从生物脂类化合物到沉积有机质的变化及其对正演烃源岩有机质形成的启示

王红梅; 马相如; 刘邓; 杨小芬; 李继红

Volume 32 Issue 6

Jun. 2007

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Article Navigation > Earth Science > 2007 > 32(6): 748-754

WANG Hong-mei, MA Xiang-ru, LIU Deng, YANG Xiao-fen, LI Ji-hong, 2007. Chemical Variation from Biolipids to Sedimentary Organic Matter in Modern Oceans and Its Implication to the Geobiological Evaluation of Hydrocarbon Source Rocks. Earth Science, 32(6): 748-754.

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Chemical Variation from Biolipids to Sedimentary Organic Matter in Modern Oceans and Its Implication to the Geobiological Evaluation of Hydrocarbon Source Rocks

Key Laboratory of Biogeology and Environmental Geology of Ministry of Education, China University of Geosciences, Wuhan 430074, China

Received Date: 2007-08-25
Publish Date: 2007-11-25

Abstract

Abstract

Understanding the dynamics of organic matter in marine water columns greatly favors the geobiologcal evaluation of hydrocarbon source rocks. Biolipids could make great contribution to petroleum due to their comparable chemical components and the slightly refractory characteristics of biolipids during the microbial/thermal degradation. A variety of environmental factors such as temperature, CO2 and salinity could affect the biochemical contents in microorganisms. As a result, microorganisms living in a changing environmental condition might have a different contribution to petroleum formation. Organic carbon flux shows a positive correlation with biological productivity only within a certain range of biomass volumes in a specific biohabitat. Furthermore, organic matter is degraded much more quickly in a water column with oxic conditions. Therefore the anoxic condition, along with the enhanced biological productivity, would be one of the significant factors in contributing the formation of high-quality hydrocarbon source rocks. The formation of biofilms favors the preservation of sedimentary organics by enhancing the deposition rate and decreasing the degradation rate of organics. Identification of biofilms in sedimentary rocks will thus greatly help to understand the depositional processes of organic matter finally preserved in hydrocarbon source rocks.
- modern oceans,
- primary productivity,
- biochemicals,
- biofilm,
- sedimentary organic matter,
- hydrocarbon source rocks

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