西斜坡区萨二、三油层油气运移路径及其主控因素

Hydrocarbon migration route and main controlling factors of Sa 2 and 3 reservoirs in Western Slope

通过分析西斜坡区萨二、三油层油气输导通道的构成和特征,利用BasiaMod软件对其油气运移路径的分布进行了研究,得到3条西斜坡区油气运移路径:①从齐家凹陷经泰康至富拉尔基的油气运移路径;②从古龙凹陷经白音诺勒至二站、阿拉新的油气运移路径;③从古龙凹陷经巴彦查干至泰来的油气运移路径。西斜坡区萨二、三油层油气运移路径的分布主要受断层、构造脊梁和砂体分布的控制,小林克—敖古拉断层的阻挡和汇聚作用使油气向西呈3个方向运移,3条构造脊梁约束了齐家—古龙凹陷油气西运的具体路径,北西向展布的砂体为油气向西运移提供了输导空间。第2条和第3条油气运移路径及其附近应是西斜坡区油气运聚或成藏的有利地区。

This paper analyzes constitution and characteristics of conducting channel of Sa 2 and 3 reservoirs in Western Slope. It studies hydrocarbon migration distribution routes using BasiaMod software and finds 3 routes: 1) Route from Qijia Sag to Fulaerji through Taikang; 2) Route from Gulong sag to Erzhan and Alaxin through Baiyinnuole; 3) Route from Gulong to Tailai through Bayanchagan. Distribution of hydrocarbon migration routes of Sa 2 and 3 reservoirs in Western Slope are controlled by faults, structural ridges and sand body distribution. Blocking and concoursing of small Linke-Aogula fault cause 3 migration directions. 3 structural ridges restrict routes of westward migration of hydrocarbon in Qijia-Gulong Sag. NW extending sand bodies provide transmits space for westward migration of hydrocarbon. The second and third migration routes and their adjacent areas might be favorable areas for hydrocarbon migration and accumulation and reservoir forming of Western Slope.