塔里木盆地和唐山地区寒武-奥陶系碳酸盐岩差热-色谱热解气态烃特征  

Characteristics of Pyrolitic Gaseous Hydrocarbons of Cambrian-Ordovician Carbonate Rocks of Tarim Basin and Tangshan District,Determined by Differential Thermal-Gas Chromatography

作　　者：李景贵[1] 范璞[1] 崔明中[1] 李振西[1] 张柏生[1] 张谦[1] 王有孝[1] 

机构地区：[1]中国科学院兰州地质研究所,兰州730000

出　　处：《沉积学报》1997年第A12期76-76,共1页Acta Sedimentologica Sinica

基　　金：85-101-01-04课题部分研究成果

摘　　要：塔里木盆地和唐山地区寒武—奥陶系碳酸盐岩在差热-色谱550℃左右至700℃范围内热解气态烃以乙烷气体占优势,可能主要反映在此高温度点范围晶包有机质热解气态烃的加入。塔里木盆地和唐山地区寒武—奥陶系碳酸盐岩在700℃高温度点热解生烃尚未结束,仍具一定的生烃潜能,反映碳酸盐岩有机质成熟的滞后现象。差热-色谱资料还表明塔里木盆地寒武—奥陶系比唐山地区寒武—奥陶系碳酸盐岩具有较高的热演化程度。本文对研究我国高、过成熟阶段碳酸盐岩有机质生烃机理和指导碳酸盐岩地区油气勘探具有一定意义。The Differential Thermal - Gas Chromatography is a kind of pyrolitic analytic equipments which can obtain a lot of usefull information on maturity,types of source materials and potential of gas and petroleum generation from different kinds of geological samples by means of changes of pyrolitic gas compositions and total gas amounts produced during heating processes at different temperature points. In Cambrian - Ordovician carbonate rocks of Tarim Basin and Tangshan district,ethanes are the major peaks in pyrolitic gaseous hydrocarbons from 550℃or so to 700℃temperature point range,whereas in Palaeozoic mudstones of Tarim Basin,terrestrial kerogens of different periods(Permian,Jurrassic and Tertiary) of Zhungeer Basin,and two terrestrial coals with different ranks(Ro = 0.36%,2.32%respectively),methanes are the major peaks from 500℃to 600℃range.The difference in the pyrolytic gaseous hydrocarbon compositions betweennn carbonate rocks and other geological samples mentioned above is mainly caused by contributions of enclosed organic matter to pyrolitic gaseous hydrocarbons of carbonate rocks. By means of comparison with total gas amounts at different temperature points of the terrestrial kerogens of Zhungeer Basin, and coals,it is found that the Cambrian - Ordovician carbonate source rocks still have certain hydrocarbon generation potential at 700℃high temperature point,again showing contributions of enclosed organic matter in carbonate rocks to hydrocarbon generation at late stage. By means of comparison between transformation ratios[S_1/(S_1 + S_2)]from Rock - Eval and total gas amounts produced from per gram organic carbon during eleven temperature points from 100℃to 700℃,thd Cambrian - Ordovician carbonate rocks of Tarim Basin have higher maturity than those of Tangshan district,which is consistent with geological history of the two districts during Early Palaeozoic Era.

关 键 词：油气藏 油气勘探 盆地 碳酸盐岩 差热 烃 

分 类 号：P618.130.8[天文地球—矿床学]