Organic matter from black shales collected in DSDP Holes 41-367 and 41-368@en

It is shown that microscopic algae dominate in source material of organic matter of black shales, and admixture of residues of organisms and terrestrial humic material is contained. The main direction of source material transformation during syngenesis and sedimentogenesis is associated with jellofication resulting to formation of organic matter of significantly sapropelic type. Low reflectance of vitrinite and alginite from organic matter refer to the primary and secondary lignite stages of its carbonification. Significantly sapropel type of organic matter and low stage of carbonification are reliable criteria for assigning black shales to the category of potential oil source strata.研究显示，黑色页岩（black shales）的有机质母源以显微藻类（microscopic algae）占主导，且混入生物残体与陆源腐殖质。在同生作用（syngenesis）与沉积作用（sedimentogenesis）过程中，有机质母源演化的主要路径为凝胶化作用（jellofication），最终形成具显著腐泥型特征的有机质。该有机质中的镜质体（vitrinite）与藻质体（alginite）反射率偏低，指示其碳化作用（carbonification）处于原生及次生褐煤阶段。腐泥型有机质与低碳化程度，是将黑色页岩划归为潜在油源岩（potential oil source strata）类别的可靠判据。