准噶尔盆地腹部油气充注与再次运移研究  

HISTORY OF HYDROCARBON-FILLING AND REMIGRATING IN HINTERLAND OF THE JUNGGAR BASIN

作　　者：邹华耀[1] 郝芳[1] 张柏桥[2] 陈斌[1] 

机构地区：[1]石油大学资源与信息学院,北京102249 [2]中国地质大学石油系,武汉430074

出　　处：《地质科学》2005年第4期499-509,共11页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家杰出青年科学基金项目(批准号:40125008)资助。

摘　　要：准噶尔盆地为一个经历多期构造运动的叠合型盆地。盆地腹部油气藏形成与演化是一个受多源、多期次油气充注与再次调整的复杂过程。采用烃源岩生烃史正演模拟与油气藏地质、地球化学反演分析相互验证的方法,表明腹部油气运聚可以分为早期、晚期和后期油气充注,即:早白垩世前的早期原油充注阶段,原油主要来自于下二叠统风城组烃源岩;晚白垩世以原油充注为主的晚期充注阶段,原油主要来源于上二叠统下乌尔禾组烃源岩;古近纪以来以天然气充注为主的后期充注阶段,天然气来自于风城组和下乌尔禾组烃源岩高过成熟阶段的产物。受喜马拉雅构造运动的影响,形成于中晚燕山期的腹部车莫古隆起发生掀斜作用,致使油气发生再次运移,调整后的腹部油气藏呈分散和小规模分布,油气藏类型由以构造圈闭为主变成以地层/岩性圈闭为主。The Junggar Basin, as a typical superimposed one, experienced multiple phase tectonic activities from the Palaeozoic. The history of hydrocarbon-filling and migrating in the hinterland of the basin were reconstructed by hydrocarbon-generating modeling combined with reservoir geochemistry analyses. The study indicated that the hydrocarbon-filling process could be roughly divided into three episodes with varied maturity oil or/and gas which originated from different source layers. The early oil-filling occurred before Late Cretaceous and sourced from the Fengcheng Formation （ the Lower Permian） , the middle period of oil-filling was during Late Cretaceous and from the Xiawuerhe Formation （ the Upper Permian） , and the last period of gas-filling came about since the Paleogene and from the over-mature Fengcheng and Xiawuerhe Formations. A giant palaeohigh, called the Che-Mo Palaeohigh which created in the hinterland of the Junggar Basin during the Yanshanian orogeny （ mainly in the end of Middle Jurassic） , was tilted by the Himalayan tectonics. Simultaneously, a large amount of hydrocarbons （mostly oil） migrated again out of the tilting structure traps in the vicinity of the Che-Mo Palaeohigh, leaving behind some sporadically-distributed stratigraphic traps with partly-filled hydrocarbons.

关 键 词：油气充注 油气再运移 成藏史 准噶尔盆地腹部 

分 类 号：TE121.1[石油与天然气工程—油气勘探]