南方龙潭组树皮体在水介质条件下热压模拟试验  

A HYDROUS PYROLYSIS EXPERIMENT OF THE BARK BODY FROM LEPING COAL IN LONGTAN FORMATION

作　　者：沈金龙[1] 

机构地区：[1]杭州石油地质研究所

出　　处：《南方油气地质》1995年第2期34-42,7-8,共9页

基　　金："八五"国家重点科技攻关项目(85-102-12-01-02)

摘　　要：首次对二叠系乐平煤中特殊的显微组分树皮体在水介质条件下进行大样品量、系统性的成烃热压模拟实验。结果表明:树皮体是一种具有较高液态烃产率的有机显微组分,总产烃率可达到322.907kg/t有机质,其中液态烃(热解油)产率高峰达到148.671kg/t有机质。树皮体烃类(液态烃)组成具有低蜡、高芳烃、轻质油为主的特征。树皮体成烃具有多阶段性、成烃时间长的特点,尤其是焦瘦煤阶段(R_r=1.3%～2.0%)以凝析油和湿气为主,占阶段生烃量54.80%～77.7%,过成熟阶段仍能生油,占阶段生烃量25.99%。这为二叠系乐平煤成烃(特别是煤成油)机理研究和资源定量评价提供了新的理论依据和重要参数,与现代干酪根降解气一油一气的成烃模式存在明显的差别,也有别于不同显微组分的差异成烃。For the first time has been made systematically the hydrous pyrolysis experiment of bark body,which is a peculiar organic microscopic component of the Permian Leping coal,from a large number of samples.It is indicated that the bark body has a high generation rate ofj liquid hydrocarbon.Generally, 322.907kg of hydrocarbon may be generated from one ton of its organic matter,among which the liquid hydrocarbon(pyrolitic oil)could reach as high as 148.670 kg.The composition of(liquid)hydrocarbon generated from bark body is chAracteristic of low wax and high aromatic hydrocarbon in content with light oil being the main body.The hydrocarbon generation from bark body is characterized by its multistage and long duration of generation.Especially it is mainly composed of condensate and wet gas in the stage of cok- ing lean coal (R_r=1.3%～2.0%),taking 54.8%～77.7%of the total hydrocarbon amount in this stage. Oil can still be generated,being 25.09%in the overmature stage.This is evidently different from the cur- rent model of kerogen-degraded hydrocarbon generation,gas-oil-gas,and is also different from that of differential hydrocarbon generation of various microscopic components,providing a new theoretical basis and some important parameters for studying the mechanism of hydrocarbon(especially the coal-formed oil)generation and evaluating the resources in Permian Leping coal quantitatively.

关 键 词：龙潭组 煤系 树皮体 模拟试验 煤成油 热演化 

分 类 号：P618.110.2[天文地球—矿床学]