青藏高原昌都盆地上三叠统流体活动特征  

Characteristics of Fluid Flow of the Upper Triassic in Changdu Basin,Tibet,China

作　　者：吴悠[1] 陈红汉[1,2] 肖秋苟[3] 翟普强[1] 

机构地区：[1]中国地质大学资源学院,武汉430074 [2]中国科学研究院地质与地球物理研究所,北京100029 [3]中国石化勘探南方分公司,成都610041

出　　处：《地质科技情报》2010年第2期82-86,共5页Geological Science and Technology Information

基　　金：教育部重点科学技术研究项目(106113);中国石油化工股份有限公司南方勘探开发分公司前瞻性课题(G0800-07-ZS-82)

摘　　要：对昌都盆地上三叠统采集的25块流体包裹体样品进行了显微观察和显微测温、测盐等系统分析。显微观察结果证实了研究区古油藏的存在,同时指示晚三叠世早期存在活跃的油气运聚过程,晚期受热改造破坏而残留大量沥青。显微测温结果表明上三叠统发生过至少6幕流体充注,第1～4幕含烃流体活动明显。结合埋藏史分析可知,可能存在两期流体活动,分别发生在188.6～181.8Ma(早侏罗世中期)和174.0～157.1Ma(中侏罗世早期到晚侏罗世中期),其中第2期流体活动特征表现为连续充注的过程。25 fluid inclusion samples have been taken the Upper Triassic in Changdu Basin. These samples are investigated by microscopic observations and micro-thermometry of homogenization temperature systematically. Microscopic observations indicate that the paleo-reservoir exists in the study area with active hydrocarbon generation-migration-accumulation processes in the early stage,but these processes must have been destroyed and reliced,leaving much bitumen. Micro-thermal analysis shows that there are six episodes of thermal fluid flow in the Upper Triassic,but the hydrocarbon fluid also appears in the first to the fourth episodes. Based on the homogenization temperatures,coupled with thermal and burial histories of the sedimentary basin,two fluid flow charging stages are determined to be 188.6-181.8 Ma（the Middle Early Jurassic） and 174.0-157.1 Ma（the Early Middle Jurassic-the Middle Late Jurassic）,and the second fluid flow charging stage is a continuous process.

关 键 词：昌都盆地 上三叠统 流体活动 流体包裹体 

分 类 号：TE122.1[石油与天然气工程—油气勘探]