4Fowler M G,Abolins P,Douglas A G.Monocyclic alkanes in Ordo-vician organic matter[J].Organic Geochemistry,1986,10(4/6):815-823.
5Welte D H,Waples D W.Uber die Bevorzugung geradzahliger n-alkane in sedimentgesteinen[J].Die Naturwissenschaften,1973,60(11):516-517.
6DamstéS,Ten Haven,Leeuw J W,et al.Restricted utility of the pristine/phytane ratio as a palaeoenvironmental indicator[J].Nature,1987,330:641-643.
7Hanson A D,Ritts B D,Zinniker D,et al.Upper Oligocene lacus-trine source rocks and petroleum systems of the northern Qaidam basin,northwest China[J].AAPG Bulletin,2001,85(4):601-619.
8Philp R P,Fan P,Lewis C A,et al.Geochemical characteristics of oils from Chaidamu,Shanganning and Jianghan basins,China[J].Journal of Southeast Asian Earth Science,1991,5(1/4):351-358.
9Ekweozor C M,Okogun J I,Ekong D E U,et al.C 24—C 27 degraded triterpanes in Nigerian petroleum:Novel molecular markers of source/input or organic maturation[J].Journal of Geochemical Exploration,1981,15(1/3):653-662.
10Sinninghe DamstéJ S,Kenig F,Koopmans M P,et al.Evidence for gammacerane as a indicator of water column stratification[J].Geochimical et Cosmochimica Act,1995,59(9):1895-1900.
