滇东罗平地区中三叠统中发现液态油苗  

Discovery of oil seepage from the Middle Triassic of Luoping area, eastern Yunnan, China

作　　者：张启跃[1] 周长勇[1] 吕涛[1] 谢韬[1] 

机构地区：[1]中国地质调查局成都地质调查中心,四川成都610082

出　　处：《地质通报》2009年第10期1526-1532,共7页Geological Bulletin of China

基　　金：中国地质调查局区域地质调查项目(编号:1212010610211)资助

摘　　要：通过1∶5万区调填图,在云南罗平地区中三叠统关岭组二段薄层泥晶灰岩中首次发现液态油苗。该稠油显示主要分布在层间晶洞中,表现为干沥青及稠油共存状态。有机地球化学研究表明,氯仿沥青"A"的含量为67×10-6,有机质类型以腐泥型Ⅰ型为主。镜质体干酪根反射率R0为2.84%,Tmax=568℃,表明有机质处于高成熟阶段。液态油苗的显示对于进一步评价南盘江盆地的油气勘探前景具有重要的价值和意义。Oil seepage was discovered for the first time from thin-bedded micritic limestone of the second member of the Guanling Formation in Luoping area through 1∶50000 regional geological mapping. Oil seepage distributes mainly in crystal caves. Coexistence of dry asphalt and thickened is observed. Organic geochemical analyses show that the contents of chloroform bitumen ＂A＂ is 67×10^-6 and sapropel-based type Ⅰ is the primary type of organic matter. The kerogen vitrinite reflectance R0 is 2.84% and Tmax = 568 ℃ indicating a higher maturity of the organic matter. The discovery of oil seepage in Luoping area is of great significance in further evaluation and exploration of oil and gas in Nanpanjiang Basin.

关 键 词：云南罗平地区 安尼期 液态油苗 生物标志物 

分 类 号：P534.51[天文地球—古生物学与地层学] P618.13[天文地球—地质学]