摘要
对泌阳凹陷碱性盐湖相、舞阳凹陷盐湖相、襄城凹陷膏盐湖相、南阳凹陷淡水湖相低熟油脂肪酸组成和分布特征进行了分析与研究。结果表明这些不同盐湖相的低熟原油的脂肪酸为丰度不同的饱和正构酸、不饱和正构酸、少量异构酸、类异戊二烯酸及脂肪酸乙酯系列化合物。脂肪酸的组成和分布反映了原始有机质的来源。
The relative high abundance and important hydrocabon generating potentiality of fatty acids in geological bodios make it necessary to investigate the composition、distrbution and presence of fatty acids in various geological bodies.The composition and distribution features of fatty acids in immature oils of diferent sedimentary environments,sach the alkaline salt lake facies in the Migang depression,Halite salt lake facies in the Wayang depression,ggpsum salt lake facies in the Xiangcheng depression and fresh water lake facies in the Nanyang depression were analysed and investigated. As a result,the fatty acids in immature oils of various salt tale depressions are compased of saturated n fatty acids,unsaturated n fatty acids,branched fatty acids,isoprenoid fatty acids and fatty acid ethyl eslers with different abundances The carbon number of fatty acids is between C 12 to C 30 major at C 16 and C 18 and the short chain homologumes are predominant with a strong even/odd predommance,The unsaturated n fatty acids are mainly composed of C 16:1 △ 9 C 18:1 △ 9 and C 18:1 △ 11 fatty acids,and the UFA/TFA values ranged between 0.013 to 0.091(average values:0.042).The branched fatty acids are composed of C 15 、C 17 iso anteiso fatty acids and C 14 ～C 21 isoprenoid fatty acids (except for C 18 ).Thes results and the low C 16 /C 18 、C 18:1 values indicate that the source materials of the immature oils are mainly bacteria、algae and the bacteriol alternated products of higher plants and aquaticorganisms.Thas,the composition and distribution features of fatty acids in immature oils can be used to explain the sources of primary organic matter in these various deperssions.On the other hand,the C 11 ～C 25 ethyl esters of fatty acids with laoer even/odd prodominance fourd in various sedimentary environments clemonstrate that the fatty acids can present as esters in geological bodies.
出处
《沉积学报》
CAS
CSCD
北大核心
1999年第1期130-135,共6页
Acta Sedimentologica Sinica
基金
国家自然科学基金
关键词
低熟油
脂肪酸
脂肪酸乙脂
盐湖相
分布特征
immature oil fatty acids ethyl ester of fatty acid salt lake facies.
