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A Study On The Organic Composition And Distribution In Surface Sediments From The Gulf Of Mexico And South China Sea

Posted on:2007-03-22Degree:DoctorType:Dissertation
Country:ChinaCandidate:C P WangFull Text:PDF
GTID:1100360185953188Subject:Institute of Geochemistry
Abstract/Summary:PDF Full Text Request
The composition, distribution of organic matter and specific biomarkers and their carbon isotopic composition in the sea floor sediments from the Gulf of Mexico where the oil and gas seeps and gas hydrate are in abundance and the South China Sea were comparatively studied in this thesis. The composition and distribution of aliphatics, aromatics, alcohols and fatty acids and their organic geochemical significance were discussed in details. This study is both theoretical and practical useful to the modern organic geochemistry and to the investigation and exploration of gas hydrate occurrence in the South China Sea. The following major conclusions can be drawn from this study:1. The contents of total organic carbon (TOC) varied form 0.20%-1.21 % in the sediment from the Gulf of Mexico. The extractable organic matter is mainly composed of aliphatic hydrocarbon, aromatic hydrocarbon and polar hydrocarbon and virtually contains no asphaltene. The sediments could be divided into two groups according to the relative abundance of hydrocarbon composition of extractable organic matter: the first group of samples shows the characteristic of typical modern organic matters as it displays an order of aliphatics < aromatics ? polar;the second group of samples is assembly the hydrocarbon composition of crude oil as it shows an order of aliphatics ? aromatics >polar. While the hydrocarbon composition of extractable organic matter in the sediments from the South China Sea is dominated by polar fraction with a content of 80%~90%, and the hydrocarbon composition displays an order of aliphatics
Keywords/Search Tags:the Gulf of Mexico and South China Sea, Sea floor sediments, the compositions and distribution of organic matter, biomarker, gas hydrate, oil & gas seepage
PDF Full Text Request
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