西斜坡区萨二、三油层油气运移优势路径及对成藏的作用

分析了西斜坡区萨二、三油层油气运移输导通道的构成及特征,认为砂体是该输导层的主要通道,断裂只起油气转向、汇聚和沟通作用.根据油气运移和优势路径选取原理,在古埋深恢复的基础上,确定了西斜坡区萨二、三油层油气运移3条优势路径:齐家—古龙凹陷经白音诺勒至二站、阿拉新、平洋;齐家—古龙凹陷沿滨州铁路至富拉尔基;齐家—古龙凹陷经巴彦查干至泰来.研究了油气运移优势路径与油气藏分布之间的关系,该区萨二、三油层油气运移优势路径控制着油气藏的分布,只有位于油气运移优势路径上的圈闭才是该区萨二、三油层油气聚集成藏的有利场所.

Main oil-gas migration pathways of S2-3 oil layer in western slope zone and their effect on oil-gas accumulation

To study the main oil-gas migration pathways of S_(2-3) oil layer in western slope zone and their effect on oil-gas accumulation,the characteristics of migrating layer of S_(2-3) oil layer was analyzed.Sandbodies were considered to be the main migrating pathways of S_(2-3) oil layer,faults only played a role in changing of migration direction,accumulation and connecting sandbodies.According to the principles of oil-gas migration and choice of main oil-gas migration pathways,based on recovering of ancient depth,main oil-gas migration pathways of S_(2-3) oil layer in western slope zone in the main geological period was studied.There were there main oil-gas migration pathways of S_(2-3) oil layers in western slope zone.The first is the main oil-gas migration pathways from Qijia~Gulong Sag to Erzhan,Alaxin and Pingyang area through Baiyinnuole area.The second is the main oil-gas migration pathways from Qijia~Gulong Sag to Fulaerji area through Binzhou railroad.The third is the main oil-gas migration pathways from Qijia~Gulong Sag to Tailai area through Bayanchagan area.The intensity of the first main oil-gas migration pathways is the biggest,its oil-gas accumulation amount is the biggest,it is the main oil-gas migration pathways of S_(2-3) oil layer in western slope zone.Through the analysis of main oil-gas migration pathways of oil-gas reservoirs,the role of the main oil-gas was studied.The main oil-gas migration pathways determined the distribution of oil-gas reservoirs.Only traps located on the main oil-gas migration pathways are the places for oil-gas of S_(2-3) oil layer in western slope zone to accumulate.