus, as demonstrated by the results herein, our Soxhlet extraction procedure has been optimized for analysis of small concentrations of exotic indigenous organic compounds in very high-rank crystalline rocks.

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Section: Flint-glass Bottlementioning

confidence: 55%

Section: Alumina / Silica-gel Columnmentioning

confidence: 99%

Section: Cardboard Storage Cartonsmentioning

confidence: 99%

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Delineation of background laboratory contamination in the analysis of trace concentrations of extractable organic materials in crystalline rocks by Soxhlet extraction, column chromotography, and gas chromatography

Mimura¹,

Price²

1999

Open-File Report

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“…In addition, Sugisaki and Mimura (1994) detected recycled biogenic mantle HCS in S-type granite as mentioned before, and Price et al (1998) provided new analytical data which demonstrated a surprising thermal stability of biogenically-derived C 15 + HCS in some high temperature metamorphic rocks. Considering their study results, the occurrence of some heavy HCS in the Xihuashan granite can be expected.…”

Section: Discussionmentioning

confidence: 94%

Carbonaceous material in S-type Xihuashan granite.

2001

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In order to verify the presence of residual organic matter in some S-type granites, a method used conventionally in petroleum geochemistry for isolation of kerogen was employed to separate carbonaceous material (CM) from the Xihuashan granite, Jiangxi Prov., China. Optical, XRD and SEM/EDAX analyses identified the acid-insoluble residue as mainly composed of various mineral debris, with a minor carbonaceous fraction found in the residue. LMR and micro-FTIR studies showed that the residue contained a small amount of CM, which is heterogeneous in composition and structural state. The occurrence of CM in the granite implies that this granitic magma originated from sediments and crystallized at relatively lower temperatures and high pressures. This deduction is consistent with geological and geochemical studies of the Xihuashan granite. A tentative model was suggested which connects CM in S-type granite with organic matter in sedimentary rocks. The conditions under which CM can be preserved in S-type granite are discussed. The occurrence of some heavy hydrocarbons is expected in the Xihuashan granite.gradually converted to increasingly crystalline and pure carbonaceous material (CM), with graphite as the end product.CM is a common constituent of metamorphosed sedimentary rocks. The isolation and identification of CM in metamorphic rocks are of great petrologic importance in view of the ability of graphite to control the partial pressure of oxygen in the coexisting gaseous phase (French, 1964). As the graphitization of CM in rocks is believed to be irreversible, the extent of graphitization may be a useful indicator of the maximum metamorphic grade attained (Wada et al., 1994), so that many petrologists working at metamorphism have paid attention to the chemical composition and structural state of CM in metamorphic rocks and its geological applications. On the basis of previous works (e.g., Swain et al.,

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“…The acid source is presumed to be organic acids released during kerogen diagenesis (Pitman et al, 2001), but acidity is also derived from the CO 2 released from both kerogen and pre-oil window release of CO 2 from thermal decomposition of siderite-forming carbonic acid. Immature Bakken shale was found to release large amounts of carbon dioxide under relatively low hydrous pyrolysis conditions (225-2758C [437-5278F]) (L. C. Price, 1997, personal communication;Price et al, 1998;L. Wenger, 2010, personal communication) likely from kerogen diagenesis.…”

Section: Shale-oil Playmentioning

confidence: 99%

Geochemical Assessment of Unconventional Shale Gas Resource Systems

Jarvie¹

2015

Fundamentals of Gas Shale Reservoirs

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Success in shale-gas resource systems has renewed interest in efforts to attempt to produce oil from organic-rich mudstones or juxtaposed lithofacies as reservoir rocks. The economic value of petroleum liquids is greater than that of natural gas; thus, efforts to move from gas into more liquid-rich and blackoil areas have been another United States exploration and production paradigm shift since about 2008.Shale-oil resource systems are organic-rich mudstones that have generated oil that is stored in the organic-rich mudstone intervals or migrated into juxtaposed, continuous organic-lean intervals. This definition includes not only the organic-rich mudstone or shale itself, but also those systems with juxtaposed (overlying, underlying, or interbedded) organic-lean rocks, such as carbonates. Systems such as the Bakken and Niobrara formations with juxtaposed organic-lean units to organic-rich source rocks are considered part of the same shale-oil resource system. Thus, these systems may include primary and secondary migrated oil. Oil that has undergone tertiary migration to nonjuxtaposed reservoirs is part of a petroleum system, but not a shale-oil resource system.A very basic approach for classifying shale-oil resource systems by their dominant organic and lithologic characteristics is (1) organic-rich mudstones with predominantly healed fractures, if any; (2) organic-rich mudstones with open fractures; and (3) hybrid systems with a combination of juxtaposed organic-rich and organic-lean intervals. Some overlap certainly exists among these systems, but this basic classification scheme does provide an indication of the expected range of production success given current knowledge and technologies for inducing these systems to flow petroleum.Potential producibility of oil is indicated by a simple geochemical ratio that normalizes oil content to total organic carbon (TOC) referred to as the oil saturation index (OSI). The OSI is simply an oil crossover effect described as when petroleum content exceeds more than 100 mg oil/g TOC. Absolute oil yields do 1-Part 2 Jarvie, D. M., 2012, Shale resource systems for oil and gas: Part 2 -Shale-oil resource systems, in J. A. Breyer, ed., Shale reservoirs -Giant resources for the 21st century: AAPG Memoir 97, p. 89 -119.

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Implications of hydrocarbons in carbonaceous metamorphic and hydrothermal ore-deposit rocks as related to the hydrolytic disproportionation of organic matter

Cited by 5 publications

References 177 publications

Delineation of background laboratory contamination in the analysis of trace concentrations of extractable organic materials in crystalline rocks by Soxhlet extraction, column chromotography, and gas chromatography

Delineation of background laboratory contamination in the analysis of trace concentrations of extractable organic materials in crystalline rocks by Soxhlet extraction, column chromotography, and gas chromatography

Carbonaceous material in S-type Xihuashan granite.

Geochemical Assessment of Unconventional Shale Gas Resource Systems

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