应用牙形刺色变指标探讨鄂尔多斯西缘北段奥陶系有机质成熟度  

ON THE ORGANIC MATURITY OF THE ORDOVICIAN SYSTEM IN THE NORTHERN SECTION OF ITH WESTERN MARGIN OF THE ORDOS BASIN BY USING CONODONT COLOR ALTERED INDEX

作　　者：于芬玲 

机构地区：[1]华北石油地质局第三普查勘探大队

出　　处：《石油实验地质》1994年第2期180-184,共5页Petroleum Geology & Experiment

摘　　要：作者应用牙形刺色变指标（ＣＡＩ）对鄂尔多斯西缘北段两个构造单元的奥陶系有机质成熟度进行了研究，结果表明：盆地部位的ＣＡＩ＝３～３．５，古地温约１１５～１４０℃，有机质演化阶段为成熟至高成熟；逆冲推覆构造带通喀拉高断块的ＣＡＩ＝１．５，古地温约４３℃，有机质演化阶段尚处于未成熟。另据古生物和ＣＡＩ资料，对通喀拉高断块形成于燕山运动的认识提出质疑．In this paper,conodont color-altered index(CAI)is applied to the studies of the or-ganic maturity in the Ordovician system of the two structural units on the northern sectionof the western margin of the Ordors Basin. It is suggested that the value of CAI be 3 to3.5 in the basin with paleogeotemperature of 115 to 140℃,and the evolutionary stage oforganic matter can be attributed to mature to high-mature;while the value of CAI be 1.5in the Tonggelagao fault block in overthrusting zone with a paleogeotemperature of 43℃,and the evolutionary stage of organic matter remains unmature. Moreover,the author ofthis paper questions the validity of the statement that the Tonggelagao fault block isformed by Yanshanian movement according to paleobiological and CAI reference.

关 键 词：奥陶系 牙形刺 生物地层学 

分 类 号：P911.642[天文地球—自然地理学]