对焉耆盆地油气地质条件的认识

焉耆盆地位于南天山造山带东部,是在海西期褶皱基底上形成的中新生代沉积盆地,作为西北地区一个小型的侏罗纪含油气盆地,该盆地除与周缘的塔里木盆地、吐哈盆地有相似性外,还有自己独特的石油地质条件。指出中生代原型盆地具有张扭性断陷盆地的沉积演化特征,构造变形以“挤压、走滑和拆离滑脱”为主要特征,形成了3种独特的构造控油组合及成藏模式;三叠系、侏罗系含油气系统在南北凹陷形成了2个相对独立的油气运聚系统,其中北部凹陷存在着燕山中期和喜山晚期2次油气充注期,而南部凹陷仅发育燕山中期一次油气充注期。

IDEAS ON THE PETROLEUM GEOLOGY CONDITIONS OF YANJI BASIN

Yanji basin is located in the west of south Tianshan Orogenic Belt and is a Mesozoic-Cenozoic basin on the folded base in Hercynian period. As a small Jurassic petroleum basin in the northwest area, Yanji basin, which is similar to the surrounding basins auch as Tarim, Tuha basin, owns its peculiar petroleum geology conditions. The Mesozoic prototype basin had the depositional evolution characteristics of rension-twist faulted basin. Its structural deformation with the features of compression, strike-slip and decouping detachment developed three typical types of structure controlled petroleum suites and of hydrocarbon forming patterns. Jurassic petroleum system has two secondary relatively independent systems in the south and north sag. The system in the north sag has experienced two stages of oll and gas infilling in Middle Yanshan period and Late Himalayan period, while in the south sag, just one in Middle Yanshan period.