湖滨三角洲环境的煤有机地球化学特征  

ORGANIC GEOCHEMICAL CHARACTERIZATION OF COAL FORMED IN LACUSTRINE-DEL TAIC ENVIRONMENTS

作　　者：许桂生[1] 张爱云[2] 

机构地区：[1]湘潭矿业学院,湘潭411201 [2]中国地质大学

出　　处：《地球化学》1993年第2期172-178,共7页Geochimica

摘　　要：本文对灵武煤田延安组湖滨三角州沉积进行了煤沉积学与有机地球化学的初步研究,指出上三角洲平原、过渡带、下三角洲平原等三个亚环境及不同沉积序列,其有机地球化学参数值都有所不同且有规律性。下三角洲平原煤和过渡带下部煤具备作为良好烃源岩的潜力,水进沉积序列有助于煤产烃潜量的提高。Preliminary sedimentological and organic geochemical studies of lacustrinedeltaic sedimentsof the Yan'an Formation in the Lingwu coalfield indicate that the organic geochemical para-meters are related to the oxidation-reduction conditions and plant community and vary withdepositional environments.From the upper lacustrine-delta plain to the lower lacustrine-deltaplain the content and conversion ratio of dissolved organic matter in coals tend to increase andthe n-alkanes tend to migrate toward the lighter hydrocarbou side,while the C_3-phenanthrene-content of alkylphenanthrenes and the values of I_t,I_H,D% in the pyrolysis of coal are in reas-ed.Furthermore,the type of organic matter changes from humic to sapropelic-humic in thisdirection.The organic geochemical parameters are also affected by the developing stages and the depo-sitional sequence of lacustrine delta.So the organic geochemical parameters are sensitive to thedepositional evolution,indicating that the ideal hydrocarbon source rocks are the coal seams inthe lower lacustrine-delta plain and the lower parts of the transitional zone,and that the wate-transgressive sequence is favourable to the rise of hydrocarbonproducing potential of coal.

关 键 词：沉积环境 有机地球化学 烃量 煤田 

分 类 号：P618.110.4[天文地球—矿床学]